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66 CHAPTER 8: FLEXIBLE INTERFACE CARDS
4-port Channelized
E1/PRI FIC (3C13866)
and 4-port Fractional
E1 FIC (3C13823)
4-port Channelized FIC
4-port Channelized FIC function to transmit, receive, and process E1 data
flows. In addition, they provide access to CE1, implementing the ISDN PRI
function, so that one board can serve multiple purposes.
4-port Fractional FIC
4-port Fractional FIC are fractional E1 (E1-F) cards. They are different from
4-port Channelized FIC primarily in the sense that:
■ The time slots can only be bundled into one channel at the speed of nx64K,
given n=1-31. However, an E1 card allows the arbitrary grouping of 31
channels and multiple bundling operations.
■ The E1-F cards do not support PRI mode.
Interface Attributes The following table describes the interface attributes of 4-port Channelized FIC
and 4-port Fractional FIC.
Table 7 Interface attributes of 4-port Channelized FIC and 4-port Fractional FIC
Attribute
Description
4-port Channelized
FIC
4-port Fractional E1
FIC
Connector DB25
Connector
number
1
Interface
standard
G.703, G.704
Interface speed 2.048Mbps
Cable E1 75-ohm non-balanced coaxial cable
E1 120-ohm balanced twisted-pair cable
120-ohm 4E1 adapter cable (4-port Channelized/4-port Fractional E1
FIC)
75-ohm 4E1 adapter cable (4-port Channelized/4-port Fractional E1 FIC)
Coaxial connector, network connector, 75-to-120-ohm adapter (with BNC
connector)
Operating
mode
E1, CE1, ISDN PRI (only supported by 4-port Channelized FIC)
FE1 (only supported by 4-port Fractional E1 FIC)
Supported
service
Backup
Leased line access
ISDN PRI (only supported by 4-port Channelized FIC)