Title:
【発明の名称】通信ネットワークと周波数同期確立方法
Document Type and Number:
Japanese Patent JP2644413
Kind Code:
B2
Abstract:
An asynchronous, fiber optic, ring network (10) includes a number of nodes where data enters and exits the network. Each of these nodes has its own clock (640) to provide timing needed by equipment at that node. So that synchronous data can be transmitted between predetermined nodes, a master node (100, 200) provides timing information which may be used at any node to synchronize its clock. Timing information comprises the propagation delay around the ring (ring latency) as measured by the master node. This measure of propagation delay is transmitted by the master node as an information packet (310) available at all nodes. Synchronization of any other node (110,300) with the master requires that the other node perform its own measurement of propagation delay, compare its measurement with that of the master node, and make adjustments to its own clock that tend to decrease the difference between these measurements.
Inventors:
SUKOTSUTO II FUARIIFU
Application Number:
JP8292692A
Publication Date:
August 25, 1997
Filing Date:
March 06, 1992
Export Citation:
Assignee:
EI TEI ANDO TEI CORP
International Classes:
H03L7/06; H04J3/06; H04J14/08; H04L7/00; H04L7/033; H04L12/42; (IPC1-7): H04L12/42; H03L7/06; H04L7/00; H04L7/033
Domestic Patent References:
| JP6399645A | ||||
| JP63119341A | ||||
| JP25654A | ||||
| JP616954A | ||||
| JP61245731A |
Attorney, Agent or Firm:
Hirofumi Mimata