32Chapter 2: Installation

Figure 14 AUX cable assembly

WAN Interface to

DSU/CSU

Introduction to the synchronous/asynchronous serial interface

The fixed WAN interface of the Router 5000 is a synchronous/asynchronous serial interface, which is usually used for the connection with a WAN device, such as a Modem or CSU/DSU. It can operate in the synchronous/asynchronous mode or DTE/DCE mode, depending on the application. For the attributes of the interface, please refer to Table 15.

Table 15 Attributes of the synchronous/asynchronous serial interface

 

 

 

Description

 

 

 

 

 

Attribute

Synchronous

 

Asynchronous

 

 

 

 

Connector type

DB28 or DB50

 

 

 

 

 

 

 

Interface standard and

V.24

 

V.35/X.21

RS232

operating mode

 

 

 

 

DTE/DCE

DTE/DCE

 

 

 

 

 

 

 

 

Minimum baud rate

1200

 

1200

300

(bps)

 

 

 

 

 

 

 

 

 

Maximum baud rate

64K

 

2.048M

115200

(bps)

 

 

 

 

 

 

 

 

Matching cable

V.24 (RS232) DTE cable

 

 

V.24

(RS232) DCE cable

 

 

V.35

DTE cable

 

 

 

V.35

DCE cable

 

 

 

X.21

DTE cable

 

 

 

X.21

DCE cable

 

 

 

 

 

 

 

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3Com 5000 manual WAN Interface to, Attributes of the synchronous/asynchronous serial interface