Kamaljit Jit Singh

US Patent:

49598627, Sep 25, 1990

Filed:

Apr 28, 1988

Appl. No.:

7/187305

Inventors:

Mircho A. Davidov - Danville CA
Kamaljit Singh - San Jose CA

Assignee:

Catel Telecommunications, Inc. - Fremont CA

International Classification:

H04N 7167

US Classification:

380 10

Abstract:

An active multichannel video processing hub which provides optinum transition from fiber to coaxial cable, provides optimum trading of bandwidth for signal to noise ratio. Fiber optic links have a very large bandwidth capability. Larger distances can be covered with fiber optic links without repeaters. This offers not only saving in maintenance, but has no radiation and offers bidirectional capabilities not easily achievable with coax-based trunks. Scrambled signals are transmitted over the fiber and converted to VSB-AM signals at the hub for transmission over the coaxial portion of the trunk. This keeps the bulky and complex headend scrambling equipment in one central location instead of spreading it over many hub locations. The inherent heterodyne processing capabilities of the hub permit it to link headends with different frequency plans. Also, the hub-based trunk does not obsolete existing equipment and method of operation.