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UK—Channel Islands No 7 submarine cable system

In 1986 there was a visit to the Stoke Fleming telephone exchange for the Doomsday Reloaded project.  This is probably the old telephone exchange in Mill Road, which is now a cold store for a fish merchant.

    Just outside Stoke Fleming is a    
 large building looking like a stone   
 walled bungalow.Actually it is the    
 telephone exchange. It has been built 
 to blend in with its beautiful area.  
    It is very big because it is not   
 just the village's phone lines which  
 go there. From Blackpool Sands a cable
 goes under the sea to the Channel     
 Islands.  It can carry 500 telephone  
 calls at once.                        
   In our visit to the Exchange we saw 
 where it joins the national phone     
 system. In the exchange they have     
 their own enormous generators to keep 
 the phones working if there is a cut  
 in the electricity supply.            
    The exchange is automatic and we   
 watched the numbers being dialled.

Terrestrial Segment Repeater Stations


From the TyCom cable landing stations at Pottington and Highbridge, the land segment of the cable travels through Wiltshire, Berkshire and Buckinghamshire to Stratford in London.

From here it travels through Herefordshire, Bedfordshire and Northamptonshire, and then through Leicestershire, Nottinghamshire and then in to Yorkshire, terminating at Hunnamby.

Along the way, the signal requires regeneration every 73km approximately (with a tolerance of approximately +/-3500m) and so building to house the repeater equipment is necessary.
The photos here are of one example site.

New Scottish Inter-Island Submarine Cables

BT announces 20 new fibre optic submarine cables.

Largs – Millport
Kilchattan Bay – Millport
Rothesay – Toward
Kilfinan – Lochgilphead
Campbeltown – Shiskine
Corrie – W. Kilbride
Jura – Port Askaig
Glenbarr – Port Ellen
Jura – Ormsary
Kilchoan – Tobermory
Craignure – Oban
Ardgour – Onich
Stornoway – Ullapool
Lochmaddy – Leverburgh
Carnan – Dunvegan
Ardvasar – Mallaig
Dervaig – Scarinish
Lochboisdale – Eriskay
Eriskay – North Bay
Evie – Westray

Articles of Interest

Submarine Listening Cables Uncovered on the Shore in Antrim
http://nalil.blogspot.co.uk/2011/01/from-portballintrae-to-islay.html

BT Cable suffers malicious damage in Scotland:https://www.btplc.com/civilresilience/Casestudies/UKResponse/KyleOfLochalsh.html

Interesting Blog (from 2009) about the building of a Sydney CLS
https://www.pipenetworks.com/ppc1blog/category/cable-landing-station-sydney/page/8/