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Cisco Integrated Services Router Hardware Installation Guide
Chapter 3 Connecting the Router
Cisco 860, 880, 890 Series
This option allows a stepped offhook resistance during seizure, which avoids overloading the circuit
during offhook in the event that ringing voltage is present on the circuit at the same time as the trunk
seizure. The stepped offhook resistance is initially set to 800 Ohms, then adjusts to 50 Ohms when
ringing voltage is not present.
To enable the soft-offhook command on the port, and to access the connection command with plar opx
syntax, see the Cisco Command Lookup Tool.
Connecting a Voice ISDN BRI Line
Use a straight-through RJ-45 cable to connect the voice BRI port to the ISDN network through a
telephone outlet or other device.
Caution To prevent damage to the router, be sure to connect the BRI cable to the BRI connector only and not to
any other RJ-45 connector.
To connect the voice BRI line, follow these steps:
Step 1 Connect one end of a straight-through RJ-45–to–RJ-45 cable to the Voice BRI port.
Note When the interface is configured as NT and is connecting to a TE device, use a crossover cable.
See Table A-27.
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