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Author Topic: Bandwidth into a small exchange  (Read 538 times)

Weaver

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Bandwidth into a small exchange
« on: January 07, 2020, 06:14:54 PM »

How much total bandwidth is there into and out of the NSBFD exchange, and or into the aggregation node that the Broadford FTTC boxen all talk to?
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CarlT

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Re: Bandwidth into a small exchange
« Reply #1 on: January 10, 2020, 11:49:32 AM »

They will be going into a headend rather than an aggregation node - those are passive fibre trays.

There is absolutely no way to quantify this. Even Openreach themselves don't know how much bandwidth leaves the parent exchange, however they will be aware of how many Cablelinks there are from the OLTs in the headend exchange to CPs buying GEA services from them. They won't be aware of how much capacity the operators will have out of the exchange onto the network as some of it may well use other people's fibre.

Enough is the best answer I or anyone else can give, and when that capacity looks like not being enough the CPs will purchase more. The Openreach network up to the headend is not visibly contended.
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Switching: Mikrotik 2* CRS305-1G-4S-IN, 1 * CRS309-1G-8S+; various cheap and cheerful TP-Link/Netgear
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ISP: BT Full Fibre 900. Zen Full Fibre 900.

Weaver

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Re: Bandwidth into a small exchange
« Reply #2 on: January 10, 2020, 08:42:16 PM »

Fair enough. If the customers are unhappy then they will do something about it, indeed.

Is it possible to get log( bps ), or if not, log( log( bps ) )  ?  :)
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CarlT

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Re: Bandwidth into a small exchange
« Reply #3 on: January 10, 2020, 09:15:40 PM »

Really rural exchanges with no 21CN may well have a rate limited portion of an E3 - a 34 Mb circuit - that fraction being as low as 10 Mb for data services via BT Wholesale. PPPoA baby!

The PSTN is a different matter. Each call gets 64 kbps so for a small exchange a simple E1 - 2 Mbps providing 32 channels - will be ample.

The handover exchanges are relatively fibre rich. You can shove terabits down a single fibre, so it's whatever space, power and cooling is available in the exchange to hold the transmission kit.

The Salisbury exchange for instance is going all FTTP. One operator alone has purchased 80 Gbps of Cablelink capacity which they'll presumably then connect to a 100 GbE or a pair of 40 GbE links to get to their own network.

You can have a wild guess at the bandwidth an exchange might need by its premises count and the number of businesses that might be packing leased lines. Allow, generously, 2 Mbps per residential property.
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WiFi: Nighthawk® AX12 RAX120
Routing: pfSense VM
Switching: Mikrotik 2* CRS305-1G-4S-IN, 1 * CRS309-1G-8S+; various cheap and cheerful TP-Link/Netgear
Exchange: Wakefield
ISP: BT Full Fibre 900. Zen Full Fibre 900.