ADTRAN HTU-C / 3192 User's Manual
Contents
1. LP2 line coding and framing chart above If these voltages are not present open pairs or mis wiring is indicated As with other if not UNFR LEDs should be illuminated circuits standard resistance measurements between each conductor and ground should also be 4 If all LEDs are correct used to test for a grounded conductor a Verify that the signal quality is the same on each loop Ensure signal quality indicators do a Ifthe HTU C is optioned for LV and there are two HREs in the circuit the HTU R could fail to not fluctuate power up normally The LEDs on the HREs or HTU R will flash at a rate of 3 times second Make b Verify that the loop loss is within design limits If there is a difference of more than 1 dB sure the voltage option on the HTU C is set to HV Sn between the two loops a problem exists with the cable pairs a A high resistance open which degrades to the point that it causes the circuit to lose sync can c If errors occur use the Current System Status and Performance History screens to determine be TOEL by reseating the HTU C Test the cable pairs before reseating the HTU C where they are occurring See Troubleshooting Guide section Running Excessive Errors on the Loop 5 If everything checks out proceed with BERT testing m Measure t r resistance as described above If the pairs are unbalanced by more than 4 ohms or a measurement varies a great deal this could indicate a high resistance open or an intermittent fault on the loop2. N A 125 130 vee HTU C LV HRE1 HTU R 130 135 110 135 110 135 N A N A 100 135 HTU C HV HRE 2 HTU R 185 190 160 185 160 185 140 185 140 185 130 185 NOTE All measurements taken with HTU C installed With the HTU C unseated or with protector removed at VMDE t r resistance will be cable resistance plus 3 ohms for either HRE or HTU R The HTU R has Power but LP1 and LP2 LEDs are Dark The Unit cannot Sync with the HTU C Simplex power for powering the HTU R can be passed over cable pairs that contain load coils or 1 Set option switches according to circuit design and local practice that are too long for HDSL synchronization Using a TIMs verify the circuit is within design limits 2 Install HTU C and HTU R The HTU R will power up as long as there is at least one good conductor on each loop To test remove the protector plug at the MDF and measure t r resistance to the HTU R on both loops The HTU R will place a 3 ohm short between t r on both loops An extremely high impedance indicates an open conductor An extremely low reading on one loop may indicate a t r short in 3 See reverse side of this job aid to ensure all LEDs are correct and synchronization has occurred a HTU C will have red ALM LED if not connected to network LP1 and LP2 should be solid Breen the field In the field measure t t and t r voltage with the HTU C installed and compare to the b HTU R will have red ALM LED if no customer connected LP1
3. JOBAIp ADRAN HTU C 3192 SA 0104 HTU C 31 o STATUS LEDs _ CIRCUIT BOARD ROTARY SWITCH SW2 CLEI TILASNSC LP1 LP2 O OFF No synchronization between the HTU C and the next Selects the DSX 1 Line Build Out i e HDSL unit HRE or HTU R on loop loop2 m 0 0 sets LBO to 0 133 feet RED Poor signal quality on loop1 loop2 B Lre 133 sets LBO to 133 266 feet RAN YELLOW Marginal signal quality loop on loop loop2 B 2n 266 sets LBO to 266 399 feet HTU C GREEN Good signal quality on loop1 loop2 m 3 0 399 sets LBO to 399 533 feet a de m 4 533 sets LBO to 533 655 feet 1245004L6 FLASHING _ Error detected at HTU C or HTU R Note Pociinnk GE ee H OLP DSX O OFF DSX 1 signal not detected a ner Do FLASHING BPV Frame Error SF CRC Error ESF is detected S l CIRCUIT BOARD JUMPER P1 Q LP2 GREEN DSX 1 signal is present and synchronized ne L DSX ALM O OFF No alarm condition detected Selects the span powering voltage ar RED Local alarm condition detected HTU C or local and LV 140 Vd OAM remote alarm condition detected HTU C and HTU R 7 a dto r averci wihi iori HRE YELLOW Remote alarm condition detected HTU R HV 190V i p am c l Q LBK raK Z OPE peace loopback Used to span power circuit with multiple HREs C pe ais FLASHING Armed but not in loopback t g LBK YELLOW Local loopback is active CIRCUIT BOARD JUMPER P3 S E col ae FACEPLATE SWITCH SW1 Selects th
4. de TC X Asynchronous Data Format eight data bits no parity none one stop bit Latching Loopback Power Code PC F C When using a PC with terminal software be sure to disable any power saving T1 programs Allows only standard T1 testing FT1 Allows for fractional T1 testing WARRANTY External Alarm Enabled Warranty for Carrier Networks products manufactured by ADTRAN and supplied External alarm is enabled under Buyer s order for use in the U S is ten 10 years For a complete copy of CAUTION Disabled ADTRAN s U S Carrier Networks Equipment Warranty SUBJECT TO ELECTROSTATIC DAMAGE e External alarm is disabled 877 457 5007 Document 414 OR DECREASE IN RELIABILITY HARDEINGIERE CAUTION HEGUIBED For complete Installation and Maintenance 877 457 5007 Document 300 Please have your fax number available Pricing and Availability 800 827 0807 TURN UP amp TROUBLESHOOTING GUIDE we www adtran com 61245004L6 22B Frequency Maximum kHz Loss Data dB 10000 15 00 50000 25 50 100000 30 00 150000 32 15 196000 35 00 a 200000 35 25 t t Voltage t t Voltage t t Voltage t t Voltage t t Voltage t t Voltage NOTE If your TIMs is unable to transmit 200 kHz tone keriak koaa M MA MA AA Ha set the TIMs to one of the frequencies shown above and Open at Frame LV 145 150 N A N A N A N A N A compare the received signal to the maximum loss at that HTU C LV HTU R 145 150 145 150 130 145 N A
5. e framing of the HDSL circuit r ae Selects response of HTU R upon Customer Loss of Signal UNE AIS HTU C operates in unframed mode DIS E aa HTU R generates unframed all 1s toward network upon loss of customer signal AUTO LBK HTU C auto detects framing HTU R generates loopback towards network upon loss of customer signal CDI DSX EQ BANTAM JACKS HTU R generates framed all 1s toward network upon loss of customer signal Provides an intrusive test access point to the data stream FACEPLATE SWITCH SW3 COMPLIANCE CODES TX Accesses the data stream being received from the local loop Loopback Timeout This product complies with UL 1459 third RX ee a edition It is intended to be installed in an Accesses the data stream being transmitted to the local loop Loopback timeout is enabled enclosure with an Installation Code IC of Disabled B or E and in Restricted Access Locations Loopback timeout is disabled only Input current at maximum load is 1 A RS 232 DB 9 CONNECTOR Manual Line Code Select and maximum output at overcurrent condi Used to access performance monitoring data perform loopbacks and provision units AMI tion is 160 mA at 188 Vdc via VT100 aia software such as Hyper Terminal Private Edition and ProComm Plus a AMI line code is selected Provision terminal port as follows eee i desd d Installation Code IC A Data Rate 19 2 kbps ETOS M EREE Telecommunication Co
6. with the higher measurement A TDR is typically required to locate this splice Troubleshooting Guide for repair m Excessively long bridged taps can also cause errors Check the records and or use a TDR to verify the The HTU C DSX LED is Flashing but no Errors are Indicated by the HTU R location and length of bridged taps a A BPV Frame Error SF or CRC Error ESF has been detected at the DSX 1 interface Possible network m Using ADTRAN s Performance History screen it is often possible to see that many more errors or wiring problem between the HTU C and the DSX This is not an indication of problems on the are being received on a particular loop or at a particular unit The fault will typically be very close HDSL loops to the unit receiving the most errors The HTU R DS1 LED is Flashing but no Errors are Indicated by the HTU C No Power at the HTU R m A BPV Frame Error SF or CRC Error ESF has been detected at the DS1 interface This indicates a m This could be caused by a loop with two open conductors Measure t r resistance from the MDF wiring problem or a B8ZS AMI mismatch between the HTU R and the customer equipment This to the HTU R or use the voltage chart to see which pair is open is not an indication of problems on the HDSL loops Check the HV LV option on the HTU C and re option if necessary
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