FIELD: electricity.
SUBSTANCE: symmetric unshielded 25-pair cable of category 5e with improved characteristics contains strands in polymer insulation twisted into pairs to form a common core in lays as follows: three twisted pairs in the first lay, nine twisted pairs in the second lay and thirteen twisted pairs in the third pay in common polymer sheathing; each pair in the cable is twisted at a pitch different from that of the other pairs; in the first lay the pitch consists of three pairs with a triradial polymer separation element introduced separating the pairs of first lay from each other; between the first and the second lays a separation polymer tape is introduced with edge overlapping along the whole of the cable length; equally, between the second and the third lays a separation polymer tape is introduced with edge overlapping along the whole of the cable length; in the second lay a polymer separation element is introduced occupying an area of one pair in cross-section and along the whole length; introduced in the second lay are four similar separation elements, three of them separating each three pairs in the lay from each other while the fourth separating four pairs in the lay from each other along the whole of the cable length.
EFFECT: decreased proximity effect pair and reduced mutual influence between the pairs.
1 dwg
