05631931 is referenced by 11 patents and cites 16 patents.

A bus type clock supplying system in a communication system with master-slave synchronization includes communication cards connected with transmission lines within a communication system and a clock bus. Each communication card includes a clock supplying section including a frequency divider for extracting a clock from the transmission lines and a tri-state device outputting the clock to the clock bus; a clock receiving section including a clock selector for selecting one clock from a plurality of the bus-type clock lines, and a frequency multiplier for multiplying the frequency of the selected clock; and a monitoring and controlling section having a function of monitoring interruption of clock input, abnormalities in the frequency multiplier, etc., and a function of controlling the tri-state device and the clock selector.

Title
Bus type clock supplying system for providing a clock in a communication system with a plurality of clock bus lines
Application Number
8/219525
Publication Number
5631931
Application Date
March 29, 1994
Publication Date
May 20, 1997
Inventor
Toshihide Fujio
Yokohama
JP
Masataka Takano
Yokohama
JP
Agent
Fay Sharpe Beall Fagan Minnich & McKee
Assignee
Hitachi Communication Systems
JP
Hitachi
JP
IPC
H04B 7/12
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