New and old BT street cabinets in Coppice Close
Introduction
The photograph on this page of New and old BT street cabinets in Coppice Close by Peter Facey as part of the Geograph project.
The Geograph project started in 2005 with the aim of publishing, organising and preserving representative images for every square kilometre of Great Britain, Ireland and the Isle of Man.
There are currently over 7.5m images from over 14,400 individuals and you can help contribute to the project by visiting https://www.geograph.org.uk
New and old BT street cabinets in Coppice Close
Image: © Peter Facey Taken: 22 Sep 2012
The old cabinet is on the right, and merely contains junction boxes connecting underground cables from the exchange with underground cables running to nearby telephone posts, whence the lines go overhead to individual houses. The new, larger cabinet contains VDSL equipment to support BT Infinity broadband. Internet data will reach this cabinet from the exchange by underground fibre optic cables. The VDSL equipment converts the optical signal to electrical signals in the band 25KHz to 12MHz that are modulated onto the existing copper lines in the smaller cabinet, and thence to the houses. Voice phone calls (in the band 0 to 25KHz) continue to be carried by the pre-existing copper lines to the exchange. Presumably the underground cables in this urban area are carried in ducts emerging in the manholes seen in the photo. The ducts would permit the fibre optic cable to be pulled without digging up the road. But you can see where the pavement has been dug up to connect the new cabinet.
Images are licensed for reuse under creativecommons.org/licenses/by-sa/2.0
Image Location
Latitude
51.068742
Longitude
-1.342441