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Servicing Information
74
Installing the ISDN Link Modules
If there is an ISDN module plus another type of WAN interface module or if there
is a single ISDN module, the ISDN U or S/T Module must only be installed in the
Slot 1 position. The slot 2 position may contain another type of WAN module or
may be unused and covered with a blank panel. For this model, if there is a second
LAN module in this unit, it must go in the Slot 1 position and the ISDN module in
Slot 2.
Note: the older double width type ISDN module will not fit in this device.
CONSOLE
Slot1 Slot 2
LAN/Console module
Remove these screws
to remove the modules.
LINE
ISDN-U
10/100 BT LAN
MDI-X MDI
Figure C-2 Rear View with the ISDN U Module Installed
Processor settings for the ISDN Link Modules
ISDN S/T or U modules have jumper straps to set the module for the CPU used on the main
board. On an S/T interface, these are labeled W1 and W2; on a U interface, the pins are labeled
J1. When installing an ISDN module, check the jumpers to be certain that they are configured to
operate with the 360 series CPU by having both straps across pins W1 and W2 (S/T module) or
across pins 1-3 and 2-4 at J1 (U module), as illustrated in the figure below.
Figure C-4 ISDN Module processor setting jumpers
JUMPERS