DSL

Service Elements
Standard ADSL

Downstream Bandwidth	2Mb/s, 1Mb/s, 512kb/s & 256kb/s
Upstream Bandwidth	256kb/s
Contention*	Office Product
ADSL Max**

Downstream Bandwidth	8 Mb/s - contended 8Mb/s, 7Mb/s, 6Mb/s, 5Mb/s, 4Mb/s, 3Mb/s, 2Mb/s, 1Mb/s, 512kb/s - non-contended
Upstream Bandwidth	800kb/s
Contention*	Office Product, non-contended (1:1)
SDSL

Bandwidth	2Mb/s, 1Mb/s, 512kb/s
Contention*	Office Product, non-contended (1:1)
Bonded ADSL

Bandwidth	Combinations of either SDSL or ADSL Max Circuits up to 8Mb/s downstream
Contention*	Non-Contended (1:1)
All DSL Services

Presentation	BT dual standard RJ11/RJ45***
Local Access	BT Local Loop, PSTN Number associated with line for DSL
Topology	Client Site to NetServices NAP
Backup Options	ADSL & ISDN2e
Support	Core Hours or Extended Hours

DSL provides a cost effective and appropriate access technology to many wide area networks. ADSL is available across the UK at all broadband enabled exchanges with SDSL being available at a more restricted number of exchanges.

Standard ADSL access circuits are available with an upload speed of 256kb/s and download speeds of 256kb/s, 512kb/s, 1Mb/s or 2Mb/s to the remote sites. Services are available at 1:1 and office contention.*

ADSL Max is available as a contended and non-contended service that provides up to 8Mb/s download speeds and up to 800kb/s upload speeds. This is available at all BT serving ADSL exchanges.

The non-contended variant of this is particularly suitable when it is used to deliver 1Mb/s or 2Mb/s downstream and up to 800kb/s upstream, effectively providing a hybrid service of ADSL and SDSL.

ADSL circuits require that an operational PSTN line has been installed and is owned by the customer, and that the local BT exchange has been upgraded to provide ADSL services. NetServices can offer a combined service where both the PSTN and ADSL circuits are supplied.

SDSL access circuits are available at symmetrical speeds of 512kb/s, 1Mb/s or 2Mb/s to the remote sites, with 1:1 or office contention ratios.

DSL is available as fully managed service or as a 'wires only' service whereby Partners or their customers manage their own security layer. In this instance the point of demarcation is the BT NTE interface.

For further details on DSL please click here to view the PDF.

*Contended ADSL services were originally providing up to approximately 50:1 and 20:1 contended IP over an ADSL connection respectively. These levels are now defined as Office and Home products where Office products have priority over Home products through the shared part of the BT IPStream network. Therefore, under periods of network congestion, Office products will receive a higher downstream throughput than their Home equivalent.

**ADSL Max uses rate adaptation and advanced line management tools to find the best service that a line can support. It will allow the end-user customer to achieve the highest stable line rate that their line can RELIABLY support from 288 kb/s up to 8,128 kb/s in the downstream direction and up to 812kb/s in the upstream direction

***Within a managed service the BT dual standard RJ11/45 is available. A Wires Only solution requires a standard BT phone socket.