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FTTP

jeep

Casual Member
Hi could anyone tell me does the fibre to your home come from the fttc cabinet ? or is it a separate entity from the exchange or something, many thanks.
 

TechGuy

Casual Member
FTTP comes from the exchange to your home.

Setup is usually from the Fibre spine in the exchange known as the ODF (Optical Distrubution Frame), to a splicer, then to a smaller splicer, to a CBT (Connectorised Block Terminal) from here to a grey CSP (Customer Service Point) located on the wall of your home and then to the ONT (Optical Network Terminal)

Hope this helps.
 

Mark.J

Administrator
Staff member
ISPreview Team
As above, FTTP generally comes from an exchange or data centre headend. However, there are such things as mini-headends or mini-OLT (Optical Line Terminals) - also known as a subtended head end, which can sometimes be installed alongside or inside existing cabinets (FTTC / VDSL2 or PCP). Openreach may deploy these in certain rural areas.

I've also seen some other operators that build very large cabinets that effectively act as mini exchanges for rural FTTP deployments. You won't see these on street corners though as they're too big, so they'll often be hidden away on a private site somewhere. In other words, FTTP comes from an exchange, but how you define an exchange is another matter.
 

Pheasant

ULTIMATE Member
FTTP comes from the exchange to your home.

Setup is usually from the Fibre spine in the exchange known as the ODF (Optical Distrubution Frame), to a splicer, then to a smaller splicer, to a CBT (Connectorised Block Terminal) from here to a grey CSP (Customer Service Point) located on the wall of your home and then to the ONT (Optical Network Terminal)

Hope this helps.
Yep if it’s Openreach it will originate from the OLT (Optical Line Terminal) in the handover / headend exchange (not necessarily the local copper/ADSL exchange mind) to an Aggregation Node. This happens to be the same point at which FTTC cabinets have their connection.

The fibre then continues to a splitter node* (where the one fibre strands is optically split 32 ways to 32 individual fibres). At this point the fibre is spliced to deliver the service to connection points; CBTs, these are the end point entry/exit points of the distribution network. A mechanical screw-in connection at the CBT for the individual drop cable for an premises. From there typically taken to a CSP** where the drop fibre stops and is fusion spliced to an inside/out fibre which has a factory terminated green coloured SC/APC connector into the ONT.

* you said splicer, but think you may have meant “splitter”. The splicer is the tool used to effectively weld together the two separate ends of glass into one contiguous connection. On the OR network there is only one level of splitting and it’s done at the splitter node 1:32. Typically with 30 useable connections.

** a few years ago Openreach experimented with CSP-less installs, of which I’m one, and the drop cable is transitioned from its black outer to a white indoor compliant cable and the engineer field terminated the SC/APC connector at the ONT end.
 
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