Cisco Cisco VN 2900 Network Adaptation Interface Installation Guide

The WIC36-1B-S/T, WIC36-1B-U, CPAWIC36-1B-S/T, and CPAWIC36-1B-U interface cards have two 
termination jumpers, labeled J1 and J2. Before installing a WIC36-1B-S/T, WIC36-1B-U, 
CPAWIC36-1B-S/T, or CPAWIC36-1B-U interface card, ensure that the termination jumpers are set 
appropriately for your installation. 

The jumpers are factory-configured in the B position. Keep the jumpers in this position to use the ISDN 
BRI WIC 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 ISDN BRI WIC in a passive-bus connection in which 
it is not the last device on the line. The jumpers are shown in 

Hazardous network voltages are present in WAN ports regardless of whether power to the unit is OFF 
or ON. To avoid electric shock, use caution when working near WAN ports. When detaching cables, 
detach the end away from the unit first. Statement 1026

The ISDN connection is regarded as a source of voltage that should be inaccessible to user contact. 
Do not attempt to tamper with or open any public telephone operator (PTO)-provided equipment or 
connection hardware. Any hardwired connection (other than by a nonremovable, 
connect-one-time-only plug) must be made only by PTO staff or suitably trained engineers. 
Statement 23

To connect an ISDN BRI S/T WIC to a network, follow these steps:

H8586

No termination

J1

A

J2

100 Ohms termination

Termination jumpers

J1

J2

J1

J2

B