Title:
【発明の名称】同期確立方法
Document Type and Number:
Japanese Patent JP3101051
Kind Code:
B2
Abstract:
The invention provides a synchronism establishing method and apparatus including a plurality of modules having different independent synchronization patterns to be switched wherein the switching transition process having a time length corresponding to the number of protection stages necessary for pull in and protection of synchronism is reduced so small that the presence of such switching transition process can be ignored while assuring similar advantages to those of conventional synchronism establishing apparatus. A master side module delivers a notification of establishment of synchronism thereof to a slave side module. When the slave side module is in a condition wherein synchronism is established, it puts its synchronizing operation into a waiting mode. Even if it thereafter detects a number of abnormal synchronization patterns greater than the number of protection stages, it does not determine a pull out condition and maintains the pulled in phase. If the slave side module detects a false pull out condition from the master side module, the slave side module determines that synchronism is entered therewith and resumes its processing operation.
Inventors:
Takashi Fujino
Koji Okazaki
Mitsuru Tsuboi
Naoshi Matsuo
Naomi Nishiyama
Toshiaki Nobumoto
Koji Okazaki
Mitsuru Tsuboi
Naoshi Matsuo
Naomi Nishiyama
Toshiaki Nobumoto
Application Number:
JP1366392A
Publication Date:
October 23, 2000
Filing Date:
January 29, 1992
Export Citation:
Assignee:
富士通株式会社
International Classes:
H04J3/06; H04J3/12; H04L7/00; H04N1/327; H04Q11/04; (IPC1-7): H04J3/06; H04L7/00
Domestic Patent References:
| JP3187638A | ||||
| JP5327652A |
Attorney, Agent or Firm:
Yu Sanada