Multiplex communications – Communication techniques for information carried in plural... – Adaptive
Reexamination Certificate
1997-09-11
2001-04-10
Nguyen, Chau (Department: 2663)
Multiplex communications
Communication techniques for information carried in plural...
Adaptive
C370S537000
Reexamination Certificate
active
06215794
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
The invention relates to a multiple band change-over method for the multiplex communication equipment in a multiplex communication system structured by a plurality of multiplex communication equipment, and is suitable to, for example, a multi-media multiplex equipment.
DESCRIPTION OF THE RELATED ART
Conventionally, in a multiplex communication system, the multiple band between equipment are set by structure information (equipment operation data) in order to assure multiplicity between these equipment. According to the conventional method above, the multiple bands must be assured during day and night even though there are some terminals used only during daytime or other terminals used only during nighttime.
If it is necessary to change over assignment of equipment to the multiple band in nighttime and daytime, a maintenance terminal is provided for every multiplex communication equipment, and a change management of the structure information is carried out by the maintenance terminal, or a maintenance surveillance center is connected to individual multiplex communication equipment through a public network in order to carry out a change-over management of the structure information.
According to the conventional method, when the maintenance terminal is provided every the multiplex communication equipment and the maintenance terminal changes over assignment of the multiple bands by the management of changing over the structure information, it is necessary to dispatch maintenance engineers, resulting in an increase of the maintenance cost. In addition, it is inconveniently necessary to keep a good communication in the network in order to prevent errors of the change-over time in the network from being generated.
In case that the maintenance surveillance center is connected to individual multiplex communication equipment through the public network and the management of changing over the structure information is done, each point or place must be individually changed, resulting in an inconvenience of generating a large time error before the management of changing over the structure information of whole network has been finished.
Also, when the multiple bands is changed over by changing over the structure information, the communication is temporarily disconnected. As a result, the communication user (user of the sound terminal) will experience the sudden disconnection. This gives an unpleasant impression to user.
SUMMARY OF THE INVENTION
The present invention solves such conventional problems. An object of the present invention is to provide a multiple band change-over method for multiplex communication equipment, by changing over the multiple band easily and with low-cost.
The invention includes, in a multiplex communication system provided with a plurality of multiplex communication equipment connected to each other by means of an exclusive line, a multiple band change-over method of the multiplex communication equipment having a plurality of structure information for setting the multiple bands, by which method the structure information faces are changed over on the basis of the previous set schedule in order to change over the multiple bands.
In another aspect of the invention, the previous-set schedule is set on the basis of the time information, and the structure information faces are changed over every time that is previously set.
In another aspect of the invention, the information of the inner clock of the master multiplex communication equipment in the plurality of the multiplex communication equipments is set in the inner clock of another multiplex communication equipment of a network, for every predetermined period or for a clock change of the master multiplex communication equipment.
In another aspect of the invention, when a disconnection in communication is going to happen due to a change-over of the structure information faces, the disconnection will happen at a fixed time before changing over the structure information faces that is noticed to a sound terminal connected to the multiplex communication equipment.
In another aspect of the invention, when a disconnection in communication is going to happen due to a change-over of the structure information faces, a sending operation is restricted from a fixed time of changing over the structure information faces to a time when the structure information faces are changed over.
According to the invention, multiple bands are changed-over according to the previous-set schedule, for example, time without a manual operation by the maintenance engineer with reference to any change of multiple bands, so it is possible to effectively use an exclusive line.
Also, when the multiple bands are changed over according to time, the inner clock of the master multiplex communication equipment and an inner clock of another multiplex communication equipment are made coincident with each other periodically or for every clock change of the master multiple communication equipment, so that it is possible to make the change error in the network very small.
According to the invention, when the communication is temporarily disconnected due to changing over from one structure information to another structure information, the user is made aware of this in advance, and so it is possible to avoid an unpleasant situation for the user.
REFERENCES:
patent: 5392284 (1995-02-01), Sugiyama
patent: 5577075 (1996-11-01), Cotton et al.
patent: 5673253 (1997-09-01), Shaffer et al.
patent: 5708664 (1998-01-01), Budge et al.
patent: 5721738 (1998-02-01), Kubota et al.
patent: 5793425 (1998-08-01), Balakrishnan
Aso Ikuo
Azuma Kazumasa
Suzuki Kaoru
Watanabe Sakae
Foley & Lardner
Hitachi Telecom Technologies Ltd.
Lee Chiho Andrew
Nguyen Chau
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