Dialogic PCI Linecard Installation and Replacement
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Aug 2001 Ericsson Enterprise AB
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Testing and Troubleshooting T-1 Equipment
If you encounter problems with T-1 equipment, we recommend segmenting the test
procedure, which entails disconnecting all components and testing them individually.
This section contains procedures for testing or troubleshooting the following components:
•
The D/240PCI-T1
•
The CSU
•
The D/240PCI-T1–to–CSU and the CSU–to–T-1 connections
To test the D/240PCI-T1:
1.
Remove the plug from the RJ-45/48C connector on the back of the D/240PCI-T1.
2.
Plug a loopback plug into the RJ-48C connector of the D/240PCI-T1 (refer to “The
Loopback Plug” for additional information).
3.
Switch the loopback test switch SW500 to the Off or Loopback Mode position (refer
to “The Remote Loopback Switch (SW500)” for details).
4.
Choose one:
If the green LED at the back of the
D/240PCI-T1 linecard is...
Then…
Lit
Continue to the procedure for testing the
CSU.
Not lit
Verify that you have performed the
procedures in this document correctly.
The Loopback Plug
You can purchase a loopback plug or build one. To build a loopback plug, cross-connect
pins 1–4 and 2–5 on a linecord, as shown in Figure 14.
Figure 14. Loopback plug cross connections
RCV_RING
RCV_TIP
CHASSIS GROUND
XMIT_RING
XMIT_TIP
CHASSIS GROUND
CHASSIS GROUND
CHASSIS GROUND
1
2
3
4
5
6
7
8
