Patent ID: 8135086

Claim:
A system comprising a first port, a second port, a third port, a fourth port, and a circuit network interconnecting the first, second, third, and fourth ports, and adapted to: a) provide bidirectional passage of signals within a first frequency band between the first and fourth ports, wherein a first signal at a first frequency, the first frequency being within the first frequency band, travels in a first direction between the first and fourth ports across a cable and a second signal at a second frequency, the second frequency being within the first frequency band, travels in an opposite direction from the first direction between the first and fourth ports across the cable; b) provide bidirectional passage of signals within a second frequency band between the second and fourth ports, wherein a third signal at a third frequency, the third frequency being within the second frequency band, travels in a first direction between the second and fourth ports across the cable and a fourth signal at a fourth frequency, the fourth frequency being within the second frequency band, travels in both a first direction and an opposite direction from the first direction between the second and fourth ports across the cable; and c) provide bidirectional passage of an additional signal between the third and fourth ports, wherein the additional signal travels in a first direction, an opposite direction from the first direction, or in both the first direction and the opposite direction, between the third and fourth ports across the cable.