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A variety of choices of modems or other externally attached devices can be used to provide physical connectivity between link peers. Control of these devices is typically achieved by using the interface port to exchange character-based command/response sequences between the external device and the local node. These command/response exchanges allow configuration of the device, as well as control of operations such as dialing, answering, and terminating PSTN circuits.
The Customer Premises Equipment Configuration utility (CPECFG) provides a terminal interface to a serial port on the router or server to the DSU/CSU or modem. for each ROUTE.NLM parameter using, refer to "Setting Up" in the routing documentation for Source Route Bridge. For more information about CPECFG, refer to "Setting Up" in the routing documentation for NetWare Link/PPP.
Command set support differs based on device type; therefore, identification of the attached external device is necessary to the local device management logic that is responsible for physical connection control. For best results, you might want to use the same brand of modem on the local and remote ends.
The WAN device management provided is script-driven and supports multiple modem types. Modem description (MDC) files define modems used by the router. The MDC files reside in the SYS:SYSTEM directory on the router or server.
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