I'm already using ADSL and was in the middle of using Limewire, a music download facility and noticed that some of the users have T1 and T3.

I was just wandering what the difference is between the 3?

Many thanks guys and gals!

 

T1 and T3 are actually American terms. The European version are E1 and E3.

T1 runs at 1.544Mbps (24 x 64k channels) and T3 at 44.736. E1 is 32 x 64k channels so 2Mbps.

Tx and Ex are dedicated leased line circuits (going from Point A to Point B), where as ADSL is quite different (IanW is your man to explain that).

 

Thanks very much Chris!

I'll talk to Ian next time he's on.

Cheers

 

Price is a big difference actually.

In this country, an E1 connection to the Internet will cost you upwards of £20,000 a year depending on location (maybe up to £30,000 if you are out in the sticks).

ADSL comes into your home on copper wiring, where as leased lines can be either copper or fibre optic. Generally, the bigger circuits will be on fibre.

 

So a E1 connection would be ideal for a big business?

 

Or a rich BarSteward! lol

 

Depends what u mean by "big business". Most ISPs offer E1's that you can throttle (by use of software configs) to lower bandwidths i.e. 64k, 128k, 256k, 512k and so on. This means you can increase your bandwidth as your business/net usage expands or for specific requirements like advertising campaigns etc without the need to get another telco circuit upgrade. U ring ISP up and pay for more bandwidth and it takes 5 mins to sort it out.

Bigger companies in the uk will use higher bandwidth leased lines like 8mbit, 34mbit (E3), 45mbit (T3) or even 155mbit (STM1). These can also be limited to lower bandwidths.

 

How much would I pay for that?

 

You negotiate

It depends also on your traffic profile - e.g. are you hosting (most traffic outbound) or an ISP/Access Network (most traffic inbound).

Deano

 

I see, thats excellent thanks guys!

 

Catch me on MSN and i'll go through it all with you, or send me a mail to ian.white@dataflex.com during the day and i will be happy to explain what you need.

 

Last I checked E1 was a few grand (~£5K) install and around £1500 a month, this was a while ago though!

 

E1 install costs depend on...

The telco / carrier
What's already at the A & B ends
The distance from A to B
The porting charges from the ISP (assuming it's for 'Net connectivity)

 

If you are talking about a E1 which is used for voice the install costs from BT are approximatly £1500 and about £900 per quater rental costs.

This is for a fully populated E1 trunk of 30 channels.

 

And before u ask - yes the circuit will probably have to be a BT one. This is not too bad once the line is working but the lead time on new installs is usually a couple of months so be prepared to wait.

Also - I would advise to get a backup line of at least ISDN so if there is a problem with ur leased line then at least you have connectivity. You only usually pay the install as if you have to use the line the ISP pays for the calls seeing as your main service is down (ISP specific but I would have thought most do this).

Even better is a resilient service with two lines - each to a different a and b end router, via a different telco carrier and to a different A end POP. The number of companies who rely on their internet connecitivity and dont have a backup in this day and age is shocking.