Cisco Cisco VN 2900 Network Adaptation Interface インストールガイド
Connecting Voice Interface Cards to the Network
Foreign Exchange Office (FXO) Interface Cards
7
OL-12847-01
Connecting FXO Cards
Use a straight-through RJ-11 cable to connect the FXO voice interface card to the PSTN or PBX through
a telephone wall outlet.
a telephone wall outlet.
Note
Ports on this interface card are colored pink.
Step 1
Confirm that the router is still turned off.
Step 2
Connect one end of the straight-through RJ-11 cable to an RJ-11 port on the card. (See
.)
Figure 8
Connecting an FXO Card
Step 3
Connect the other end to an RJ-11 telephone wall outlet.
Note
If you have specified the use of a private line automatic ringdown (PLAR) off-premises extension (OPX)
connection mode for an FXO voice port (with loop resistance less than 8000 Ohm), you must ensure
that the soft-offhook option is enabled on the port.
connection mode for an FXO voice port (with loop resistance less than 8000 Ohm), you must ensure
that the soft-offhook option is enabled on the port.
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.
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 soft-offhook command on the port, and to access the connection command with plar opx
syntax, see the
syntax, see the
.
Straight-through
RJ-11-to-RJ-11 cable
RJ-11 ports
RJ-11 wall jack
41195
SEE MANUAL BEFORE INSTALLATION
VIC
FXS
IN USE
IN USE
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