H3C Technologies H3C MSR 50 - Manual (Page 37)

2-17
It is possible to use the module for multiple purposes through different configurations.
Interface attributes
The interface attributes of SIC-EPRI are given in the following table:
Table 2-15 Interface attributes of SIC-EPRI
Attribute Description
Connector type DB-15
Number of connectors 1
Interface standard G.703, G.704
Interface rate 2.048 Mbps
Cable type
z 75-ohm unbalanced coaxial cable (DB-15 to BNC)
z
120-ohm balanced twisted-pair cable (DB-15 to RJ-45)
z
Coaxial connector, network interface connector and 75-ohm to
120-ohm adapter
Operating mode
E1
CE1, ISDN PRI
Supported service
Backup
Terminal access
ISDN
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:
Figure 2-16 Default setting of the DIP switches
on
1
2
3
4
5
6
7
8
8BIT description and settings of DIP switch are given in the following table:
Table 2-16 Description and settings of the internal DIP switch of SIC-ERRI
DIP switch Description 75-ohm impedance 120-ohm impedance
1BIT ON OFF
2BIT
Switch for
75-ohm/120-ohm options
ON OFF