AT&T System 25 User Manual
Page 211
MAINTENANCE
ERROR MESSAGE
AND DESCRIPTION
POSSIBLE SOLUTION
D C
F a i l T r a n s i e n t Record:
No action required; this error
Indicates a dc power failure.
display is a record of the start
time of the failure.
DC Power
Failed:
Indicates the
Check the +5 V dc voltage level
absence of +5 V dc on a cabinet.
on the power supply (see Figure
Each cabinet has its own power
supply; therefore, this may not
cause a warm start.
DC Power Restored:
Indicates
It is possible to produce this error
that +5 V dc has been restored.
when a CP is inserted into a slot
The
“DC Fail Check”
log is
with power “On” (not a real
removed. This message keeps a
Problem).
record of dc “hits.”
Down Link Buffer Overflow:
T h e
Recoverable; no action required.
down-link
buffer is receiving
messages too fast.
DSP Insane:
Service Circuit or
If a " DSP Sane " occurred, the
Tone Detector CP problem.
system will remove this error from
the permanent alarm table. If the
problem
persists,
c h e c k o r
replace the faulty CP.
DSP Sane:
DSP recovered from
Recoverable; no action required.
an insane condition.
Dual Port RAM Read-Back Failure:
Check CP, and replace if required.
Service Circuit dual port RAM
problem.
WART Test Failed:
Peripheral This problem affects the tape,
port on CPU/Memory CP has
administration, maintenance and
f a i l e d .
SMDR ports.
If the problem
persists, replace the CPU/Memory
C P .