Ttr-Lev (Ttr Level) - Avaya DEFINITY Server CSI Maintenance Manual

TTR-LEV (TTR Level)

TTR-LEV (TTR Level)
MO Name (in
Alarm Log)
TTR-LEV
1. See the "Repair Procedure for the TTR Level Maintenance Object" section.
A TN2182 Tone-Clock/Detector/Call Classifier and the TN744D Call Classifier
circuit packs provide touch tone receivers (TTRs or DTMR-PTs) that are devices
used to interpret touch tone calling signals and to translate the dual tones into the
following valid digits: 0 through 9, *, and #. A Tone Detector circuit pack is a
resource shared by all PBX users and also has general purpose tone detector
ports (GPTD-PTs) to detect call progress tones, modem answer tones, and
transmission test tones. Call Classifier Ports (CLSFY-PTs) have also been added
to detect voice or network intercept tones. A Call Classifier Port (CLSFY-PT) can
function as either a DTMR-PT or as a GPTD-PT.
When a user places a call from a digital or analog voice terminal on the switch, a
TTR is needed to interpret the dual tone multifrequency signals sent from the
voice terminal. The TTR is in use until the total number of digits needed is
collected or until a time-out occurs. Dial tone is supplied to a user after receipt of
an off-hook signal which signifies that a TTR is connected and ready to receive
digits. For example, if there are 20 TTRs in the system being used simultaneously
by 20 users at a given time, then the 21st user would not receive dial tone until a
TTR becomes available. It is for this reason that it is necessary to have sufficient
tone detectors in the system to prevent delay in receiving dial tone. The TTR-LEV
errors can be used to determine a shortage of tone detectors. Use the list
measurements tone-receiver command to determine tone detector usage. The
minimum threshold values assigned on the Maintenance-Related System
Parameters Form for TTRs (DTMR-PTs), CPTRs (GPTD-PTs), and CCRs
(CLSFY-PTs) should match the number of touch tone receivers (TTR) and tone
detectors (GPTD-PT) in the system. The numbers are 8 CCRs for each Call
Classifier Port (TN744D) circuit pack. The threshold values are administered via
the change system-parameters maintenance command on the
Maintenance-Related System Parameters Form. The desired numbers are
entered in the "TTR" (DTMR-PT), "CPTR" (GPTD-PT), and "Call Classifier"
(CLSFY-PT) fields, respectively.
The TTR Level (Touch Tone Receiver Level) MO is used to represent the following
possible events:
1. The total number of General Purpose Tone Detector Ports (GPTD-PTs),
[also known as Call Progress Tone Receivers (CPTRs)], currently in
service is less than the administered threshold number.
2. The total number of Dual Tone Multifrequency Receiver Ports (DTMR-PTs)
[(also known as Touch Tone Receiver (TTRs)], currently in service is less
than the administered threshold number.
555-233-119
Alarm Level Initial Command to Run
WARNING See Note
Full Name of MO
1
TTR Level
Issue 5 October 2002
1749