DS1-BD (DS1 Interface Circuit Pack)
Issue 1 May 2002
8-593555-233-143
j. DS1 configuration error. Attempting to use a 120A1 CSU with a TN767E
circuit pack that is configured for 32-channel (2.048-Mbps) operation. This
CSU only works with a DS1 board configured for 24-channel (1.544-Mbps)
operation in the United States of America.
k. DS1 circuit pack suffix incorrect for CSU or T1 sync splitter. The
Near-End CSU Type field on the add ds1 form has been administered
as integrated but the DS1 circuit pack is not a TN767E (or
higher-suffixed) DS1 board.
If the 120A1 CSU or T1 sync splitter is to be used, remove the circuit pack
and replace it with a TN767E (or higher-suffixed) board. Otherwise, use
the change ds1 command to change the Near-End CSU Type field to
other.
l. BLB failure. This error occurs when the DS1 Board Loopback (BLB)
demand test fails. Repeat the test using the following commands: busyout
board UUCSS, test ds1-loop UUCSS ds1/csu-loop-back jack-tests,
release board UUCSS. If the BLB test continues to fail, then the TN767E
circuit pack needs to be replaced.
m. ELB failure. This error occurs when the Integrated CSU (I-CSU) Module
Equipment Loopback (ELB) test fails. This test is executed during
I-CSU/T1 sync splitter power-up/reset (i.e., the TN767E board is physically
inserted and the CSU module/T1 sync splitter is already installed) or when
the CSU module/T1 sync splitter is plugged on to an already initialized DS1
board. The ELB test is also executed as part of the command test
ds1-loop UUCSS ds1/csu-loopback-tests.
Attempt to clear the alarm via the following commands: busyout board
UUCSS, test ds1-loop UUCSS ds1/csu-loopback-tests, and release
board UUCSS. If the ELB test continues to fail, then either the TN767E
board, the CSU module, the T1 sync splitter, or the I/O cable between the
backplane and the CSU module/T1 sync splitter (or any combination
thereof) has failed. Escalate this problem.
n. RLB failure. This error occurs when the Integrated CSU (I-CSU) Module
Repeater Loopback (RLB) test fails. This test is executed during I-CSU/T1
sync splitter power-up/reset (i.e., the TN767E board is physically inserted
and the CSU module/T1 sync splitter is already installed) or when the CSU
module/T1 sync splitter is plugged on to an already initialized DS1 board.
The RLB test is also executed as part of the command test ds1-loop
UUCSS ds1/csu-loopback-tests.
Attempt to clear the alarm via the following commands: busyout board
UUCSS, test ds1-loop UUCSS ds1/csu-loopback-tests, and release
board UUCSS. If the RLB test continues to fail, then the CSU module/T1
sync splitter needs to be replaced.
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