Specifications

IR-ETH Connector Options B-1
Appendix B
IR-ETH Interface Module
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. It is converted back to an Ethernet signal at the remote modem.
Figure B-1 shows a typical application using an Ethernet interface bridge. Each
modem is connected to an Ethernet network via the Ethernet interface bridge.
ASMi-31 ASMi-31
Figure B-1. Typical Application of ASMi-31 with IR-ETH Module
B.1 IR-ETH Connector Options
Figure B-2 shows the rear panel of ASMi-31 with the IR-ETH option. Table B-1
lists the RJ-45 connector pinout.
Appendix A describes the pinout of the DB-25 connector serving the LAN
connection of the ASMi-31/R card.
GND
245
LINE
10BASE-T
RXLINK
TXCOLL
~ 100-240VAC/ 48/60VDC
Return Power
Figure B-2. ASMi-31 Rear Panel with IR-ETH/UTP Connector