Harris ACS-163, Руководство по установке и эксплуатации

Страница: 163 / 178

6-Testing & Troubleshooting ACS-160 Series & STL-160 Series T1 Mux Installation & Operation
Version 2.11, August 2011
Harris Corporation 6-19
Intraplex Products
• If nothing appears on the display, replace the CM-5RB module with a spare.
• If the wrong mode appears, correct the switch settings on the module adapter associated with
the CM-5RB module (Section 3.5 –
Module Adapters ).
4. Check that the TX OUT indicator light on the CM-5RB module is on. If this light is off, there is no
transmit activity on the module. Replace it with a spare.
5. Check that the multiplexer is “in frame” (has T1 frame synchronization). When a multiplexer is in
frame, the CM-5RB FRM indicator light is off.
6. If the FRM indicator light is on and the RX IN indicator light is off, there is no receive activity. In
that case, perform these steps:
a. Check the cabling between the multiplexer and the T1 service provider.
b. Check the equipment at the other end of the T1 circuit.
c. Call your T1 carrier to verify that the T1 circuit is operating.
d. If there is still no receive activity, the CM-5RB module might be bad. Replace it with a spare.
7. If both the FRM and the RX IN indicator lights are on, there is receive activity but no frame
synchronization. In that case, perform these steps:
a. Call your T1 carrier to find out what kind of frame format is in use on the T1 circuit. Make sure
that this format is set correctly on the multiplexers at both ends of the T1 circuit.
b. If the frame format is set correctly but the system is still out of frame, the CM-5RB module
might be bad. Replace it with a spare.
8. Verify the LPBK light is off; all the loopbacks should be off.
9. If the RX IN light is blinking, set the alphanumeric display to the BLNK group to determine the
cause. This display might also indicate that all the active channels in the system are sending data
that is almost all ones. Perform one of these steps, depending on the BLNK group display:
• If the display reads RxYI, the multiplexer is receiving a yellow alarm. Contact your T1 carrier
to resolve the problem.
• If the display reads Rx11, the multiplexer is receiving an all-ones signal, meaning that there
are no active channels in the system. Check the channel modules at each end of the circuit.
• If the display reads XsJt, there is severe jitter on the T1 circuit. Contact your T1 carrier to
resolve the problem.
10. If the ERR and/or the BPV indicator lights are blinking erratically, there are errors on the T1
circuit. In that case, perform these steps:
a. Call your T1 carrier to determine whether the circuit is set up to use B8ZS or AMI line coding.
b. Make sure that this format is set correctly on the multiplexers (and the CSUs, if present) at
both ends of the T1 circuit.
c. Check that the T1 connecting cables at each end of the circuit are properly shielded and are no
more than 150 feet (45.7 meters) long.
6.6.4 Power Supply Test
Perform these steps to test your power supply:
1. If the power supply does not appear to be functioning, remove it and check the fuse on the
supply.
2. If the fuse is bad, replace it with an identical type and reinsert the module.
3. If the fuse is good, use a VOM to test for correct voltages at the test points (Figure 6-12).
Warning! Point E9 is close to the edge of the card, especially on a 1RU shelf; be careful not to
let the test probe touch the chassis while testing this point.
Test point E12 is ground. The correct voltages are: