Reference Guide for the Model RT328 and Model RH348 ISDN Routers

•Twisted pair and AUI Ethernet ports (Model RT328 router only)

–RJ-45 interface allowing connection to a 10BASE-T network

–AUI interface allowing connection to a coaxial or fiber network using a transceiver

•Four-port twisted pair Ethernet hub (Model RH348 router only)

–Four RJ-45 interfaces for connection to 10BASE-T workstations

•Analog voice ports

–Provides two RJ-11 interfaces

–Allows a standard analog PSTN device (for example, telephone, fax, or modem) to make and receive calls from other ISDN or PSTN connected devices

–Eliminates the need for a separate PSTN line in a SOHO (small office/home office) environment

•Eleven LEDs for easy monitoring of status and activity

•Flash EPROM for firmware upgrade

•Five-year warranty

•Free technical support seven days a week, twenty-four hours a day

ISDN Support

The Model RT328/RH348 router is designed to take advantage of Integrated Services Digital Network (ISDN) for transmission of data over digital telephone networks. A basic rate interface (BRI), which is the usual ISDN implementation, consists of two 64 kilobit per second (Kbps) B channels for data and one 16 Kbps D channel for control information.

One advantage of using ISDN to connect routers is that the connection is set up only if there is data

to be sent to the remote network. The router sets up a call, transfers the data, and then hangs up automatically when the connection is no longer needed.

Multilink PPP Support

When the single-channel ISDN line utilization exceeds a configurable threshold, the router can automatically establish an additional ISDN call to provide additional bandwidth. During heavy traffic, the two 64 Kbps B channels are combined using Multilink PPP to provide a fast 128 Kbps pipe. When traffic slows down, one of the B channels is idled to save toll charges. The router also reverts back to one B channel for data when an analog port is used.

Introduction

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