Cabletron Systems CSMIM-T1 manual Network Bypass Jumper

Chapter 2: INSTALLING THE CSMIM-T1

To set the Subnet jumper, refer to Figure 2-1 and configure pin row A of

J12 as follows:

•Normal Operation (maintain continuity of the backplane: Default):

Place a jumper over the center pin and pin 3 in pin row A.

•Subnet mode: Place a jumper over the center pin and pin 1 in pin row A.

2.3NETWORK BYPASS JUMPER

The CSMIM-T1 has an internal jumper that is used to select a bypass mode for the T-1 Engine. The T-1 engine will go into a bypass mode when the MMAC hub is powered down, reset, or when the CSMIM-T1 module is removed from the hub. This jumper is labelled J24, and is located on the modem board, just behind the T-1 Network Interface port (See Figure 2-2).

Front of Module

Top

J24

1 2 3

Loopback Mode: Jumper over pins 2 and 3

1 2 3

Bypass Mode: Jumper over pins 1 and 2

Figure 2-2 Network Bypass Jumper

The jumper can be set to Network Loopback Mode (default setting) or Bypass Mode. Please check your module to see that the jumper is configured in the default setting before installing into your hub.

Network Loopback Mode loops back all signals on each interface.

The Bypass Mode will connect the DSX1 lines directly to the DS1 lines.

2-4 CSMIM-T1 Hardware Installation Guide