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50 APPENDIX A: CABLE SPECIFICATIONS

Serial Interface Cable Synchronous and Asynchronous Mode

V.35 and V.24 (EIA/TIA-232) standards support synchronous operating mode. V.24

(EIA/TIA-232) also supports the asynchronous operating mode. The maximum

transmission distance and baud rate of the signal vary with the operating mode.

Tab le 20 Transmission Rate and Transmission Distance of V.24 (EIA/TIA-232)/V.35 Cable

V.24 (EIA/TIA-232) V.35

Baud rate (bps)

Maximum

transmission

distance (m)

Baud rate (bps)

Maximum

transmission

distance (m)

2400 60 2400 1250

4800 60 4800 625

9600 30 9600 312

19200 30 19200 156

38400 20 38400 78

64000 20 54000 60

115200 10 64000 50

- - 2048000 30

The baud rate should not exceed 64 Kbps when the V.24 cable operates in

synchronous mode.

DTE and DCE Mode

The synchronous serial interface can operate in both DTE and DCE modes. For two

devices connected directly, one device should operate in DTE mode, and the other

device should operate in DCE mode. The DCE device provides a synchronous clock

and specifies the transmission rate, the DTE device accepts the synchronous clock

and communicates at the specified transmission rate. Usually, the router serves as

the DTE device. To determine whether the device is a DTE or a DCE, refer to the

user manual for the device.

Tab le 21 Typical DTE and DCE

Type of Equipment Type of Interface Typical Equipment

DTE male PC or router

DCE female Modem, multiplexer or

CSU/DSU

The asynchronous serial interface generally is connected to a modem or a terminal

adapter (TA) to act as the dial-up interface. You do not need to determine if the

device is DTE or DCE, you must only select the appropriate baud rate.

The synchronous/asynchronous serial port cable is connected to a DB-50

receptacle. Proper connection cable needs to be selected for the protocol applied.

Four types of synchronous/asynchronous serial port cables are available. However,

these cables are optional and you must select the proper one based on your

requirements when you purchase the router All these types of cables have a DB-50

adapter at one end.

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