OPTICAL SUBSCRIBER'S LINE TRANSMITTER AND STAND-BY SYSTEM OPTICAL TRANSMISSION LINE MONITORING METHOD

Japanese Patent JP3781523

B2

PROBLEM TO BE SOLVED: To monitor the transmission line of a stand-by system by allowing a control means to judge the normality of the optical transmission line of the stand-by system by the delay measurement of the stand-by system by a means executing delay measurement.
SOLUTION: Two optical transmission lines are provided between a center equipment 11 and an optical star coupler 13, and the equipment 11 is provided with two optical subscriber's line interfaces 14 respectively connected to the two optical transmission lines and a control part 15 switching these two interfaces 14 between in-use one and stand-by one. A control part 15 sets one of the two interfaces 14 to an in-use system and a stand-by system at the time of starting communication and executes communication by using the in-use system. In addition, a delay measuring frame from a branch equipment 12 is received any time during communication to execute delay measurement between with the equipment 12 and executes the correction control of the transmitting position of an incoming frame. Delay measurement is executed also by a stand-by system so that the stand-by system can immediately cope with the switching of the in-use system and the stand-by system.

Kengo Hirano
Takeo Tode

JP24301897A

May 31, 2006

September 08, 1997

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NEC
Nippon Telegraph and Telephone Corporation

H04B1/74; H04B10/03; H04B10/032; H04B10/07; H04B10/077; H04B10/27; H04B10/272; H04L12/24; H04L12/26; H04L12/44; (IPC1-7): H04B1/74; H04B10/02; H04B10/08; H04B10/20; H04L12/44; H04L12/24; H04L12/26

JP8065208A
JP8340301A
JP9130834A
JP7198874A
JP2241145A

Naotaka Ide
Toshinao Shimodaira

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