DEFINITY ECS Release 8.2 Maintenance for R8.2csi
555-233-119 Issue 1
April 2000
Maintenance Objects
3-1159TTR-LEV (TTR Level)
3
TTR-LEV (TTR Level)
A TN2182 Tone-Clock/Detector/Call Classifier and the TN744D Call Classifier
circuit packs p rovide touch tone receivers (TTRs or DTMR-PTs) that are devices
used to interpret touch tone c alling signals and to translate the d ual tones into the
following valid dig its: 0 through 9, *, and #. A Tone Detector circuit p ack is a
resource shared by all PBX users and also has g eneral purpose tone detec tor
ports (GPTD-PTs) to detect call p rogress tones, modem answer tones, and
transmission test tones. Call Classifier Ports (CLSFY-PTs) have also been added
to detect voice or network in tercept 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 d igital or analog voice termin al on the switch, a
TTR is needed to interpret the dual tone multifrequenc y signals sent from the
voice terminal. The TTR is in use until the total number of digits ne eded is
collected or until a time-out occurs. Dial tone is supp lied to a user after receip t of
an off-hook signal which signi fies that a TTR is connected and ready to recei ve
digits. For example, if there are 20 TTRs in the system being used simultaneou sly
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 p revent delay in receiving d ial tone. The TTR-LEV
errors can be used to d etermine a shortage of tone detec tors. Use the list
measurements tone-receiver command to d etermine 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 rec eivers (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.
MO Name (in
Alarm Log) Alarm Level Initial Command to Run Full Name of MO
TTR-LEV WARNING See Note1
1. See the "Repair Procedure for the TTR Level Maintenance Object" section.
TTR Leve l