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Interface attributes, Dip switch – H3C Technologies H3C MSR 50 User Manual

Page 37

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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

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