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 Failed—CPU: CPU has failed the DPR/Arch
Angel Interface test. Check the CPU.
DSP Insane: Service Circuit or Tone Detector CP problem. Check and
replace CP as required. Error okay if on an audit pass a log of DSP sane
message occurs.
DSP Sane: See DSP Insane.
Dual Port RAM Read-Back Failure: Service Circuit dual port RAM problem.
Check CP and replace if required.
DUART Test Failed: Peripheral port on Call Processor CP has failed. Check
Call Processor CP.
DXS Console Reset: The DXS console has been reset. This will normally
happen when the console is plugged in, but it could also point to a potential
short circuit in the console.
Electronic Power Feed Off, Overcurrent: Probable short in cable interface to
Hybrid Line (ZTN79) port interface. Error removed if audit passed and short
removed.
Electronic Power Feed Overload: See Electronic Power Feed Off,
Overcurrent.
Electronic Power Feed Test No Load: External open circuit on a tie trunk.
6-7 
						

							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 appropriate CP.
External Stack Full: (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.
Frame Length Error: (STARLAN Interface CP) This error is an isolated
transient condition that is normally recoverable.
Generator DSP Insane: Service Circuit problem. Check CP and replace if
required. Error okay if on an audit pass a log of Generator DSP Sane
message occurs.
Generator DSP Sane: See Generator DSP Insane.
Ground But No Ringing: Incoming calls are okay, but a problem could exist
with the CO ringing generator or with the CPs ring detector. Check CP.
Illegal Instruction: This error is logged when an illegal instruction is
encountered by the CPU. The problem could be with the ROM on the CPU or
the Memory CP.
Illegal Interrupt: The Call Processor or Memory CP has a problem. The CPs
may still pass the powerup test for their ROMs. Replace Call Processor or
Memory CP.
Illegal LAN 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.
Illegal Port Command: (STARLAN Interface CP) This error is an isolated
transient condition that is normally recoverable.
6-8 
						

							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 transient and recoverable. If the
reset fails, then the CP should be checked.
Invalid Board Message: The port CP sent an up-link message that is not in
the expected message set. Replace the CP.
Invalid Bridge Mode: (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.
Invalid LAN Command: (STARLAN Interface CP) This error is an isolated
transient condition that is normally recoverable.
Invalid Message Length: The port CP sent an up-link message that is not in
the expected message set. Replace the CP.
Invalid Port Board: (Other than CPU or Memory) Port CP not supported by
system plugged into slot.
Invalid Port Message: The port CP sent an up-link message that is not in the
expected message set. Replace the CP.
LAN Protocol Error: (STARLAN Interface CP) This error is an isolated
transient condition that is normally recoverable. This error may be caused by
a defective endpoint on the STARLAN NETWORK.
Limited Default Cold Start: This is a cold start after which only a limited
amount of default translations have been made.
Memory Management Corruption: Software audit determined and corrected
memory management. If problem persists, replace Call Processor CP.
Memory Management Error: May be bus error. A Warm start is logged after
this error. Check CPU.
Memory ROM Checksum Error: Memory has failed the ROM test. Check
Memory CP.
6-9 
						

							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 External Release On PBX Disconnect: CO did not release within 4
minutes on DID trunk after System 25 disconnected. Message sent every 4
minutes until release. Message cleared from log if release occurs belatedly.
No Free Buffer: (STARLAN Interface CP) This error resets the CP. If the
reset is successful, then the error is transient and recoverable. This error
may be caused by a defective endpoint on the STARLAN NETWORK. If the
reset fails, then the CP should be checked.
No Loop Current On Incoming Call: Check port circuit. Also may be CO
problem. Swap CP with another similar CP. If problem stays at original slot,
likely CO or trunk problem.
No Loop Current On Outgoing Call: Test trunk circuit; swap CP with similar
CP. If problem moves, replace CP; otherwise, check with CO.
No Tip Ground Detected Outgoing: No CO ground detected in response to
an outgoing seizure. After this message is logged, an internal audit busies
out the offending port. Check system translations to insure that the port
should be active. Inform CO if trunk is good.
On-Hook Before Ready To Receive Digits: For a tie trunk with delay dial or
wink start—after the handshake is complete, there is a 50 ms guard time that
must pass before receiving digits. If the far end goes on-hook before guard
time elapses, this message is logged.
On-Hook Before Wink: For a tie trunk with delay dial or wink start—if the far
end goes on-hook (possibly indicating the beginning of a rotary dial digit)
before the wink handshake is completed, the error is logged. A disconnect
sequence is started and the call may be dropped.
On-hook During Wink: This error indicates that digits are being sent by the
far end before the switch is ready to receive them. The two switches are
probably not set up so that they are compatible to each other.
6-10 
						

							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) Message occurs
when a CP is removed from a cabinet. Error removed when the CP passes
powerup. Check port CP.
Port Board ROM Checksum Failure: The port CP has found that the
checksum on its firmware is bad. Try reseating the CP. If this error happens
again, then replace the CP.
Port Buffer Full: (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.
Port Fault: For an Auxiliary trunk, this message is logged when a ground is
expected from external equipment and is not detected.
Port Queue Full: (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.
Port Translation Audit Error: (Other than CPU or Memory) Check port CP
including CP translations.
Program Logic Inconsistent: (Other than CPU or Memory) Check port CP.
Protected Memory Access Error: Attempt to access memory without
permission. May be Memory or CPU problem. Restart may solve problem.
Queue Overflow: Message queue for task supervisor full; some messages
may have been lost.
RAM Test Failed: CPU has failed the RAM test. Check CPU.
Real Time Clock Test Failed: Replace CPU.
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							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 mounted in cabinet. Only one Service
Circuit (ZTN85) allowed per system. Additional tone detection available using
Tone Detector CP (TN748).
Service Circuit Test Failed: Service Circuit problem. Check CP and replace
if required. Also check TDM bus terminators.
Signaling Lead Fault: See Port Fault.
Slot Configuration Error: (STARLAN Interface CP) This error means that
another ZTN84 port CP is on the STARLAN NETWORK and has the same
physical address. This condition can be resolved by moving the ZTN84 port
CP to another slot in the carrier.
Software Error: Illegal address or bus error. Check CPU and Memory CPs.
Software Program Logic Inconsistent: Feature code has detected invalid
states. System may recover from this.
State Inconsistency: (Other than CPU or Memory) Attempt to set port CP to
invalid state. System may recover from this.
Switch-Hook Error: Station still on-hook although a ring trip was detected.
Could be a problem with ringing portion of cabinet power supply. Check CP
and ringing supply.
System Lock-Up: This error is logged by the task supervisor if, during
scheduling of tasks, no messages have been read for at least 60 seconds.
This would result in a restart of the system.
System Restart: System locked up in a software task. Possible software
error if system not warm or cold started on purpose. The Port Number
entry in the log is the task at fault.
6-12 
						

							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 alert the user of it. This error is
removed when a Trunk Call Dropped error is logged.
Unable To Send Downlink Message: Downlink message queue is full. This
means that messages to CPs may be lost. If this error happens at different
times, replace the Call Processor CP.
Unexpected Command: (STARLAN Interface CP) This error is an isolated
transient condition that is normally recoverable.
Unexpected 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.
Unrecognized Command: (STARLAN Interface CP) This error is an isolated
transient condition that is normally recoverable.
User Forced Cold Start: System was cold started via the SAT
User Forced Warm Start: System was warm started via the SAT.
Warm Start: System was restarted for some reason (CP unplugged, power
problem, or some other error). Translations okay. Power supply may be
running out of regulation, or may be Call Processor problem.
Wink Too Short For Valid Signal: For a delay dial or wink start outgoing
trunk, if the wink from the far end is less than the minimum 100 ms, this error
is generated and the tie trunk remains waiting for a valid signal.
Work Cycle Interrupt Test Failed: Work cycle interrupt problem. System
most likely is stopped. Try to Warm Start the system via the SAT. May also
correct by replacing Call Processor CP.
6-13 
						

							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 (555-520-100) for connection
information. The unit must be connected to ac power and turned on to
operate, although most of the control is exercised from the SAT.
The DTU must also be connected to the Call Processor. Normally, this
connection is made via Channel 3 in the octopus cable originating from the
Call Processor circuit pack. This connection should be verified, however, as
the channel can be reassigned from the SAT.
A high quality audio cassette tape should be used. Acceptable tapes are the
Maxell UD XL-II C60 or C90, the TDK SA C60 or C90, etc.
Before operating the DTU, always follow these steps:
1.
Press the STOP/EJECT button on the unit. (The plastic cover pops
up.)
2.Insert the cassette so the exposed portion of the tape faces the units
buttons. Press the cassette downward until it snaps into place.
3.Close the cover.
4.Press the REWIND button and wait for the unit to fully rewind the
tape. This step is necessary before proceeding to ensure that the
tape is played from the beginning.
7-1 
						

							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 ->.
Enter 9 for the SAVE/RESTORE selection.
The system responds with:
>Action=, Enter 1.
The system responds with:
Save/Restore: Action=1 Data=.
Enter D. The system completes the word Data followed by the =
sign.
Enter 1. The system responds with:
Save/Restore: Action=1 Data=1
W24: YOU ARE ABOUT TO START A TAPE SAVE
Keyboard input is blocked while doing tape operation
c to continue, any other key for abort
The tape unit is automatically started by the system. Saving
translations on tape takes about 5 minutes.
When the save is complete, the unit stops automatically.
If the save is successful, the SAT displays:
SAVE COMPLETED SUCCESSFULLY.
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							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 function takes about 5 minutes.
To verify translations saved to tape, follow these steps:
1.
2.
3.
4.
5.
6.
Complete the steps in the preceding Setting up the DTU section
unless Verify is being performed immediately after the Save function.
Press the PLAY button on the tape unit. (The unit should not yet
begin to run.)
Log on to the SAT, if not already logged on.
The system displays the main menu prompt:
Make one selection from menu ->.
Enter 9 for the SAVE/RESTORE selection.
The system responds with:
>Action=, Enter 2.
The system responds with:
Save/Restore: Action=2 Data=.
Enter D. The system completes the word Data followed by the =
sign.
7-3