Clock supply apparatus
AssigneeFujitsu Limited
InventorTadanao Shinomiya
Life of this patent
Estimating the term…
Abstract
A clock supply apparatus provided in each slave office, wherein a single master clock is received at a clock receiver unit; 0-system and 1-system system clocks are paired and are distributed to the transmission units at terminal ends via a plurality of duplexed clock supply routes; and multistage clock selection units are hierarchically inserted into the duplexed clock supply routes. The system-selection unit for controlling the selection of the 0-system or 1-system at each clock selection unit is given a 0-system and 1-system duplexed structure and is constituted by a system switching command unit for instructing this system-selection.
Claims11
A clock supply apparatus provided with a plurality of duplexed clock supply routes which receive a single master clock at a clock receiver unit, generate a system clock duplexed to a 0-system and a 1-system, pair said 0-system and 1-system system clocks, and supply the same to each of the transmission units of a plurality of line systems;
- multistage clock selection units which are hierarchically inserted into said duplexed clock supply routes from the aforementioned clock receiver unit to said transmission units and perform the aforementioned alternate selection of the 0-system or 1-system;
- and system-selection units which control the aforementioned alternate selection of the 0-system or 1-system with respect to said clock selection units, wherein
- the aforementioned system-selection unit is duplexed to a 0-system system-selection unit and a 1-system system-selection unit and, at the same time, a system switching command unit instructing which of these system-selection units is to be selected is provided.
Dependencies are inferred from the claim text.