Contents

Design Guide

Contents

 

Introduction

3

HP c-Class BladeSystem Enclosure Overview

3

Cisco Catalyst Blade Switch 3020 for HP

5

Cisco Catalyst Blade Switch 3020 Features

6

Spanning Tree

6

Traffic Monitoring

8

Link Aggregation Protocols

9

Data Center Network Architecture

10

Data Center Network Components

10

Aggregation Layer

11

Access Layer

11

High Availability

12

Design Goals

12

High Availability

12

High Availability for the BladeSystem Switching Infrastructure

13

High Availability for the Blade Servers

13

Scalability

14

Physical Port Count

14

Slot Count

15

Management

16

Out-of-Band Management

16

In-Band Management

17

Serial Console Port

17

Management Options

18

HP c-Class BladeSystem iLO Connectivity

18

Design and Implementation Details

18

Network Management Recommendations

18

Network Topologies Using the Cisco Catalyst Blade Switch 3020

19

Recommended Topology

19

Alternative Topology

22

Configuration Details

23

VLAN Configuration

24

RPVST+ Configuration

24

Inter-Switch Link Configuration

24

Server-Port Configuration

26

Server Default Gateway Configuration

27

RSPAN Configuration

28

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

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NAD 3020 manual Contents

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.