
ASM-40CD Ver. 1.0 Application B-1
Appendix B
IR-ETH/QN (IR-ETH/Q)
Interface Module
B.1 Introduction
The IR-ETH/QN interface module includes a high performance self-learning Fast
Ethernet bridge, which is connected to the LAN via a single 10BaseT or 100BaseT
port, operating in full or half duplex and providing simple and cost-effective
interconnection between 10/100BaseT LANs. The IR-ETH/QN interface module also
supports IEEE 802.1/P frames and IEEE 802.1/Q frames, enabling VLAN
applications.
The module automatically learns MAC addresses of the LAN to which it is connected.
Its LAN table stores up to 1,024 addresses with 5-minute automatic aging.
Filtering and forwarding is performed at the maximum theoretical rate of
150,000 packets per second (wire speed). The buffer with 0.512 Mbit SRAM can
hold 85 frames with a throughput latency of one frame. The forwarding of the
multicast messages from LAN to WAN can be disabled.
ASM-40CD ordered with the IR-ETH/Q interface is supplied with the functionally
equivalent IR-ETH/QN interface.
B.2 Application
Figure B-1
shows a typical application of ASM-40CD operating opposite two
remote ASM-40 modems connected to the 100BaseT LANs.
Note
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