Cisco 1605-R How To Use Manual page 57

Setting Jumpers on ISDN BRI Cards
Setting Jumpers on ISDN BRI Cards
The older BRI S/T WAN interface cards (product numbers WIC36-1B-S/T, WIC36-1B-U,
CPAWIC36-1B-S/T, CPAWIC36-1B-U) have two termination jumpers, labeled J1 and J2.
Before installing this card, ensure that the termination jumpers are set appropriately for
your installation.
The jumpers are factory-configured in the B position (100-ohms termination). Keep the
jumpers in this position to use the BRI S/T WAN interface card in a point-to-point
connection or as the last device on the line of a passive-bus connection. Set the termination
jumpers to the A position to use the BRI S/T WAN interface card in a passive-bus
connection where it is not the last device on the line. The jumpers are shown in Figure 3-9.
The newer BRI interface cards (product numbers WIC-M1B-S/T or WIC-M1B-U) do not
have termination jumpers.
Connecting WAN and Voice Interface Cards to a Network 3-9