Cabletron Systems CSX1000, CSX1200 manual WAN Access, Basic Rate Interface

USER’S GUIDE

WAN ACCESS

Since the CyberSWITCH is a factory-customized product, there is no need to install specific adapter boards in order to access the WAN. Connections for the internal BRI interface are made at the sys- tem’s back panel. On the B2, a basic rate line will connect to the RJ-45 connector labeled 1. On the B4, up to two basic rate lines will connect to the ports labeled 1 and 2. On the B8, up to four basic rate lines will connect to the ports labeled 1 through 4.

For informational purposes, the pin list for the BRI connector follows:

Pin and Signal Assignment for the RJ-45 Connector

Pin	Signal	Function
1	NC	No Connect
2	NC	No Connect
3	TX + to Network	Transmit to Line (T)
4	RX + from Network	Receive from Line (T)
5	RX - from Network	Receive from Line (R)
6	TX - to Network	Transmit to Line (R)
7	NC	No Connect
8	NC	No Connect

Note: The 10Base-T connector and the WAN connector are both RJ45 connectors. However, they do have different electrical interfaces. Take care to keep these separate.

Basic Rate Interface

Accessing services such as NTT's INS-64, BOC's Centrex Basic Rate ISDN, or PBX's basic rate lines is possible using the system’s BRI interface.

Each BRI port on the system provides two 64 Kbps channels for data and a 16Kbps signaling channel (2B+D). Both B channel connections can be active at the same time, to the same or different destinations.

The internal BRI interface provides up to four 4-wire S/T interfaces with separate RJ-45 connectors. It uses external NT1s (when necessary) to connect to the public ISDN. External ISDN terminal adapters are not needed.

In Japan, NTT provides a dedicated service called High Speed Digital-I that uses the same BRI interface. This can be either a 64Kb or 128Kbps leased circuit. The BRI interface supports from one to four HSD-I circuits, depending on the model.

46 CyberSWITCH