Huawei RT-FIC-4SAE User manual

Quidway® NetEngine 20 Routers Synchronous Serial Port Module

Copyright ©2007 Huawei Technologies Co., Ltd. All rights reserved.

http://www.huawei.com/products/datacomm/ 1

Quidway® NetEngine 20 Routers Synchronous Serial Port Module

Overview

The synchronous serial port module (4SAE) of an NE20 router implements the sending, receiving

and processing of synchronous serial port data stream. It supports data terminal equipments (DTE)

and data circuit-terminating equipments (DCE).

A synchronous serial port can work in the DTE or DCE mode. Two devices directly connected must

work respectively in the DTE and DCE modes. The DCE provides the synchronization clock and

assigns communication rate, while the DTE receives the synchronization clock and communicates

according to the assigned baud rate.

Electrical signal standards and baud rates supported by a synchronous serial port varies with the

working mode. The maximum transmission distance of signals depends on the baud rate and cable.

Refer to the table below for the mapping between cable, baud rate and the maximum transmission

distance of signals.

V.24 V.35

Baud rate

(bit/s) Maximum transmission

distance (m) Baud rate

(bit/s) 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 56000 60

115200 10 64000 50

- - 2048000 30

Quidway® NetEngine 20 Routers Synchronous Serial Port Module

Copyright ©2007 Huawei Technologies Co., Ltd. All rights reserved.

http://www.huawei.com/products/datacomm/ 2

At present, the NE20E router provides only one type of synchronous serial port module, namely

4-port enhanced high-speed synchronous serial port card.

Specifications

Specifications of the synchronous serial port module are described as below.

Module Interface type Description

RT-FIC-4SAE DB-28 A 4-port enhanced synchronous/asynchronous

interface module

Cable DB-28

V.24 DTE cable

V.24 DCE cable

V.35 DTE cable

V.35 DCE cable

V.21 DTE cable

X.21 DCE cable

RS449 DTE cable

RS449 DCE cable

RS530 DTE cable

RS530 DCE cable

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