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Symmetric digital subscriber line (SDSL) is a technology similar to ADSL (asymmetric digital subscriber line) - the difference being you have a fast upload and download speed to the internet, not just a fast download speed as you have with ADSL broadband.

You will require an SDSL modem but this will normally be provided by your SDSL supplier. 

If you want to implement a site to site solution for your business then you will need a fast upload and download speed operational on at least one end of the link, preferably both.

Remember if someone is downloading a file from your server, their fastest download speed is the same as your fastest upload speed.

For the sake of argument you uploading a file to them is the same as them downloading a file from you.

With ADSL for a 2Mbps connection your theoretical upload speed is 256Kbps, with SDSL at each end both sites experience an upload and download speed of 2Mbps.

This puts SDSL as a site to site solution at a clear advantage to ADSL.

In practice this would be implemented using a Virtual Private Network (VPN) gateway also at each of your sites so as to secure the flow of data between the 2 sites. This encrypts the traffic as it flows over the internet, but will also reduce your speed between sites due to the encrypting and decrypting of the data.

An SDSL VPN building to building solution can give a good price / performance ratio compared with a Leased Line solution but you are limited to a theoretical maximum bandwidth of 2Mbps. Remember that this bandwidth will usually be shared with other business users at a contention ratio  of 1:10.

SDSL Cost

Now lets look at actual costs using BT’s own prices as of 21^st March 2006.

Product: BT Business Broadband Advanced 2000 (2Mbps)
Connection Charge: £595 Quarterly Rental: £1035

So the link cost in the first year comes to ((1035 x 4) + 595) x 2 = £9420
And every subsequent year after that the cost will be 1035 x 4 x 2 = £8280

So over 3 Years the link will cost £25,980 for a 2Mbps link.
And over 5 years the link will cost you £42,540 for a 2Mbps link.

This does not include the cost of your VPN solution.

So how does this compare with paying a one off payment of:
   £6,655 for a 14Mbps link or
 £11,868 for a 100Mbps link or even
 £21,184 for a 1000Mbps link ?

Have you checked yet whether a high speed Laser Link, Wireless Link or Microwave Link is viable between your premises?

Click here to see Alternative Costs...

Let External Networks save your company thousands of £'s per year - every year with a Laser or Radio Link.

In addition to no annual rental, some of the benefits our customers gain from owning their own high speed link are:

Data - Connect IP networks together allowing company wide access to services, remote management of servers and workstations located at branch sites, real time off site backups.

Voice – Make free internal telephone calls between your sites. Extensions to your PBX or a full IP Telephony solution may be required.

Video - Employ IP camera technology to enable video conferencing for employees between sites, or to remotely monitor branch sites for security purposes (CCTV).
 

The most compelling argument for purchasing a Wireless Radio, FSO Laser or Microwave link is that...


you will own the link with
no high annual rental costs.

 

We Supply Leased Line,  SDSL, ISDN and Alternative options such as a Laser Link, Wireless Link or a Microwave Link . We link building's delivering secure high bandwidth solutions for LAN's / WAN's.