RAD Data comm 100 Features, Description, Two priority queues according to 802.1p or IP ToS bits

FEATURES

•High performance miniature remote bridge for Fast Ethernet extension

•Wire-speed WAN throughput: 19,700 pps at 10 Mbps

•10/100BaseT interface

•Synchronous WAN interfaces: V.24, V.35, V.36, RS-530, X.21, or 4-wire modem

•Two priority queues according to 802.1p or IP ToS bits

•Fault propagation of WAN error conditions to LAN port

•Automatic MDIX support

•Compatible with applicable parts of IEEE 802.3

DESCRIPTION

•TinyBridge-100 is a high performance, remote, self-learning Ethernet/Fast Ethernet bridge. Its small size and low cost make it ideal for sensitive bridging applications, or as a LAN extender over synchronous WAN.

LAN INTERFACE

•TinyBridge-100 is available with a 10/100BaseT interface. The interface operates in full or half duplex Ethernet topologies.

•TinyBridge-100 supports a packet length of up to 1536 bytes.

•Automatic MDIX allows using straight or crossed cables for the LAN connection.

•MAC addresses of the LAN to which the unit is connected are automatically learnt. Only those frames destined for the remote LAN are forwarded. The LAN table stores up to 2048 addresses and is updated automatically.

•MAC address filtering can be disabled, allowing all traffic to flow over the WAN link

•TinyBridge-100 has two queues for handling priority, determined in the following order:

If the packet received is an Ethernet tag frame, TinyBridge-100 marks the packet according to the tag priority (0–7).

0–3: low priority queue

4–7: high priority queue

Otherwise, TinyBridge-100 marks the packet according to IP-ToS priority (0–7). 0–3: low priority queue

4–7: high priority queue

Untagged and non-IP frames enter the low priority queue.

Frames egress from the queues with a 1:2 ratio, two frames with high priority, one frame with low priority.

•Flow control for full duplex and backpressure for half duplex are supported. The buffer holds up to 120 frames.

WAN INTERFACE

•A selection of synchronous WAN interfaces is available:

V.24/RS-232 V.35 V.36/RS-449 X.21 RS-530.

•A fault on the WAN can be propagated if fault propagation is enabled; the TinyBridge-100 shuts down the link and forces a router to trace another route.

•TinyBridge-100 operates over synchronous links at data rates of up to 10 Mbps. An external clock can be supplied for operation at other bit rates.