Avaya 03-300430 User Manual

Dual-Tone Multifrequency Receiver ports (DTMR), also known as Touch-Tone Receivers 
(TTRs), reside on the following circuit packs:

●

TN748

●

TN420

●

TN756

●

TN744B and TN744C

●

TN2182

●

TN2312AP

●

TN2312BP

There are four Dual-Tone Multifrequency Receiver (DTMR-PT) ports and two General Purpose 
Tone Detector (GPTD-PT) ports on the TN748, TN420 and TN756 Tone Detector packs. There 
are eight GPTD-PT ports on each TN744, TN2182 and TN2312AP circuit packs. The GPTD 
ports can be used for TTR, call progress tone detection, call prompting, MF signaling, dial tone 
detection, CO answer detection and OCM call classification. The DTMR port is used to detect 
touch-tone digits that are placed on the Time Division Multiplex (TDM) bus. Examples of 
touch-tone digits are digits 0 through 9, digit #, and digit *. The ability of the DTMR port to detect 
touch-tone digits is essential for maintenance of other circuit packs (for example, IPSI circuit 
pack) and in placing a station-to-station call. Calls originating from a hybrid station do not 
require a DTMR port.
The DTMR-PT MO implements a set of tests to ensure that detection of touch-tone digits by the 
DTMR port is functioning properly. For any Tone Detector circuit-level error (DETR-BD), see 

DTMR-PT

MAJ

test port location sh

Dual-Tone Multifrequency 

Receiver port (TTR)

DTMR-PT

MIN

test port location sh

Dual-Tone Multifrequency 

Receiver port (TTR)

DTMR-PT

WRN

Dual-Tone Multifrequency 

Receiver port (TTR)