Nortel Networks manual DCT1900 Network Signalling Summary

Technical Product Manual - DCT1900

System Description, System Overview

DCT1900	Signalling		Provides
System	Format to	Signalling Functionality
			Connection to
Type	Network
Standalone	Analog	Interface is over a 3Khz analog 2-wire connection.	PBX’s
		Basic signalling states such as on-hook, off-hook and
		ringing supported by voltage and current conditions
		on the line.
Standalone	Digital	Digital line interface over individual 2 wire connec-	PBX’s
		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.
Standalone	T1 CAS	Digital trunk interface operating at 1,544,000 bits per	PBX’s
		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.
Standalone	E1 CAS	Digital trunk interface operation at 2,048,000 bits per	Ericsson MD110
		second supplying 30 voice channels per circuit.	proprietary
		There are 2 circuits per board for a total of 60 voice
		channels. E1 circuits use ISDN type protocol.
Mobility	T1 CCS or	Interface over a T1 line at 1,544,000 bps or an E1	Mobility Server
	E1 CCS	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

2-2	System-DCT1900/R8/mw
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