RAD Data comm HCD-E1 Appendix C IR-ETH Interface Module

General Description C-1
Appendix C
IR-ETH Interface Module
C.1 General Description
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.
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, and then converted back to an Ethernet
signal at the remote modem.
Figure C-1 shows a typical application using an Ethernet interface bridge.
Each modem is connected to an Ethernet network via the Ethernet Interface
bridge.
HCD-E1 HCD-E1
Figure C-1 Typical Application of HCD-E1 with IR-ETH Module