JP5155376B2 - CATV system line device level setting method, CATV system line device, and CATV system line device level setting device - Google Patents

Description

  The present invention relates to an upstream signal such as an optical node, a trunk amplifier (TA), a trunk branching amplifier (TBA), a trunk distribution amplifier (TDA), an extension amplifier (EA), etc., which is inserted into a CATV system transmission line. The present invention relates to a method for setting the level of either or both of the downstream signal and the downstream signal, a CATV system line device capable of setting the level, and a level setting device for the line device.

Since conventional CATV system line equipment has fixed gain, attenuation, frequency characteristics, etc. (hereinafter referred to as “equipment characteristics”), the input / output levels of upstream and downstream signals are determined according to the equipment characteristics. The system was designed and a CATV system was constructed. Therefore, there were the following difficulties.
1. Even if it is the same manufacturer's product, the input / output level will be different if the line device group is different, and the input / output level will be different for other manufacturers' line devices even if the line device is the same. When I went and built a CATV system, I couldn't change the system easily after that. It was also difficult to adopt a new model because the input / output levels were different.
2. Even if it becomes necessary to replace the line equipment due to the failure or malfunction of the line equipment, the line equipment cannot be exchanged and it becomes difficult to cope with it. In this case, it is conceivable to stock the line equipment of the same input / output level as the line equipment being laid, but since there are many types of equipment as described above, It becomes a huge quantity, requires a large storage space, and is difficult to manage. Also, if the manufacturer does not produce a successor model, there is no line equipment to replace, which is a big problem for the CATV system.

In order to solve the above-mentioned difficulties, a CATV system line device having the configuration shown in FIG. 3 has been developed. The track equipment in FIG. 3 has the following configuration.
Between the downlink input / uplink output terminal (terminal for connecting the downlink input signal and the uplink output signal to the outside) 1 and the downlink output / uplink input terminal (terminal for connecting the downlink output signal and the uplink input signal to the outside) 14 / Uplink demultiplexing filter (filter for demultiplexing downstream signal and upstream signal) 2, downstream input level adjustment attenuator (attenuator for adjusting downstream signal arrival level: plug-in system, electronic variable ATT, etc.) 3a, downstream Input level adjustment equalizer (adjustment circuit for adjusting downstream signal arrival level: plug-in type adjustment circuit, slope circuit, etc.) 3b, downstream first stage amplifier (circuit for amplifying downstream signals: IC, etc.) 4, TWIST GC (coaxial cable) 5) Downstream input level setting attenuator (attenuation circuit that can arbitrarily change the downstream signal input level: plug-in system or electrical circuit) Sub-variable ATT, etc. 6, branching device (circuit that branches the signal to the AGC circuit) 7, detection filter (circuit that extracts the AGC pilot signal from the branched signal: bandpass filter, etc.) 8, AGC detector (AGC) Circuit for detecting pilot signal: IC, etc. 9, branching device (circuit for branching downlink status signal) 10, downlink output level setting attenuator (attenuator capable of arbitrarily changing downlink output level: plug-in method, etc. Electronic variable ATT etc. 11, downstream final stage amplifier (circuit for amplifying downstream signal: IC etc.) 12, downstream / upstream demultiplexing filter (filter for demultiplexing downstream signal and upstream signal) 13, upstream input level setting Attenuator (attenuator capable of arbitrarily changing upstream signal input level: plug-in type, electronic variable ATT, etc.) 15, upstream first stage amplifier (circuit for amplifying upstream signal: IC, etc.) 16 Mixer (circuit for mixing upstream status signal) 17, upstream final stage amplifier (circuit for amplifying upstream signal: IC, etc.) 18, upstream output level adjustment attenuator (attenuator for adjusting center arrival level of upstream signal: plug) In-type or electronic variable ATT, etc.) 19a, upstream output level adjustment equalizer (circuit for adjusting the center arrival level of the upstream signal: plug-in type adjustment circuit, slope circuit, etc.) 19b, status monitor (STM) 20 Inserted (connected).

The track apparatus of FIG. 3 has the following advantages.
1. Since the setting of the downstream input level can be changed by changing the downstream input level setting attenuator 6 of FIG. 3 to an arbitrary value, it is possible to deal with models having different input levels.
2. Since the output level can be changed by changing the downstream output level setting attenuator 11 in FIG. 3 to an arbitrary value, the output level can be adapted to different models, and the CSO ( Compound secondary distortion) and CTB (composite third distortion) can also be improved.
3. Since the setting of the upstream input level can be changed by changing the upstream input level setting attenuator 15 in FIG. 3 to an arbitrary value, it is possible to deal with models having different input levels.
4). By responding as in the above 1-3, the types of track equipment can be reduced, and the number of maintenance stock models can be reduced.
5. It has a high degree of freedom and can be used for various devices.

  There is also an invention of Patent Document 1 as a CATV line device. This is a CATV line device (amplifier) that does not have an output level adjustment function, and an appropriate output level can be secured by using an attenuator.

JP2002-300552

The line device of FIG. 3 has the following problems.
1. The downstream input level setting attenuator 6, the downstream output level setting attenuator 11, and the upstream input level setting attenuator 15 in FIG. 3 are many optional line devices that are sold separately, so various input / output level settings are possible. When changing, it will take replacement work and cost.
2. When setting the input / output level, it is necessary to calculate the value of the level setting circuit for each system, which is troublesome.
3. It is necessary to manually set the input / output levels one by one, and the setting operation is troublesome.
4). Since the set output level of each line device is different, if the number of line devices increases, it is difficult to record and manage the output level set for each line device.
5. Since the input / output level settings (specifications) are different for each CATV operator (for example, CATV system operating company), the track equipment manufacturer matches the input / output levels of the manufactured track equipment to the specifications of the CATV operator. It must be set, the setting work is troublesome, and management by model is also troublesome.

  In Patent Document 1, a signal attenuator that can adjust the signal level is provided between the signal input terminal and the signal output terminal. However, the attenuation of the signal attenuator is adjusted manually, and is automatically adjusted. It is not possible.

  An object of the present invention is to enable automatic level setting to solve the problems of the prior art lines, and to facilitate maintenance and management of equipment after level setting.

  The present invention relates to the level setting of CATV system line equipment (hereinafter simply referred to as “line equipment”) connected to the CATV system transmission line, and in particular, before the equipment characteristics of the line equipment are shipped from the factory. Or a level setting method, a level setting device, and a level setting device suitable for setting the level of an upstream signal and / or downstream signal through the line equipment by adjusting before laying in the CATV facility Is to provide.

Level setting of the line equipment CATV system of the present invention, by adjusting the equipment characteristics of the line equipment, a method for setting the level of one or both of the signals of the uplink and downlink signals (input / output signal), the The line equipment includes a level setting circuit capable of setting the equipment characteristics of the line equipment, an electronic control unit capable of setting the level by controlling the level setting circuit, and a terminal connection terminal capable of connecting the management terminal . to the terminal connection terminal of the line equipment not laid in the transmission path of the CATV system to connect the management terminal unit that is provided separately from the CATV system, the management terminal from the management terminal device to the line device by sending a set value which is previously registered in the vessel, the electronic control unit of the line equipment that has received the setting value based on the setting value, the said level setting circuit of the line equipment automatically adjusted It is for setting the input / output level of road equipment automatically.

In the level setting method for a CATV system line device according to the present invention, in the level setting method, the terminal device connection terminal of the line device that is not laid on the transmission line of the CATV system is connected to the line device during characteristic adjustment. With the management terminal, in addition to the level setting circuit in the line device, status setting of other setting circuits provided in the line device or / and address setting of the status monitor and storage and management of setting data transmitted to the line device Can also be done.

The CATV system line device according to the present invention is a CATV system line device, wherein the line device includes a downlink input / uplink output terminal and a downlink output / uplink input terminal, and a level setting electronic control unit is provided between the terminals. When the levels set circuit adjust the equipment characteristics, and other setting circuit comprises a detachable terminal connection terminal management terminal unit that is provided separately from the CATV system, the other setting circuit, at least the flow It is one or more of a combined noise detection circuit, a gate control circuit that controls opening / closing of a gate that blocks or passes inflow noise, and an upstream band switching circuit, and the electronic control unit is laid in a transmission path of the CATV system the connection has been CATV system the terminal connection terminals of non line equipment is controlled by another management terminal unit, said level setting circuit, control the electronic control unit by the management terminal unit It is automatically adjusted by, in which as the level set of input / output signals of the line device is automatically performed.

The CATV system line device level setting device of the present invention is a device for setting the level of a CATV system line device, and is detachable from the CATV system line device and the terminal connection terminal of the line device according to claim 3. The management terminal is prepared separately from the CATV system, and at least the data required for setting the downlink / uplink input level and output level, and the setting of the device for level setting are registered. When adjusting device characteristics, it can be connected to the terminal connection terminal of the line equipment that is not laid on the transmission line of the CATV system , and preset in the management terminal in the electronic control unit of the connected line equipment is controllable electronic control unit of the line equipment to transmit a set level that is, the line device, based on a set level of the electronic control unit is transmitted from the management terminal unit When controlled, the level setting circuit of the line equipment is automatically adjusted, in which level setting input / output signal line device is automatically performed.

The level setting device for a line device for CATV system of the present invention is the level setting device, wherein the management terminal sets the state of the setting circuit other than the level setting circuit in the line device in addition to the setting of the input / output level Alternatively, address setting of the status monitor in the track device and setting data transmitted to the track device can be stored and managed. The management terminal is registered with various data necessary for setting these levels, including at least the standard settings for the downlink / uplink input levels and output levels, and can also register arbitrary level settings. By selecting a registered line device, it is also possible to set the level of the input / output signal of the line device without inputting the set values one by one. In addition to setting the input / output level of the down / up line, the line device can also set the monitoring address of the status monitor center software and the state of other setting circuits of the line device.

The level setting method of the line equipment for the CATV system of the present invention has the following effects.
1. When the level setting value is output from the management terminal to the line device, the input / output level of the line device is automatically set. Therefore, the setting time is shortened, and erroneous setting by the setting person is eliminated.
2. Since the level setting value (data) output to the track equipment can be stored in the management terminal, the management of the equipment is easy.
3. Since other setting circuits in the line device can also be set, various settings of the line device can be automatically performed.
4). Since the address of the status monitor can also be set, maintenance and management of the line equipment after laying on the transmission line becomes easy.

The line equipment for the CATV system of the present invention has the following effects.
1. Since the line device has an electronic control unit capable of setting the level and a level setting circuit capable of electronically adjusting at least the device characteristics, the electronic control unit is controlled by a management terminal connected to the line device, and the level is set. If the device characteristics of the setting circuit are automatically adjusted, the level setting of the track device is automatically performed, thereby reducing the number of workers, reducing the adjustment work, speeding up, improving the adjustment accuracy, and the like.

The level setting device for the line equipment for the CATV system of the present invention has the following effects.
1. A line device includes an electronic control unit capable of setting a level and a level setting circuit capable of electronically adjusting at least gain and frequency characteristics, and a management terminal connected to the line device controls the electronic control unit to set the circuit. Therefore, it is possible to easily set the level of the line equipment.
2. The management terminal can set the circuit other than the level setting circuit in the line device, set the address of the status monitor in the line device, and save and manage the data set in the line device. If the level setting and address setting of the line equipment is performed with the level setting device of the invention, it becomes possible to maintain and manage the line equipment after laying in the CATV system.

The connection explanatory drawing of the management terminal unit and line apparatus of the level setting apparatus of the line apparatus for CATV systems of this invention. Explanatory drawing which shows an example of the track apparatus for CATV systems of this invention. Explanatory drawing of the track equipment for the conventional CATV system.

  An example of a level setting method for a CATV system line device, a CATV system line device, and a CATV system line device level setting apparatus according to the present invention will be described below with reference to the drawings.

  As shown in FIGS. 1 and 2, the CATV system line equipment level setting method of the present invention connects a management terminal B, for example, a personal computer (PC), to the CATV system line equipment A, and its management terminal. B controls the electronic control unit 21 in the line device A, for example, a microcomputer, etc., and the electronic control unit 21 operates (controls) the level setting circuit 24 of the line device A to automatically change the device characteristics of the line device A. I will adjust it. In addition, the management terminal B is used by connecting to the line equipment A in the field office or CATV operator, so that the workers who set the level can use it when laying the line equipment on-site or before installing the line equipment. You can also

An example of the line equipment A is shown in FIG. The line device A shown in FIG. 2 is, similarly to the line device A of FIG. 3, a downlink input / uplink output terminal (terminal for connecting a downlink input signal and an uplink output signal) 1 and a downlink output / uplink input terminal (downlink output). Downstream / upstream demultiplexing filter (filter for demultiplexing downstream signal and upstream signal) 2, downstream input level adjustment attenuator (downstream signal arrival level adjustment) between signal and upstream input signal externally terminal 14 Attenuator: electronic variable ATT etc. 3a, downstream input level adjustment equalizer (adjustment circuit for adjusting downstream signal arrival level: electronic variable equalizer, slope circuit, etc.) 3b, downstream first stage amplifier (downstream signal Amplifying circuit: IC, etc.) 4, TWlST GC (circuit that absorbs changes in attenuation due to changes in temperature such as coaxial cable) 5, downstream input level setting attenuator (downstream signal input level can be changed arbitrarily) Adjusting circuit: electronic variable ATT, etc. 6, branching device (circuit that branches the signal to the AGC circuit) 7, detection filter (circuit that extracts the AGC pilot signal from the branched signal: bandpass filter, etc.) 8, AGC detection (Circuit for detecting AGC pilot signal: IC or the like) 9, branching device (circuit for branching down status signal) 10, down output level setting attenuator (attenuator capable of arbitrarily changing down signal output level: Electronic variable ATT etc.) 11a, downstream final stage amplifier (circuit for amplifying downstream signals: IC etc.) 12, downstream / upstream demultiplexing filter (filter for demultiplexing downstream signal and upstream signal) 13, upstream input level setting Attenuator (attenuator capable of arbitrarily changing upstream signal input level: electronic variable ATT, etc.) 15, upstream first stage amplifier (circuit for amplifying upstream signal: IC, etc.) 16, mixer (upstream TAS signal mixing circuit) 17, upstream final stage amplifier (circuit for amplifying upstream signal: IC, etc.) 18, upstream output level adjusting attenuator (adjusting attenuator for adjusting the center arrival level of upstream signal: electronic variable type) ATT, etc.) 19a, an upstream output level adjustment equalizer (adjustment equalizer for adjusting the center arrival level of the upstream signal: an electronic variable equalizer, a slope circuit, etc.) 19b, and a status monitor (STM) 20 are provided.

  2 is provided with a downstream output level setting equalizer 11b, an electronic control unit (for example, a microcomputer) 21, and other setting circuits 22 in addition to the above components and circuits. Examples of the other setting circuit 22 include an inflow noise detection circuit, a gate control circuit that controls opening and closing of a gate that blocks or passes the inflow noise, and an upstream band switching circuit. The electronic control unit 21 is provided with a terminal connection terminal 23 to which the management terminal B can be connected (linked).

The management terminal B outputs the down / upward input level, output level, tilt amount, and the like to the electronic control unit 21 of the line equipment A, so that the level setting circuit 24 of the line equipment A (the down input level setting attenuator 6, downlink output level setting attenuator 11a, the input level of the downlink / uplink downlink output level setting equalizer 11b, the upstream input level setting attenuator 15), the output level, settings such as the tilt amount is automatically performed, the set value storage, are then to be rope also line management, and the like.

  In order to be able to designate the input / output level, output level, tilt amount, etc. for the downlink / uplink to the management terminal B, various data necessary for setting such as the standard setting values such as the gain, the tilt amount, etc. Is registered, and the level setting of the line device A can be performed without inputting the set value one by one by selecting the registered device setting or the like. Arbitrary level settings can also be registered.

  The line device A simultaneously sets the monitoring address of the status monitor center software, the state of the other setting circuit 22 of the line device A, etc., in addition to the setting of the input / output level, the output level, the tilt amount, etc. It is made to be able to.

1 Downlink input / uplink output terminal 2 Uplink / downlink demultiplexing filter 3a Downlink input level adjustment attenuator 3b Downlink input level adjustment equalizer 4 Downstream first stage amplifier 5 TWIST GC
6 Downstream input level setting attenuator 7 Branching device 8 Detection filter 9 AGC detector 10 Branching device 11, 11a Downstream output level setting attenuator 11b Downstream output level setting equalizer 12 Downstream final stage amplifier 13 Upstream / downstream demultiplexing filter 14 Downstream Output / upstream input terminal 15 Upstream input level setting attenuator 16 Upstream amplifier 17 Mixer 18 Upstream amplifier 19a Upstream output level adjustment attenuator 19b Upstream output level adjustment equalizer 20 Status monitor (STM)
21 Electronic control unit (microcomputer)
22 Other setting circuit 23 Terminal connection terminal 24 Level setting circuit A Line equipment B Management terminal

Claims (7)

In the method of adjusting the device characteristics of the line equipment and setting the level of both the upstream signal and downstream signal or one of the signals (input / output signal),
The line device includes a level setting circuit capable of setting device characteristics of the line device, an electronic control unit capable of setting the level by controlling the level setting circuit, and a terminal connection terminal capable of connecting a management terminal. , to the terminal connection terminal of the line equipment not laid in the transmission path of the CATV system to connect the management terminal unit that is provided separately from the CATV system, the management of the management terminal unit on the line device by sending a set value which is previously registered in the terminal device, the electronic control unit of the line equipment that has received the setting value based on the setting value, the said level setting circuit of the line equipment automatically adjusted Automatically set the input / output level of track equipment ,
A level setting method for track equipment for CATV systems. In the level setting method of the line equipment for the CATV system according to claim 1,
The terminal connection terminals of the line equipment that is not laid on the transmission path of the CATV system, by the management terminal unit that is connected to the line equipment at the time of characteristic adjustment, to another in line within the instrument and the level setting circuit in the line equipment provided by the state of other settings circuits set or / and save the configuration data sent to the address set and line equipment status monitoring, management also cormorants line,
A level setting method for track equipment for CATV systems. In CATV system line equipment,
The track equipment has a downstream input / upstream output terminal and a downstream output / upstream input terminal,
A terminal that can be attached / detached to / from a management terminal prepared separately from the CATV system , a level setting electronic control unit, a level setting circuit capable of adjusting device characteristics , other setting circuits, and a CATV system are connected between the terminals. With terminals,
The other setting circuit is at least one or more of a joint noise detection circuit, a gate control circuit that controls opening and closing of a gate that blocks or passes the joint noise, and an upstream band switching circuit .
The electronic control unit is controlled by a management terminal different from the CATV system connected to the terminal connection terminal of the line equipment not laid in the transmission line of the CATV system ,
The level setting circuit is automatically adjusted by controlling the electronic control unit with the management terminal, and the level setting of the input / output signal of the line equipment is automatically performed .
CATV system track equipment characterized by this. In the device that sets the level of the line equipment for CATV system,
A cable device for a CATV system according to claim 3, and a management terminal device detachable from a terminal connection terminal of the track device,
The management terminal is prepared separately from the CATV system, and at least the data required for setting the downlink / uplink input level and output level, and the setting of the device for level setting are registered. This adjustment, can be connected to the terminal connection terminal of the line equipment that is not laid on the transmission path of the CATV system, the electronic control unit of the connected line equipment, set level that is preset in the management terminal unit To control the electronic control unit of the line equipment,
When the electronic control unit is controlled based on a setting level transmitted from the management terminal, the level setting circuit of the line device is automatically adjusted to set the level of the input / output signal of the line device. Is done automatically ,
A level setting device for track equipment for CATV systems. In the level setting apparatus of the track equipment for the CATV system according to claim 4,
In addition to setting the input / output level, the management terminal sets the status of the setting circuit other than the level setting circuit in the line device or / and the address setting of the status monitor in the line device, and the setting sent to the line device Data can be stored and managed ,
A level setting device for track equipment for CATV systems. In the level setting device of the line equipment for the CATV system according to claim 4 or claim 5,
The management terminal is registered with various data necessary for setting these levels, including at least the standard settings for the downlink / uplink input levels and output levels, and can also register arbitrary level settings. By selecting the registered line equipment, you can set the level of the input / output signal of the line equipment without inputting the set value one by one .
A level setting device for track equipment for CATV systems. In the level setting apparatus of the line equipment for the CATV system according to any one of claims 4 to 6,
In addition to setting the input level and output level of the down / up, the line equipment can also set the status of the monitoring address of the status monitor center software and other setting circuits of the line equipment .
A level setting device for track equipment for CATV systems.

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