3Com Courier Reference

Contents

3Com Courier Reference Manual pdf 125 page image

Configuring the Courier V.Everything Modem for Leased Line Operation 16-3Configuring theCourierV.EverythingModem for LeasedLine OperationYou can use the Courier V.Everything modem in either smart or dumbmode (determined by the position of DIP switch 8).If you are using your modem on a leased or dedicated line, it is set to&L1, and the remote modem has a comparable setting, the modemsautomatically connect when they are powered on. They also reconnect,without any operator intervention, if a disturbance on the line is severeenough to break the connection.1 Set your terminal or communications software to the rate at which youwant the modems to communicate.For example, use a terminal/software setting of 9600 bps and, if bothmodems have the capability, they will connect at 9600 bps.2 Send AT&B1&S2&H1&L1&W to the modem.We recommend using the &S2 setting to delay CTS until after theconnection is made, as a precaution.If the modems are in the process of connecting or reconnecting, theCourier V.Everything modem interprets any keyboard data entry,including an accidental key stroke, as a key-press abort, and hangs up.Delaying CTS until after carrier detection prevents this from happening.However, you have to set the Courier V.Everything modem for hardwareflow control by sending AT&H1.If your software or machine does not support Clear to Send (CTS), don'tinclude &S2 and &H1 in the command string as suggested above. Butkeep in mind that if the modems fail to connect or reconnect, the reasoncould be a keypress abort.&B1 Fixes the Courier V.Everything modem's serial portrate at the same rate you selected when setting upyour communications software.&S2 Causes the Courier V.Everything modem to send aClear to Send (CTS) signal only after it sends theCarrier Detect (CD) signal, that is, only after itconnects with the remote modem.&H1 Enables hardware (CTS) flow control.&L1 Forces the modems off hook at power on andenables them to re-establish the connection shouldit be broken (for leased lines only).&W Writes the settings to nonvolatile memory(NVRAM) as power-on defaults.