This will contain optical fibres and a power conductor. To ensure maximum protection against external influences, several types of cable with different external armouring will be deployed, according to sea-bed conditions.
Repeaters amplify the optical signal at regular intervals (about 30 to 50 miles depending on the total segment length) along the submarine cable to periodically compensate for signal attenuation within the optical.
This is necessary to correct optical bandwidth distortion arising as a result of the long distances between regeneration points.
Branching Unit (BU)
These allow the cable to be split, providing electrical and optical submarine interconnection for up to three submarine cables.