3com MSR 20 Manual Do Utilizador

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Straight-through cable: the wire sequences of the twisted pair cable crimped in 
the RJ-45 connectors at both ends are completely the same. It is used to 
connect terminal devices (such as PCs, routers) to Hubs or LAN Switches.

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Crossover cable: The wire sequences of twisted pair cable crimped in the RJ-45 
connectors at both ends are different. It can be used to connect two terminal 
devices (such as PCs and Routers). You can such kind of cables by yourself if 
necessary.

For the pinouts, identification and making methods of these two kinds of network 
cables, see Low-End and Mid-Range Series Routers Cable Manual.

If the SIC has been properly installed, follow these steps to connect the interface 
cable:

Step 1: Connect the Ethernet port of SIC to a PC or router using a crossover cable 
and to a Hub or LAN Switch using a straight-through cable;

Step 2: Check the status of LINK LED on the SIC-1FEA panel: ON means the link is 
connected and OFF means the link is not connected. In the latter case, check the 
line.

SIC-1SAE, 1-port enhanced high-speed synchronous/asynchronous serial interface 
card, provides functions similar to SA, but its serial interfaces support more 
protocols, such as RS449, X.21, and RS530.

The interface attributes of the SIC-1SAE are given in the following table:

Table 3   Interface attributes of the SIC-1SAE

Connector DB-28 

Number of connectors 

1 

Interface standard and 
operating mode 

V.24 V.35, 

RS449, 

X.21, RS530 

RS232 

DTE, DCE 

DTE, DCE

Minimum baud rate

(bps) 

1200 1200 

300 

Maximum baud rate

(bps) 

64 k 

2.048 M 

115.2