ATT System 25 Maintenance Manual

ERROR LOG
DC Power Failed: Indicates the absence of +5 V dc on a cabinet. Each
cabinet has its own power supply; therefore, this may not cause a Warm
Start.
DC Power Restored: Indicates that +5 V dc has been restored. The DC Fail
Check log is removed. This message keeps a record of dc hits. It is
possible to produce this error when a CP is inserted into a slot with power
On.
Down-Link Buffer Overflow: Software problem. Down-link buffer receiving
messages too fast.
DPR/Arch Angel Interface Test...

ERROR LOG
Electronic Power Feed Test Overload: The M lead on a tie trunk has an
external short circuit.
Empty CSMA Queue: (STARLAN Interface CP) This error resets the CP. If
the reset is successful, then the error is transient and recoverable. If the
reset fails, then the CP should be checked.
Error Log Table Full: Remove entries from the Transient Error Log to free-up
space.
External RAM Failure: Port CP or Call Processor error while running
background non-destructive external RAM tests. Check...

ERROR LOG
Illegal Port Interrupt: (STARLAN Interface CP) This error is an isolated
transient condition that is normally recoverable. If this error occurs too
frequently, a permanent alarm will be generated and the CP should be
checked.
Internal RAM Failure: Port CP or Call Processor error while running
background non-destructive internal RAM tests. Check port or Call
Processor CP.
Internal Sanity Timeout: (STARLAN Interface CP) This error resets the CP.
If the reset is successful, then the error is...

ERROR LOG
Message Corruption: (Other than CPU or Memory) Down-link message
checksum error. If consistent error for particular port CP—check TDM bus
drivers on the CP. If error is associated with many CPs—drivers on CPU
may be bad. Also check TDM bus terminators.
Message From Non-Translated Port: The port CP sent an up-link message.
Translate the CP and its port or remove the CP.
No Channel Buffer: (STARLAN Interface CP) This error is an isolated
transient condition that is normally recoverable.
No...

ERROR LOG
Physical and Logical Type Mismatch: (Other than CPU or Memory) Port CP
plugged into wrong slot; change translations for slot.
Port Board In Unadministered Slot: (Other than CPU or Memory) Port CP
inserted into a slot that is not translated, or inserted into wrong slot.
Port Board Missing But Administered: (Other than CPU or Memory)
Translated port CP that CPU cannot access. Check CP slot; reseat CP;
change CP; or remove CP from translations.
Port Board Out Of Service: (Other than CPU or Memory)...

ERROR LOG
Received Incorrect Number Of DID Digits: This error indicates that the CO is
set up to send a different number of DID digits than the switch has been
administered to receive.
ROM Checksum Failure: ROM checksum test has failed. Replace the CPU.
Ringing Without Ground: Tip and ring on Ground Start port circuit may be
reversed or may be CP problem. Also, CO may not be able to send ground.
Service Circuit In Mismatched Slot: Service Circuit in slot translated for
other type CP; two Service Circuits...

ERROR LOG
Translation Memory Test Failed: Memory translation checksum test failed.
Reload translations from tape; check CPU; check if Cold Start error has
occurred as a result of power failure problems.
Trunk Call Dropped: A call that had been up on a trunk for more than 9
hours has been detected by an audit and dropped. The port associated with
the error identifies the trunk in question.
Trunk Call Too Long: An audit found a call that had been up on a trunk for
more than 5 hours and logged this error to...

OPERATING THE DIGITAL TAPE UNIT
The Model DC4 Digital Tape Unit (DTU) or equivalent is extremely important
in system maintenance. The DTU is used to store system translations, in the
unlikely event that translations are lost in a system failure.
This section covers the following:
l
l
l
lSetting up the DTU
Saving Translations
Verifying Translations
Restoring Translations.
Setting up the DTU
The DTU must be properly connected to the system before it can be used.
Refer to the Installation and Test Manual...

OPERATING THE DIGITAL TAPE UNIT
Note:The system automatically compensates for the clear leader
material at the beginning and end of the tape.
Saving Translations
Follow these steps to save translations on tape:
1.
2.
3.
4.
5.
6.
7.
Complete the steps in the preceding Setting up the DTU section.
Press both the RECORD and PLAY buttons simultaneously. (The unit
should not yet begin to run.)
Log on to the SAT, if not yet logged on.
The system displays the main menu prompt:
Make one selection from menu ->....

OPERATING THE DIGITAL TAPE UNIT
8.Press the STOP/EJECT button on the unit.
9.Press the REWIND button and rewind the tape fully.
10.Verify the translations saved on the tape, following the steps in the
next section.
Verifying Translations
Always verify the translations saved to tape because of the possibility of
faults with cassettes or equipment. Successful completion of the Verify
function assures that saved translations match exactly the translations in the
system.
CAUTION: Performing the Verify...