3com MSR 20 User Manual

C

HAPTER

 2: S

MART

 I

NTERFACE

 C

ARDS

Step 1: Choose a synchronous/asynchronous serial interface cable depending on 
the type of the interface on the remote device.

Step 2: Plug the DB-28 connector of the cable to the DB-28 port on the SIC-1SAE.

Step 3: Connect the other end of the SAE cable to:

■

Port of CSU/DSU if the WAN is a DDN line.

■

Serial port on an analog modem if the WAN is a dial-up line.

Step 4: Check the behavior of the LINK LED on the card panel. It is OFF when the 
line is faulty and signal is out of synchronization. Check the line for the cause.

1-port channelized E1/CE1/PRI compatible interface card (SIC-1EPRI) supports:

■

Transmission/Receiving and handling of E1 data streams;

■

CE1 (channelized E1) access;

■

ISDN PRI function;

■

Remote loopback and local loopback functions, facilitating fault test and 
location.

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

Following are the differences between SIC-1EPRI and 1-port Fractional E1 interface 
card (SIC-1E1-F):

■

FE1 mode of SIC-1E1-F can support only one channel bundle (the rate is n 

× 

64kbps, n=1-31), while the 31 channels can be grouped into multiple arbitrary 
bundles by SIC-1EPRI;

■

SIC-1E1-F does not support PRI mode.

The interface attributes of SIC-1EPRI/SIC-1E1-F are given in the following table:

Table 5   Interface attributes of SIC-1EPRI/SIC-1E1-F

Connector type 

DB-15 

Number of connectors 

1 

Interface standard 

G.703, G.704 

Interface rate 

2.048 Mbps 

Cable type 

75-ohm non-balanced coaxial cable 
(DB-15 to BNC)

120-ohm balanced twisted-pair cable 
(DB-15 to RJ-45)

Coaxial connector, network interface 
connector and 75-ohm to 120-ohm 
adapter