T-carrier fiber optic modem

Details T-carrier fiber optic modem T-carrier fiber optic modem

1986-11-14

1987-11-24

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455600, 455601, 455612, H04B 900

Patent

active

047094150

ABSTRACT:
A T-carrier fiber optic modem for a telephone central office which allows simple conversion from electrical to optical transmission. An unused slot in a T-carrier span terminating shelf is provided with one optical transmitter/receiver pair for each of the T1 cards in the same shelf. All of the optical fibers are contained in ribbon cables which are connected to this "new" card, with a minimum number of electrical connections being made between the new card and the T1 cards. A minor change in each of the T1 cards "fools" it into thinking that the necessary DC supervisory potential appears on the two receive pins previously connected to a copper twisted-pair cable.

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