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contention and bulldog

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contention and bulldog

hi

how great can the difference be between a contention ratio of 20:1 and 50:1?

isp called bulldog has lower prices than others, why?

thx
4 REPLIES
Community Veteran
Posts: 14,469
Registered: 30-07-2007

contention and bulldog

The answer to your first question is 30...

The contention ratio determins how many connections share a particular cable or pipe on BT's network. When your ADSL is activated you are assigned to a particular pipe to which 19 (20:1) or 49 (50:1) other ADSL users could also be assigned. The pipes have a fixed bandwidth available so 20:1 means the fixed bandwidth is shared between a max of 20 ADSL connections. a 50:1 ratio means up to 50 ADSL connections can share the pipes bandwidth. How this effects you depends on what contention ration product you are on and how many others are also assigned to the same pipe. If it is nearer the 50 connections mark then at busy times you may reach the maximum bandwidth the pipe allows so you see a reduction is overall throughput for the individual ADSL connections.

The 20:1 contention products mean the same fixed bandwidth is shared between less connections so your overall throughput at peak times should be better. Because there are less ADSL connections on a 20:1 pipe, the cost per connection is higher to the ISP (which often get charged a fixed fee for using the pipe) which is why business products (which tend to be 20:1) are more expensive.

So you should get a better quality and hence better overall throughput with a 20:1 product than a 50:1 product.

For your second question, are you really comparing like for like with the packages available.

Care to give us some examples?
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contention and bulldog

Bulldog are a Datastream ISP, whereas PlusNet are IPStream based (for the most part).

IPStream is a BT product, where BT manage the connection and transit of data, right the way through until the equipment of the ISP in there offices or data centre.

DataStream is a method of providing the cable to the customer, the equipment needed in the exchange, and then the ISP must rent or supply there own data transit from the exchange.

The differance is, you pay BT for the privilage of performing all this, and with DataStream, the ISP can set the cost level, by keeping costs to a minimum.

For example of this, I would sugest reading the forums on ADSL Guide. Look at the service from ISPs like Bulldog, Fast24 and Tiscali (DataStream ISPs) versus PlusNet, Pipex, VISPA and others (IPStream).

The BT network is only reaching contention on only a few exchanges (see HERE and click on the latest update for info on the number of exchanges running high), whilst DataStream suppliers run there lines very very close to the contention point at all times to keep costs low.

If you are refering to the news article on the front on ADSL Guide, then read it all. The primetime products also only run full speed off-peak, and slower during office hours.
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contention and bulldog

thank you for the replies, really expected you two gave some explanations, asked the first question because i was on 50:1 before and now 20:1, can not really feel the differences though.
Community Veteran
Posts: 14,469
Registered: 30-07-2007

contention and bulldog

You won't see much difference because BT don't currently max out either the 50:1 or 20:1 connections so in theory there is enough bandwidth for all connections.