Cfm-34-Rebm Fast Ethernet Bridge Indoor Unit Overview - SAF CFM-34-REBM Manual

1 CFM-34-REBM Fast Ethernet Bridge Indoor Unit
Overview
Proprietary notice
The specifications or information contained in this document are subject to change
without notice due to continuing introduction of design improvements. If there is any
conflict between this document and compliance statements, the latter will supersede
this document.
The following document is dedicated to the CFM series Modular Remote Fast Ethernet
Bridge Indoor Units, describing the built-in management system, configuration
functionality, hardware features, etc.
This document describes particularly the CFM-34-REBM modular bridge.
The CFM-34-REBM Fast Ethernet Bridge is part of SAF Tehnika's CFM series digital
microwave radio product family and serves as Indoor Unit (IDU) providing:
- Means of interconnecting Outdoor Unit (ODU or Radio) and user equipment;
The CFM-8-REBM, the CFM-16-REBM and the CFM-34-REBM is intended
for use with the CFM-LM Radio.
- Local management functionality.
Current document covers versions 3.12 and above for the management controller
software of all modular Ethernet bridge models.
The Ethernet bridge (henceforth in some places referred as primary bridge) is built
on the High performance full remote Ethernet bridge chipset. The Bridge is fully
compatible with IEEE802.3/Ethernet V.2 specifications. It has a 100Base-Tx LAN
interface (UTP) implemented on RJ-45 connector.
Wire speed screening and bridging is performed, depending on LAN port setting at
100 Mbps (HDX) or 200 Mbps (in full duplex topology). The bridge automatically
detects FDx/HDx mode and 10/100 Mbps LAN speed.
WAN link data rate is 34 Mbps, which is equal to full radio channel capacity available.
The bridge automatically learns MAC addresses on the LAN to which it is connected
and forwards only those frames destined for another LAN. The LAN table stores up to
1000 addresses and is automatically updated.
Filtering and forwarding is performed at the maximum theoretical rate of 150,000
frames per second (wire speed). The buffer can hold 170 frames with a throughput
latency of one frame. Forwarding can be disabled for multicast and broadcast
messages from LAN to WAN. Delay time is one Ethernet frame.
The Ethernet Bridge is of the so-called "store and forward" type, - the packet is
placed in buffer, examined, and forwarded to another port. The bridge supports
packets up to 1534 bytes long (including VLAN tagged packets) compared to
Ethernet standard value of 1518.
Feature summary:
− Full compatibility with IEEE 802.3 / Ethernet V.2
− VLAN tagging support
− 100Base-Tx (UTP) LAN interface
− Auto negotiation
− 150,000 frames per second filtering and forwarding rate
− 170-frame buffer
− 1000 MAC address LAN table
− Automatic learning and aging
The total WAN data rate of the CFM-34-REBM Fast Ethernet bridge is 34 Mbps. The
bridge provides two interface slots and thereby can be equipped with two interface
modules providing additional traffic interfaces with a maximum capacity of 2 Mbps
each. The slots can be switched on and off. The WAN data rate of the primary
Ethernet traffic (Fast Ethernet) will decrease by 2 Mbps per each active slot.
Modular Fast Ethernet Bridge Management System Technical Description and Configuration Guide
V. 3.12. 1.0 · © SAF Tehnika A/S 2003
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