User manual

DEFINITY Enterprise Communications Server Release 6
Maintenance for R6vs/si
555-230-127
Issue 1
August 1997
Maintenance Object Repair Procedures
Page 10-482DS1-BD (DS1 Interface Circuit Pack)
10
l. BLB failure. This error occurs when the DS1 Board Loopback (BLB)
demand test fails. Repeat the test using the following commands:
busyout board PCSS, test ds1-loop PCSS ds1/csu-loopback-tests,
release board PCSS. 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 by the I-CSU
during I-CSU power-up/reset (i.e., TN767E board physically inserted and
120A1 CSU Module already installed) or when the 120A1 CSU Module is
plugged on to an already initialized DS1 board. The ELB test is also
executed as part of the command test ds1-loop PCSS
ds1/csu-loopback-tests.
Attempt to clear the alarm via the following commands: busyout board
PCSS, test ds1-loop PCSS ds1/csu-loopback-tests, and release board
PCSS. If the ELB test continues to fail, then either the TN767E board, the
CSU Module, or the I/O cable between the backplane and the CSU
module (or any combination thereof) has failed. Attempt to isolate where
the failure is occurring by re-executing the test by replacing one piece of
hardware at a time.
n. RLB failure. This error occurs when the Integrated CSU (I-CSU) Module
Repeater Loopback (RLB) test fails. This test is executed by the I-CSU
during I-CSU power-up/reset (i.e., TN767E board physically inserted and
120A1 CSU Module already installed) or when the 120A1 CSU Module is
plugged on to an already initialized DS1 board. The RLB test is also
executed as part of the command test ds1-loop PCSS
ds1/csu-loopback-tests.
Attempt to clear the alarm via the following commands: busyout board
PCSS, test ds1-loop PCSS ds1/csu-loopback-tests, and release board
PCSS. If the RLB test continues to fail, then the CSU Module needs to be
replaced.
o. CPE Loopback Jack deactivation error. This error occurs when the
TN767E circuit pack could not deactivate a CPE Loopback Jack
loopback.
Attempt to clear the alarm via the following commands: busyout board
PCSS, test ds1-loop PCSS end-loopback/span-test, and release board
PCSS. If the attempt to deactivate the CPE Loopback Jack loopback
continues to fail, other steps must be taken to deactivate the loopback.
p. Far CSU Loopback deactivation error. This error occurs when the TN767E
circuit pack could not deactivate a far-end CSU loopback on
power-up/reset or upon software request.
Attempt to clear the alarm via the following commands:
busyout board
PCSS
, test ds1-loop PCSS end-loopback/span-test , release board PCSS .
If the attempt to deactivate the Far CSU loopback continues to fail, then
escalate the problem.