Current exchange backbones etc

mike1210

mike1210

mike1210

Associate
Joined
20 Jan 2006
Posts
313
Hello all, I was wondering last night with the roll out of FTTC, what bandwidth a typical exchange has these days.

Am I right in saying they used to be OC3 or OC12 connections depending on the size of the exchange?

Does anyone also know the actual max bandwidth from the Cab back to the exchange. Is each cab limited to 200 users on the FTTC service?

Mike :)
 
You can't really tell what Exchanges' Backhaul bandwidths are, usually because they are improved on a regular basis depending on the User takeup.

Personally, I would say a 21CN exchange with a few MSANs when first deployed will have a few Gigabits worth of backhaul (As 21CN MSANs usually have Gigabit connectivity).

A 20CN exchange (Depending on the number of DSLAMs) will typically have a few 155Mbps ATM backhaul connections (OC3) from the DSLAMs but this entirely depends on the size and location of the exchange. Before 21CN was installed in large exchanges, I believe their backhauls were usually OC12 based, with OC3 connections from the DSLAMs being multiplexed over those OC12 backhauls.


What I can tell you on the other hand is that Cabinets have Multiples (Or one of) 1Gbps Fibre based connections to the exchange (or closest Handover node) depending on the number of users on that cabinet.

Cabinets come in the form of the smaller 128 Line cabinets to the Big 288 Line cabinets (See: http://www.robertos.me.uk/html/street_cabinets_etc.html ).

I hope this answers your questions
 
Last edited:
So if each 21CN cabinet has a 1Gbps link for a small cabinet, then if all 128 users downloaded at once they'd get about 7Mbps each? (Or 14Mbps with 2 links)

I know that's not likely - but it's interesting to see how limited the FTTC rollout is.
 
You must log in or register to reply here.
Back
Top Bottom