In-Band Management

Design Guide

The Cisco Catalyst Blade Switch 3020 contains an additional Fast Ethernet port, which connects to the HP c-Class BladeSystem Onboard Administrator, providing OOB management using the insight manager interface. The user may also use this path to access the CLI functions of the switch, transfer SNMP information, and upload software images and configuration files. This path is independent of the switch fabric. This Fast Ethernet port defaults to a Dynamic Host Configuration Protocol (DHCP) client from a DHCP server either as part of the Onboard Administrator or external on the network attached to the enclosure. The user can also set a static IP address for the Fast Ethernet port.

The Cisco Catalyst Blade Switch 3020 supports multiple switched virtual interfaces (SVIs) to be active at the same time; however, it does not perform any routing functions between SVIs. By default, the SVI is created as VLAN 1 and enabled during the setup phase of the installation. The VLAN is often referred to as the “management VLAN”. Cisco recommends that the user change the management VLAN to something other than VLAN 1. Therefore, it is important to create an SVI with another VLAN and allow this VLAN on the external front-panel ports. In addition, you can manage the switch using the Fa0 port using the Onboard Administrator on the back of the enclosure.

By default, the Cisco Catalyst Blade Switch 3020 provides no routing functions and can have only one default gateway defined. Even though the Fa0 interface is called “routed”, it cannot route user traffic. Therefore, if you enable multiple SVIs or enable the Fast Ethernet port, you will not be able to access all these interfaces from other subnets. The recent migration (12.2(22)SE) of the Cisco Catalyst Blade Switch 3020 from the LANBase image to IP Base provides basic Layer 3 routing (RIP and Static Routing and EIRGP Stub).

For best practices in selecting the management VLAN, please visit: http://www.cisco.com/en/US/products/hw/switches/ps700/products_white_paper09186a00801b49a 4.shtml.

In-Band Management

In-band management uses logical isolation to separate management traffic from data traffic. VLANs segregate the two traffic types that are sharing the bandwidth of the uplink ports. This practice is common in situations in which multiple applications running on the servers must be managed along with the network infrastructure devices.

In-band management traffic uses the uplink trunk ports located on the back of the Cisco Catalyst Blade Switch 3020s for management. Cisco recommends that the Data VLANs not be the same VLAN as the management VLAN.

Serial Console Port

The front panel of the Cisco Catalyst Blade Switch 3020 has an RJ-45 serial port that can be used to manage the switch through the CLI. The CLI can be accessed by connecting directly to the console port with the serial port of a workstation or remotely by using terminal servers and IP connectivity protocols such as Telnet.

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

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NAD 3020 manual In-BandManagement, Serial Console Port, Design Guide
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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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