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Cabling the Connectors 35
Cabling the WAN
Connector
This section describes the WAN connector for each bridge/router model.
Model 43x and 53x ISDN S/T
Models 43x and 53x bridge/routers have an ISDN S/T connector.
The ISDN S/T port uses an RJ-45 connector. In the U.S. and Canada,
purchase an NT1 from an ISDN equipment vendor, and use it between
the bridge/router and the ISDN outlet. In other countries, you do not
need to provide an NT1 because the function is provided by the ISDN
equipment at the customer site.
For more information on ISDN cables, see “ISDN S/T Cable” on page 170.
Model 44x and 54x ISDN U
Models 44x and 54x bridge/routers have an ISDN U connector.
ISDN S/T cable
*required for U.S.
and Canada only
(CSU/DSU)
B1
Link
Line
Act
Line
Error
Connect
Fault
WAN
B2
Network
termination
(NT1)/power
supply*
ISDN-U BRI
Wall outlet
S/T interface
U interface
ISDN U cable
Link
Connect
Fault
(CSU/DSU)
B1
Line
Act
Line
Error
WAN
B2
ISDN-U BRI
wall outlet