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Setting SDH Transmit Parameters

1. Payload As appropriate SETTINGS CTS850 SDH PDH Test Set User M anual Setting SDH Transmit Parameters Table 3 8 Payload Framing Source Payload Allowable choices 140 Mb s Framed Unframed External Add 34 Mb s Framed Unframed External Add 45 Mb s C Bit M13 Unframed 8 Mb s Framed Unframed 2 MB s Unframed External Add Balanced External Add Unbalanced PCM 30 CAS CRC PCM31 CRC PCM 30 CAS PCM 31 64k PCM 30 CAS CRC PCM31 CRC PCM 30 CAS PCM 31 When 64k is the payload framing can also be set from the 64k Tx SETTING menu Setting the Test Pattern Test pattern is selectable when the TX payload is not an externally added signal Table 3 9 Test Patterns Background Patterns Test Patterns Applicable choices PRBS 2 1 STM 4 STM 1 5TM 0 140Mb s 34 Mb s 8Mb s 2 Mb s 64k Test Patterns Normal ITU Inverted Non ITU PRBS 2 1 1 140Mb s 34 Mb s 8Mb s 2 Mb s 64k Test Patterns Normal ITU Inverted Non ITU PRBS 2715 1 STM 4 STM 1 5TM 0 140Mbjs 34 Mb s 8Mb s 2 Mb s 64k Test Patterns Normal ITU Inverted Non ITU PRBS 2720 1 STM 4 5TM L STM 0 140Mb s 34 Mb s 8Mb s 2 Mb s 64k Test Patterns Normal ITU Inverted Non ITU CTS850 SDH PDH Test Set User M anual 3 85 Setting SDH Transmit Parameters Table 3 9 Test Patterns Background Patterns Cont Test Patterns Applicab
2. message H Select Reset Overhead to set all bytes in the path overhead to their default values CTS850 SDH PDH Test Set User M anual 3 97 Setting SDH Transmit Parameters NOTE Reset Overhead does not remove simulated error conditions that have been set using controls in the Defects amp Anomalies page H Select Null Trace to set all the J 1 bytes in the string to the null character Select Default Trace to set the J 1 byte string to the default string Tektronix CTS 850 SDH Test Set hello bonjour guten tag Select Default 64 Byte to set the J 1 byte string to the default string Tektronix CTS 850 SDH Test Set hello bonjour guten tag Select User Trace to set the J 1 byte string to a string you can enter using the EDIT TRACE function Select Default 16 Byte to set the 1 byte string to the string Tek CTS 750 padded with spaces and ending with a carriage return line feed Select EDIT TRACE to define your own text string 2 Select EDIT TRACE to edit the path trace message see Figure 3 38 The string can contain a maximum of 64 characters including spaces 3 Select DONE when you have completed entering the string CTS850 SDH PDH Test Set User M anual Setting SDH Transmit Parameters Transmitting STM 1 AU 4 under test Reset Overhead View VCA Overhead Overhead External Add None C2 Signal Label TUG Structure
3. of the TRANSMIT menu Table 3 13 Transmit TRACE SETTINGS Choices Overhead Testing Choices Trace Select Selects the trace for which information will be displayed Valid selections depend on the current transmit and receive configurations Values J 0 1 2 TX Trace This displays the current TX trace 3 102 CTS850 SDH PDH Test Set U ser M anual Setting SDH Transmit Parameters Table 3 13 Transmit TRACE SETTINGS Choices Cont Overhead Testing Choices RX Trace This displays the current RX trace The display will be be updated as new data is received Expected Trace This field displays the trace value used for trace mismatch Overhead page of the TRANSMIT menu comparisions The user may edit the expected value trace or copy the value from the value being transmitted or received The J 0 RS Trace can be chosen in the Section Tek Measurements Stopped STM 1E TRANSMIT STM 1E Trace Select RS Trace J0 Expected TEK CTS850 S HP Trace QD Recens LP Trace QD TR vee CTS850 OVERHEAD more presTrst A zorz d TSM SME SECTION PAIH SETT NSS OVFRATSD Figure 3 41 Choosing TRACE SETTINGS CTS850 SDH PDH Test Set User M anual 3 103 Setting SDH Transmit Parameters Signal Labels The Signal Labels page available from the TRANSMIT M enu permits selection of the C2 HP Signal Label The different Signal Label settings have
4. 140M b s 34 M b s 45 Mb s 8 M b s 2 M b s or 64k signal to the transmitted signal 2 If the Structure is set to TU 12 specify the TU Under Test by first specifying the Tributary Unit Group TUG as follows Press Menu Select Menu Highlight Button Page Parameter Select Choice TU Under Test TUG3 1 TUG3 4n TUG3 2 TUG3 3 All TU12s 3 If TU12 Async is the selected Structure specify the Tributary Unit TU as follows CTS850 SDH PDH Test Set User M anual Setting SDH Transmit Parameters Press Menu Select Menu Highlight Button Page Parameter Select Choice TU Under Test as appropriate TU12 n 4 If TU3 Async is the selected Structure specify the Tributary Unit TU as follows Press Menu Select Menu Highlight Button Page Parameter Select Choice TU3 TU3 1 TU3 2 TU3 3 AIlTU 3 H Select TU3 1 TU3 2 or TU3 3 to specify the TU Under Test 5 Specify the payload as follows Press Menu Select Menu Highlight Button Page Parameter Select Choice Payload as appropriate NOTE The choices available for Payload depend on the selected Structure CTS850 SDH PDH Test Set User M anual 3 89 Setting SDH Transmit Parameters Setting the Test Pattern User selectable You can select a test pattern to transmit in the TU To specify the test pattern to transmit the choices available for Test Pattern depend on the selected Structure Press Menu Button T
5. 64 Byte ormat Path Ouerhead Path Trace Message 16 Byte G This is a Tektronix CTS8 Format i kk x 50 SDH Test Serl cz 100000010 fee G1 e eX O00 EDIT F2 00000000 TRACE 1000000 x E ore oor 1 00000000 pote TRANSMIT T SECTICK APS OVERHE4D SETTINGS SETTINGS 4813990 OVERHESD COMMANDS TEST Figure 3 38 Editing the 1 Path Trace Byte Adding DCC and User Channel Overhead Bytes You can add data generated by an external protocol analyzer into the Data Communication Channel DCC and U ser Channel T he data from the protocol analyzer is added through the O verhead A dd D rop Port located on the rear panel See Appendix G for detailed information on the port pin assignments To add external data into the DCC 1 Connect an external protocol analyzer to the CTS850 using the Overhead dd D rop Port on the rear panel of the CT S850 CTS850 SDH PDH Test Set User M anual 3 99 Setting SDH Transmit Parameters 2 To configure the CT S850 to add the external data bytes Press Menu Select Menu Highlight Button Page Parameter Select Choice TRANSMIT SECTION External Add None OVERHEAD D1 D3 D4 D12 Fl El E2 El from Handset E2 from Handset Select None if you do not want to add external data H SelectD1 D3to add data generated by an external protocol analyzer to the D1 D3bytes of the DCC H SelectD4 D12to add data ge
6. 850 SDH PDH Test Set User M anual 3 79 Setting SDH Transmit Parameters Setting the SDH Structure This selection sets the structure of the AU under Test SDH input rates only The VC4 4cchoice requires a Transmit Rateof STM 4 Press Menu Select Menu Highlight Button Page Parameter Select Choice TRANSMIT Transmit Settings Structure VC4 4cBulk STM 4 AU 4Bulk AU 4140 Mb s TU 3Async TU 12Async STM 1 AU 4Bulk AU 4140 Mb s TU 3Async TU 12Async STM 0 AU 3Bulk Tek Measurements Stopped amp STM 1 TRANSMIT amp No Sig Transmit Rate ame STM 1 Optical Transmit Clock nee Internal ga SDH Structure 2 10 12 Floating Async TUG 3 2 TU Under Test 06 2 10 12 TU Background Fill Idle 11010101 Payload Structure e 2 Mb s Unframed TUG 3 3 lest Pattern PRBS 2815 1 Normal All TU 12s T XA RN Setup nn Independent EA Figure 3 31 Chosing TU Under Test from SDH Structure 3 80 CTS850 SDH PDH Test Set U ser M anual Setting SDH Transmit Parameters Tek Measurements Stopped TRANSMIT amp Istm 4 Transmit Rate Transmit Clock SDH Structure Payload Structure lest Pattern TX Rx Setup 246 IX SFTTINES ANOMAL DEFECT amp POINTERS 75 amp TIMING STM 4 Optical Internal VC4 4c Bulk Equipped PRBS 2 23 1 Normal Coupled IT TEF 2 W
7. 850 to add the external data byte Press Menu Select Menu Highlight Button Page Parameter Select Choice TRANSMIT PATH External Add None OVERHEAD F2 NOTE The F2 byte cannot be externally generated for VC3 Overhead owever the F 2 byte can be edited from the PATH OVERHEAD page Select None if you do not want to add external data H Select F2 to add data generated by an external protocol analyzer to the U ser Channel CTS850 SDH PDH Test Set User M anual 3 101 Setting SDH Transmit Parameters As soon as you select F2 the CTS850 displays the words EXT ADD as the value for F2 see Figure 3 40 Tek Measurements Stopped amp STM TIE TRANSMIT amp 2 Mb s Transmitting STM AU 4 1 under test Overhead View VC4 Overhead None External Add IMS C2 Signal Label Equipped Non specific F2 Path Overhead Path Trace Message Ji USER 64 This is a lektronix CIS8 UO 50 lest Set c2 000000901 Gl xxxx0O0Ox Fe FXT ADD O00000 x 00000000 00000000 00000000 246 IX PATH set ION APL CETTINCS Eee OUTRIIERD COMMENTS Figure 3 40 Adding Data into the User Channel TRANS SETT NSS OVERHEAD are pote Trace Settings The Trace Settings page available from the TRANSMIT Menu permits Trace Mismatch comparisons This function is used for continuity testing The 0 RS Trace can be chosen from the Section Overhead page
8. ANDES CHOICES VC4 4c AU 4 Bulk AU 4 140 Mb s TU3 Async 34 Mbs TU12 Async Figure 3 32 Chosing VC 4cfrom SDH Structure CTS850 SDH PDH Test Set User M anual 381 Setting SDH Transmit Parameters TU Under Test When STM 115 chosen as the Transmit Rate and TU 120rTU 3 chosen as the Structure the TU under test selection permits the choice of the following Selections are mutually exclusive exclusive TU 12 TUG3 TUG3 1 TUG3 2 TUG3 3 TUG2 1 2 3 4 5 6 7 TU 12 1 2 3 TU 3 TU 3 1 2 3 TU 3 1 TU 3 2 TU 3 3 Setting the TU Background Fill When STM 115 chosen at the Transmit Rate and TU 12orTU 3 chosen as the SDH Structure the TU Background Fill permits the user to select the pattern inserted into the inactive TU 125 Supported values for TU 12arePRBS2 15 lorIDLE TU 3 background channels are always filled with the idle pattern 3 82 CTS850 SDH PDH Test Set User M anual Setting SDH Transmit Parameters Setting the SDH Ouput SDH Output permits the test set to transmit a valid bulk filled SDH signal when the primary test signal is PDH The SDH output will be displayed whenever the Transmit Rate is 140 M b s or less Output rate selections STM 4 STM 1 STM Disabled Output type is Optical or Electrical Electrical is not available for STM 4 Tek Measurements Stopped 10 Mb TRANSMIT 140 Mb Transmit Rate 140 Mb s Transmit Clock Internal Disabled Line C
9. ANSMIT Menu permits PRBS insertion into a selected overhead byte This function is used for continuity testing Tek Measurements Stopped TRANSMIT No Sig Tx Overhead PRBS Test EEE 215 1 Normal None Rx Overhead PRBS Test E1 2 15 1 Normal Pattern Lock Unlocked Errors n O BER a co E E2 F1 more lof2 TRANS SECTION PAIH Lac sone ore srt 555 povrrurean ovredrep srTTINGS EEISENXM E gt Figure 3 43 Choosing OVERHEAD PRBS TEST Table 3 14 Transmit OVERHEAD PRBS TEST Choices Overhead Testing Choices TX Overhead Sets up PRBS insertion into a selected overhead byte for PRBS Test continuity testing Three fields select the byte PRBS pattern and pattern inversion Byte selections None D1 03 04 D12 EL1 E2 F1 F2 Patterns PRBS15 PRBS20 PRBS23 Inversion Standard Inverted RX Overhead Sets up PRBS insertion into a selected overhead byte for PRBS Test continuity testing Three fields select the byte PRBS pattern and pattern inversion Byte selections None D1 03 04 D12 E1 E2 F1 F2 Patterns PRBS15 PRBS20 PRBS23 Inversion Standard Inverted CTS850 SDH PDH Test Set User M anual 3 105 Setting SDH Transmit Parameters 3 106 CTS850 SDH PDH Test Set User M anual
10. E Setting SDH Transmit Parameters This section describes how to set the transmit rate specify the AU under test set the payload mapping and content and set the overhead bytes for SDH signals The CTS850 SDH PDH Test Set contains independent transmitter and receiver modules One set of parameters controls the transmitter module and another set controls the receiver module You can set the parameters that control the transmitter independently or you can choose to link the parameters to the receiver settings Tek Measurements Stopped 2 STM TE STM 1E Transmit Rate ne STM 1 Electrical Transmit Clock Internal Transmit Level SDH Structure AU 4 Bulk STM 1 Payload Structure wu Bulk Test Signal 0 181 STM 0 lest Pattern PRBS 2423 1 Normal 140 Mb s more TRARRE SETUD edt Independent 10f2 e4k Ix DEFECT Bone INTER S as J more FTTINES ANOMAL 25 wanprs fcommanns l tot Figure 3 26 Settings Menu CTS850 SDH PDH Test Set User M anual 3 71 Setting SDH Transmit Parameters Steps for Setting Parameters The sequence of steps for setting transmit parameters varies with the type of signal to be transmitted The figures that follow show the sequence of steps required to set the transmit parameters of an SDH signal without a mapped PDH signal and an SDH signal witha mapped PDH signal See the next section for details on set
11. OICES Reset Overhead Set lo 10101010 Cannot edit e LII because alarm is set Default 00000000 EDIT BYTE Select Reset O verhead to set all bytes in the overhead to their individual default values However Reset Overhead does not remove simulated error conditions that have been set using controls in the Defects amp A nomalies page A simulated error condition overrides the default value of the overhead byte that signals that particular error condition Select Default XXXXXXXX to set the selected byte to its default value T he specific default value depends on the selected byte and on the rate and structure of the signal Select EDIT BYTE to define the byte as a value different from the preset choices 3 To edit the selected byte to a value of your choice Highlight Parameter Press Menu Button Select Menu Page Select Choice EDIT BYTE CTS850 SDH PDH Test Set User M anual 3 93 Setting SDH Transmit Parameters 3 94 H Define your own byte with the buttons next to Land 0 Use the left and right arrow buttons to move the cursor from one bit to the next See Figure 3 37 H When you finish editing the byte select DONE Tek Measurements Stopped amp STM 1F STM 1E TRANS BIE Transmitting STM 1E with AU 4 1 under test Showing Overhead for AU 4 1 cols 1 4 7 1 Fxternal None 0 Column 1 Colum 4 Column 7 1 111110110 z 00101000 c 100000001 El queo ox x x e
12. RANSMIT Select Menu Highlight Page Parameter Select Choice TRANSMIT Test Pattern as appropriate SETTINGS Select Lin 8 to set the test pattern to 10000000 H For PDH Payloads only select User Word 8 bit User Word 16 bit or User Word 24 bit to set a test pattern different from the preset choices If you choose User Word the test pattern description changes to display the byte selected If you select User Word 8 bit 16 bit 24 bit for the test pattern set the value of the User Word as follows 1 Set the contents of the User Word Byte s as follows see Figure 3 35 Press Menu Select Menu Highlight Button Page Parameter Select Choice Test Pattern Set to 00000000 Set to 11111111 Default 10101010 EDIT BYTE Edit XX bits 2 Select EDIT BYTE Edit XX bits to specify a value different from the preset choices 3 Select DONE when you are finished editing the pattern CTS850 SDH PDH Test Set User M anual Setting SDH Transmit Parameters Tek Measurements Stopped 2 2 Mb ETET amp 2 Mb Transmit Rate sss 2 Mb s AMI Bal Set lo Transmit Clock Internal 00000000 Line Clock Offset 0 0ppm re Set lo 11 Default Payload 2 Mb s Unframed 10101010 lest Patte 000000000000000000000000 Ease Edit 24 bits Predefined Setup Independent Patterns Sk Ix PAIH Sec ION ary EA SETTINGS ovre re n COMMANDS Figure 3 35 Editing
13. TU 12 Floating A sync or TU 3 Floating A sync mapping you must also specify the tributary unit under test and payload see next Figure Tek Measurements Stopped eran E TRANSMIT JSTM 1E Transmit Rate aan STM 1 Electrical VCA Ac Transmit Clock Internal Bulk Transmit Level SDH Structure TU Under Test an TU 12 Floating Async AU A Bulk TUG 3 1 TUG 2 1 TU 12 1 TU Background Fill ldle 11010101 AU A Payload Structure wu 2 Mb s Unframed 140 Mb s Fest Pattern PRBS 2423 1 Normal TU 3 Async 340r 45 Mbs TU 12 TRERE 5 ae Coupled Async Z Mb s Bak Dx DOES POI EIS ITER amp II are SETTINGS ANOMAL 75 amp TIG 10r d Figure 3 34 a Tributary Signal CTS850 SDH PDH Test Set User M anual 3 87 Setting SDH Transmit Parameters To configure the CT S850 for mapping a signal 1 Set the Structure as follows Press Menu Select Menu Highlight Button Page Parameter Select Choice TRANSMIT TRANSMIT Structure TU12 Async SETTINGS TU3 Async 140 Mb s H Select TU12 Async to map an externally supplied or internally generated 2 M b s or 64k signal to the transmitted signal H Select TU3 Async to map an externally supplied or internally generated 34 M b s 45 M b s 8 M b s 2 M b s or 64k signal to the transmitted signal H Select 140 M b s to map an externally supplied or internally generated
14. a dependance on the menus accessible from TRANSMIT Transmit Setting SDH Structure choices STM 4 VC4 4cBulk AU 4Bulk AU 4140 Mb s TU 3Async 34 M 0 5 TU 12Async 2 Mb s and the TRANSMIT Path Overhead C2 Signal Label choices Unequipped Equipped TUG TU n 34 M b s 140 M b s ATM MAN DQDB FDDI 0 181 VC AIS The C2 HP Signal Label choice V C4 Overhead is enabled when the HP Signal Label Mismatch Detection choice enabled at the RECEIVE Analysis Config page The C2 LP Signal Label choice V Overhead M apped is enabled when the LP Signal Label Mismatch Detection choice enabled at the RECEIVE Analysis Config page The C2 V5 Signal Label choice V C12 Overhead TU12 M apped is enabled when the LP Signal L abel M ismatch Detection choice enabled at the RECEIV E Analysis Config page Tek Measurements Stopped I TRANSMIT e No Sig C2 HP Signal abel Expected ee eap UG Structure 00000001 E al eq ipped UD a 00000010 TUG Structure 00000000 C21P Signal label Lnequipped Expected 00000100 TU 3 Async Default 00000010 EDIT BYTE Heus Section PAIH TRACE OVERHEAD more SETT NSS OVIRATAD OVERHEAD SETTINGS LABELS PRES TEST 2ot Figure 3 42 Choosing SIGNAL LABELS 3 104 CTS850 SDH PDH Test Set U ser M anual Setting SDH Transmit Parameters Overhead PRBS Test The Overhead PRBS Test page available from the TR
15. al 2 M b s or 2 M Hz reference to the E xternal Clock Input connector on the rear panel H Select External 1 5 M b s BITS to use the clock signal from an external 1 5 M b s BITS reference CTS850 SDH PDH Test Set User M anual 3 7 Setting SDH Transmit Parameters Setting the Line Clock Offset Line Clock offset is used for setting PDH Transmit Parameters Range is 100 ppm Press Menu Select Menu Button Page TRANSMIT Transmit Settings Highlight Parameter Line Clock Offset Select Choice Max 100 ppm Stress 20 ppm Stress 20ppm Default 0 ppm User Defined Setting the value through the front panel knob will change to support setting the full valid range Setting the Transmit Level Transmit Level is an option for STM 1EandSTM OE Transmit Level will not be displayed for other rates Press Menu Select Menu Highlight Button Page Parameter Select Choice TRANSMIT TRANSMIT Transmit Level 0 dB SETTINGS 6dB Select 0 dB to set the line level to high H Select 6dB to setthe linelevel to the cross connect level CTS850 SDH PDH Test Set User M anual Setting SDH Transmit Parameters Specifying the AU to Test AU under test is only displayed when the input rateisSTM 4and the signal structureis 1 x AU 4 To designate which AU to test Press Menu Select Menu Highlight Button Page Parameter Select Choice TRANSMIT TRANSMIT AU Under Test 1 2 3 4 SETTINGS CTS
16. ansmitting an optical signal at the STM 4 rate Coupling Transmit and Receive Settings If your application requires that the transmit settings and receive settings be identical you can save time by coupling them together After they are coupled any change you make to a parameter on the TRANSMIT SETTINGS page will also be made to the correspond ing setting in the RECEIVE SETTINGS page of the RECEIVE menu The inverse is also true CTS850 SDH PDH Test Set User M anual 3 73 Setting SDH Transmit Parameters 3 74 Available SDH transmit rates Tek Measurements Stopped STM 1E TRANSMIT STM 1E Transmit Rate nen STM 1 Electrical Transmit Clock Internal Transmit Level OdB SDH Structure s AU 4 Bulk Payload Structure Bulk Test Signal 0 181 lest Pattern PRBS 2823 1 Normal 140 Mb s more Tx Rx Setup nennen Independent 1of2 Dtree sf romics mirer s more SETTINCS ANOMAL 25 WANDES iot Figure 3 29 SDH Transmit Rates To couple the transmit and receive settings together from the TRANSMIT SETTINGS page Press Menu Select Menu Highlight Button Page Parameter Select Choice TRANSMIT TRANSMIT Tx Rx Setup Coupled SETTINGS NOTE When settings are coupled from the TRANSMIT SETTINGS page the receive parameters are changed to match the transmit parameters Conversely when settings are coupl
17. assignment of bit patterns appears in both the Transmit menu and and the Receive menu under the Section Overhead tab Slbitsb5 b8 Sync Status M essage 0000 Quality Unknown 0001 Reserved 0010 G 811 PRC 0011 Reserved 0100 G 812 transit 0101 Reserved 0110 Reserved 0111 Reserved 1000 G 812 local 1001 Reserved 1010 Reserved 1011 G 813 SETS Synchronous Equipment Timing Source 1100 Reserved 1101 Reserved 1110 Reserved 1111 Do not use CTS850 SDH PDH Test Set User anual Setting SDH Transmit Parameters Bytes you can never edit S1 byte selected to edit Tek Measurements Stopped TRANSMIT IsTm 1 Transmitting STM 1 Showing Overhead for AU 4 1 under test AU 4 1 cols 1 4 7 External Add None JO RS Trace TEK CTS850 1 Sync Status Message G 812 Transit Column 1 Column 4 Column 7 1 11110110 00101000 I USER E1 Kk OO X KA E1 00000000 H 1000900000 w 00000000 be 100000000 rz 00000000 HO x xn e e x ae H2 poe H3 voco eoe EZ xoxo oe e oe K1 60000000 K2 00000000 D4 00000000 Ds 00000000 00000000 o7 00000000 bs 100000000 cs 00000000 D 0 00000000 D11 00000000 21200000000 s1 00000100 00000000 tz BIDUO TRANSMIT px PATH APL NETT WSS SETTINGS OYFRATSD COMMAN TS Figure 3 36 Editing the S1 Section Overhead Byte There are several ways to edit the byte H OVERHEAD TFT err CH
18. e E1 100000000 Ft 100000000 D D1 00000000 c2 100000000 D 100000000 H1 ok X Kk kk Hz kk KR RRR Ho e Ak kA RAK EZ ek kk ek oe 100000000 100000000 D 00000000 cs 100000000 p amp 100000000 I D7 100000000 100000000 100000000 01 100000000 11100000000 012100000000 51 100080000 00000000 tz 100000000 DONE TRANZMIT POINTERS JITTER APS SECTION SETTINGS TIRING weNDrR COMMANDS ROAR OV FRHESD Figure 3 37 Editing an Overhead Byte Editing the VC4 VC3 and VC12 Overhead Bytes To edit the V C4 VC3 or V C12 overhead bytes Press Menu Select Menu Highlight Button Page Parameter Select Choice RECEIVE PATH Overhead View VC4 Overhead OVERHEAD VC3 Overhead VC12 Overhead CTS850 SDH PDH Test Set U ser M anual Setting SDH Transmit Parameters NOTE The choices available depend on the signal Structure If the signal Structure is set to TU 12 you can edit the V5 N2 and K 4 bytes after displaying the VC 12 Overhead The J2 trace byte is fixed and cannot be edited N ote that only bits 5 6 and 7 the signal label bits of the V5 byte are editable See Table 3 10 Table 3 10 Choices for Bits 5 6 and 7 of the V5 Byte Choice Unequip 000 Equipped 001 Async 010 Bit Sync 011 Byte Sync 100 Reserved 101 TSS4 110 VC AIS Bytes You Cannot Edit Certain bytes in the section overhead and path overhead can
19. ed from the RECEIVE SETTINGS page the transmit parameters are changed to match the receive parameters Notice that the signal status icons in the upper right corner of the display changed to reflect the coupling of the settings CTS850 SDH PDH Test Set User M anual Setting SDH Transmit Parameters To change transmit and receive settings so that they are no longer coupled Press Menu Select Menu Highlight Button Page Parameter Select Choice TRANSMIT TRANSMIT Tx Rx Setup Independent SETTINGS Notice that the signal status icons in the upper right corner of the display changed to indicate that the settings are no longer coupled Through Mode Use Through M ode to monitor a signal without changing it In Through M ode the rate and content of the transmitted signal is that of the received signal You cannot make changes to pointers or timing overhead bytes or insert alarms or errors when the CTS850 isin Through M ode Through M ode does not perform clock recovery before retransmitting the recovered signal Through M ode is used for nonintrusive performance monitoring of the active signal To put the CTS850 into Through ode Press Menu Select Menu Highlight Button Page Parameter Select Choice TRANSMIT TRANSMIT Tx Rx Setup Through Mode SETTINGS To indicate when the CTS850 is in Through M ode the transmit and receive icons at the upper right corner of the display have an arrow linking them together and
20. ication Chan nel External Add is enabled K1 K2 MS AIS SET MS AIS is being simulated RDI SET MS RDI is being simulated D4 D5 D6 D7 EXT ADD MS Data Communication Chan D8 D9 D10 D11 nel External Add is enabled D12 51 REI SET MS REI is being simulated CTS850 SDH PDH Test Set User M anual Setting SDH Transmit Parameters Table 3 12 Bytes You Cannot Edit Due to Parameter Settings Cont Section and Text String that Path Overhead Replaces the Parameter Setting Affecting Byte s Binary Values Byte E dit Capability Gl HP RDI SET HP RDI is being simulated HP REISET HP REI is being simulated All path overhead AU AIS SET AU AIS is being simulated bytes set to ones Editing the J 1 Path Trace Byte The 1 Path Trace Byte carries a fixed length 16 or 64 byte string intended for sending user messages T he Path Trace Byte is a string consisting of ASCII characters rather than the ones and zeros used to edit the other overhead bytes the 16 byteformat includes a CRC byte 16 byteand 64 byteare two different formats To edit the J 1 Path Trace Byte 1 Display the Path Trace B yte as follows Press Menu Select Menu Highlight Button Page Parameter Select Choice TRANSMIT PATH 1 byte Reset Overhead OVERHEAD 64 byte Format 16 byte Format Edit Trace Default Trace The text string USER is shown in place of the actual byte value There are five ways you can change the Path Trace
21. le choices PRBS 2723 1 STM 4 STM 1 STM 0 140Mb s 34 Mb s 8Mb s 2 Mb s 64k Test Patterns Normal ITU Inverted Non ITU All Ones STM 4 STM 1 STM 0 140Mb s 34 Mb s 8Mb s 2 Mb s 64k All Zeros STM 4 STM 1 STM 0 140Mb s 34 Mb s 8Mb s 2 Mb s 64k 10101010 140Mb s 34 Mb s 8Mb s 2 Mb s 64k lin8 140Mb s 34 Mb s 8Mb s 2 Mb s 8 bitfixed STM 4 STM 1 STM 0 140Mb s 34 Mb s 8Mb s 2 Mb s 16 bitfixed 140Mb s 34 Mb s 8Mb s 2 Mb s 24 bitfixed 140Mb s 34 Mb s 8Mb s 2 Mb s TS Idle 64k 1020 Hz 0 dBm 64k Background Patterns PRBS 2723 1 34Mb s 8Mb s PRBS 2720 1 34Mb s 8Mb s PRBS 2715 1 34Mb s 8Mb s 2 Mb s All Ones 34Mb s 8Mb s 2 Mb s All Zeros 34Mb s 8Mb s 2 Mb s 10101010 34Mb s 8Mb s 2 Mb s CTS850 SDH PDH Test Set User M anual Setting SDH Transmit Parameters Selecting the Tx Rx Setup Tx Rx Setup permits the operator to couple Transmit and Receive settings or select Through M ode When coupled mode is selected from the Transmit Setting menu applicable Transmit Settings are copied to the Receive side of the tester Mapping a PDH Signal To map a tributary signal you first set the SDH Structure to the appropriate PDH mapping as described in the previous section When mapping a signal you must also specify the payload The payload can be either an external signal connected to the appropriate IN connector on the front panel or an internally generated signal When you use the
22. lock Offset 0 0ppm SDH Output sss STM A Payload Structure 2 Mb s PCM30 CAS CRC STM 1 lest Pattern PRBS 2423 1 Norma 34Mb s Active Channel 1 Background 2415 1 STM 0 8Mb s Active Channel 1 Background 2415 1 2Mb s Active Channel 1 Background 2415 1 TIARY Setup ses Coupled sak 1 SFTTINES DEFECT amp POINTERS WIT TEF S ANOMAL 75 amp TIMING WANDES Figure 3 33 Choosing SDH Output CTS850 SDH PDH Test Set User M anual 3 83 Setting SDH Transmit Parameters Setting the Payload Structure Payload sets the signal generation base rate B ecause of the number of selections available the rate and framing parameters have been split If the payload rate is not the same as the mapping SDH or transmit PDH rate then multiplexing is implied Table 3 7 TX Rates and Structures TX Rate TX Structure Multiplexing combinations STM 4 VC4 4c only for STM 4 Bulkfill Equipped or Unequipped STM 1 AU 4 only TU 12 2Mb s 64k TU 3 34Mb s 8Mb s 2Mb s 64k 140 Mb s 140 34 8 2 Mb s 64k STM 0 AU 3 Bulk Equipped amp Unequipped 140 Mb s Not Applicable 34Mb s 8Mb s 2Mb s 64k 34 Mb s Not Applicable 34 Mb s 8Mb s 2 Mb s 64k 45 Mb s 2 Mb s Not Applicable 2Mb s 64k Bulk fill of aTU 12 TU 30rVC4 4cis not supported To set the payload Press Menu Button TRANSMIT Select Menu Highlight Page Parameter Select Choice TRANSMIT
23. nerated by an external protocol analyzer to the D4 D12bytes of the DCC Select F1 to add data generated by an external protocol analyzer to the F1 byte of the DCC As soon as you select which bytes to add data to the CTS850 displays the words EXT ADD as the value for the selected bytes see Figure3 39 3 100 CTS850 SDH PDH Test Set U ser M anual Setting SDH Transmit Parameters Tek Measurements Stopped 2 STM TE TRANSMIT 2 Mb s CHOICES Transmitting STM 1E AU 4 1 under test Showing Overhead AU 4 1 cols 1 4 7 None External Add wa DCC D1 D3 gt JO RS Trace TEK CTS850 D1 D3 1 Sync Status Message Quality Unknown Column 1 Column 4 Column 7 11110110 42 00101000 1 USER DA D12 El kk ko REA X 00000000 00000000 EXT ADD be ENT ADD EXT ADD x ox x x H2 xo pee ee EZ xx x n e x K 00000000 gt 00000000 F1 D4 00000000 bs 100000000 00000000 D 00000000 100000000 cs 00000000 oo 00000000 011 00000000 21200000000 more s1 00000000 00000000 tz 00000000 lof2 TRANS sak IX PATH ap OVERHEAD SITT NSS SFTTINES OVTRATSD COMMANDS TIT 2ot Figure 3 39 Adding Data into the DCC To add external data into the U ser Channel 1 Connect an external protocol analyzer to the CTS850 using the Overhead dd D rop Port on the rear panel of the CT S850 2 To configure the CTS
24. not be edited in the SECTION OVERHEAD or PATH OVERHEAD pages These uneditable bytes have calculated values that are based on the payload and signal structure see Table 3 11 Table 3 1 Overhead Bytes That Cannot Be Edited Overhead Byte Function Bl Section level parity byte B2 MS level parity byte B3 Path level parity byte Gl Path status CTS850 SDH PDH Test Set User M anual 3 95 Setting SDH Transmit Parameters Table 3 1 Overhead Bytes That Cannot Be Edited Cont Overhead Byte Function H1 H2 H3 Identify location of payload H4 Multiframe indicator The bytes that cannot be edited are marked with a line of asterisks on the SECTION OVERHEAD or PATH OVERHEAD pages see Figure 3 page3 93 In addition there are bytes you may not be able to edit depending on parameter settings the CTS850 As shown Figure 3 36 a short text string replaces the binary values in the byte field of the SECTION OVERHEAD and PATH OVERHEAD pages when a byte cannot be edited Table 3 12 shows the affected bytes the text string and a description of the parameter setting that prevents the byte from being edited Table 3 12 Bytes You Cannot Edit Due to Parameter Settings Section and Text String that Path Overhead Replaces the Parameter Setting Affecting Byte s Binary Values Byte E dit Capability Al A2 LOF SET Loss of Frame Failure is being simulated D1 D2 D3 EXT ADD RS Data Commun
25. the User Word Byte Setting Overhead Bytes To stress test a network you sometimes need to simulate errors or alarms Use the controls on the Defects amp Anomalies page of the TRANSMIT menu to simulate errors or alarms As an alternative you can edit the transport overhead and path overhead bytes directly to simulate errors alarms and create other stress conditions This section describes how to use the SECTION OVERHEAD and PATH OVERHEAD pages to edit overhead bytes How to Edit an Overhead Byte The following procedure applies to editing either section overhead or path overhead bytes However when editing path overhead bytes you must specify which overhead you want to edit VC4 VC3 or VC12 before you can edit the overhead bytes CTS850 SDH PDH Test Set User M anual 3 91 Setting SDH Transmit Parameters To edit overhead bytes 1 Display the section overhead as follows then select the columns you wish to edit Press MORE 2 of 2 to see the Section Overhead Page choice Press Menu Select Menu Highlight Button Page Parameter Select Choice TRANSMIT Section Overhead Showing as appropriate Overhead for 2 Turn the knob to highlight the byte you want to edit See Figure3 36 When editing the S1 byte shown in next figure entering the following bits will result in the corresponding label in the line on the Section Overhead menu called Sync Status M essage shown in next figure This message line showing the
26. the parameters on the TRANSMIT SETTINGS page are replaced by a message stating that the CTS850 isin Through M ode see Figure 3 30 CTS850 SDH PDH Test Set User M anual 3 75 Setting SDH Transmit Parameters To take the CT S850 out of Through M ode Press Menu Select Menu Highlight Button Page Parameter Select Choice TRANSMIT TRANSMIT Tx Rx Setup Independent SETTINGS Through Mode icon Tek Measurements Stopped o Sig I TRANSMIT o Sig CHOICES Independ ent The test set is in Through Mode The transmitted signal is identical to the received Coupled signal Transmitter changes will have no effect in this mede in this mod Through Mode Tx Rx Settings on Through Mode sake verect s romics irene SETTINCS ANOMAL 25 amp TIMING WANDES Lot Figure 3 30 CTS850 in Through Mode CTS850 SDH PDH Test Set User M anual Setting SDH Transmit Parameters Setting the Transmit Clock To specify the transmit clock Press Menu Select Menu Highlight Button Page Parameter Select Choice TRANSMIT TRANSMIT Transmit Clock Internal SETTINGS Recovered External 2 Mb s 2 MHz External 1 5 Mb s H Select Internal to set the transmit clock to the internal clock H Select Recovered to use the clock recovered from an incoming signal H Select External 2 Mb s 2 M Hz to use the clock signal from an external clock input 2 M b s or 2 M Hz data timing reference Attach an extern
27. ting PDH signal parameters for example 2 M b s Set Set Setlevel Specify SDH Set __ Set __SetTest Rate Clock v Structure Structure Payload Pattern only Figure 3 27 for Setting SDH Signal Parameters Set Set ges Set Set Rate Clock SDH Structure TU under Test Set Payload and Payload Panis Framing Figure 3 28 Sequence for Setting SDH Signal Parameters When Mapping a PDH Signal Setting the Transmit Rate To set the transmit rate Press Menu Select Menu Highlight Button Page Parameter Select Choice TRANSMIT TRANSMIT Transmit Rate as appropriate SETTINGS see Figure 3 29 onpage3 74 3 72 CTS850 SDH PDH Test Set U ser M anual Setting SDH Transmit Parameters H Select STM 1E or OE STM 1 STM 4 STM OE or STM 0 to transmit an SDH signal Select 2 M b s 34 Mb s 140M b s to transmit a PDH signal See the next section for details on setting PDH signal parameters If your CTS 850 test set supports the 45 Mb s option there is also a 45 Mb s signal available for selection NOTE Even though there are output connectors for both SDH and PDH signals on the CTS850 front panel the CTS850 can transmit only type of signal at a time Independent Transmit and Receive Settings Generally you can set the transmit and receive settings independent ly For example you can receive an electrical signal at the STM 1E or OE rate while simultaneously tr

Setting SDH Transmit Parameters

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