Specifications

ASMi-52CD Ver. 1.0 Introduction F-1
Appendix F
IR-ETH/QN Ethernet/Fast
Ethernet Card
F.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. The module also supports fault propagation.