Device, method and program for monitoring wired TV transmission path

A transmission path, cable TV technology, applied in the direction of line transmission monitoring/testing, broadcast monitoring/testing/troubleshooting device, cable transmission adaptation, etc., can solve problems such as service stop

Inactive Publication Date: 2008-12-31
OSS BROADNET
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem that when blocking control is performed on the door switch in order to isolate upstream intrusive noise, services such as primary IP telephone services are stopped

Method used

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  • Device, method and program for monitoring wired TV transmission path
  • Device, method and program for monitoring wired TV transmission path
  • Device, method and program for monitoring wired TV transmission path

Examples

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Embodiment Construction

[0083]1A and 1B are block diagrams depicting an embodiment of an upstream intrusion noise monitoring system according to the present invention. In FIGS. 1A and 1B, optical nodes 26-1 to 26-4 are arranged behind the head end 20. In FIG. As a representative, in the optical node 26-1, a CATV transmission path provided from upstream to downstream with a tree structure starting from this optical node is described. In this example, a bidirectional amplified main line amplifier (TBA) 28 is provided behind the optical node 26-1 via a bridge gate switch (hereinafter simply referred to as “gate switch”) 30-1, and the branch terminal of the main line amplifier 28 The door switches 30-2 to 30-4 are connected to collective houses 34-1 to 34-3, respectively. In addition, the branches of the main line amplifier 28 also have cable modems 32-1 and 32-2 respectively connected thereto. The fault detection server 10 is connected to the headend 20 via a wired router device 18 . A fault analysis...

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Abstract

The invention provides a device, method and program for mornitoring CATV transmission path. Gate switches can switch an amount of attenuation, and are set in a distributed manner on distribution lines and a trunk on subscribers' house side in a CATV transmission path having a tree structure with an optical node that follows a headend being taken as a starting point. An upstream-transmission-quality monitoring unit monitors an S / N ratio of an upstream signal obtained from an upstream port having the headend connected thereto to detect a decrease in upstream transmission quality based on a degree of decrease and a continuation state of an S / N ratio. When the upstream-transmission-quality monitoring unit detects a decrease in upstream transmission quality, a noise-generation-source searching unit performs a sequential switching control over the amount of attenuation at the gate switches provided on the CATV transmission path from upstream to downstream to search for a source of generation of upstream ingress noise.

Description

technical field [0001] The present invention relates to the intrusion noise monitoring system and method for detecting the degradation of upstream transmission quality due to the upstream ingress noise in the CATV system to search for the source of the noise generation, and more particularly to a An intrusion noise monitoring system and method for automatically searching upstream intrusion noise generation sources for controlling insertion and separation of attenuators by gate switches on trunk and branch lines of a path. Background technique [0002] Conventionally, there has been a problem that in a CATV transmission path having a tree structure, when noise occurring in a user's home on the upstream side is mixed into the upstream transmission path, the noise propagates from the upstream side to the downstream side and becomes intrusive noise, thereby reducing The signal quality of the service channels assigned to the upstream transmission band from 5 to 42 MHz is determin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N17/00H04N7/10H04N7/173H04B3/46H04H20/12H04H60/97H04N7/16H04N21/61H04N21/647
CPCH04H20/12H04H20/78H04N17/00
Inventor 西出诚宫副英治保坂茂树
Owner OSS BROADNET
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