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Author Topic: Cabinet to Exchange Link  (Read 1236 times)

roswellgrey

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Cabinet to Exchange Link
« on: July 26, 2016, 08:07:18 AM »

              Copper                                   Link A                                               Link B
CP <-----------------> CABINET <--------------------------------> EXCHANGE <----------> HAND-OVER <--------------> BT RETAIL
                                                                                                                                                   <--------------> ISP A
                                                                                                                                                   <--------------> ISP B etc etc 

This musing is just based on a BT Wholesale provided service (not LLU)

In the above over-simplification of a VDSL scenario,
 - are "Link A" & "Link B" just fat pipes that are unfettered i.e. they in no-way care which ISP the traffic "belongs" to, or
 - is a specific capacity/rate level effectively purchased by the ISPs for these links ? (and hence they are effectively limited on an ISP basis) ?

Considering a single customer, these Links only inherently have to deal with as much traffic as the customer's VDSL sync speed and the ISPs backbone will allow (being the join between the two ends), but I was just curious if the ISPs choose (and pay for) a capacity level specific to these links, or if they are just fat-pipes that all ISPs have equal access to on a first-come, first-served basis ....

edit - oops - this should probably be in the broadband technology section - sry :(
« Last Edit: July 26, 2016, 08:10:23 AM by roswellgrey »
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WWWombat

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Re: Cabinet to Exchange Link
« Reply #1 on: July 26, 2016, 05:26:04 PM »

The cabinet <-> handover connection is just one link; there is no "exchange" in the picture.
 
It seems that the links are all deployed using 1 fibre as bi-directional 1Gbps ethernet. 4 fibres have been blown, so additional parallel connections can be deployed at a later date if traffic levels demand. But, however many physical connections get used, they appear to be a single fat pipe as far as the ISPs are concerned.

However, there is an amount of capacity guaranteed for carrying multicast TV vs individual unicast traffic.

And, if things get congested within the unicast traffic, then each subscriber will find they only merit a small portion of that pipe; that the handover will balance capacity. It is first-come, first-served until capacity runs out.
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roswellgrey

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Re: Cabinet to Exchange Link
« Reply #2 on: July 26, 2016, 05:50:33 PM »

Thanks for that :)
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