Nortel DCT1900 Technical Product Manual page 24

Technical Product Manual - DCT1900
System Description, System Overview
DCT1900 Signalling
System Format to
Type Network
Standalone Analog
Standalone Digital
Standalone T1 CAS
Standalone E1 CAS
Mobility T1 CCS or
E1 CCS
2-2
Signalling Functionality
Interface is over a 3Khz analog 2-wire connection.
Basic signalling states such as on-hook, off-hook and
ringing supported by voltage and current conditions
on the line.
Digital line interface over individual 2 wire connec-
tions. Proprietary digital signal encoding, which con-
veys basic call information and additional call
information such as Calling Line Identifier, Call redi-
rection numbers, message waiting indicators, multi-
line operation, etc. There are 12 circuits per board
and each circuit carries one voice call.
Digital trunk interface operating at 1,544,000 bits per
second supplying 24 voice channels per circuit.
There are 2 circuits per board for a total of 48 voice
channels. Signalling is done via robbed bit signalling
with 2 bits per voice circuit encoding basic signalling
states such as on-hook, off-hook and ringing.
Digital trunk interface operation at 2,048,000 bits per
second supplying 30 voice channels per circuit.
There are 2 circuits per board for a total of 60 voice
channels. E1 circuits use ISDN type protocol.
Interface over a T1 line at 1,544,000 bps or an E1
line at 2,048,000 bps. One channel on the interface
is dedicated to a digital signalling protocol operating
at 64,000 bps. The digital signalling channel carries
an ISDN type protocol, which conveys basic call
information and additional call information such as
Calling Line Identifier, Call redirection numbers,
message waiting indicators, etc. Because the
signalling channel occupies one of the time slots on
the T1 or E1 interface, a T1 CCS trunk can carry 23
voice calls per circuit and an E1 CCS trunk can carry
30 voice calls per circuit. There are two circuits per
board.
Table 2-1 DCT1900 Network Signalling Summary
Provides
Connection to
PBX's
PBX's
PBX's
Ericsson MD110
proprietary
Mobility Server
System-DCT1900/R8/mw
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