AT&T 3.0 manual Error Events, CSU Loopback Test

100D Module Problems

Error Events

In addition to checking the error logs, the 100D module requires that you check the error events specific to the 100D module. See "Error Events, ” later in this chapter, for details.

CSU Loopback Test

The Channel Service Unit (CSU) Loopback Test verifies that the communication path between the following CSUs, 551 T1, ESF T1, or the ACCULINK® 3150, and the 100D module is operational.

Summary

Console Procedure

PC Procedure

Appropriate Modules

Time Estimate

EQ IN and EQ OUT (551 T1 CSU)

DTE LOOPBACK (ESF T1 CSU)

LINE LOOPBACK

(ACCULINK 3150 CSU)

Busy-Out or Reset

Menu →Maintenance →Slot →Dial the slot no. →

Enter →CSU-1pbk

(F6) →(F2) →Type the slot no. →(F10) →(F4)

This test can be run only on 100D modules. Approximately 2 minutes

For the 551 T1 CSU only, connect a patch cord from the CSU EQ IN jack to the CSU EQ OUT jack. Details are provided below.

For the ESF T1 CSU only, flip the DTE LOOPBACK switch on the front paneI to the up position to activate the Ioopback. Details are provided below.

For the ACCULINK 3150 only, select front panel Line Loopback command. Details are provided below.

Prior to beginning the test, busy-out the 100D module. Both Busy-outand Reset are in the Slot menu, which you can access by doing the following from the console:

Menu → Maintenance → Slot.

See “Busy-Out and Reset,” earlier in this chapter, for additional information.

Control Unit Problems 4-71