3Com MSR 50, MSR 30, MSR 20 manual Interface attributes of the SIC-1SAE, Dte, Dce

SIC-1SAE 23

■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.

■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.

Connecting the Interface If the SIC has been properly installed, follow these steps to connect the interface Cable 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

Introduction 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.

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

Table 3 Interface attributes of the SIC-1SAE

	Description
Attribute	Synchronous		Asynchronous
Connector	DB-28
Number of connectors	1
Interface standard and	V.24	V.35, RS449,	RS232
operating mode		X.21, RS530
	DTE, DCE	DTE, DCE
Minimum baud rate	1200	1200	300
(bps)
Maximum baud rate	64 k	2.048 M	115.2
(bps)