Title:
OPTICAL PDS SYSTEM
Document Type and Number:
Japanese Patent JP3481556
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide optical PDS(Passive Double Star) system that can enhance the security between slave station units connected to a master station unit and between user terminals connected to the slave station unit.
SOLUTION: The master station unit 1 (slave station unit 2) is provided with a password generating circuit 118 (226) that generates a password corresponding to each user terminal in the unit of one frame. The master station unit 1 (slave station unit 2) updates a password into a password outputted from the password generating circuit 118 (226) depending on a transmission state to conduct security processing or security release processing.
Inventors:
Atsushi Satake
Application Number:
JP2000148953A
Publication Date:
December 22, 2003
Filing Date:
May 19, 2000
Export Citation:
Assignee:
NEC Communication Systems, Ltd.
International Classes:
H04L9/08; H04B10/07; H04B10/27; H04B10/272; H04B10/556; H04L12/44; (IPC1-7): H04L12/44; H04B10/20; H04L9/08
Domestic Patent References:
| JP1168733A | ||||
| JP9191318A | ||||
| JP11220464A | ||||
| JP10327143A | ||||
| JP2264534A |
Attorney, Agent or Firm:
Rock wall Fuyuki