Ethernet network concentrators combine multiple channels into one transmission medium so that all the channels can run simultaneously. Concentrators are used to add speed and processing power to Private Branch Exchange (PBX) telephone systems, modems, Data Service Units (DSUs), an Integrated Services Digital Network (ISDN), a Virtual Private Network (VPN), a Digital Subscriber Line (DSL) and other technology. In a network, concentrators can be used to combine transmissions from multiple network nodes.

Determine your needs before you start shopping for Ethernet network concentrators. List your needs, determine your budget and map out your network topology to find a solution that will best optimize your network. Some things to consider when choosing an Ethernet network concentrators provider include:

1. Choose Ethernet network concentrators to create fast throughput for your VPN users.

2. Look for specialty concentrators for DSL, ISDN, and serial devices.

3. Save money with used and refurbished concentrators.

Action Steps
The best contacts and resources to help you get it done

Find a VPN Ethernet network concentrators provider

A VPN concentrator offers advanced encryption and authentication and offers increased capacity and throughput to remote users.

I recommend: VPN concentrators from Cisco are powerful, best-in-class VPN solutions that can support thousands of users. The products have been discontinued, but are still available from resellers like PC Connection. A Netgear VPN concentrator is a high-quality option that is still available from, and supported by, the manufacturer.

Choose DSL Ethernet computer concentrators

DSL concentrators combine multiple ports and subscribers into a single port.

I recommend: A DSL concentrator from the Dell store features a data transfer rate of up to 15 Mbps and combines traffic from several DSL subscribers into a single Ethernet port. TSRCdirect provides a range of DSL concentrators and components for Lucent systems.

Use Ethernet network concentrators to speed up your network

Connect network and serial devices to an Ethernet concentrator to add speed and high throughput.

I recommend: The AccelePort from Digi connects RS-232 or RS-422 serial ports to a PCI-based system. It's expandable to 64 ports and allows fast connections to printers, terminals and other devices. Data Comm for Business offers concentrators with simplex or full duplex links that can be used for satellite links. They feature a network management port and four, eight, 16, 24 or 32 channels.

Tips & Tactics

Helpful advice for making the most of this Guide

• •  Choose an Ethernet network concentrators provider with a well-known name that offers technical support and provides a website with drivers, software and documentation that are available for download.
• •  Use the right type of cabling throughout your network to prevent data collisions and lost connections. If the concentrator supports gigabyte Ethernet, upgrade network cards and other components so that they are compatible.
• •  Find out about warranty and return options before purchasing used equipment. You may be liable for shipping and restocking fees if you return an item. Resellers may offer a limited warranty or no warranty at all. Purchase an additional warranty if they provide this option.