Cisco 1601 - Router - EN Hardware Installation Manual page 82

ISDN BRI U WAN Interface Cards
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
Figure 52
Connecting an ISDN BRI U WIC to a Network
Hazardous network voltages are present in WAN ports regardless of whether power to the unit is OFF
Warning
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
Warning 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
OL-12844-01
8
Jumper Locations on the Older ISDN BRI WIC
J1
J2
Termination jumpers
Figure 52.
A
J1
J2
No termination
B
J1
J2
100 Ohms termination
ISDN BRI WAN Interface Cards