Tadiran Telecom Coral IPx Office, Руководство по установке и аппаратным средствам, Страница: 357 / 510

Coral IPx Office Installation Manual Shared Service Cards
9-45
DTMF Receiver (DTR)
9
9.6
DTMF Receiver (DTR)
0
The U-RMI Office and U-MR Office cards provide 24 (max: 24*) port DTMF
receivers and decoders for touch-tone digits.
Separate authorization is required to allocate the DTMF circuits supported
by the U-RMI Office and U-MR Office cards.
(max: *)
The max. number is dependent on the number of URC resource
points.
The U-RMI Office and U-MR Office cards include the DTR circuits. The DTR
provides up to 24 circuits, which receive and decode Dual Tone Multi-Frequency
(DTMF) dialing tones. The DTR is required to support telephone station apparatus or
trunks that send DTMF tones to the Coral IPx Office system to activate system
features or select other ports.
DTMF signalling is commonly used by industry standard, single line telephone (SLT)
sets, as well as E&M tie trunks and Direct Inward Dialing (DID) central office trunks.
Loop-start and ground-start central office trunks, which are defined in the system
database as IRSS (Freedom) or DISA, require a DTR to be installed in the system.
The DTR uses industry standard DTMF receiver circuitry to decode DTMF dialing
tones. The audio side of each DTMF receiver circuit is directly coupled through a
CODEC to the Pulse Code Modulation (PCM) switching matrix of the Coral
IPx Office system. Decoded digital data is passed through the peripheral bus to the
system processor.
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1 General Description