[Waverley ARS] E.1 speeds [WAS: Re: Fwd: RE- ISP bandwidth]

[Doug Rosser]

Adam
The reality is that the base data circuit is still an E1 (2Mb/s)  
although higher  multiples are used when needed.
The break point between technologies  are 2/8/34/45 and 155 Mb/s - so  
6Mb/s is delivered as 3 x E1s

The voice variant is the ISDN PRI - which is channelised as you  
indicated. (Looks like it is a bit less than $900 month - which has  
come down a bit since l last time i played...)
One of the drivers is that the equipment interface for an E1 is  
relatively standard but at higher speeds they are a less common and  
more costly
Doug

On 08/04/2007, at 11:04 PM, Adam Carmichael wrote:

> Doug Rosser wrote:
>> node - Given the still exorbitant costs of E1's you will find that  
>> most ISPs that deliver over ADSL will end up doing some sort of  
>> throttling at busy times.
> Are you sure they're still using E1? That offers only a max of  
> about 2Mbps speed. (can someone confirm my maths please - it's been  
> a few years):
>
> 30B channels + 2D channels = 32 timeslots
>
> Each time slot allocated:
> 8 bits * 8000hz = 64kbit * 32 = 2048Kbps
>
> Thanks,
>
> Adam
>
> -- 
> Adam "carneeki" Carmichael - VK2FNRD
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