NAD 3020 manual Introduction, HP c-ClassBladeSystem Enclosure Overview, Design Guide

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Introduction

Design Guide

Introduction

This guide provides best design practices for deploying the Cisco® Catalyst® Blade Switch 3020 for the HP c-Class BladeSystem enclosure within the Cisco Data Center Networking Architecture. It describes the internal components of the blade-server enclosure and Cisco Catalyst Blade Switch 3020 and explores different methods of deployment.

HP c-Class BladeSystem Enclosure Overview

The HP c-Class BladeSystem enclosure represents the next generation of blade-server and blade- switch integration. Figure 1 shows both a front and back side view of the cabinet. The c-Class enclosure can hold up to 16 half-height servers and up to 8 switch modules. The servers are available with either Intel or AMD processors. HP also offers full-height servers with two Intel processors. Both support dual-core processors. The first two switch bays must contain Ethernet switches because the onboard LAN adapters are routed to those bays. The additional six bays are available for additional Ethernet switches, Fibre Channel switches, InfiniBand switches, or copper or fiber pass-through modules. Each full-height server contains four Gigabit Ethernet interfaces, two running each module in module slots 1 and 2. Full-height servers also have three mezzanine slots for additional I/O connections such as Fibre Channel, InfiniBand, or even more Ethernet switches.

Figure 1. Front and Back Views of HP c-Class BladeSystem Enclosure

The HP c-Class BladeSystem backplane provides power and network connectivity to the blades. The base I/O module slots house a pair of Cisco Catalyst Blade Switch 3020s, which provide a highly available and multihomed environment wherein each server blade is attached through a Gigabit Ethernet port to each Cisco Catalyst Blade Switch 3020. Two Cisco Catalyst Blade Switch 3020s within the blade enclosure connect the blade-server modules to external network devices such as aggregation layer switches. Figures 2 and 3 show the logical connections between the servers, the two internal blade switches, and the outside network.

© 2008 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information.

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Contents Center Network Architecture Switch 3020 for the HP c-ClassIntegrating the Cisco Catalyst Blade BladeSystem into the Cisco DataContents Introduction HP c-ClassBladeSystem Enclosure OverviewDesign Guide Design Guide Page 5 of Cisco Catalyst Blade Switch 3020 for HPSpanning Tree Cisco Catalyst Blade Switch 3020 FeaturesDesign Guide Traffic Monitoring Design Guide Figure 5. RSPAN Example Link Aggregation ProtocolsData Center Network Components Data Center Network ArchitectureAggregation Layer Access LayerDesign Guide High AvailabilityDesign Goals High AvailabilityHigh Availability for the Blade Servers Physical Port Count ScalabilityDesign Guide Slot CountOut-of-BandManagement ManagementIn-BandManagement Serial Console PortDesign Guide Network Management Recommendations Design and Implementation DetailsRecommended Topology Primary root switch failure and recovery Configuring the Aggregate Switches Configuring the Cisco Catalyst Blade Switch 3020sAdditional Aggregation-SwitchConfiguration Alternative Topology Configuration Details Configuring the Aggregate SwitchesConfiguring the Cisco Catalyst Blade Switch 3020s Inter-SwitchLink Configuration Port-ChannelConfigurationVLAN Configuration RPVST+ ConfigurationTrunking Configuration Server-PortConfiguration Server Default Gateway Configuration Page 28 of RSPAN Configuration
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3020 specifications

The NAD 3020 is a classic integrated amplifier that has gained a legendary status among audiophiles since its launch in 1978. Known for its incredible sound quality and value for money, the NAD 3020 has become a reference point in the realm of affordable audio equipment.

One of the main features of the NAD 3020 is its high current design, allowing it to drive a wide range of speaker impedances. This capability ensures that the amplifier can deliver a dynamic sound, characterized by a robust bass response and clear treble. With a power output of 20 watts per channel into 8 ohms, the NAD 3020 is often underestimated due to its modest specifications. However, it can produce remarkable sound pressure levels and handle transient peaks with ease.

The amplifier utilizes a simplified circuit design, which is one of its defining characteristics. This minimalist approach reduces potential signal distortion, enabling the amplifier to maintain sonic integrity. The use of discrete components rather than integrated circuits contributes to its rich, detailed audio reproduction, making it a favorite among purists.

Another key technology featured in the NAD 3020 is its unique power supply design. NAD engineers incorporated a toroidal transformer, which is known for its compact size and low electromagnetic interference. This results in cleaner power delivery, which is essential for maintaining audio clarity and depth.

The NAD 3020 is also equipped with multiple inputs, including phono, line-level, and tape inputs, making it versatile for various audio sources. The built-in phono stage supports moving magnet cartridges, allowing vinyl enthusiasts to connect their turntables directly to the amplifier without needing a separate phono preamplifier.

In terms of build quality, the NAD 3020 features a sturdy chassis that minimizes vibrations, ensuring that audio performance remains stable. The user-friendly design includes a straightforward control layout, allowing users to adjust volume and tone settings with ease.

Throughout its decades-long legacy, the NAD 3020 has influenced countless audio products and remains a benchmark for entry-level amplification. Its combination of power, clarity, and affordability makes it a beloved choice for both new listeners and seasoned audiophiles seeking a dependable amplifier that doesn't compromise on sound quality. The NAD 3020 exemplifies how great engineering can lead to remarkable audio experiences, solidifying its place in the history of hi-fi audio.
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