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System Administration Guide: Network Services
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Configuring Modem Speed for a Dial-up Link

A major issue in modem configuration is designating the speed at which the modem should operate. The following guidelines apply to modems that are used with Sun Microsystems computers:

  • Older SPARC systems – Check the hardware documentation that accompanies the system. Many SPARCstationTM machines require modem speed not to exceed 38400 bps.

  • UltraSPARC® machines – Set the modem speed to 115200 bps, which is useful with modern modems and fast enough for a dial-up link. If you plan to use a dual-channel ISDN TA with compression, you need to increase the modem speed. The limit on an UltraSPARC is 460800 bps for an asynchronous link.

For a dial-out machine, set the modem speed in the PPP configuration files, such as /etc/ppp/peers/peer-name, or by specifying the speed as an option for pppd.

For a dial-in server, you need to set the speed by using the ttymon facility or the Solaris Management Console, as described in Configuring Devices on the Dial-in Server.

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