APPENDIX
AT3-6ME Interface Adapter D-1
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-1 for a typical application.
Figure D-1 Network Application
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.
BPX/IGX
ATM interface
UNI or NNI
Network
AT3-6M
adapter
BPX/IGX
ATM interface
UNI or NNI
AT3-6M
adapter
T2 network trunk
T2 interface
ATM UNI standard
T3 ATM interface
T2 network trunk
H8186
