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3Com Router 5000 and Router 6000 v2.41
Module Guide
Chapter 2 Smart Interface Cards
2-14
Table 2-9 Interface attributes of Router 1-Port Fractional E1 SIC
Attribute Description
Connector type DB15
Number of connectors 1
Interface standard G.703, G.704
Interface rate 2.048Mbps
Cable type
75-ohm non-balanced coaxial cable (DB15 to BNC)
120-ohm balanced twisted-pair cable (DB15 to RJ45)
Coaxial connector, network interface connector and 75-ohm to 120-ohm
adapter
Operating mode
E1
cE1,
ISDN PRI (supported by SIC-EPRI only )
FE1(supported by Router 1-Port Fractional E1 SIC only)
Supported service
Backup
Terminal access
ISDN (supported by SIC-EPRI only)
2.4.4 DIP Switch
E1/cE1/PRI interface is compatible with both 75-ohm impedance and 120-ohm
impedance. The interface matches different types of impedance through an 8BIT DIP
switch. By default, all the 8 positions of the DIP switch are ON, as shown in the
following figure: