3com MSR 20 Manual Do Utilizador

Figure 24   Extending an E1 120-ohm balanced twisted pair cable

Step 4: Check the status of LINK LED on the SIC-1EPRI/SIC-1E1-F panel: ON means 
the link is connected and OFF means the link is not connected. In the latter case, 
check the line.

1-port channelized T1/CT1/PRI compatible interface card (SIC-1TPRI) supports:

■

Transmission/Receiving and handling of T1 data streams;

■

CT1 (channel T1) access;

■

ISDN PRI function;

■

Remote loopback and local loopback, facilitating the effective and flexible 
debugging.

It is possible to use the card for multiple purposes through different 
configurations.

Following are the differences between SIC-1TPRI and 1-port Fractional T1 interface 
card (SIC-1T1-F):

■

FT1 mode of SIC-1T1-F can support only one channel bundle (the rate is n 

× 56 

kbps, n=1-24), while the 24 channels can be grouped into multiple arbitrary 
bundles by SIC-1TPRI.

■

SIC-1T1-F does not support PRI mode.

The interface attributes of SIC-1TPRI/SIC-1T1-F are given in the following table:

Router

Network 
devices such
as DDN 

DB-15

Network interface connector

RJ-45

RJ-45

120-ohm balanced twisted pair

 

120-ohm E1 trunk cable

Table 8   Interface attributes of SIC-1TPRI/SIC-1T1-F

Connector type 

RJ-45 

Number of connectors 

1