Quidway AR 28 Series Routers Installation Manual.pdf - Index of

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Installation ManualQuidway AR 28 Series RoutersChapter 4 Installation of the RouterAttributeSynchronousDescriptionAsynchronousMaximum baud rate(bps)64 k 4.096 M 2.048 M 115.2 kServices supportedDDN leased line backupTerminal accessModem dial-upBackupterminal access1) Synchronous/Asynchronous modeSynchronous/Asynchronous serial interface can work in either synchronous orasynchronous mode. Different signaling standards are supported in these two modes.V.35 and V.24 (RS232) support synchronous operating mode, while V.24 (RS232),support the asynchronous operating mode. The maximum transmission distance andbaud rate of the signal vary with the operating mode.Table 4-9 Transmission rate and transmission distance of V.24 (RS232)/V.35 cableV.24 (RS232) V.35Baud Rate (bps)MaximumTransmissionDistance (m)Baud Rate (bps)Maximum TransmissionDistance (m)2400 60 2400 12504800 60 4800 6259600 30 9600 31219200 30 19200 15638400 20 38400 7864000 20 56000 60115200 10 64000 50- - 2048000 30Caution:The baud rate should not exceed 64kbps when the V.24 cable operates in synchronous mode.2) DTE and DCE4-14
Installation ManualQuidway AR 28 Series RoutersChapter 4 Installation of the RouterSynchronous serial interface can operate in both DTE and DCE mode. For two devicesconnected directly, one should operate in DTE mode, and the other should operate inDCE mode. The device at the DCE side provides a synchronous clock and specifiesthe transmission rate, while the device at the DTE side accepts the synchronous clockand communicates at the specified baud rate. Usually, the router serves as a DTEdevice. To determine whether the device connected to the router is a DTE or DCE,please refer to the manual that came with the device. Also the following table will behelpful in identifying DTE and DCE. Usually, the PC or Router serves as a DTE deviceand the Modem, Multiplexer or CSU/DSU serves as a DCE device.In general, the asynchronous serial interface is connected to an external Modem or aTerminal Adapter (TA) to work as the dial-up interface. In this case, it is unnecessary todetermine whether the device is DTE or DCE, and just choose an appropriate baudrate.For the operating mode configuration of the synchronous/asynchronous serial interface,please refer to VRP3 Operation Manual.II. Synchronous/Asynchronous serial interface cableThe WAN interface of the router is a DB50 receptacle. Proper connection cable needsto be selected for the protocol applied. By far, 4 types of synchronous/asynchronousserial interface cables are available. One end of all the 4 types of cables is DB50connector, the other end (network end) varies with the cable type, which can be:• V.24 (RS232) DTE cable: DB25 (male) connector• V.24 (RS232) DCE cable: DB25 (female) connector• V.35 DTE cable: 34PIN (male) connector• V.35 DCE cable: 34PIN (female) connectorCaution:The above 4 types of cables are optional. The user must purchase the needed cables along with the router.Otherwise, they will not be provided.The following figures show the cable assembly of all 4 types:• V.24 (RS232) DTE cable assembly4-15
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