ANCS (Active Noise Cut System)
ANCS (Active Noise Cut System)
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ANCS is a total solution system for ingress noise of upstream CATV lines.
It provides efficient solution for noises caused by Internet upstream line or IP phones due to the reset digital CATV.
By placing NCB (Noise Cut Box) near the origin of ingress noise, it monitors the noise of upstream line 24-7 and reports the monitored data to the central system while performing auto-circuit control.
NCB can be installed next to the protective device at the entrance of housing complexes or apartments to communicate with central monitoring system.
It can contribute to the diffusion of IP phone when installed at 3000 ~ 5000 apartment complexes within the CATV network, or it can be used as a solution to particular apartment complexes with noise problems. In some cases, it can be installed in all the apartment complexes within a specific area.
ANCS is designed to detect and measure the noise occurring near the origin of ingress noise and quickly contain the influence of such noise to a minimum level.
It also provide the signal quality management of CATV lines as well as data and guidelines to improve upstream lines.
|* Noise Measurement||
NCB (Noise Control Box) terminal measures the noise (33dBuV~75dBuV) occuring in upstream lines. The error margine is as low as ±3dBu.
|* Auto Terminal Control||
Automatically and accurately conotrols the upstream lines according to the measured noise and the specified control table.
PASS the upstream signals regardless of the noise.
Insert an attenuator 1dB~25dB (stepless) according to the measured noise and the specified table.
Insert an attenuator above 45dB to CUT the upstream line and block the influence of ingress noise when the noise reaches a specified level.
4) Show the gradual
Central control PC shows green (good), yellow (attention), red (danger) inditcators according to the noise leve.
|* Central control box||NCB sends the self conditions and measuring data to the Central Box (CB) and control PC through FSK connection. All the NCB control and data stroage/analysis are done by the control PC through the Control Box. Each NCB can be managed by the Central Box.|
|* The max number of NCB||3000 units of NCB (with ID numbers) can be collectively controlled.|
1. Noise Cut Box NCB-01
|1) Noise Measurement Frequency||
20MHz ～ 53MHz
2) Noise Measurement Range
| 33dBuV ～ 75dBuV
|3) Noise Measurement Method||
Analog Peak Hold Method
|4) Noise Measurement Accuracy||
|5) Downstream Line Segment||Less than 60MHz / Insertion Loss less than 3dB|
|6) Upstream Line Segment||Less than 60NHz / Insertion Loss less than±1dB|
|7) Auto Control Segment||PASS: less than ±1dB|
|ATT: auto variable attenuator 1-25dB|
|CUT: 45dB or above|
|8) ID||Allocated 0000 - 9999 decimal numbers at factory|
|9) Noise Level Recording frequency and time||
Record 2 decimal noise valie every 10 minutes and sends to Central Box as boaring.
|10) Auto Mode||Auto controlled by "attenuator table" (can be configured from CB)|
11) Manual Mode
|Can be configured as PASS/ATT/CUT (eigher two) from PC|
|12) LED Display|
|13) FSK Data Transfer*||Upstream (transmitting) any frequency between 30MHz～50MHz|
|14) FSK Data Transfer*||Downstream (receiving) any frequency between 70MHz～770MHz|
|15) Exclusive FSK Data Transfer Frequency Range||App. within 700KHz|
|16) Power||Adapter IN=AC100V, OUT=DC12V800mA|
|NCB Power DC12V App. 400mA|
|16) Size and weight||W 39mm x D154(184mm including mounting hook) x H69mm App. 350g|
2. Central Box CB-01
|1) FSK Data Transfer *||
Upstream (Receiving) Any Frequency between 30MHz～50MHz
2) FSK Data Transfer*
|Downstream (Transmitting) Any Frequency between 70MHz～770MHz|
|3) PC Connection||RS232C|
|4) Power||AC100V App. 50VA|
|5) Size and Weight||W 136mm x D 258mm x H 57mm (including rubber feet) App.950g|
NOTE: " * " marked frequency can be selected by users.