ADTRAN DS3 MX User's Manual
Contents
1. For a complete Installation and Maintenance 877 457 5007 Document 317 Please have your fax number available Hi DS3 MUX TROUBLESHOOTING PRICING AND AVAILABILITY 800 827 0807 TECHNICAL SUPPORT 800 726 8663 RETURN FOR REPAIR 256 963 8722 www adtran com LOOPBACK INFORMATION External Coax DS3 Loopbacks Two types of External Coax DS3 loopbacks can be used to isolate trouble and verify proper DS3 data path operation For accurate isolation this type of loopback is preferred over the menu selected loop backs since it checks the entire signal path and isolates the equipment at each end An external coax loopback cannot reliably be done if the total length of coax exceeds 900 feet Both of these types of loopback disrupt normal traffic on the coax E An External Coax DS3 Local Loopback can be performed to verify proper DS3 Mux data operation by looping the DS3 transmit output to the DS3 receive input either locally with a short coax or at the DS3 cross connect The Line Build Out option should be set to Short for a total coax length of 0 225 feet and Long for 226 900 feet The clock source must be local for a coaxial loopback Verify that the STATUS LED turns GREEN after about ten seconds The Status menu should show that the DS3 TX and RX Status is NORMAL Also zero errors should be seen in the first 15 minute column of the DS3 Qrtr Hourly report under the Performance Monitoring menu Select Reset Performance Registers if2. OFF and Power LEDs of all other cards in shelf are ON m 48V fuse on Mux is blown 1 Replace the Mux Fuse is not field replacable 3 POWER LED is ON YELLOW Status LED is OFF and Mux does not pass traffic m Muxis provisioned for OOS Unassigned 1 Provision Mux to be In Service 4 No alarms are ON in Mux and it does not pass traffic m The DS3 channels are not mapped to access card slots 1 Provision each channel to the desired slot 5 LEDs do not turn ON when pushing Test Enable button m There is an equipment fault 1 If Mux is still On line force switch to the other Mux 2 Momentarily unseat and reseat the Mux to clear trouble 3 Replace Mux if trouble persists 6 Status LED is ON RED in Mux A and B and Status menu shows DS3 RX LOS m DS3 receive signal is not present Check for correct RX coax connection Ensure TX and RX coaxes are not reversed Check for faulty coax or coax connector Check far end equipment for proper TX signal Perform External Coax DS3 Line Loopback Perform an External Coax DS3 Local Loopback to verify that Mux units and shelf are OK 7 STATUS LED is on red in Mux A and B and Status menu shows DS3 RX OOF m Receive DS3 signal is present but valid DS3 framing is not being received 1 Check for correct TX LBO setting on far end equipment 2 Check far end equipment for proper TX signal Perform External Coax DS3 Line Loopback 3 Perform an External Coax DS3 Local Loopback to verify
3. EIG Dwnld Prov e INSTALLATION PROCEDURE Pae SENEE een into Unit on Fault A E N Ensure the TA 3000 system chassis is properly mounted and wired for power BNC Adapter 00S Un N y N N AIS IDLE y y y Module P N 118100411 is required for DS3 operation The adapter is mounted to connector J34 J20 on 19 shelf located in the lower right corner of the backplane 00S Ma N V Mi Y Norm Norm Y y y Ensure SCU is seated and receiving power In Service Y Y Y Y Norm Norm N N N m Plug DS3 module into slot A or B of system chassis Gently but firmly push the DS3 Mux into one of the Mux slots A or B at the left end of the shelf Simultaneous thumb pressure at the m Linked Provisioning when enabled automatically transfers provisioning changes made to the a top above the POWER LED and bottom below the Test Enable button of the unit will enabled unit to the other unit ensure a good seat of the DS3 pins into the backplane connector Push the ejector tab up and Line Code this value is hardcoded to B3ZS and cannot be changed w J closed against the DS3 faceplate m Allow the self test LED sequence to complete The self test should take about 40 seconds Upon completion the POWER LED will be YELLOW indicating the unit is Out of Service and the STATUS LED will be OFF indicating the unit is in the Unassigned OOS UA state CAUTION SUBJECT TO ELECTROSTATIC DAMAGE OR DECREASE IN RELIABILITY HANDLING PRECAUTIONS REQUIRED
4. JOBAID 61181020L1 22A 0008 DS3 MUX DS3 MX PROVISIONING THE DS3 MULTIPLEXER STATUS LEDs CLEI M3CMSPOE_ _ POWER OFF No power is present on the unit To provision the DS3 Mux connect a terminal emulator via the RS 232 DB 9 connector on the faceplate YELLOW Unit is Out of Service of the SCU The terminal must be VT 100 or compatible and set for 9600 bps 8 data bits no parity and 1 stop bit ADRAR GREEN Unit is In Service m Atthe LOGON screen enter the system password Note the default password is PASSWORD case D S3MX STATUS OFF Unit is Out of Service Unassigned sensitive and can be changed upon initial login GREEN DS3 signal is present and synchronized m Select Common A or Common B from the Total Access Menu peroo RED Local alarm or local and remote alarm condition detected m Select option 2 Provisioning and press lt enter gt POWER YELLOW Remote alarm condition detected The following table lists the provisioning settings and their default values TEST O OFF Unit is not in loopback z 7 STATUS YELLOW Loopback active Options Settings Default LOCKOUT O OFF APS enabled Framing M13 C Bit Auto detect Auto detect TEST YELLOW APS disabled due to INHIBIT oeu oi Short Long Short RED APS is locked out due to three non forced APS events within a Clock Source Local Loop Loop 24 hour period Service State In Service O0S Unassigned 00S Maint 00S Unassigned ONLINE OFF Un
5. d DS3 TX output 2 Unseat and reset the now Off line mux 3 Force the Off line Mux back On line and see if the trouble clears 4 Replace Mux if trouble persists m Check to ensure the clock source is not identical at both ends i e both ends set to Local or both ends set to Loop 11 DS3 PM errors occurring and or DS3 status indicates OOF Check to ensure the clock source is not identical at both ends i e both ends set to Local or both ends set to Loop 1 Change clock source to loop if the current clock source is local or vice versa COMPLIANCE REQUIREMENTS m This product is intended for installation in a restricted access location in a Type B or E enclosure only CODE INPUT OUTPUT Power Code PC F G Telcommunication Code TC Zi Installation Code IC A WARRANTY Warranty for Carrier Networks products manufactured by ADTRAN and sup plied under Buyer s order for use in the U S is ten 10 years For a complete copy of ADTRAN s U S Carrier Networks Equipment Warranty statement call 877 457 5007 Document 414
6. it is stand by unit unit receives from network but does not Linked Provisioning Enabled Disabled Enabled transmit to network Line Code B3ZS cannot be changed B3ZS GREEN Unit is on line unit unit receives from and transmits to network m Framing sets the DS3 framing APS PUSHBUTTON Line Build Out set LBO to either Short or Long Short cable length is less than 225 feet of 734A or equivalent coaxial cable or less than 100 feet of Lucent 735 or equivalent coaxial cable Long cable length is greater than 225 feet of 734A or equivalent coaxial cable or greater than 100 feet of Lucent 735 or equivalent coaxial cable m Clock Source selects where the transmit clock derives its timing Local derives its clock from an on board oscillator Loop derives its clock from the incoming DS3 data stream m Service States the following table lists the operations allowed in each state m When depressed simultaneously with the Test Enable switch on the Off line unit a protection switch is forced m When depressed with the Test Enable switch on the On line unit it toggles APS status LOCKOUT ONLINE r TEST ENABLE BUTTON m When depressed alone tests all unit LEDs multicolor LEDs appear YELLOW m When depressed simultaneously with the APS switch on the Off line unit a protection switch TEST is forced Service Report Report Switch to Allow Trib Ntwrk Allow Allow ENABLE State Alarms TL1 PM Provide Forced DELCI M
7. necessary to clear previously reported errors E An External Coax DS3 Line Loopback can be performed to verify proper far end equipment DS3 data operation by looping the DS3 transmit coax from the far end to the receive coax either locally near the Total Access shelf or at the DS3 cross connect The far end clock source must be local for a coaxial loop back The far end equipment Line Build Out option must be set for the length of coax present The far end equipment must be checked for receive DS3 signal status and no errors Menu Selected DS3 Loopbacks E A Mux Menu Selected DS3 Line Loopback can be used to verify that the far end equipment can talk to itself over the entire length of coax with the ON LINE Mux receiving and then re transmitting the same data All loopbacks will disrupt any normal traffic on the coax The DS3 receive line interface unit per forms this loopback It performs receive clock and data recovery and B3ZS decoding encoding before re transmitting the data E A Mux Menu Selected DS3 Local Loopback should not be used to verify the DS3 data path since it does not test the entire DS3 data path A Local Loopback should be used only to internally loopback the DS3 signal on the Mux to verify Access card T2 E1 T1 data paths TROUBLESHOOTING INFORMATION 1 POWER LED ON RED continuously m Equipment fault 1 Momentarily unseat and then reseat the Mux to clear LED 2 Replace Mux if trouble persists 2 POWER LED
8. that Mux units and shelf are OK 4 Ensure framing format for both units is the same Check to ensure the clock source is not identical at both ends i e both ends set to Local or both ends set to Loop 8 Status LED is ON RED in one Mux only OR No alarm LEDs on in either Mux but receive DS3 PM errors occur on one Mux m Faulty Mux DS3 receiver 1 If this Mux is still ON LINE force a protection switch to the other Mux 2 Momentarily unplug and then plug in Mux to see if trouble clears 3 Replace Mux if trouble persists ja w N e _TROUBLESHOOTING CONT 9 No alarms are active in either Mux but receive DS3 PM errors occur in both Mux units m Marginal DS3 receive signal 1 Check for correct TX LBO setting on far end equipment m Total length of coax cable gt 900 feet 728A or 734A 1 Reduce cable length to lt 900 feet m AC current is flowing in RX coax shield due to a frame ground potential difference at ends of cable 1 Improve grounding or isolate one end of coax shield from frame ground m Check to ensure the clock source is not identical at both ends i e both ends set to Local or both ends set to Loop 10 Status LED is ON YELLOW in one or both Mux units m Marginal DS3 receive signal at far end equipment 1 Check for correct TX LBO setting on both Mux units m Far end s receive DS3 signal is bad 1 Force a Mux protection switch If the trouble clears the Mux which is now Off line has a ba
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