ADTRAN DDM+ HTU-C M User's Manual
Contents
1. ADRAN DDM HTU CM CLEI TIL3BWBA_ _ HTU C 1246003L8 SELECT d STATUS CAUTION SUBJECT TO ELECTROSTATIC DAMAGE OR DECREASE IN RELIABILITY HANDLING PRECAUTIONS REQUIRED DDM HTU CM LED STATUS STATUS GREEN Synchronization FLASHING ES SES or BPV detected YELLOW _ Loopbacks active FLASHING In band loopbacks armed RED Alarm on any HTU C loops HRE loops DSX or DS1 interface FLASHING Signal Quality of 0 or No Sync on at least one loop 4 CHARACTER DISPLAY FCD OPERATION MODE UP MODE CENTER OFF DOWN SELECT SELECT FCD Modes Mode TES EY Function Status STAT HDSL loop marain displays 1 xx or 2 xx where xx loop margin 0 2 marginal signal quality 3 20 acceptable signal quality Display Off Blank Result after five minutes of no activity View VIEW View current parameters without changing Provisioning PROV Set configuration options Default DFLT Sets all factory defaults Loopback LPBK Select and execute HDSL circuit loopbacks Status Alarm Display STAT Message Condition HER1 CRC error detected on HDSL Loop 1 HER2 CRC error detected on HDSL Loop 2 LERR Frame bit error SF Mode or CRC error ESF Mode detected locally at DSX 1 of the HTU C RERR Frame bit error SF Mode or CRC error ESF Mode detected locally at DS 1 of the HTU C LBPV Bipolar Violation BPV detected locally at DSX 1 of the HTU C RBPV BPV detected locally at DS 1 of the2. E No active loopback HRE2 NET Network loopback at HRE2 CST Customer loopback at HRE2 NONE No active loopback WARRANTY Carrier Network products manufactured by ADTRAN and supplied under Buyer s order for use in the U S is ten 10 years For a complete copy of ADTRAN s U S Carrier Network Equipment Warranty 877 457 5007 Document 414 COMPLIANCE CODES This product is intended for installation in restricted access locations only and in equipment with a Type B or E installation code Input current at maximum load is 0 7 A at 48 VDC Maximum output at over current condition is 165 mA at 190 VDC CODE IN OUT Installation Code IC A Telecommunication Code TC X Power Code PC F C W For a complete Installation and Maintenance Practice 877 457 5007 Document 455 Please have your fax number available i TURN UP amp TROUBLESHOOTING GUIDE Maximum Loss Data dB Frequency kHz PRICING AND AVAILABILITY 800 827 0807 TECHNICAL SUPPORT 800 923 8726 RETURN FOR REPAIR 256 963 8722 www adtran com 10000 15 00 50000 25 50 100000 30 00 150000 32 75 196000 35 00 E z i 900000 35 25 t t Voltage t t Voltage t t Voltage t t Voltage t t Voltage t t Voltage 950000 37 50 Circuit with 2 HREs open at frame 185 190 N A N A N A N A N A 395000 42 00 Circuit with 0 or 1 HRE open at frame 145 150 N A N A N A N A N A HTU C HTU R 145 150 145 150 130 145 N A N A 125 130 pica ace ha
3. HTU R LOS1 No synchronization of HTU C and HTU R on Loop 1 LOS2 No synchronization of HTU C and HTU R on Loop 2 LLOS DSX signal is absent from the network interface or is of a format which does not match the provisioning of the HDSL circuit RLOS DS1 signal is absent from the network interface or is of a format which does not match the provisioning of the HDSL circuit ARM The loopback arming sequence has been detected JOBAID 61246003L8 22B 0006 HTU R Options Display VIEW Message Description Settings Default TXLV DS1 Transmit Level 0 dB 15 dB 0 dB PRM Performance Reporting Messages NPRM SPRM None None Parameter Settings Display PROV Message Description Settings Default LBO DSX 1 Transmit Level 0 133 266 399 533 0 CODE Line Code AMI B8ZS B8ZS FRMG DSX 1 Framing AUTO ESF SF UNF FFFC ESF NELB New England 1 6 loopback EN DIS DIS NLBK NIU Loopback EN DIS EN LBTO Loopback Timeout 0 120 120 CLOS Customer Loss Response AIS LPBK CDI AIS LTCH Latching Loopback T1 FT1 T1 SPWR Span Power ON OFF ON SALM Shelf Alarm EN DIS EN Loopback Options Display LPBK Mode Select Loopback State Loopback Description LPBK HTUC Net Network loopback at HTU C CST Customer loopback at HTU C NONE No active loopback HTUR BLB Bilateral loopback at HTU R NET Network loopback at HTU R CST Customer loopback at HTU R NONE No active loopback HRE1 NET Network loopback at HRE1 CST Customer loopback at HRE1 NON
4. d As with other circuits standard resistance measurements between each conductor and ground should also be used to test for a grounded conductor A high resistance open which degrades to the point that it causes the circuit to lose sync can be resealed by reseating the HTU C Test the cable pairs before reseating the HTU C Running Excessive Errors on the Loop 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 loop with the higher measurement A TDR is typically required to locate this splice for repair Excessively long bridged taps can also cause errors Check the records and or use a TDR to verify the location and length of bridged taps Using ADTRAN s Performance History screen it is often possible to see that many more errors are being received on a particular loop or at a particular unit The fault will typically be very close to the unit receiving the most errors No Power at the HTU R This could be caused by a loop with two open conductors Measure t r resistance from the MDF to the HTU R or use the voltage chart to see which pair is open
5. hiv aaa deseatnias eal HTU C HRE1 HTU R 130 135 110 135 110 135 N A N A 100 135 CAMPATE TP PCHLIDE SIETAN TELMO LELIA HOSS Ab HTU C HRE 2 HTU R 185 190 160 185 160 185 140 185 140 185 130 185 that frequency 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 Turn up Guide 1 Set option switches according to specific circuit design 2 Install HTU C and HTU R 3 The status LED should be green no alarm indications on the four character display FCD and synchronization has occurred a HTU C will display LLOS if not connected to network no DSX present LED will be solid red b HTU R will have red ALM LED if customer not connected LP1 LP2 line coding B8ZS or AMD and framing ESF or SF if not UNFR LEDs should be illuminated 4 If Status LED is green a Verify that the signal quality is the same on each loop Ensure signal quality indicators do not fluctuate b Verify that the loop loss is within design limits If there is a difference of more than 1 dB between the two loops a problem exists with the cable pairs c If errors occur use the Current System Status and Performance History screens to determine where they are occuring See Troubleshooting Guide 5 If everything checks out proceed with BERT testing Troubleshooting Guide The HTU C status LED is flashi
6. ng green and the FCD indicates LERR HER1 HER2 or LBPV but no errors are indicated by the HTU R A BPV Frame error SF or CRC error ESF has been detected at the DSX 1 interface Possible net work or wiring problem between the HTU C and the DSX This is not an indication of problems on the HDSL loops The HTU R DS1 LED is Flashing but no Errors are Indicated by the HTU C A BPV Frame Error SF or CRC Error ESF has been detected at the DS1 interface This indicates a wiring problem or a BBZS AMI mismatch between the HTU R and the customer equipment This is not an indication of problems on the HDSL loops 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 that are too long for HDSL synchronization Using a TIMS verify the circuit is within design limits 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 the field In the field measure t t and t r voltage with the HTU C installed and compare to the chart above If these voltages are not present open pairs or mis wiring is indicate
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