HP Wheelchair 4937A User's Manual
Contents
1. I AET LOSS dW yeas Y i 4 FILTER SELECT select I 4 5 19 The Line E M Signaling Types I II and Ill Originate End nfigure the HP 4937A as the Originate End proceed as follows nnect the line or lines if 4 wire under test to 310 jack A or B nnect E M leads for E M Types ll and lll connect SG SB leads also t E M toggle switch located on rear panel to desired signal type E M type must be selected ore E M is selected on front panel ing SIG SELECT key select E M signaling mode The HP 4937A will beep one two or three es to indicate the type E M selected The E M LED should be lighted ing ORIG TERM key select ORIG The ORIG LED should be lighted seize the line under test press ON OFF HOOK key ie line is seized when the LEDs indicate the following ON HK ORIG off OFF HK ORIG lighted ON HK TERM off OFF HK TERM lighted gt u can now proceed to perform one of the following Establish talk conditions Conduct transmission impairment measurements Release the line wy rey cw Ev mu aw aw ok 8 ot om omy rm rd nn ri wg ay net pre prt tr ee i EEE sed ag ad ttn tao Dar ODEI M EN Se p l ha La Co bei i Us tim 13 Us Te MODEL 4937A E M Establishing Talk Condition Je Seize the line as described in the previous section E M Signaling Types I II and il Originate End Connect lineman s hands2. SERVICE MANUAL AND PERATING 4937A TRANSMISSION IMPAIRMENT TEST SET Al Pacano Cy HP 4937A 2 EL 4937A 10D FN 4 1 eo en rn ae pr per pm Pr R mo m pom m e H i Figure 1 1 Model 4937 Transmission Impairment Measuring Set MODEL 4937A SECTION I GENERAL INFORMATION 1 1 INTRODUCTION 1 2 This Operating and Service Manual contains information required to install operate test adjust and service the Hewlett Packard Model 4937A Transmission Impairment Measuring Set Figure 1 1 shows the instrument and accessories supplied Throughout the remainder of this manual the Model 4937A will be referred to as HP 4937A or the instrument 1 3 The Manual part number is listed on the title page Also listed on the title page of this manual is a Microfiche part number This number can be used to order 4X 6 inch microfilm transparencies of the manual Each microfiche contains up to 98 photo duplicates of the manual pages The microfiche package also includes the latest Manual Changes supplement as well as pertinent Service Notes 1 4 SPECIFICATIONS 1 5 Instrument specifications are listed in table 1 1 These specifications are the performance standards or limits against which the instrument is tested Supplemental characteristics are shown in the shaded areas or in italics and are intended to provide information useful in the application of the instrument These
3. ec aoa ff step 1004 ff step Pasos tera 2 skar Hoo skiej 2630 Fae li ue jez DOWN Hz gt We SHIFT een Ise ke e ES PIE SIGNALING OT EX aD TAMT ACV ed om H H F p 2 e j li oa I NOISE 103 kHz FLAT 7 GND START a s g we 900 lo NOISE W TONE G Loos Kr O SONAL NOISE O ea is i i 1200 j NOISE GROUND SAL HI CITO 4 E i MONITOR ik ra E if if Ti RET LOSS 2W EO SAL Lo VOLUME i r orai BAG 2 A i E CJ 7 RET LOSS 4N i gt i DIAL poro a yA fi i WEAS I L FILTER WD y SG I SELECT SELECT f 19 The Line Loop Reverse Battery Terminate End H eizir mac x nfigure the HP 4937A as the Terminate End proceed as follows a A co gt nn mn mM nnect the line under test to either 310 jack A or B 60 lect SIGNALING A if the line under test is connected to 310 jack or SIGNALING B if the fine is ha Se mected to 310 jack B cor ing SIG SELECT key select Loop Reverse Battery signaling mode The LOOP REV BATTERY mn us should be lighted LEI ing ORIG TERM key select TERM The TERM LED should be lighted E a ii Us rify the following LEDs ON HK ORIG lighted OFF HK ORIG off ON HK TERM lighted OFF HK TERM off mm om seize the line under test press ON OFF HOOK key Technically the terminate end of Loop verse Battery cannot seize the line it can only respond to a
4. E and M GND START ground start k LOOP loop start A LOOP REV BATTERY loop reverse battery 3 FILTER SELECT key Selects desired weighting filter for noise measurements and the type of spectrum for return loss measurement 4 MEAS SELECT key Selects one of the following measurements Lighted LED indicates selec ted measurement x LEVEL FREQUENCY gt NOISE i NOISE W TONE noise with tone SIGNAL NOISE signal to noise E NOISE TO GROUND m RET LOSS 2W return loss 2 wire RET LOSS 4W returnioss 4 wire MODEL 4937A CONTROLS 3 15 CONTROLS CONNECTORS and INDICATORS con t 15 DIAL binding posts handset can be connected to the binding posts to dial up a line 16 SET UP switches TRMT 600 900 1200 ohms Provides terminating impedance to match the characteristic impedance of the line 150 600 1200 ohms Option 002 Provides terminating impedance to match the characteristic impedance of the line DIAL Connects the dial jack to the ine that is connected to the A or B jack This inturn con nects the DIAL jack to signaling module The dial jack is routed to the appropriate place deter mined by the signaling mode RCV 600 900 1200 ohms Provides terminating impedance to match the characteristic impedance of the line 150 800 1200 ohms Option 002 Provides terminating impedance to match the characteristic impedance of the line SRG Sets the receiver to high impedance when t
5. LEVEL i E ae sco Foo H FREGUENGY 3 C MESSAGE ic E M B EJ EE NOISE i Ta kHz FLAT 3 SND START EI ee cee taut Rev goo al 500 CD NOISE W TONE RN FFD E ne a Nais ERL 4 Ss I O SIGNAL NOISE a A ad 209 O NOISE GROUND SAL HI P ne e e EJ AET LOSS ew SAL LO fora BAG I El hade CI RET LOSS dW OIA seas j SELECT O 3 The Line Loop Reverse Battery Originate End figure the HP 4937A as the Originate End proceed as follows nect the line under test to either 310 jack A or B ct SIGNALING A if the line under test is connected to 310 jack A or SIGNALING B if the line is jected to 310 jack B ig SIG SELECT key select Loop Reverse Battery should be lighted DOWN uz EE aro HOLD EF ke 404 Pel E EE sarr 1g ORIG TERM key select ORIG The ORIG LED should be lighted ify the following LEDs ON HK ORIG lighted OFF HK ORIG off ON HK TERM lighted OFF HK TERM off seize the line under test press ON OFF HOOK key line under test is seized when the LEDs indicate the following ON HK ORIG off OFF HK ORIG lighted ON HK TERM off OFF HK TERM lighted OUTPUT I signaling mode The LOOP REV BATTERY Ea fags pra Nt ged EN JE om Con Do h 1 sete conr Ei je o LED i q i E 1 Usir l Fer pe 3 j te ma i 20 7 E MODEL 493
6. O BET Loss 2v Giske ATR C RET LOSS 48 l 5 F 1 H O Ea tn 3 Fou ng The Line Loop Start Originate End po dari o sntigure the HP 4937A as the Originate End proceed as follows a E 1 o ci aq snnect the line under test to either 310 jack A or B 4 Gi slect SIGNALING A if the line under test is connected to 310 jack A or SIGNALING B if the line Is k ted to 310 jack B Jo S nnected to jack B co i pe sing SIG SELECT key select Loop Start signaling mode The LOOP LED should be lighted R a Us sing ORIG TERM key select ORIG The ORIG LED should be lighted 3 4 Up a erify the following LEDs al y ON HK ORIG lighted oe ae a OFF HK ORIG off 4 o seize the line under test press ON OFF HOOK key I Aar erify the following LEDs fa V Xx ON HK ORIG off OFF HK ORIG lighted he line under testis seized You can now proceed to one of the following Establish talk condition Conduct transmission impairment measurements p Release the line LJ cA i mdr al ES i Establishing Talk Condition 1 2 MODEL 4937A LOOP START Seize the line as described in the previous section Loop start Originate End Connect lineman s handset butt in to DIAL jacks located on the front panel Press DIAL key OFF HK ORIG LED should be lighted and a tone should be heard on the handset The line is now ready to accept dial pulses tones or voice To perform
7. as i ad i MEASUREMENT CATA ere 106 CITO l a aa D m I pm FREQUENCY E C MESSAGE OEM ON HK ORIG 0 NOISE I kH2 FLAT ri GND START CL OFF HK CRAIG TD CTD CI NOISE W TONE i O Loop Ci ON MK TERM TITO ag si Looe REY SK By El i comme N Eo i fers E O EAL O sarten O OFF HX TERM Noise GROUND jo SAL HI SIG on OFF Y tt SELECT HOOK MONITOR if RET LOSS 2H O SAL LO VOLUME pa D H i im 0816 3 TERM hs RN FILTER oe lp DS t SELECT jf TERM i OTHER i I i O ed signal TRMT indicator will be on usually 13 dB below eceived level Is displayed in the jeft 46 iL 4937A 3 NOISE TO GROUND 1 H IG 4S37A TAANSAMISIGION IMPAIAMENT MEASURING SET p HEWLETT PAZKARD a ON ea LJ STY j J POWER i SIGNAL ING f Fe preci EI HOLO RANGE VSF E I j a A SK NE a Vang Cl SKIP HOLO Ip JE Ba H Die ee O da Di darn gt i A A A A aa piden i vg Bo TE ES A a i Iset Ue MEASUREMENT Fruer I passa IMC AT ie Sie can DET Cemessace OEM gon Hk omg CEI Cen Jeevi PR i fo 00 en TI ID i ir j H t i ric i i MO I E NOISE i 10 3 kHz FLAT 2 GND START C OFF HK ORIG BE L raut acy i goo l i goo O NOISE W TONE i coor O ON Hk TERM 55 5 i CAS i hf Cl SISNAL NOISE CI EA
8. 2 Ground start signaling 3 Loop reverse battery signaling 4 E M signaling Types I H and lll 5 Wink a W ee KV mM AN ee ENE El AR m ma i Sree ae ote A al Bek i m 9DE NEI EY 7 nua 12 13 orate ortat an be r 114 be ny MODEL 4937A GENERAL INFORMATION 1 20 OPTIONS The following options are available 1 Option 001 adds a rechargeable battery pack 2 Option 002 deletes 900 ohm and adds 150 ohm impedance 3 Option 910 includes an additional Operating and Service Manual 1 21 WARRANTY instrument warranty is as listed inside of the front cover 1 22 ACCESSORIES AVAILABLE 1 Test Cord w 310 male to alligator clips 60 ery HP P N 181824 2 Test Cord w 310 male at both ends 36 inches HP P N 15513A 3 Standard 19 inch rack mounting kit HP P N 181324 4 Ladder bracket HP P N 18181A 1 23 RECOMMENDED TEST EQUIPMENT 1 24 Equipment required to maintain the Model 4937A is listed in table 1 2 Other equipment may be substituted if it meets or exceeds the critical specifications listed in the table 1 25 BATTERY OPERATION Option 001 1 26 instruments with Option 001 have nickel cadmium batteries that enable the HP 4937A to operate from internal power when in areas where ac power is not available Typical operating time is S hours when the batteries are fully charged The batteries are trickle charged whenever the instru ment is connected to an ac power
9. 79 Mint Gray East and West 8120 1692 2 90 79 Mint Gray Europe Saudi Arabia Egypt i i i So Africa india i j iunpolarized inj many nations 125V 8120 1348 5 Straight NEMAS 15P 80 Black United States 8120 1398 5 90 80 Black Canada 8120 1754 7 Straight NEMAS 15P 36 Black Japan 100V or K S 8120 1378 i 1 i Straight NEMAS 35P 80 Jade Gray 200V I 8120 1521 1 6 90 80 Jade Gray Mexico I 8120 1676 2 Straight NEMA5 15P 36 Jade Gray Philippines i Taiwan 250V 8120 2104 3 Straight SEV1011 79 Gray Switzerland 1959 24507 Type 12 E S yp tiy 250V 8120 0698 6 Straight NEMA6 15P United States Canada og IS ES 3120 1957 2 Straight DHCK 107 i 79 Gray Denmark 8120 2956 3 909 79 Gray 8120 1860 6 Straight CEE22 VI Systems Cabinet use Part number shown for plug is industry identifier for plug only Number shown for cable is HP Part Number for compiete cable E iL 4937A ALLATION Humidity This instrument may be operated in environments with humidity from 5percent to 95 percent ve humidity at 40 degrees C 104 degrees F However the instrument should be protected temperature extremes that can cause condensation within the instrument 3 STORAGE AND SHIPMENT Environment The instrument may be stored and shipped within the following environmental limits Temperature 20 to 65 degrees C 4 to 149 degre
10. Pre Ra ME Rel 2 Rat Re ACI MODEL 4937A SPECIFICATIONS Table 1 1 Specifications con t NOISE WITH TONE Transmitter Frequency 1004 Hz fixed tone for other specifications see Transmitter Frequency Receiver Notch Filter gt 50 dB rejection from 995 to 1025 Hz Weighting Filters C message and 3 kHz flat Range 10 to 99 dBrn 600 900 and 1200 Resolution 1 db Accuracy 1 dB from 20 to 99 dBrn 3 dB from 10 to 20 dBrn SIGNAL TO NOISE RATIO Transmitter Frequency 1004 Hz fixed tone for other specifications see Level and Frequency Receiver Signal Level Range 40 to 13 dBm Ratio Range 10 to 45 dB Resolution 148 E Accuracy 1 dB HE 9 NOISE TO GROUND Transmitter quiet terminated Receiver Weighting Filters C message and 3 kHz flat Range 50 to 99 dBrn 600 900 and 1200 ohms Resolution 1 dB Accuracy 1 5 dB RETURN LOSS 2 wire 600 and 900 ohms only 600 ohms Option 002 Transmitter Level Range 26 dBm to 2 dBm Resolution 0 1 dB Transmitter Spectra Echo singing return loss low and singing return loss high spectra all meet the specifications of IEEE standard P743 and Bell System Publication 41009 4937A CATIONS Table 1 1 Specifications con t URN LOSS 2 wire con t siver je Oto 40 dB sjution 0 1 dB nal Hybrid Impedance 800 ohms 0 1 or 900 ohms 0 1 in series with 2 16 ofarads 1 Nire 600 and 90
11. pul l i OUTPUT LEVEL control adjust the transmit level to desired ievel ising DISPLAY key to view results Return loss Is shown in dB on the left display fel ress FILTER SELECT key select the remaining test as listed in step 2 Ising 15 31 og Me ae ran s FA er EK gd ae a 3 50 RETURN LOSS 4 WIRE MODEL 4937A RETURN LOSS 5 7 6 reste A EN kvm Ad res Co 49374 Tr ANNMISS ON f KASUAING SET OUTPUT LUE HemLert PACKAD re EYEL f Y R 1 De osseuar DoT i X i stay oh ist i E i i PONER ger Sie bindet i STONALING D KOLO N mem skip it ZER pe J MEASUREMENT FILTER COTTON INGA AD on A a i ate EN Pa ON Hi SIA 3 a EAEGUENCY LE C MESSAGE 0 E M CI ON RX ORIG am gt mn worse 13 kHz FLAT IC SNO START 0 OFF HK ORIG EET D i EI Le NOISE W TONE 1 1008 Ch ON HK TERM SIGNAL NOISE ent oto EV Gore rem CETO O NOISE GROUND Se NA oor D Lise ll von pare MONTON 1 RET LOSS 2H rbk ki i VOL UME i CJ RET LOSS 0 9916 Cf TEAM ZN I ante f roo Vg GJ EE Ge 1 Press MEAS SELECT key to select R 2 ET LOSS 4W 2 Press FILTER SELECT key to select one ot the following VEI e ERL echo retu rn loss middie band e SRL Hi singing return los 5 upper band e SRL LO singing return joss tow
12. source and the POWER switch is in the STBY position 1 27 Regular discharge charge cycles are recommended to maintain maximum battery capacity The instrument should be operated until the batteries are discharged when LOW BATTERY indicator is displayed in the left display then recharged at least every 30 days Normal recharge time is about 14 hours Typical battery life under normal operating conditions should be at least 100 char ge discharge cycles Note Batteries do not charge when the HP 4937A is operating from an ac source 4937A LAL INFORMATION Charging the Batteries The internal battery consists of one 15 volt rechargeable battery pack To recharge the bat connect the HP 4937A to an ac power source and press the power switch to STBY the bat will not charge with the power switch in the ON position Normal recharge time is about 14 Charging Temperature The batteries may be charged at temperatures between 5 degrees C and 40 degrees C 41 as F and 104 degrees F but will have greater charge capacity if charged between 5 ss C and 25 degrees C 41 degrees F and 77 degrees F At temperatures above 25 ss C the charge acceptance falls off as shown in figure 1 2 For example a cell charged at egrees C accepts about 60 to 70 percent of its rated capacity Temperatures below 5 s C cause pressure to build up within the cell as it is charged which could result in venting of i This can result in permanent degradation
13. team TTD hr er ae ee 3 A LOOP REV ali 7 SIGNAL NOISE ERL VE BATTERY Chore KK TEM CO ae are CoD 12004 lo worse erouno O SAL HI lif sie ON OFF N pr ser ECT Noor ra MONITOR i BAe aer Loss aw SAL LO SELECT J j j VOLUME l i 1 eal cl RET LOSS 49 ly oare TERM i DIAL O i Te i f t i f T P 1 7 j H i O ELECT Sete EM j TRANSMITTER 4 Using the MEAS SELECT key select LEVEL FREQUENCY 2 Press DISPLAY TRMT key to display the transmitted signal TRMT indicator will light Level can be read in the left display and frequency can be read in the right display 3 1f SF signaling units are used on the circuit under test press SHIFT key then RANGE HOLD key to select SF SKIP which blanks the frequency from 2450 Hz to 2750 Hz 4 Turn OUTPUT LEVEL knob to adjust the level of the transmitted signal to data level which is usually 13 dB below the transmitied level point TLP An Err 01 displayed indicates the level is gt 16 dBm An Err 02 displayed indicates the level is lt 70 dBm 5 Use the STEP UP and STEP DOWN keys to select the desired output frequency To select one of the preset frequencies 404 Hz 4004Hz 2804 Hz or 2713 Hz press the SHIFT key and then press the desired frequency key 4937A FREQUENCY Level and Frequency con t Che 4837A TRANSM SSION IMPAIRMENT MEASURING SET OUTPUT D HENLETT PACK AD E LEVEL ne E
14. transmission impairment measurements release DIAL key an internal hold coil will continue to hold the line Perform desired measurement as described in the Measurements Section Releasing The Line 1 2 Press ON OFF HOOK key and verify the following LEDS e ON HK ORIG lighted e OFF HK ORIG off Pressing the ON OFF HOOK key again will re seize the line 2 EL 49374 p P START 3 qu 49374 TRANSMISSION IMPAIRMENT MEASUAING SET EE O HEWLETT PACKARD o LEVEL ye JED ENN E 4 p i ra o 3 C dBm H 1 E None F Y O TAMT i H i BY 1 DISPLAY m REV C g8 I ll stave gan PL i o j 0 agen Jo step V pes EN pon Je AR i Le ooN 1 Jr SET Ese CA E a dg a le Hs J S pa HALO aj Fa m 3 O sap 1000 jski pil zeAo E 4 Ned f TT SET ve eae ae a ae Coz I i dene mm mm mw mw vw mw m ing The Line Loop Start Terminate End 4 TAM rov LEVEL Y FREQUENCY da i 0 MESSAGE E M E O NOISE IG Ga kmz FLAT O ono START 7 E NOISE MW TONE EX CJ ON HK TERM i i i E 0 SIGNAL NOISE OD EAL i J OFF HK TERM GOIS i E F Fil O NOISE GROUND IG SAL HI YA fear y TD 1 1 mor WINK MONITOR i C RET LOSS aw SAL La a 00 A VOLUME mn a RET LOSS aN O ff mens Y rnea aro ln O 3 ELE EEEE SELE ye y SELECT sezer OTH
15. 0 NOISE lost fat Cl sno stant CJ OFF HK ORIG TID Lut aT REV soo n 300 i i NOISE W TONE 3 1009 3 ON HK TERM ED a JESS O sreaznorse O ER gig REY nor a kat lj 1200 i NOISE GROUNO O SAL HI Fae O70 2D 1 _ i I MONT SS O net LOSS 2 E sal Lo e ep E M 56 58 DIAL anc gt i Y pet LOSS aw 1 0816 E TERM SI DIAL 06506 amp a I SELECT SELECT EG TERM amea P Gu ar en p Using Wink Signaling 1 Configure the HP 4937A to the signaling mode desired 2 Press the SHIFT key followed by the ON OFF HOOK key Note Err 30 will be both ends of the line are not in th 3 The appropriate status LED will blink rapidly This indicates the wink Wink can be disarmed by pressing any key 4 When the far end goes off hook the HP 49 transitions 5 After the digits have been received place the HP 49 ON OFF HOOK Key 6 The line is now seized and you can proceed to perform one of the e Establish talk condition e Conduct transmission impairment measurements o Release the line displayed if wink Is used with an illegal signaling mode e off hook state 37A will respond with rapid off hook and on following or if is armed and in a ready state hook 37A in the off hook state by pressing the 4937A lishing Talk Condition ze the line as described in the previous section Using Wink Signaling nn
16. 0 ohms only 600 ohms Option 002 nsmitter el Range 26 dBm to 2 dBm olution 0 1 dB nsmitter Spectra 10 singing return loss low and singing return loss high spectra all meet the cifications of EEE standard 2743 and Bell System Publication 41009 seiver age Oto 50 dB solution 0 1 dB zuracy 0 5 dB overall anshybrid Loss Compensation 29 9 dB to 29 9 dB in 0 1 dB steps y 1 la OM Ka ENE cay S o a Zi eun om com dah a es i buer m mn m m m m kid ida wat EL CIF RET Rec jadi tail Ran Resi Inter micr Tra Lev Res Tra SEG id SPE Re Rat Re Ac Tr MODEL 4937A SPECIFICATIONS Table 1 1 Specifications con t SUPERVISORY SIGNALING E M Signaling Types Type H and iti both originate and terminate Battery 48 Vde current limited to 29 mA Supervision Sensors Threshold Voltages E Lead M Lead Voltage c 16V on hook gt 18V on hook gt 16V off hook 18V off hook On Hook Off Hook On Hook Off Hook Type I Tyre II Type III Loop Signaling j Types Loop Start Ground Start and Loop Reverse Battery both originate and terminate Hold Circuits 2 each drawing 27 milllamps at a minimum voltage of 8 5 Vdc Battery 48 Vde with 340 ohms in series current limited to 29 milliamps Bridging Loss of Battery lt 0 5 dB from 200 Hz to 500 Hz lt 0 3 dB from 500 Hz to 10 KHZ WINK id
17. 2 Recommended Test Equipment Instrument Ac Calibrator Ac Voltmeter Critical Specifications Qutput imV to 10V Freq 20Hz to 4 KHz Accy 0 02 6 1 2 digit 0 1 Multimeter de current Oscilloscope Dual Chan SmV div Signature CMOS levels Analyzer Qualifer Audio Analyzer 20 Hz to 4 KHz Counter 10 kHz Power Supply 50 volt Service bracKets DIP switch Resistor 398 ohm 1 Resistor 800 ohm 1 Resistor 300 ohm 1 4djustments P Performance Test T Troubleshooting Recommended Model HP HP HP 17404 HP 39034 HP HP P N 1531 0211 HP P N 1251 7158 HP P N 9698 9100 HP P N 0698 7408 HP P N 0698 6344 MODEL 49374 SPECIFICATIONS Use y 13 r ty H MODEL 49374 INSTALLATION SECTION II INSTALLATION 2 1 INTRODUCTION 2 2 This section provides installation instructions for the Model 4937A TIMS This section also in ciudes information about initial inspection and damage claims preparation for use power require ments storage and shipment 2 3 INITIAL INSPECTION 2 4 Inspect the shipping container for damage if the shipping container or cushioning material is damaged it should be kept until the contents of the shipment have been checked for completeness and ihe instrument has been checked mechanically and electrically The contents of the shipment should be as shown in figure 1 1 The procedures for checking electrical performance are given in Sect
18. 7A LOOP REVERSE BATT 8 You can now proceed to perform one of the following e Establish talk conditions Conduct transmission impairment measurements e Release the line Establishing Talk Condition 1 Seize the line as described in the previous section Loop Reverse Battery Originate End 2 Connect lineman s handset butt in to DIAL jacks located on the front panel Note A tone will be heard immediately but the handset is not actually connected to the line until after the DIAL key is pressed 3 Press DIAL key OFF HK ORIG LED should be lighted and a tone should be heard on the handset 4 The line is now ready to accept dial pulses tones or voice 5 To perform transmission impairment measurements release DIAL key an internal hold coil will continue to hold the line 6 Perform desired measurement as described in the Measurements Section Releasing The Line 1 Press ON OFF HOOK key and verify the following LEDS ON HK ORIG lighted OFF HK ORIG off 2 Pressing the ON OFF HOOK key again will re seize the line pa 4937A ET DDE REVERSE BATT i JOP i l Mt i2 i af 10 4937A TRANSMISSION IMPAIRMENT MEASURING SET auTPUT 4 VPT nemett PACKARD LEVEL i Siene A Bi f f r i i i GN a f I F TRMT I dam I Hz y j A p i O stara UT grov ee C Clas Ne 77 A d i P a een fr i EE A A A A SEE Eee Es SIGNAL ING O moen RANGE sr Cleve
19. ANGE HOLD and SF SKIP key RANGE HOLD Prevents the autorange from changing from its present setting during a measurement SF Skip Prevents the transmitter from transmitting within 150 Hz 300 Hz band of 2600 Hz This feature eliminates accidentally being disconnected by SF signaling units on dial up lines jat Operates only in LEVEL FREQUENCY 4 LEVEL ZERO key Sets a 0 dB reference in RCV LEVEL FREQUENCY mode All subsequent measurements will be made in dB relative to this reference dB LED in center of the front panel will light A minus dB reading indicates levels higher than the reference level per ihe telephone industry convention in 4 wire return loss and RCV mode the LEVEL ZERO key enters a 0 dB return loss in the jeft dispiay and calculates the transhybrid loss THL which is displayed in the right hand display 5 STEP UP STEP DOWN lt and gt keys in TRMT Mode right display and LEVEL FREQUENCY lt or gt selects the position of digit to be increased or decreased Lighted cursor indicates one of four digit positions Digit value is incremented by pressing STEP UP and decremented by pressing STEP DOWN Pressing and holding the STEP UP or STEP DOWN key causes the action to repeat Also with the SHIFT key sets the output frequency to 404 Hz 1004 Hz 2804 Hz and 2713 Hz in LEVEL FREQUENCY mode in 4 wire return loss and RCV mode these keys are used to enter the THL of the circuit 6 OUTPUT LEVEL Cont
20. Cl Hz i Ci dBrn no EG pr 1 i PE SEEGER he STEP a STEP hr e713 lt Hz uP own lez gt SPIET Ne ee Sa anoo TRANGE sr Off GEVER GN E SBA aA E O SKIP HoLo SKIP ZERO Bl es SET yPC MEASUREMENTE LQ vea FILTER CO RING ERE E c wessase D Em Gon mK os CD i CIO i H Ek 17 3 kHz FLAT i j C GND START O OFF HK ORIG m LOOP Cl ON HK TERM on a o El ERL LOOF REV Cj QFF HK TEAM OT E BATTERY Ai C 0 0 fC SAL HI psm EN E e en O SAL 0 i VOLUME E ORIG C TEAM i H H FILTER GRIG KOLA a SELECT TERM OTHER IVER ing the MEAS SELECT key select LEVEL FREQUENCY ess DISPLAY RCV key to display the received signal RCV indicator will light Level can be read the left display 1 Err 01 displayed indicates the signal is gt 16 dBm An Err 02 displayed indicates the signal is 70 dBm yr attenuation distortion measurments press LEVEL ZERO key to set the received level at O dB subsequent level measurements will be made relative to this point Pressing the LEVEL ZERO y a second time reverts the level to absolute units dBm instead of relative units dB A nega e reading indicates levels higher than the reference level per the telephone industry convention en er T E r y no k ODEL IVEL 44 m MODEL 4937A NOISE 3 45 NOISE 1 PENNE n
21. D L CG meros am 1 3 DIAL t 1e fore aE i i i FY O i MEAS NW LET po j Oof m neo amk gt m 0 sat N A LINE FUSE 109V 120Y F37Sma 250V 220V 240V F 200mA 250V TYPE I TYPE 1f 9 O TYPE Hi CAUTION NO OPERATOR SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED PEASONNEL WARNING WARNING TO PREVENT FIRE OR FOR OPERATOR PROTECTION SHOCK HAZARD DO DURING BATTERY OPERATION NOT EXPOSE THIS UNIT CONNECT CHASSIS TERMINAL 100V 320V 220V 240V 5 10 E TO RAIN OR MOISTURE TO EARTH GROUND 48 58 Hz JOVA MAX Figure 3 1 Front and Rear Panel Controls Connectors and Indicators er T i e ad bt ed I SAN hal i tt EEE DR EE KJE ke SS TE bl A N a o MODEL 49374 CONTROLS 3 15 CONTROLS CONNECTORS and INDICATORS FRONT PANEL i Power Switch Switches power to the instrument when in the ON position In the STBY position power is still applied to some circuits If the unit has the battery Option 001 there will still be power available to some internal circuits even in STBY position and the batteries are charged in this position There are separate battery operation and low battery indicators These indicators are located in the left hand display 2 DISPLAY key Selects either the TRMT transmit or the RCV receive signal to be displayed The corresponding LED will be lighted 3 R
22. ECT CHASSIS TERMINAL 100V 120 220V 240V 5 10 TO RAIN OR MOISTURE TO EARTH GROUND 48 65 Hz JOVA MAX Figure 2 1 Line Voltage Selection Power Cabie WARNING Any interruption ot the protective grounding conductor inside or out side the instrument or disconnecting the protective earth terminal can make this instrument dangerous to electrical shock 2 This instrument is supplied with a three wire power cable When connected to an appropriate e wire ac power receptacle the cable grounds the instrument See table 2 1 for availabie fer cables 13 OPERATING ENVIRONMENT 4 Temperature 15 This instrument may be operated in temperatures from O degrees C to 55 degress C 32 jrees F to 131 degrees F Temperature range tor instruments with batteries is O degrees C to degrees C 32 degrees F to 104 degrees F a 11 2 1 thre pom 2 dec 41 MODEL 4937A INSTALLATION Table 2 1 Power Cables Available Cable Cable Plug Type HP Part D RIGG f Length p use Number escription finches olor n Country i EAST EGGE i j H 8120 1351 O Straight BS1363A 90 Mint Gray United Kingdom 8120 1703 6 30 90 Mint Gray Cyprus Nigeria i Rhodesia i j Singapore 250V 3120 1369 O Straight NZSS198 ASC112 79 Gray Australia 8120 0696 4 90 87 Gray New Zealand i Ml i I 250V 8120 1689 7 Straight CEE7 Yit
23. EJ FI PCN GMEASUREMENT eg SIGNALING OO 637373 al TAM RACV E TET ids E E ad E fa y fem eael IO C MESSAGE ered EST D De NOR REV gt 890 O NOISE 3 kHz FLAT O SND START QD en H ET ER 200 ti OE s00 i n 030 O NOISE W TONE Se p ooo 7 py L RES E H i A CI SIGNAL NDISE EAL O BATTERY CID os 2 NOTSE GROUND I SAL HI EEE QT y p MONITOR i CI RET LOSS 28 1 SAL 10 VOLUME i lo RET Loss w ma j j A MEAS FILTER o O odd ol SELECT I SELECT i sei i The Line E M Signaling Types I ll and Il Terminate End gure the HP 4937A as the Terminate End proceed as follows C d ect the line or lines if 4 wire under test to 310 jack A or B ect E M leads for E M Types ll and lll connect SG SB leads also A M toggle switch located on rear panel to desired signal type E M type must be selected e E M is selected on front panel dE D to 3 SIG SELECT key select E M signaling mode The HP 4937A will beep one two or three to indicate the type E M selected The E M LED should be lighted g ORIG TERM key select TERM The TERM LED should be lighted nn 5 eize the line under test press ON OFF HOOK key line is seized when the LEDs indicate the following IN HK ORIG lighted JFF HK ORIG off IN HK TERM lighted DFF HK TERM off ED MG NONINO Den eee en y ca
24. ER ae Se A 3 1 I oe Seizi anfigure the HP 4937A as the Terminate End proceed as follows nn ai o 9 onnect the line under test to either 310 jack A or B i i i Ci mn r K a 2lect SIGNALING A if the line under test is connected to 310 jack A or SIGNALING B if the line is nnected to 310 jack B E a nm sing SIG SELECT key select Loop Start signaling mode The LOOP LED should be lighted sing ORIG TERM key select TERM The TERM LED should be lighted mn CS eg fice battery is now provided on the line m 5 16 status LEDs indicate the condition of the far end originate of the line When the originate end ee es off hook then verify the following LEDs e dal ON HK ORIG off OFF HK ORIG lighted je m nn e line under test is seized You can now proceed to one of the following Establisn talk condition Conduct transmission impairment measurements E Release the line p MODEL 49374 LOOP START Establishing Talk Condition 1 Seize the line as described in the previous section Loop Start Terminate End 2 Connect lineman s handset butt in to DIAL jacks located on the front panel 3 Press DIAL key The HP 49374 wiil provide talk battery and will ac couple lineman s handset to the line under test 4 The line Is now ready to accept tones or voice 5 To perform transmission impairment measurements release the DIAL Key 6 Perform desired measurement as d
25. ERM off ssing the ON OFF HOOK key again will re seize the line T ld he rn mm r MODEL 4937A LOOP REVERSE BATT 3 34 LOOP REVERSE BATTERY SIGNALING 3 35 Loop reverse battery is used to signal one way trunks This is most often used in PBXs for direct inward dial DID lines Direct inward dialing permits an outside call to be dialed directly to PBX subscriber loop without operator assistance The on hook and off hook states at the ter minate end are indicated by reversing the battery polarity see figure 3 4 3 36 The term one way trunk refers to only the signaling characteristics of the trunk and not to the direction of communications The call can be initiated by only the originate end of the trunk Once the signaling is complete the trunk will carry normal two way communications The HP 4937A can be used as either the originate end outside call or the terminate end PBX o CURRENT DETECT 48V T Figure 3 4 Loop Reverse Battery Signaling hr ER dis renames A Z e 0 by PA 4937A EVERSE BATT Tho 49374 TRANSMISSION IMPAIAMENT MEASURING SET ude HEWLETT PACKARD 0 7 r A JNa er R Je TAMT LJ ao GE GS Cl ga a 0 ra A a ms es OE Ch Ba r JR Q LEVEL POWER SIGNALING FR E 8 1 SKIP a Coet ja uP LI Jr i oe TAMT a mr MEASUREMENT Lo I C ET Tren Cl RCY
26. FRAGILE to ensure careful handling n any correspondence refer to instrument by model number and ful serial number 2 17 relati irom MODEL 4937A SECTION Nil OPERATION 0 3 1 INTRODUCTION 3 2 This section contains information on front and rear panel features self check procedures and error codes It also describes typical operating modes The principles of operation of the measure ments are explained in Appendix A of this manual 3 3 OPERATING CHARACTERISTICS 3 4 The HP 4937A provides two types of functions Transmission impairment Measurements and Supervisory Signaling The transmission impairment measurements that can be made with the HP 4937A are e Level and Frequency e Noise e Noise with Tone e Signal to Noise Noise to Ground e Return Loss Signaling capabilities of the HP 4937A are Supervisory signaling simulation e Establishing talk condition for transmission testing e Ability to hold two 2 wire circuits for testing The types of supervisory signaling simulation are Loop Start e Ground Start e Loop Reverse Battery e E M signaling Types Il and iil e Wink 3 5 PANEL FEATURES 3 6 Figure 3 1 identifies the front and rear panel features and includes a brief description as to the DN function of each feature DEL 4937A FOR MESG 7 SELF CHECK 3 The HP 4937A has two types of self checks These are a power on self check and an ex ded selt check The power on self check procedure is perfo
27. HOOK pes ON HOOK J a Figure 3 8 Wink Signaling Technique The initiating end begins the process by going off hook The receiving end when ready rs with a wink The initiating end then sends the digits to the receiving end Once the receiving s received all the digits and completes the connection it ends the sequence by going off hook The HP 4937A is capable of providing Wink for E M Ground Start and Loop Reverse Battery ate The Wink times are specified in figure 3 9 The address digits sent to the HP 4937A are ored and cannot be displayed it a tO eg OFF HOOK PON ee GAGE OFF HOOK RECEIVING Las 122 ms ja 200 me END EN ET on HOOK HP 49378 Figure 3 9 Wink Times Ru o E AA A AA aut KW A A be Da A a p DORN oe ag ES Ae 24 gt JEG IK 39 10 Y _ nent ss dl MODEL 4937A WINK 2 ao 4937A TRANSMISSION IMPATAMENT MEASUAING SET P HEWLETT PACKARD A GEER ar a i gt o gag j Pa f Y O TAMT i Al O Hz ol DISPLAY acy da ET i O agren i POWER A A A A Ln AAA PERA PRA ard RANGE se ff LeveL aoa f STEP 1004 step 2004 gt E skip HOLD SKIP ZERO I ae up Hz oow He gt Sok al po yee IA EG SET PEZA EA ATA a ETT SIGNAL ING fC I CIO I A o GTO I oo ee lO raeauener PO C MESSAGE DEM 7 ON HK ORIG i E 3 j 4 ke t H re REV 200 80
28. IGNAL ING HEWLETT 6 8 G 49374 THANSNISSION IFRI iN f BRCKAN G LEVEL FREQUENCY E NOISE CJ NOISE W TONE AMENT MEASUAING SET C das 3 48 Baan ert LEVEL j 1406 7EA0 lt la DD SISNAL NOISE f 1 Press MEAS SELECT key to select RET LOSS 2W 3 kHz FLAT o eat 4 z C E M LC GND START LOOP LOOP REV BATTERY j sis i i SELECT E m ORIG M TERM o Press FILTER SELECT key to select one of the following e ERL echo return loss middle bana e SRL Hi singing return loss upper band e SRL LO singing return loss lower band 3 Connect the line under test to the A 310 jack 4 Press NOR key 5 Select TRMT and RCV impedanc loss cannot be measured at 1200 ohms 6 Press DISPLAY to select TRMT mode The HP 4937A must be in the transmit m levei Note M ur C 48 4 e ON HK ORIG C OFF HX 0816 O OM HK TERM Q OFF HK TEAM N OFF HOOK i A WINK MODEL 4937A RETURN LOSS A A STEP ooa STEP 2804 e 2713 ant up Hz DOWN Gnr Hz i rer SEE AA FILTER MEASUREMENT coo TITO SIGNAL ANO oo 63 TD io Se cee eas C MESSAGE Ca Cu aD Oo oo CTD Geo MONITOR VOLUME ode before adjusting the output e of either 600 or 900 ohms 600 ohms for Option 002 Return z I I937A a LOSS EL 4 oom URN Ob 0 49 RETURN LOSS 2 WIRE con t
29. IMPATAMENT MEASUAING SET OUTPUT N La HEWLETT PACKARD EVEL da i CO dam SS O Hz C ag m Cl agen ag TIFF EFF SIGNAL iG Ci HOLD ea SF E Jia fa pa EN so gt Jero 8 EN B J SKIP ea ie E EN EN 1 J i fa KE Je EMS agy E ER Fe vin iD rn e C MESSAGE Oem OON FR onie fro faer goe fee hee pe laura VJ LI j O NOISE 2 3 kHz FLAT 0 GNOD START J OFF HK ORIG ke f EA a i 2 Le 300 N i 300 Bee EE NOT HONE E 1008 O ON HK TERM 63370 i oe iA a 100 y LOOP REV o i ER O BATTERY D OFF HK TERM QA CD z 1500 1800 C2 TED ED 1115 RSR el Era E ale i I SAL LO i SEL Era E HONSTOA E M 86 58 DIAL iG VOLUME i Cl ORIG 0 TERM ork H i i O O rater anos Lo Ve O SELECT iL TEAM OTHER SMITTER 235 MEAS SELECT key to select NOISE W TONE sss DISPLAY TRMT RCV key to display the transmitted signal TRMT indicator will be on and 34 Hz will be in the right display just OUTPUT LEVEL control to change 1004 Hz signal to data level in left display usually 13 dB ow the transmitted level point VER ess MEAS SELECT key to select NOISE W TONE ass DISPLAY TRMT RCV key to display the received signal RCV indicator will be on 2ad dBrn in left display Note Err O7 in right display indicates the received 1004 Hz tone has dropped below 46 dBm or exceed
30. IP Figure 3 2 Loop Start Signaling 3 28 Loop start signaling is used with the circuits that monitor the status of a subscriber loop see figure 3 2 The Signaling starts with the line in an idle state When the telephone is off hook the central office detects the current flow and responds with a dial tone The dial tone is the central of fice s off hook state The HP 4937A can be either the originate end telephone or the terminate end central office Y A i LF L 4937A ODE START DOF ti if i Ke ET AN N l 3 Da i GA 4937A TAANSMISSION IMPAIRMENT MEASURING SET OUTPUT LAR HeNLETT PACKARD suger menn LEVEL E FV gg ram O dam i T Er orsPLay i oa EJ Hz O Sa Jes kn oe L j oea o ve R SA 13 NER i A A A A 5 SIGNALING KOLD ER eve is 404 Fre 10040 step ar ernal a Ver see al kes ee eet pee 0 Juni E ya O sa koo Jaca ZERO je Ge Je Lo val Hz jz ET y 03 ser Ur HEA SUREMENT ESTIRAR SIGNALING TR CTD i I f A eas C aca ey I C MESSAGE GO E M DEON MG ORIG L ST i pos l REV E 600 1 000 o morse ina mat T CI GND START wie 5 7 p 13 Ran EG C NOISE W TONE eae amis ee een Ee or toos rev C22 E a E SIGNAL NOTSE O EAL FO sarteny O off HK TERM ST i 1200 2288 O noTsE GROUND SAL HI der i LED 2 H 7 Gin oe
31. L jo peng LI OFF sk term GT OD i be iyi j j i H Fane Oksen 1 i G Q 3 14200 e ENtorsereroo CSAL HI sxe ON OFF Verne GL TD l hisse Me MONITOR FA r AET S 2H m SAL LO SELECT HOOK i H a m 56 58 porat pe dis Kl VOLUME j A Lem i 0836 C TERM H N NI i K y ON ZN i amp I omme HOLE m f A AY WY FL ters ormer O i SO A i ag pi dd i DE Sl NSMITTER ress DISPLAY TRMT key to display the transmitted signal TRMT indicator will be on ress MEAS SELECT key to select NOISE GROUND This provides a quiet termination to the IMT jack jack EIVER ground ress DISPLAY RCV key to display the received signal RCV indicator will be on Note There will be no values displayed because in this configuration the transmitter is turned off and a quiet termination is supplied to the TRMT Note For valid noise to ground measurements the test set must be properly grounded Connect the rear panel chassis ground post to a known ress MEAS SELECT key to select NOISE GROUND jse FILTER SELECT key to select the desired filter lead dBrn noise level in the left display mo y p K 10DE nn Ot j 48 3 k 3 A r E Me vid a d Ao TRA ome TI m m m m E Gi ami REC rari rw a pe aa cried ni E ka sr Sa AE re w d n Baa YY a 3 49 RETURN LOSS 2 WIRE POWER S
32. TERM The TERM LED shouid be lighted _ Verify the following LEDS ON HK ORIG lighted OFF HK ORIG off ON HK TERM lighted OFF HK TERM off To seize the line under test press ON OFF HOOK key The line under testis seized when the LEDs indicate the following ON HK ORIG off OFF HK ORIG lighted ON HK TERM off OFF HK TERM lighted MODEL 4937A GROUND START jack or SIGNALING B if the line is RT LED should be lighted my 1937A START ce JEL l JUNE an now proceed to perform one of the following stablish talk conditions F o onduct transmission impairment measurements MLG SE elease the line _ o Bo ler shing Talk Condition a Po ablis gt the line as described in the previous section Ground Start Terminate End lo Seize sect lineman s handset butt in to DIAL jacks located on the front panel pi parr ME A Sa Conr s DIAL key The HP 4937A will provide talk battery and will ac couple lineman s handset to the nder test line is now ready to accept tones or voice serform transmission impairment measurements release DIAL key wi a ra A E OO el Seen sonne em mf I om si he is G od H EEE pa br e dea lo srein vo ee orm desired measurement as gescribed in the Measurements Section i Vad EF sing The Line able as E mom mom on mm ss ON OFF HOOK key and verify the following LEDS Pre ON HK TERM lighted OFF HK T
33. cted ee Section il for procedure to select line voltage WARNING Always connect power cord to a properly grounded 3 wire power outlet Any in teruption of the protective earth grounding will cause a potential shock hazard that could result in personal injury ress POWER ON pushbutton The HP 4937A will automatically do a self check Battery Power On Option 001 only WARNING For operator protection during battery operation connect the chassis termination on the rear panel to earth ground Sconnect power cord ress POWER ON pushbutton When switching between battery and ac power cycle the POWER ishbutton from ON to STBY io ON Set Up Do not connect more than 200 Vde or 10V rms at 60Hz to the 310 jacks onnect circuit under test to the 310 jacks ess the NOR pushbutton to connect the lett 310 jack to the transmitter and the right 310 jack the receiver gt reverse the direction of the test press the REV pushbutton ess the SET UP TRMT pushbutton that corresponds to the circuit impedances on the transmit side 150 600 900 or 1200 ess the SET UP RCV pushbutton that corresponds to the circuit impedance on the receiver e 150 800 900 or 1200 19 o e sj E o oe E i JE MODEL 49374 LOOP START 3 21 SIGNALING 3 22 This section describes the signaling function of the HP 49374 and gives detailed procedures for seizing the line for testing The HP 4937A measuring circ
34. dBm to O dBm 0 1 dB elsewhere 0 2 dB Flatness referenced to 1 kHz in dB Frequency Hz 20 299 4006 9999 i3 Level dB 10 40 Distortion in dB from fundamental Note Includes harmonics spurious and background noise within a 3 dB bandwidth of 4 kHz or 4 X f whichever is greater Frequency Hz 40 106 4000 9999 Level 13 dB 10 0 40 Note At 1004 Hz 0 dBm threshold is more than 65 dB down when using a 4 kHz filter IL 4937A JFICATIONS Table 1 1 Specifcations con t aceiver equency inge 20 Hz to 9999 Hz solution 1 Hz curacy 1 0 Hz vel inge 60 to 13 dBm solution 0 1 dB curacy in dB Frequency Hz 20 20 9999 rel 3 te Receiver accuracy not specified below 500 Hz when using 150 ohm termination Instruments with option 002 te At 1004 Hz accuracy is 0 1 dB from 20 to 13 dBm ass Talk gt 78 dB isolation 4 kHz decreasing 6 dB per octave above 4 kHz programmed Functions nge Hold inhibits the autorange from changing from its present setting SSAGE CIRCUIT NOISE insmitter quiet terminated ceiver 196 O to 99 dBrn 150 ohms lower limit is 7 dB higher Option 002 instruments only solution 1 dB suracy 1 dB from 10 to 99 dBrn 2 dB from Oto 10 dBrn ighting Filters C message and 3 kHz Flat mm mm m mmmmem nm 4 mm mm T EE EE AAA be A 1 wid Ra Fr Re Le Ra Re Ac No No _ Ore i
35. ect lineman s handset putt in to DIAL jacks located on the front panel ass DIAL key OFF HK ORIG LED should be lighted and a tone should be heard on the handset e line is now ready to accept dial pulses tones or voice perform transmission impairment measurements release DIAL key an internal hold coil will tinue to hold the line rform desired measurement as described in the Measurements Section asing The Line ess ON OFF HOOK key and verify the following LEDS ON HK ORIG lighted OFF HK ORIG off essing the ON OFF HOOK Key again will re seize the line Lpo TEN e a ODE Fa o INK igs stab EE Sei Go gn Pre Th a q ee ET y Pe gr oll Sele ET f Pr Pi a j gt PI Li PET El od 3 ET ye veil Mas ewe te s rw a m rl s m p ome i Fl Fl i vert lt send mm MODEL 4937A LEVEL FREQUENCY 3 43 MEASUREMENTS 3 44 Level and Frequency 2 arenaen MEASURING set MSMISSION IMPAIRMENT MEASURING SET Cp 4937A TRA HEWLETT PA raro it l ON us hes PONER EE GR E ree 18 ll t CIMEASUREMENT I FIL Ter l g i ES ia i la C MESSAGE CION HK ORIG ion Vi 800 i FREQUENCY Ki P pry ej iL 15 NOTSE de 3 kHz FLAT a no START O OFF HK ORIG CD Se al I aco o norse w TONE LOOP don uk
36. ed 16 dBm mo mn m m nm T i am ia A DEL er 454 yy OSE 46 a oat i i 7 z g1 sil reat a gi RAN Pre Pre 410 nw 2 om gt a bel y E a a E AIRE O rn oO ES rw a8 w 3 47 SIGNAL TO NOISE fe SISNALING toner TAMT AA RCY 6 Lear ee 4937A TRANSAI HOLD a 8 02 Fel x OG 2 HEWLETT PAA ARD 3 rm y rm 2 o o ne o o uo vi r im lin SET BANGE he HOLD MT SION IMPAIRMENT MEASURING SET SKIP ACY TRANSMITTER LEVEL ZERO j ce O dam O da 3 darn EF 1 Press MEAS SELECT key to select SIGNAL NOISE 2 Press DISPLAY TRMT to display the transmitt 3 Adjust OUTPUT LEVEL control to the transmitted level point RECEIVER 1 Press MEAS SELECT key to select SIGNAL NOISE 2 Press DISPLAY RCV to display t 3 Read the signal to noise ratio as dB in the right display Ther display Err O7 indicates the re A STEP El step up ez 20NN change the 1004 Hz signal to data level he received signal RCV indicator will be on Note dBm or exceeded 16 dBm ceived 1004Hz tone has dropped below an a 2004 gt 27 13 ea eanet MODEL 4937A NOISE 3 me QUTPUT LEVEL 1 a 3 Rz
37. er band 3 Connect the 4 wire circuit to the transmit and receive jacks 4 Select TRMT and RCV impedanc e of either 600 or 900 ohms 600 ohms for ption 002 Return I ALTA ASOT ALTE NT etpar loss cannot be measured at 1200 ohms 5 Press DISPLAY key to select TRMT mode Note The HP 4937A must be in the transmit mode before adjusting the output ievel 6 Using OUTPUT LEVEL control adjust the transmit level to desired level 7 Press DISPLAY key to select RCV mode
38. es F Humidity Up to 90 Relative at 65 degrees C 149 degrees F 1 Packaging 2 Tagging for Service If the instrument is being returned to Hewlett Packard for service se complete one of the blue repair tags located at the back of this manua and attach it to the ument 3 Original Packaging Containers and materials identical to those used in factory packaging are table through Hewlett Packard sales and support offices if the instrument is being returned for sicing attach a tag indicating the type of service required return address model number and full ai number Also mark the container FRAGILE to ensure careful handling In any correspondence ir to the instrument by model number and full serial number 4 Other Packaging The following general instructions should be used for repacking with com ically available materials Vrap the instrument in heavy paper or plastic If shipping to Hewlett Packard office or service enter attach a tag indicating type of service required return address model number and full serial umber Use strong shipping container A double walied carton made of 350 pound test material is dequate jse a layer of shock absorbing material 70 to 100 mm 3 to 4 inches thick around all sides ot he instrument to provide firm cushioning and to prevent movement inside the container Protect the ontrol panel with cardboard Seal the shipping container securely Mark shipping container
39. escribed in the Measurements Section Releasing The Line 1 Loop start terminate always provides office battery To remove battsry use SIG SELECT Key to turn off signaling 4937A iD START GROUND START SIGNALING Ground start signaling is commoniy used on trunk lines between PBX and a central office ix is usually the originate end and the central office is the terminate end Either end can seize nk by providing a current path to ground When both ends are off hook the line looks very to Loop Start signaling The HP 4937A can function as either the originate end PBX or the terminate end central of As the originate end the HP 4937A begins the loop closure by grounding the ring goes off losing S 1 which causes a current to fiow through the line see figure 3 3 S1 A RIN i 3 53 48V dl CURRENT DETECT 48V uii Figure 3 3 Ground Start Signaling Circuit The terminate equipment senses this current flow and interprets it as a request for the trunk srminate equipment acknowledges the request by grounding the tip goes off hook closing S 2 if the line This causes a current to flow through the tip side of the line from the originate end terminate end The HP 4937A will recognize the current through the tip side of the circuit and will remove the d from the ring opening S 1 remove the 48 volts from the tip and at the same time place soil current sink between tip and ring clo
40. et butt in to DIAL jacks l cated on the front panel Select SIGNALING A if the line under test is connected to 310 jack or to SIGNALING B if connec ted to 310 jack B Press DIAL key The HP 4937A will provide talk battery to the linemen s handset Tones and voice will be coupled to the line under test Dial pulses will be connected to the M lead The line is now ready to accept dial pulses tones or voice To perform transmission impairment measurements release DIAL key Perform desired measurement as described in the Measurements Section Releasing The Line 2 Press ON OFF HOOK key and verity the following LEDS e ON HK TERM lighted e OFF HK TERM off Pressing the ON OFF HOOK key again will re seize the line KJE 0 i z i i f at vir 937A ta e i La gt sowed i reyi TR i pr A _ oa ae J 4937A TRANSMISSION IMPAIRMENT MEASURING SET OUTPUT o e FL REXLETT PACKARD ert LEVEL l m on tee dm ie ZN I KG ON am i MT i iz a je i iad Q acy ala Oa 0 O j qa de AA ond T he j Dagen i j NSA 4 ete I z n i C O aa i 4 E y NER A A A A b SS EA AS ee TN as SIGNAL ING O noro f mance Var f vever fl aos ff STEP 4004 step Jesos ama gt ETR f lt ly aana gt SHIFT Eo CA g Ju 0 ski too skIP zero l jnz UP uz i DOWN Ha mb JE PA i Pita ee Numa a f
41. he HP 4937A is bridging the circuit under test instead of terminating the line 17 E M and SB SG Jacks These jacks are used for E M type signaling For the three different types of E M signaling Type I i amp ID the appropriate connections are made to the two jacks Selection of the three types of E M signaling is made using a switch on the rear panel 18 NOR and REV switches The NOR switch connects the A 310 jack to the transmitter and the B 310 jack to the receiver The REV switch connects the A 310 jack to the receiver and the B 310 jack to the transmitter When the NOR and REV switches are either both out or both pressed in the transmitter and receiver are internally looped 19 A and B SIGNALING switches The A switch connects the A 310 jack to the loop signaling module and an auxillary hold circuit is available on the B 310 jack The B switch connects the B 310 jack to the loop signaling module and moves the auxillary hold circuit to the A jack REAR PANEL 1 GROUND Jack Used to connect the HP 4937A to earth ground 2 E M SELECTION Switch Used to select one of the three types of E M signaling An audible beep denotes which type of signaling was selected with a corresponding 1 2 or 3 beeps 3 Voltage Select Allows selection of proper line voltage zL 4937A TROLS 6 OPERATING INSTRUCTIONS POWER ON AND SET UP Ac Power On sonnect power cord to the rear line module on which the correct line voltage has been sele
42. ie 100 msec nominal Off Hook 200 msec nominal Status indication of on Hook and off Hook for both originate and terminate ends of the trunk except Loop Start which only indicates originate end IL 4937A IFICATIONS Table 1 1 Specifications cont ENERAL aximum DC Blocking 200 Volts pedances 600 900 and 1200 ohms BRIDGE TRMT and RCV impedances independently Jectable idging Loss to 10 kHz lt 0 2 dB ceiver Return Loss gt 30 dB from 50 Hz to 4 kHz at 600 900 and 1200 ohms gt 30 dB from 800 Hz to 10 kHz at 150 ohms option 002 ngitudinal Balance gt 80 dB at 60 Hz gt 70 dB at 540 Hz gt 60 dB up to 4 kHz decreasing 6 dB per octave to 10 kHz wer Requirements 100 V 120 V 220 V and 240 Vac 5 10 48 66 Hz ittery Supply option Typically gt 5 0 hours of continuous operation at 25C Complete recharging in 14 hours with unit in STB Y amperature Range OC to 55 C 32 F to 131F OC to 40C with batteries 32 F to 110 F arm up time 20 C for stated accuracy 5 minutes mensions 279 mm x 127 mmx 281mm Sin x tiin x 154n eight 5 3kg 12 lbs 7 6kg 17 lbs with batteries 3tions 001 Adds rechargeable battery pack 002 Deletes S00 ohm impedance and adds 150 ohm impedance 910 Includes extra Operating and Service Manual XV E E E A ET q ME E OA e er ios AE AAA OS e CA TO O RA al v 23 z ol mm O DB Le Be iS Di oa 10 Table 1
43. ine is ND 3 Using SIG SELECT key select Ground Start signaling mode The GND START LED should be lighted 4 Using ORIG TERM key select ORIG The ORIG LED should be lighted 5 Verity the following LEDS e ON HK ORIG lighted e OFF HK ORIG off e ON HK TERM lighted a OFF HK TERM off E 8 To seize the line under test press ON OFF HOOK key 7 The line under test IS seized when the LEDs indicate the following ON HK ORIG off e OFF HK ORIG lighted e ONHK TERM off OFF HK TERM lighted 4937A ID START can now proceed to perform one of the following stablish talk conditions sonduct transmission impairment measurements Release the line lishing Talk Condition ze the line as described in the previous section Ground Start Originate End nnect lineman s handset butt in to DIAL jacks located on the front panel ass DIAL key OFF HK ORIG LED should be lighted and a tone should be heard in the handset ren the terminate end responds by going ott hook the line is ready to accept dial pulses tones voice perform transmission impairment measurements release DIAL Key an internal hold coil will ntinue to hold the line srform desired measurement as described in the Measurements Section asing The Line ress ON OFF HOOK key and verity the following LEDS e ON HK ORIG lighted e OFF HK ORIG off ressing the ON OFF HOOK key again will re seize the line 16 e Ve mme yf me am
44. ion IV If the contents are incomplete if there is mechanical damage or defect or if the instru ment does not pass the performance tests notify the nearest Hewlett Packard sales and suppurt of tice If the shipping container is damaged or the cushioning material shows signs of stress notify the carrier as well as the Hewlett Packard sales and support office 2 5 PREPARATION FOR USE CAUTION Before connecting this instrument to an ac power source be sure that the rear panel line module is set to the same voltage as the ac source and that the correct fuse for that ac voltage is installed 2 6 Power Requirements 2 7 This instrurnent requires a power source of 100 120 220 or 240 Vac 5 or 10 Single phase 48 to 66 Hz 2 8 Option 001 instruments have a battery power supply The battery pack provides up to 5 hours of continuous operation at 25 degrees C Complete recharging in 14 hours with unit in STBY mode 2 9 Line Voltage Selection 2 10 Figure 2 1 provides instruction for line voltage and fuse selection The line voltage selection and fuse are factory set for 120 Vac operation 4937A LLATION LINE FUSE A 1OOV 120v F37SmA 250V 220V 240V F 200mA 250V E M TYPE I TYPE Il TYPE Hi CAUTION NO OPERATOR SEAVICEASLE PARTS INSIDE REFER SERVICING TO QUALIFIED PERSONNEL WARNING WARNING TO PREVENT FIRE OR FOR OPERATOR PROTECTION SHOCK HAZARD DO DURING BATTERY OPERATION NOT EXPOSE THIS UNIT CONN
45. isted on the title page or in the I Changes supplement contact your nearest Hewlett Packard sales office DESCRIPTION The HP 4937A is a voice band Transmission impairment Measurement Set that also incor as signaling capability These features combined with the instruments light weight provides a sje field service tool for fast accurate network access testing The HP 4937A signaling feature used to verify the proper installation of PBX systems The transmission impairment measurements that can be made using the HP 4937A are listed low l be Level and Frequency gt Noise 3 Noise with Tone t Signal to Noise 3 Noise to Ground 3 Return Loss _ The procedures for using supervisory signaling and for making the transmission impairment urements are described in Section Ill of this manual Supervisory signaling is used to detect or change the state or condition of a subscriber or ork line There are two supervisory conditions on hook and off hook The on hook condition en the telephone is idie Thatis the handset is resting on the cradie and the grounding switch is _Off hook condition is when the telephone is active That is when the handset is removed from radle and the grounding switch is closed These on hook and off hook conditions provide circuit indications such as circuit idle circuit seizure and disconnect The HP 4937A can perform the following supervisory signaling functions 1 Loop start signaling
46. ition E M Types i and lea sense ground SG and sense battery SB leads to improve signaling pertormance see KE Tee s 3 5 3 6 and 3 7 gure FT CURRENT e pe E DETECT a AO 48V E 3 P t ORIGINATE TERMINATE i i NER Ede Figure 3 5 E M Type I Signaling 0 a wf 2 ul rm ne ORIGINATE TERMINATE 1N Figure 3 8 E M Type II Signaling mo m E m EN A EJ 48V SG CURRENT DETECT 4 SB 49y gt ORIGINATE TERMINATE Figure 3 7 E M Type ill Signaling MODEL 4937A E M 4937A 0 49374 TRANSMISSION IMPAIRMENT MEASURING SET OUTPUT HEWLETT PACKARD on LEVEL r J Q Daem i aw i ON es TAMT Ore stava PAI o aov DdB os eaae Cl arn a nd POWER A A A A rr En a meer p re A AA O SIGNALING O Hao f RANGE USF LEVEL aoa step iaooalf STEP 2804 2743 f ES ca p lt gt E VE gd i gt SHIFT A B O sxre I HOLO sie ZERO 4 sz i up fine H gown Hz ho Cua set UA en TIMEA SUREMENT C een Pra CA PI I SNA Ins OTTO 1 ME i i i TAMT acy LEVEL i Ker Fa Al mym iD pr ae C MESSAGE lo ESR 3 i H i F ree mv Oy ae Corse lia kHz FLAT fU GND START i i f f NOISE W TONE Lace LOOP REV EJ SIGNAL NOISE O ERL SATTERN t Lrrur RE O O NOISE GROUND lg sat HI J RET LOSS ae lo SAL LO i
47. me m vn sine ie LEREN mom mom m keno 2 Ke ot oe Pre Wt or Te co A PE A e mom 4937A TRANSMISSION IMPAIRMENT MEASURING SET DUTPUT A HEWLETT PACKARD LEVEL forge a SR a 5 Na Cor Sr 3 TAMT E a JH stay O acy Go orde ten eldst 3 darn eo eee i i 4 POKER vr A A area A A LES O O FE FEE 13 HOLD RANGE Ver f LEVEL aa ster 1004 EAS oa Lal oske HOLD Sel zero lt lez ve Jr DOWN Hz gt Vaz sier ser MEANS ES T FILTER OO I SIGNALING To SYD TAMT ar ACY y LEVEL O C MESSAGE O E M 3 acts Ti H a a 2 H an dk A i E M E OAS I eoo 800 FREQUENCY i i o oer 003 kHz FLAT So H 1 H 300 soa O norse H TONE ei ERR f KE HI tji e O SIGNAL NOISE O EAL EG KD ads 2200 NOISE GROUNO SAL HI CT g Ret LOSS 2H AL LO i prak BAG 157 eS i So er Ag RET LOSS AN y y DIAL A Z O O ser seer I SELECT SELECT Seizing The Line Ground Start Terminate End To configure the HP 4937A as the Terminate End proceed as follows de 2 Connect the line under test to either 310 jack A or B Select SIGNALING A if the line under testis connected to 310 connected to 310 jack B _ Using SIG SELECT key select Ground Start signaling mode The GND STA Using ORIG TERM key select
48. n now proceed to perform one of the following 1 TT oO wi lA stablish talk conditions onduct transmission impairment measurements Release the line MODEL 4937A E M Establishing Talk Candition 1 Seize the line as described in the previous section E M Signaling Types ll and ill Treminate End 2 Connect lineman s handset butt in to DIAL jacks located on the front panel 3 Select SIGNALING A if the line under testis connected to 310 jack A or to SIGNALING B if connec ted to 310 jack B 4 Press DIAL key The HP 4937A will provide talk battery to the linemen s handset Tones and voice will be coupled to the line under test Dial puises will be connected to the E lead 5 The line is now ready to accept dial pulses tones or voice 6 To perform transmission impairment measurements release DIAL key 7 Perform desired measurement as described in the Measurements Section Releasing The Line 1 Press ON OFF HOOK key and verify the following LEDS e ON HK TERM lighted OFF HK TERM off o Pressing the ON OFF HOOK key again will re seize the line SFe pl tos a 4937A WINK vink is a signaling technique used to pass address information down a trunk line lt is a ary on hook to off hook to on hook transition that signals the far end to begin sending ad gits see figure 3 8 DIGITS OFF HOOK SENT AULA ON HOOK md LJ END INITIATING CALL ESTABLISHED CALL re WINK OFF
49. ne is sounded for about 100 msec then the relay is reset This is done for each relay in se at about a 2 Hz rate if the relay is not heard on both ends of the tone it will be noticable to Since this test relies on the operator to actually detect a missing relay closure the test be stop on a failure The operator must count the relays and note the number Ei 6 HEWLETT PACKARD Set ee ER LEVEL i e ar i iD dam i Ve Nye fe SN a OY i Dd ie amp i il istava I il g acy i i i Ga A S me nt O dgrn i il POWER 7 ir 1404 A LE Eg a mm t for prs fred N EN REN pA G KOLD f RANGE SF f Lever f es STEP 004 ff STEP 2804 2713 E gt AAN Fal oser HOLD SKIP TEAQ j fer LP JOWN liuz gt d li j i Ay B o OSPF t Co VER Le Esi Saag A SET UP CT MEASUBEMENTIT FLIER SIGNALING Co A GE pa TT oD i CAMT acy i LEVEL bal j p Ji MT JE Cj o MESSAGE In em 3 ON MK OATG MEMO ooo li sold myrer oak CD ji I 2 NOISE 0 3 kez FLAT Cl GNO START O OFF HK DAIS y i i i i Ot NOZ y GNE E H H 2 2 i n i 800 E Ci NOISE w TGNE E i he i Pl i D SIGNAL NOISE IG SAL CEID i ad otro bo i 4 I saooil Ha2000 I ie nOISE GROUND O SAL H led i i pi NJISE GROUND LE SAL HI i I Ret LOSS ew I SAL LO pla i BRG 1 i i E
50. nn do 4937A TRANSAIS STON IMPAIAMENT MEASURING SET OUTPUT Yi HEWLETT PAKAR j eee LEVEL am ET e C dsm g om IN LU seta O aB g i PG Do ACA ab C 9 NY PONER l NE E e SIGNAL ING i a A foe Gee SERE dl A w SET UP MEASUREMENT raven SIGNAL ING CTET LE aat REV E E f gt ETT EI serte Don Hi ED i o0 F Sencquency e I C MESSAGE O E JON HK ORIG i en BEN al le f RTE 03 kHz FLAT lo GNO START 0 OFF HK ORIG ID f i bragt RE ij i Looe C ON HK TERM ry R a09 LOOP REV Al CTD y i Sy i 0et GET EI ET TD O Ke Ji j osm HI sie ON OFF CTO MES book VINK MONITOR 36 58 prat Eee 9 VOLUME u i C ORIG TERM i pi TRANSMITTER A 1 Press DISPLAY TRMT key to dispiay the transmitted signal TRMT indicator wili light 9 2 Press MEAS SELECT key to select NOISE Note There will be no values displayed because in this configuration the transmitter is turned off anda quiet termination is supplied to the TRMT jack RECEIVER 1 Press DISPLAY RCV key to display the received signal RCV indicator will light 2 Press MEAS SELECT key to select NOISE 3 Press FILTER key and select the desired filter 4 Read the dBrn noise ievel in the left display An Err 02 in the left display indicates underrange lt 0 dBrn Ws 4937A NOISE WITH TONE 2 3 Cp 4937A TRANSM SSLON
51. of 48 volt supply Err 55 The TIPPOS detector did not pass the test to detect the absence of the 48 volt supply Err 56 The TIPNEG detector did not pass the test to detect the presense of 48 volt supply Err 57 The TIPNEG detector did not pass the test to detect the absence of the 48 volt supply Err 58 The GNDCUR detector did not pass the test to detect the presense of current from the 48 volt supply Err 59 The GNDCUR detector did not pass the test to detect the absence of current from the 48 volt supply Err 80 The TERMCUR detector did not pass the test to detect the presense of current from the 48 volt supply Err 61 The TERMCUR detector did not pass the test to detect the absence of current from the 48 volt supply Err 62 The E lead detector did not sense the presence of the M lead The E M jack must be con nected to the SB SG jack to pass this test Err 63 The E lead detector did not sense the absence of the M lead The E M jack must be connec ted to the SB SG jack to pass this test Err 64 The M lead detector did not sense the presence of the E lead The E M jack must be con nected to the SB SG jack to pass this test Err 65 The M lead detector did not sense the absence of the E lead The E M jack must be connec ted to the SB SG jack to pass this test ne diw tent en dt ad AS Gr A a m amme mr 0 4937A OLS he Relay Step Check is the last extended self check to be done In this check each relay is s
52. of the battery capacity due to loss of electrolyte Operating Temperature Normal operating temperature of the HP 4937A with batteries should be between O degrees C 40 degrees C 32 degrees F and 104 degrees F However there will be a loss of capacity operating at the extremes At low temperatures the batteries cannot fully discharge even h they were fully charged at room temperature At high temperatures the same effect takes but to a lesser degree in addition to charge acceptance previously mentioned Figure 1 2 il tes this effect mh Q O 100 EFFICIENCY 5 C 25 C LINE gt o Q o o 0 STATE OF CHARGE N a OF NOMINAL 25 C CAPACITY x 0 40 80 120 160 200 CHARGE INPUT OF NOMINAL CAPACITY 0 10 CHARGE RATE O Dene 0 2 4 6 8 10 12 14 16 18 20 CHARGING TIME IN HOURS 0 10 CHARGE RATE Figure 1 2 Charge Acceptance at Various Temperatures DDEL NEF 28 129 ries ries aurs 30 231 agrei grei gre 45 d egret Boe 32 33 nd hen Tougi lace stra MODEL 4937A SPECIFICATIONS Table 1 1 Specifications LEVEL FREQUENCY Transmitter Frequency Range 20 Hz to 9999 Hz Resolution 1 Hz Accuracy 0 005 of output frequency Preprogrammed functions SF Skip skips the frequency band from 2450 2750 Hz Frequencies at power up 404 Hz 1004 Hz 2804 Hz and 2713 Hz Level Range 40 to 13 dBm Resolution 0 1 dB Accuracy 1004 Hz 19
53. request for seizure from the ginate end pe Do T e line under test is seized when the LEDs indicate the following i Th ON HK ORIG off E a OFF HK ORIG lighted ON HK TEAM off P a OFF HK TERM lighted ka 22 fe MODEL 4937A LOOP REVERSE BATT 8 You can now proceed to perform one of the following e Establish talk conditions es Conduct transmission impairment measurements es Release the line Establishing Talk Condition 1 Seize the line as described in the previous section Loop Reverse Battery Terminate End 2 Connect lineman s handset butt in to DIAL jacks located on the front panel 3 Press DIAL key The HP 4937A will provide talk battery and will ac couple lineman s handset to the line under test 4 The line is now ready to accept tones or voice 5 To perform transmission impairment measurements release DIAL key 6 Perform desired measurement as described in the Measurements Section Releasing The Line 0 Press ON OFF HOOK key and verify the following LEDS 9 ON HK TERM lighted e OFF HK TERM off 2 Pressing the ON OFF HOOK key again will re seize the line 00 L 4937A JODE IM Fo w E M SIGNALING 4 37 E M signaling is used primarily to signal the internal switching of the PBX or shorthaul trunks A 238 sen two PBXs E M signaling uses a separate wire pair to send signaling information E lead and etwe 4 from the pair used to send voiceband information tip and ring In add
54. rmed automatically at power up by instrument It checks most of the major circuits and should identify major problems The error ssage table listed below indicates which tests are in power on self check and which are in ex ided self check To perform the extended selt check externally jumper the E M jack and the SB jack together and then press the SHIFT key and the FILTER select key Failure of the instru nt to pass any self check procedure indicates a malfunction that can possibly affect other asurements 9 ERROR MESSAGES 10 The HP 4937A gives two types of error messages The two types of messages are either a netional error in one of the self check modes or an operational error The errors are listed below 11 Operational Errors r 01 This error indicates that the receive level is greater than the upper limit tor the selected measurement rr O2 indicates that the receive level is under the lower limit for the selected measurement rr 07 This error signifies the loss of the 1004 Hz hold tone rr 09 indicates that the level measurement currently being made needs to auto range and the Range Hold mode is set rr 10 Indicates that 1200 ohms impedance is selected in two wire return loss Only 800 ohms an 900 ohms are available frr 30 Wink is illegal setup for Loop Start and Loop Reverse Battery Originate irr 31 In Loop Originate the incomming battery has negative on the tip 3 12 Power On Self Check Errors
55. rol Adjusts the transmitter output level continously from 40 dBm to 13 dBm Output levelis displayed on the left display 7 SHIFT key Used to activate any of the functions labeled in blue 8 MONITOR VOLUME Control and Speaker Permits adjustable volume for listening to the circuit under test or to the Test Set Transmitter NY EL 4937A TROLS MOD SON 5 CONTROLS CONNECTORS and INDICATORS con t 3 3 1 ON OFF HOOK key When the instrument is selected to be the ORIGINATE end the ON OFF HOOK key simulates the on hook or off hook condition of the originate end When the instru ment is the TERMINATE end the ON OFF HOOK key simulates the on hook or off hook condition of the terminate end may co STATUS LEDs There are four status LEDs that indicate the status of both the originate and terminating ends of the line The status lights are ON HK ORIG on hook originate OFF HK ORIG Coff hook originate ON HK TERM on hook terminate OFF HK TERM off hook terminate 5 HOLD OTHER Puts an auxillary hold circuit on the B jack if the A signaling key is pressed The auxillary hold circuit willbe placed on the A jack if the B signaling key is pressed used to seize a second 2 wire circuit for testing 1 ORIG TERM key Selects whether the type of signaling is originate or terminate m NM mm wm mm mm Ww 2 SIG SELECT key Selects one of the following signaling modes Lighted LED indicates selected signaling o E M
56. rr 11 Indicates that the power up self test failed the ROM checksum Err 12 indicates that the power up selt test failed the RAM check Err 13 The magnitude of the cal level for the voltage to frequency converter is out of range Err 14 Power up self check failed to measure a frequency of 1004 Hz Err 15 Measurement of the hold tone frequency is not 1004 Hz Err 16 Power up self check failed to measure a proper level of 13 0 dBm Err 17 Level measured through the C message filter is not the proper amplitude 3 2 MO ER i 3 i ten the ter Er El MODEL 4937A ERROR MESG Err 18 Level measured through the 3 kHz flat filter is not the proper amplitude Err 19 Level measured through the 80 Hz reject filter is not the proper amplitude Err 20 Level measured through the QRMS detector is not the proper amplitude Err 21 Level measured through the Return Loss detector is not the proper amplitude 3 13 Extended Self Check Errors Err 50 Level of the Echo return loss waveform is not the proper amplitude Err 51 Level of the Singing High return loss waveform is not the proper amplitude Err 52 Level of the Singing Lo return loss waveform is not the proper amplitude Err 53 The measured depth of the notch filter is too small This test will fail if the level is too low The transmit level must be greater than 40 dBm to pass this test Err 54 The TIPPOS detector did not pass the test to detect the presense
57. sing S 3 causing the current to flow from the ter 2 equipment to the HP 4937A and back to the terminate equipment The loop is now closed 3d and the terminate equipment responds with a dial tone 32 je te ide c o the 33 roun Hd nats Seize 3 14 MODEL 4937A GROUND START IIA ee i Thy 43372 TRANSMISSION IMPAIRMENT MEASURING SET N Ai HENLETT PACKARD SUTPUT APA LEVEL none O TAMT O din cr uni i E i o acy O dB bw M2 Garn 024 vere te EE A A A fi HOLD I N Y AN AAA AR i ry site ae Ise pen lt var eae ae bom rn j Lad S t t jne YP Hz DONN 1142 ptset eo MEASUREMENT FILTER TTD rena ins i I TAMT ACY i LEVEL pee VI ao FREQUENCY C C MESSAGE E E M EEO ET q as norse O 3 kHz FLAT E H cer goo A 900 C NOISE W TONE sf LOOP i E SIGNAL NOISE O EAL i j cy COOP REV N Els SATTERY y eo 22000 3 NOISE GAOUNS l pae i y H is a j AGN pt Va forl BAG EL REY 1998 eN e ZN i ka aa O AST Loss aw 2 a O i MEAS O a NY SELECT Seizing The Line Ground Start Originate End To configure the HP 4937A as the Originate End proceed as follows Connect the line under test to either 310 jack A or B Select SIGNALING A if the line under test is connected to 310 Hai i C jack A or SIGNALIN connected to 310 jack B G B if the l
58. specifications are not warranted performance parameters Performance tests are listed in Section IV of this manual 1 6 SAFETY CONSIDERATIONS 1 7 This product is a Safety Class 1 instrument provided with a protective earth terminal The in strument and manual should be reviewed for safety markings and instructions before operation 1 8 INSTRUMENTS COVERED BY THIS MANUAL 1 9 Attached to the instrument is a serial number plate The serial number is in the form 0000A00000 It is in two parts the first four digits and the letter are the serial prefix and the last five digits are the suffix The prefix is the same for all identical instruments it changes only when a change is made to the instrument The suffix however is assigned sequentially and is different for each instrument The contents of this manual apply to the instruments with the serial number prefix s listed under SERIAL NUMBERS on the title page 1 10 An instrument manufactured after the printing of this manual may have a serial number prefix that is not listed on the title page This unlisted serial number prefix indicates the instrument is dif ferent from those described in this manual The manual for this newer number is accompanied by a yellow Changes Sheet supplement This supplement contains change information that explains how to adapt the manua to the newer instrument L 4937A RAL INFORMATION For information concerning a serial number prefix that is not l
59. uits are disconnected from the line under test until both ends of the line have been seized 3 23 Signaling notifies the switch central office PBX etc that a subscriber desires service Signaling also is used to notify the subscriber of incomming calls Then with the necessary data to identify the distant Subscriber the switch will properly route the call 3 24 The terms on hook open switch and off hook closed switch are used throughout this sec tion to describe the state of signaling equipment regardless of the actual type of Signaling used To identify the circuits the terms originate equipment and terminate equipment are used These terms refer only to the hardware configuration and not with the action of initiating the call The terminate Equipment supplies the operating power and current detect circuitry The originate equipment provides a de current path via a switch 3 25 Supervisory signaling deals with the circuits that monitor the status of a Subscriber loop or a trunk line The four types of supervisory Signaling that are commonly used are loop start ground Start loop reverse battery and E M 3 26 The signaling procedures that follow are arranged in a manner to configure the HP 4937A first as the Originate End equipment and then as the Terminate End equipment Procedures to establish talk conditions using the HP 49374 are also included 3 27 LOOP START SIGNALING ORIGINATE TERMINATE i RING 16 a we T
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