| 摘要 |
<p>A communications connection comprises intermediate connection points 6,11 connected by a non-conducting communications link 20, with conversion equipment in one or both intermediate points for converting communications between electrical and non-electrical carriers, and each being arranged to be powered from the respective ends 1, 12. If a metallic path 18 is present between the two intermediate points, the system can be arranged to use this for a limited connection service in the event of loss of electrical power to one or both of the intermediate points 6,11</p> |
