Cisco Systems 8600 Series manual AT3-6ME Interface Adapter, Application

A P P E N D I X D

AT3-6ME Interface Adapter

This appendix describes the AT3-6ME Interface Adapter, sometimes referred to as the T3-T2

Interface Adapter, that is used with the BPX switch to provide a 6 Mbps ATM network interface to

T2 transmission facilities.

Application

The AT3-6ME Interface Adapter is used with the BPX Broadband ATM Switch or the IPX Narrowband Switch in applications where it is required to interface a 6 Mbps T2 digital network facility to the 45 Mbps T3 ATM port on the BPX, IGX, or IPX node.

Applications include networks where T2 transmission facilities are available. Users with ATM networks who require somewhat more bandwidth than is provided by the T1 or E1 ATM network connections but do not need the full T3 bandwidth provided by the BPX ATM network ports can also benefit from using the AT3-6ME Interface Adapter. See Figure D-1for a typical application.

Figure D-1		Network Application
			T2 network trunk			T2 network trunk
	BPX/IGX
			AT3-6M		Network		AT3-6M
	ATM interface
			adapter				adapter
	UNI or NNI
	T3 ATM interface			T2 interface
				ATM UNI standard

BPX/IGX

ATM interface

UNI or NNI

H8186

General Description

The AT3-6ME Interface Adapter is a bi-directional device which provides a conversion between transmission systems of different transmission rates, the North American T3 (44.736 Mbps) and the Japanese 6M (T2). It is used only in ATM networks. The adapter is transparent to both users and the network.

The T3 interface operates at 44.736 Mbps with the B-ISDN Physical Layer Convergence Protocol (PLCP) and meets the ATM Forum standards. The T2 interface operates at 6 Mbps according to the Japanese Nippon Telephone & Telegraph (NTT) User-Network Interface (UNI) specifications.

AT3-6ME Interface Adapter D-1