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■X.21 DTE cable: DB15 (male) connector at the network end
■X.21 DCE cable: DB15 (female) connector at the network end
One end of the cables is connected to the router side via the 
Connecting the Interface
Cable
Before connecting the FIC, confirm the model of the equipment that is connected with the signaling criterion required by the access equipment, baud rate, and synchronous clock.
1Check interface type of the peer device and choose the sync/async serial interface cable of correct type.
2Plug the 
3Connect the other end of the FIC cable to the following equipment:
If the WAN is a DDN, please connect the cable to the interface of the CSU/DSU.
If the WAN is a dialup line, please connect the cable to the serial interface of the analog Modem.
4Power on the router, and check the status of the LINK LED of the FIC. It is off when the line is faulty and signal is out of step.
E1/PRI FIC (3C13866)
and 
E1 FIC (3C13823)
Interface Attributes
4-port  Channelized FIC
4-port  Fractional FIC
■The time slots can only be bundled into one channel at the speed of nx64K, given 
■The 
The following table describes the interface attributes of 
Table 8 Interface attributes of 
| Attribute | Description | 
| 
 | 
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