Chapter 5 - Troubleshooting and Diagnostics HCD-E1
Installation & Operation Manual
5-6 Status Indications and Alarms 01/01/01 08:15
Table 5-1 HCD-E1 Alarm Buffer Messages (Cont.)
LCD Message Terminal Message Alarm
Number
Cause Corrective Actions Alarm
Type
FALLBACK CLK USE* CLOCK WAS
CHANGED TO
FALLBACK*
47 HCD-E1 switched to the fallback
clock source, because the master
clock source failed.
Check the master clock source. A clock source
(recovered from CH1, or CH2, or SL) is replaced as a
result of failure under the following conditions:
• CH1, CH2 - fails when data channel equipment is
disconnected or inoperative (DTR line not asserted)
• SL - fails when the E1 sublink loses frame
synchronization
ON
FRAME SLIP: SL FRAME SLIP: SL 04 A frame slip occurred on the E1
sublink.
1. Check the clock source selection.
2. Check the clock source stability at far end of the
E1 link.
3. Perform the power-up self-test and replace
HCD-E1 if it fails the test.
ON
HARDWARE
FAILURE*
HARDWARE
FAILURE*
18 HCD-E1 technical failure (failure
of one of the internal
programmable components). This
message can appear only upon
power-up.
Replace HCD-E1. ON
INTERNAL CLK USE CLOCK WAS
CHANGED TO
INTERNAL
24 HCD-E1 configured as central
switched to the internal clock
source, because both the master
and the fallback clock sources
failed.
1. Check the two clock sources.
2. Perform the power-up self-test and replace
HCD-E1 if it fails the test.
ON/OFF