Chapter 2: INSTALLING THE CSMIM-T1
2-4 CSMIM-T1 Hardware Installation Guide
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.
2.3 NETWORK 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).
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.
J24
1 2 31 2 3
Loopback Mode: Jumper
over pins 2 and 3
Bypass Mode: Jumper
over pins 1 and 2
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