Maintenance-Object Repair Procedures
555-233-143
8-1698 Issue 1 May 2002
TTR-LEV (TTR Level)
TN748 and TN420 Tone Detector circuit packs and TN744 Call Classifier circuit
packs provide tone receivers for detecting various types of signaling tones. These
circuit packs are shared resources that serve every user of the PBX. This
discussion uses the following terms and abbreviations (note that the
maintenance-related system parameters form uses different names than the
alarm and error logs):
TN748s and TN420s each have 4 DTMR-PTs and 2 GPTD-PTs. DTMR-PTs
interpret dual-tone multifrequency (DTMF) calling signals and translate them into
logical digits 0 through 9, *, and #. GPTD-PTs detect call-progress tones, modem
answer tones, and transmission test tones.
TN744 Call Classifier circuit packs have 8 CLSFY-PTs. These ports detect DTMF
tones and classify network and MFC (multifrequency compelled) signaling tones.
(That is, CLSFY-PTs can function as DTMR-PTs or GPTD-PTs, and have other
additional capacities).
MO’s Name (in
Alarm Log)
Alarm
Level Initial Command to Run Full Name of MO
TTR-LEV WARNING
1
1. See Repair Procedure for the TTR-LEV below.
TTR Level
TTR-LEV MINOR
1
TTR Level
TTR-LEV MAJOR
1
TTR Level
Type of Tone
Receiver MO
Also Known
As
Alternate
Abbreviation Location
Dual-Tone
Multifrequency
Tone Receiver
DTMR-PT Touch-Tone
Receiver
TTR 4 per
TN420/TN748
General-Purpose
Tone Detector
GPTD-PT Call-Progress
Tone Receiver
CPTR 2 per
TN420/TN748
Call Classifier CLSFY-PT CCTR 8 per TN744
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