Avaya 555-233-001 manual Digital interfaces, Isdn

ISDN	10 Networking
Miscellaneous trunks	Miscellaneous trunks perform functions that do not fit neatly into any of those already
	described:
	• Release-link trunks are used between switch locations to provide Centralized
	Attendant Service.
	• Remote-access trunks provide off-premises users with access to DEFINITY
	ONE’s features and networking.
Digital interfaces
	Avaya supports both T1 and E1 facilities. As industry standards around the world, T1
	and E1 facilities provide the latest alternative to analog trunking.
E1 interface	DEFINITY ONE supports E1 connections. T1/E1 access and conversion allows
	simultaneous connection to both T1 (1.544 Mbps) and E1 (2.048 Mbps) facilities
	(using separate circuit packs).
T1 interfaces	When planning your networking requirements, one of the options you should
	consider is multiplexing over Digital Services 1 (DS1) facilities. As the industry
	standard for interconnecting digital systems, DS1 is an economical alternative to
	analog trunking arrangements. Multiplexing up to 24 digitized voice/data
	communications paths onto a single T1 carrier or other high-speed digital facility
	(such as fibre or microwave) can reduce your network trunking and equipment costs.
	Used to connect switches to the public network or to other switches in a private
	network, DS1 also delivers high-speed, end-to-end digital connectivity. Voice and
	data calls are completed at transmission speeds of up to 64 Kbps.
	DEFINITY ONE offers several options in supporting the DS1 interface. The options
	include support for voice-grade DS1, alternate voice/data, and Digital Multiplexed
	Interface. The voice-grade DS1 interface is a T1 D4 channel-bank-compatible
	interface.
ISDN
	DEFINITY ONE provides complete ISDN support. ISDN eliminates the need for
	multiple, separate access arrangements for voice, data, facsimile, and video services
	and networks. Using inexpensive twisted copper, ISDN can deliver voice, data, and
	video services in digital format.
	ISDN is a global access standard established by the Consultative Committee for
	International Telephone and Telegraph designed to help you move and manage
	information with unprecedented ease and productivity — anywhere in the world.
	ISDN uses a layered protocol that conforms to layers one, two, and three (physical,
	link, and network layers) of the 7-layer Open Systems Interconnect Reference Model
	of the International Standards Organization.
	DEFINITY ONE supports the ISDN Primary Rate Interface, which is used for
	connecting premises equipment such as switches to the network and acts as a
	powerful interface between intelligent equipment such as switches and computers.
	However, trunk-side BRI is supported in countries that support the Euro-ISDN
	(ETSI) standards.
Overview
555-233-001 — Issue 2 — November 2000		10-9