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16 CHAPTER 1: INTRODUCTION
High-Performance Features of the 3C359B NIC
The 3C359B NIC delivers the token ring industry’s highest
performance for the lowest cost, and is designed to provide
years of trouble-free operation. This section describes the
NIC’s high-performance features.
Parallel Tasking II Performance
The 3C359B NIC’s design incorporates new
Parallel Tasking
®
II performance, which takes advantage of
the latest developments in PCI bus design to deliver the
fastest data throughput and lowest CPU utilization of any
token ring NIC.
Parallel Tasking II performance is built upon a solid
foundation of proven Parallel Tasking architecture, which
introduced data pipelining and overlapping task processing
to improve throughput and achieve the industry’s fastest
data transmission and reception speeds.
DynamicAccess Class of Service
The 3Com DynamicAccess
®
software adds intelligence to
the 3C359B NIC for optimized performance and control.
With DynamicAccess Class of Service (Traffic Prioritization),
you can select time-critical applications that require the
highest-priority access to your network—such as
multimedia sessions. Based on your selection, the network
device driver recognizes high-priority applications,
prioritizes their data transmissions, and accelerates their
data transmissions in the following ways:
■ The NIC implements dual queues, allowing high-priority
traffic to be queued for transmission before
normal-priority traffic.
■ High-priority traffic is allowed to request and use
high-priority tokens (as specified in the IEEE 802.5
standard). This tends to reduce the latency experienced
in acquiring a suitable token for transmission onto
the network.
Class of Service (Traffic Prioritization) is available only with
the Network Driver Interface Specification (NDIS) 5.0 and
NDIS 4.0 miniport drivers supporting the following
operating systems: Windows NT 4.0 and Windows 98.