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TTR-LEV (TTR Level)
Issue 1 June 2005 2371
Another alarm is logged if the number falls to zero. At this point, system operation is severely
compromised.
Typical causes of these events are:
1. The threshold for GPTD-PTs or DTMR-PTs is administered incorrectly on the
Maintenance-Related System-Parameters screen.
2. Too many GPTD-PTs, DTMR-PTs, or CLSFY-PTs have been taken out of service, possibly
by maintenance software or a demand busyout.
3. A tone detector circuit pack has been removed or suffered a fatal failure, resulting in the
loss of all its ports.
4. The system has an insufficient number of TN748/TN744/TN420 circuit packs.
Repair Procedure for TTR-LEV
To resolve a TTR-LEV alarm:
1. Enter display errors and use the TTR-LEV Error Log Table to determine which type of
tone receiver has fallen below its threshold.
2. Enter change system-parameters maintenance, and check the administered value.
On the screen, TTR represents DTMR-PTs, CPTR represents GPTD-PTs, and Call
Classifier represents CLSFY-PTs. If the threshold value is set too high, change it to a lower
value and wait a minute for the alarm to clear.
To determine the correct thresholds, first find the total number of TN478/TN420 Tone
Detector and TN744 Call Classifier circuit packs in the system using list
configuration. Then calculate the total number of tone receiver ports of each type. Each
Tone Detector circuit pack has 4 TTR (DTMR) ports and 2 CPTR (GPTD) ports. Each
TN744 Call Classifier circuit pack has 8 Call Classifier (CLSFY-PT) ports.
For each type of tone receiver, if the total number of ports installed in the system is less than
the administered threshold, either add more circuit packs to the system or reduce the
threshold to match the number already in the system. If the TTR Level alarm is still present,
proceed to Step 3.
3. Enter display errors for Error Type 18 and look for GPTD-PTs, DTMR-PTs, or
CLSFY-PTs that have been busied out.
For each of the busied-out ports:
a. Determine why the port was busied out.
b. If the port can be placed back into service, test the port using test port location.
c. If every test passes, enter release port and wait 1 minute for the TTR Level alarm to
clear.
If this does not clear the TTR Level alarm, proceed to Step 4.