Справочник Пользователя для RAD Data comm ASM-60
IR-ETH Connector Options
A-1
Appendix A
IR-ETH Interface Module
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.
(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.
shows a typical application using an Ethernet interface bridge. Each
modem is connected to an Ethernet network via the Ethernet interface bridge.
ASM-60/CO
ASM-60/CPE
LAN
LAN
Central Office
Customer Premises
4-wire
2.0 km (1.2 miles)
Figure A-1. Typical Application of ASM-60 with IR-ETH Module
A.1 IR-ETH Connector Options
connector options.
lists the RJ-45 connector pinout.
A-1 2
4 5-B
: FOR CONTINUED
TYPE AND RATING OF FUSE.
FIRE, REPLACE ONLY WITH SAME
PROTECTION AGAINST RISK OF
CAUTION
100
-23
0 V
A
C
0.
25
0A
T 2
50V
10BASE-T
TX
COLL
RX
LINK
LINE
Figure A-2. Rear Panel of ASM-60 with IR-ETH Module (RJ-45 Connector)