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Need More advice

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Need More advice

Hi
thanks to those who helped me before, it is a little clearer now. Ive looked on ebuyer and decided that its cheaper to buy seperately for networking broadband.
2 products ive seen are

Ebuyer ADSL Router With 10Mbit RJ45 Ethernet Port

U.S. Robotics Broadband Router model 8000

will these work? What i dont understand is why alot of the broadband routers require you to have a broadband modem connected to them. So what is the difference between a broadband router and just a network hub/switch. Sorry for being such a pain. Thanks
Angela Lodge
2 REPLIES
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RE: Need More advice

OK, routers, modems and switches/hubs are seperate devices.

First off, lets define each.

Hub: A device to link more than 1 node onto a physical network/subnet.

Switch: A device to link more than 1 node onto a physical network.subnet. However, with a hub, the bandwidth is shared, switches provide full speed links (dependant on traffic flow).

Routers: A device designed to transfer traffic, based on certain rules. These include NAT and port forwarding based routing. In larger environments, they are used to route traffic over seperate internet links, base don the desatination (IE, a router could send traffic via France to reach West Coast USA, but Direct to East Coast USA). Router are intelgent devices that have to do processing work.

Modem: This is the device that converts one type of signal into another. In ADSL, it may convert ADSL traffic into a USB feed, or ADSL traffic into ethernet traffic.

Modems do not route traffic, there main purose what they call media converters. Changing one type of traffic signal/language to another.

Routers in turn are not mdoems. They do not convert any signal, they simply send traffic accross a certain interface (changing certain information as needed, as in NAT), based on the destination.

Hubs/switches are designed to get more than one device linked together. They simply transport the data accross the cable, passing it along to the points that need it.

When you purchase a modem and rotuer combination unit, that has a hub/switch built in. You are infact purchasing 3 seperate devices, that are built into a single housing.

These combination units are far better. They provide a single point of failure, and a single support contact.

If the device fails, you need only replace the one unit. With seperate devices, it can become hard to manage, and means more fault finding for the basic user.

You will likely find that these combination units are actualy far cheaper than seperate units.
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RE: Need More advice

Hi Angela,

You do have to be a bit careful when shopping around for "Broadband routers" as although most ADSL routers have the modem built in, some are designed for both cable and ADSL and do not have this (therefore requiring a seperate ADSL modem).

I would imagine that the Ebuyer router would not require an external modem, but you may wish to check this with them. The USR device is likely to need one (again, check this).

The router we provide has the modem built in.

There is a decent explanation of the differences between hubs, switches and routers here, although it is quite technical:
http://www.duxcw.com/faq/ics/diffrout.htm

Regards,
Richard

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