RAD Data comm ASM-20 operation manual Appendix a Ethernet Interface, Description

Appendix A

Ethernet Interface

A.1 General

This appendix:

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Describes the IR-ETH for RAD modems

Describes the different IR-ETH connector options

Lists the Ethernet bridge specifications

Explains how to install and operate an Ethernet bridge.

A.2 Description

The IR-ETH is an interface module for RAD modems, used for converting the Ethernet (10BaseT or 10Base2) electrical levels to the modem TTL levels. It also converts the Ethernet protocol to HDLC to enable long distance transmission and avoid the Ethernet collision limitation.

The IR-ETH includes an internal, self-learning Ethernet bridge, which enables a high performance link between two Ethernet segments at a low transmission rate. The low-speed HDLC transmission is sent over the link using the modem modulation technique. It is converted back to an Ethernet signal at the remote modem.

Figure A-1shows a typical application using an Ethernet interface bridge. Each modem is connected to an Ethernet network via the Ethernet Interface bridge.

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Figure A-1 Ethernet Interface Typical Application

Description A-1