JPH0498989A - Branching device and distributer for two-way catv system and its line control method - Google Patents

Abstract

PURPOSE:To prevent incoming confluent noise from a non-subscriber and to prevent immediately incoming confluent noise even against a change in a subscriber and a non-subscriber by controlling switching of an incoming line for each distribution system in a 2-way CATV system. CONSTITUTION:A central processing unit 1 of a center registers and manages individual management information as to whether a party accommodated to each distribution system of a CATV branching device and distributer 5 is a subscriber or a non-subscriber or the like. The individual management information is fed to the CATV branching device and distributer 5 via a head end 3 and a transmission line 4 as a control signal by a status monitor controller 2. A status monitor 52 of the CATV branching device and distributer 5 recognizes the subscriber non-subscriber individual management information by the received control signal, closes a bridger gate switch 54 corresponding to the distribution system accommodating the subscriber based on the individual management information and opens the bridger gate switch 54 corresponding to the distribution system accommodating the non-subscriber based on the individual management information.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention provides a two-way CA that accommodates subscribers who use uplinks and downlinks and non-subscribers who use only downlinks.
The present invention relates to a branch/distributor for a TV system and a line control method thereof.

[Conventional technology]

Conventionally, a two-way CATV system accommodates subscribers who make a system usage contract and use uplinks and downlinks. In addition to these subscribers, we also accommodate non-subscribers who do not have a system usage contract and only use the downlink to prevent viewing problems.

In order to prevent upstream noise from being generated through the unused uplink lines of unsubscribers, boosters, converters, or filters are installed between unsubscribers and subscriber connection terminals that connect unsubscribers. Ta.

[Problem to be solved by the invention]

In the conventional method of installing a booster, converter, or filter between the non-subscriber and subscriber connection terminals described above,
There are few benefits for non-subscribers, it is difficult to implement, and it may not be possible to prevent upstream noise, as it may drop due to carelessness when switching connections.

Furthermore, there is a drawback that it is not possible to immediately prevent upstream noise due to the flow of subscribers and non-subscribers.

[Means to solve the problem]

The branch/distributor of the bidirectional CATV system of the present invention is as follows:
In a branch/distributor that accommodates subscribers who use uplinks and downlinks and non-subscribers who use only downlinks in a two-way CATV system, the number of subscribers and non-subscribers corresponding to each distribution system is a plurality of subscriber connection means for accommodating one of the plurality of subscriber connection means; a distribution means for distributing downlinks to each of the plurality of subscriber connection means; and a mixing means for mixing uplinks of each of the plurality of subscriber connection means; , a plurality of bridge gate switches for opening and closing connections of respective uplink lines between the plurality of subscriber connection means and the mixing means, and individual management of the subscribers and non-subscribers of each distribution system from a center. and a stator monitor that receives information and controls opening and closing of the corresponding bridge gate switch.

The line control method for a branch/distributor in a bidirectional CATV system according to the present invention includes a branch/distributor line control method for a bidirectional CATV system.
Individual management information that accommodates either subscribers or non-subscribers for each distribution system of the distributor is registered in advance in the center, the registered individual management information is transmitted to the branch/distributor, and the This configuration controls the opening and closing of the corresponding bridger gate switch via a status monitor to prevent mixing of uplinks of the non-subscribers.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 shows a bidirectional CA for explaining one embodiment of the present invention.
FIG. 1 is a block diagram of a TV system. The center includes a central processing unit 1 that manages individual management information of subscribers and non-subscribers;
It includes a status monitor control device 2 that converts individual management information from the central processing unit 1 into a control signal for the status monitor, and a head end 3 that sends out the control signal, and a transmission line 4.
It is connected to the CATV branch/distributor 5 via.

The CATV branch/distributor 5 includes a bidirectional filter 51 connected to the transmission path 4, a plurality of bidirectional filters 56 that connect subscribers or non-subscribers for each distribution system, and a bidirectional filter 51 connected to the transmission path 4. a distributor 55 that distributes the downlink signal from the transmitted transmission line 4 to each of the bidirectional filters 56;
, a plurality of bridge gate switches 54 that open and close uplinks from the corresponding bidirectional filters 56 , and a plurality of uplink signals that have passed through the bridgegate switches 54 are mixed and routed through the bidirectional filters 51 to the transmission line. 4, and a status monitor 52 that receives a control signal from the transmission line 4 and controls the opening and closing of the corresponding bridge gate switch 54.

Next, the operation will be explained.

The central processing unit 1 of the center registers and manages individual management information such as whether those accommodated in each distribution system of the CATV branch/distributor 5 are subscribers or non-subscribers. This individual management information is sent as a control signal by the status monitor control bag W2 to the CATV branch/distributor 5 via the head end 3 and transmission #r4.

The status monitor 52 of the CATV branch/distributor 5 recognizes the individual management information of subscribers and non-subscribers from the received control signal, and responds to the distribution system in which the subscriber is accommodated based on this individual management information. Bridger gate switch 5
4 is closed, and the bridge gate switch 54 corresponding to the distribution system in which the non-subscriber is accommodated is opened.

As a result of the above, the uplink of non-subscribers is cut off from the transmission path 4.

〔Effect of the invention〕

As explained above, the present invention controls the opening and closing of uplinks for each distribution system in a two-way CATV system, thereby preventing upstream noise from non-subscribers and improving the flow of subscribers and non-subscribers. This also has the effect of immediately preventing upstream noise.

Furthermore, since it is possible to easily connect non-subscribers to the two-way CATV system, it can be expected to have the effect of encouraging non-subscribers to switch to becoming subscribers.

[Brief explanation of the drawing]

FIG. 1 shows a bidirectional CA for explaining one embodiment of the present invention.
FIG. 1 is a block diagram of a TV system. l...Central processing unit, 2...Status monitor control device, 3...Head end, 4...Transmission path, 5CA
TV branch/distributor, 51.56... bidirectional filter, 52... status monitor, 53... mixer,
54...Bridger gate switch, 55...Distributor.

Claims (1)

[Scope of Claims] 1. In a branch/distributor that accommodates subscribers who use uplinks and downlinks of a bidirectional CATV system and non-subscribers who use only downlinks, the a plurality of subscriber connection means for accommodating either subscribers or non-subscribers; distribution means for distributing downlinks to each of the plurality of subscriber connection means; and a distribution means for each of the plurality of subscriber connection means. a mixing means for mixing uplinks;
a plurality of bridge gate switches for opening and closing connections of respective uplink lines between the plurality of subscriber connection means and the mixing means; and individual management information of the subscribers and non-subscribers of each distribution system from a center. and a stator monitor that receives and controls opening/closing of the corresponding bridge gate switch. 2. A branch for the bidirectional CATV system according to claim 1.
Individual management information that accommodates either subscribers or non-subscribers for each distribution system of the distributor is registered in advance in the center, the registered individual management information is transmitted to the branch/distributor, and the A line control method for a branch/distributor in a bidirectional CATV system, characterized in that opening/closing of the corresponding bridge gate switch is controlled via a status monitor to prevent mixing of uplink lines of the non-subscribers.