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Chapter 1
Introduction
How to use this guide; related guides; software conventions; getting help; NB-30 Bridge firmware
version
Welcome to the SPECTRUM Element Manager for the NB-30 UserÕs Guide. We
have designed this guide to serve as a simple reference for using SPECTRUM
Element Manager for the NB-30 Bridge.
The NB-30 series bridge is a protocol-independent remote bridge that
transparently connects two remote Ethernet LAN segments via a DDS, full T1/E1,
or fractional T1 link. The bridge is fully compliant with the IEEE 802.1d Spanning
Tree Algorithm speciÞcation used when bridges are placed in parallel, and it uses
a source address table and Þltering database to Þlter or forward network trafÞc.
It is also equipped with two media-conÞgurable Single Port Interface Module
(SPIM) slots. One SPIM is required to connect the bridge to the network; the other
optional SPIM slot can be used to create a redundant link to a local network
segment. Performance capabilities include a source address table capable of
storing 8,191 addresses, a packet Þltering rate of up to 10,000 frames per second,
and a forwarding rate of up to 2,900 frames per second (or 3,800 frames if set up
for full duplex operation).
Using the NB-30 Bridge User’s Guide
Each chapter in this guide describes one major functionality or a collection of
several smaller functionalities of the NB-30 Bridge. This guide contains
information about software functions which are accessed directly from the device
icon; for information about management functions which are accessed via the
SPECTRUM Element Manager platform, consult the SPECTRUM Element
Manager UserÕs Guide or Tools Guide.