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Communications Processors: A Definition and Comparison

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Freescale Semiconductor, Inc.

Network Processors:

A Definition and Comparison

A growing class of communications silicon, the Network Processor, promises to

revolutionize how networking vendors architect, develop, and support their products.

Network Processors deliver dramatic improvements in time-to-market, product lifetime,

and system capabilities. This paper examines the benefits of Network Processors in

comparison to other networking silicon offerings.

A Brief History of Network Product Design

The design of networking products has undergone continuous evolution as the speed and

functionality of local and wide-area networks have grown. In the early days of

packet-based networking, networking devices (such as bridges and routers) were built

with a combination of general purpose CPUs, discrete logic, and ASSPs (Application

Specific Standard Products), including interface controllers and transceivers. The

software-based nature of these devices was key to adapting to new protocol standards

and the additional functionality required by networks, such as the early Internet. Although

these designs were large, complex, and comparatively slow, they met the needs of these

early networks (generally comprised of a few Ethernet or Token Ring connections and

slow (56kbps) wide-area links).

Over time, as network interface speeds and densities increased, the performance of

general-purpose processors fell short of what was needed. This led network vendors to

develop simpler, fixed-function devices (such as Layer 2 Ethernet switches) that could be

built with ASICs (Application Specific Integrated Circuits). These devices traded-off the

programmability of software-based designs for hardware-based speed. As ASIC

technology progressed (and vendors invested heavily in hardware-oriented design

teams), more and more functionality was incorporated into the hardware. This was

enabled in part by protocol consolidation around IP and Ethernet as the dominant

enterprise network technology, which reduced the need for product flexibility.

By: David Husak

C-Port Founder and

Chief Technical Officer

The relative simplification of network products has allowed merchant silicon vendors to

“commoditize” some networking segments through specific chipsets, such as Layer 2

Ethernet “switch-on-a-chip” products. Some of these solutions offer significant

functionality within a narrow range of applications, such as ATM switching or basic

Ethernet/IP switching. However, network vendors seeking clear product differentiation

still required long and risky internal ASIC development programs.

Today’s Network System Development Challenge

“It’s the software, stupid!”

Vint Cerf, Senior VP for Internet Architecture and Technology MCI WorldCom, and “Father of the Internet”

ComSec Seminar, January 1999

Today, the convergence of public voice and data networks is speeding up the pace of

change in the communications industry. This is leading to increased time-to-market

pressure and shorter product lifecycles — just when product development cycles are

growing due to complex ASIC designs and associated software re-designs.

Although IP is emerging as the dominant protocol, newly defined IP capabilities, such as

Quality of Service (QoS) and Multiprotocol Label Switching (MPLS), require vendors to

continually support new applications. In addition, the number of different interface types,

White

Paper

For More Information On This Product,

Go to: www.freescale.com

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