Page "BT 21CN" Paragraph 27

The original 21CN roll out did not look to drive MSANs deeper into the network ; instead it locates them in each exchange.

Without detailed information on the critical local routings, it is very difficult to ascertain what capacity remains in the duct network and which connections run through it.

This makes planning of future upgrades or fibre additions difficult.

Openreach is looking at the possibility of integrating MSANs into the access network, although this was originally deemed unlikely to happen because there are only 5600 exchange buildings and over 85 000 Primary Connection Points, which usually come in the form of street cabinets.