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XE1414C Datasheet(PDF) 7 Page - List of Unclassifed Manufacturers |
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XE1414C Datasheet(HTML) 7 Page - List of Unclassifed Manufacturers |
7 / 18 page XECOM (7) XE1414C Application Note: XE1414C Leased Line Operation The XE1414C can support leased line applications. Because newer chipsets do not support automatic leased line operation, the leased line handshake must be controlled by the local host. Before attempting to establish the leased line connection, one modem must be defined as the originating modem and one as the answering modem. The local host issues an ATD to initiate handshaking on the originating modem and ATA to intiate the handshake on the answering modem. If the leased line connection is broken both local hosts must act to re- initiate the handshake sequence. No special configuration is required for leased line operation. Any modem configuration for error correction, data compression, and flow control will work. Decribed below are some configuration options which may be beneficial in your leased line application. AT&C1 This command sets the operation of the Data Carrier Detect signal. With the &C1 setting Data Carrier Detect becomes active whenever the modem detects a valid carrier signal and becomes inactive when that carrier signal is lost. The local host can monitor Data Carrier Detect to determine whether or not the leased line connection is intact. AT+MS This command controls the modem handshaking options. It can be used to limit the modem handshake to a particular speed or protocol. The +MS command includes four selectable parameters; modulation, automatic fallback during negotiations, minimum accepted data rate and maximum data rate. Setting the maximum and minimum data rates to the same value will require the modem to connect at only the desired data rate. The format and codes for the +MS command are shown below. AT+MS modulation, auto negotiation, minimum data rate, maximum data rate<ENTER> Modualtion Type V21 - V.21(300 BPS) V22 - V.22 (1200 BPS) V22B - V.22bis (2400 BPS) V23 - V.23 (1200 BPS Half Duplex) V32 - V.32 (9600 BPS) V32B - V.32bis (14,400 BPS) B103 - Bell 103 (300 BPS) B212 - Bell 212 (1200 BPS) Auto Negotiation 0 - Automode disabled 1 - Automode enabled Minimum Data Rate 300 - 300 BPS or 1200 - 1200 BPS Maximum Data Rate 2400 - 2400 BPS 4800 - 4800 BPS 7200 - 7200 BPS 9600 - 9600 BPS 12000 - 12,000 BPS 14400 - 14,400 BPS |
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