KR20160061038A - A transmitting and receiving system for community facility of satellite television by applying an integrated optical receiver and splitter equipment which has optical splitter - Google Patents

Abstract

Disclosed is a satellite broadcast common facility transmission system using an optical reception distribution device having an integrated built-in optical splitter. To this end, the present invention provides a satellite broadcasting common facility transmission system comprising: a head-end part receiving a terrestrial television broadcast or a satellite broadcast program to transmit the same through an optical cable; an intermediate amplifier box connected to the head-end part through an optical cable, and including an optical splitter, and an optical reception distribution device having an integrated built-in optical splitter in which an optical receiver and a distributor are integrated; a house terminal box connected to the intermediate amplifier box through a coaxial cable and installed in respective houses; and a receiving device connected to the house terminal box through a coaxial cable and used by a user. Thus, in the satellite broadcast common facility transmission system, installation and maintenance are simplified, cost is saved, and a signal deviation occurring between buildings or users can be minimized.

Description

TECHNICAL FIELD [0001] The present invention relates to a system and method for transmitting a satellite broadcasting common facility using an integrated optical receiving /

[0001] The present invention relates to a system for transmitting a satellite broadcast common facility in a large building linked with a hybrid fiber coaxial (HFC) network, and more particularly, And a common facility transmission system.

In recent years, communication and broadcasting network infrastructures have been divided into several types. Broadcasting is divided into terrestrial, cable television (CATV: Community Antenna Television) and satellite broadcasting networks, and communication is divided into various types of communication networks including wired and wireless. For such a diversified network structure, various approaches are being considered to meet the demands of consumers expecting a merging service that integrates broadcasting and communication on a current network in which multimedia services are mainstream.

That is, various attempts have been made to provide services using a single transmission line and a receiver by integrating a method of providing broadcast and communication services to subscribers using separate transmission channels and receivers. In addition, as a future subscriber access network for overcoming the disadvantages of the current subscriber access network and providing more bandwidth and various services to subscribers, a passive optical network (PON) having a multipoint structure, A fiber to the curb (FTTC) type network structure in which only a fiber to the home (FTTH) type or a curb type optical communication type is widely used.

As a part of the FTTH or FTTC network, a PON structure using an optical medium has been suggested a structure suitable for combining communications and broadcasting to provide subscribers with data, broadcasting and telephone services at low cost. This PON structure uses a wavelength division method using separate wavelengths for uplink and downlink data transmission, and it is an easy method to transmit additional wavelengths to a subscriber for transmission of broadcasting service. The method of providing a broadcasting service to a subscriber by adding a separate wavelength is the same as a hybrid fiber coax (HFC) scheme in terms of structure, so that a set top box (STB) can be used, have.

Currently, multi-channel broadcasting is receiving service through terrestrial broadcasting, television reception through various media such as cable broadcasting (CATV) or satellite broadcasting through satellite. However, since there are broadcasting services using various media, it is necessary for a subscriber to have a broadcasting equipment system suitable for each broadcasting service in order to use various broadcasting services. In other words, in order to receive the CATV broadcasting service, a wired cable network and a set-top box (STB) system are required. To use the satellite broadcasting service, a separate satellite antenna and a satellite set-top box (STB) : Video On Demand) service, it is necessary to construct a separate equipment from the IPDSLAM system and modem at the subscriber side. Such a reality does not integrate broadcasting, so a subscriber in a home increases the cost of constructing a broadcasting facility due to the use of various services, and consequently increases burden on service provision.

In order to solve such a problem and to integrate broadcasting and communication, the Internet and broadcasting service are provided through a television receiver. In addition, various types of broadcasting services using different media are provided in a broadcasting service. Various technologies that can provide services using a communication network have been proposed.

On the other hand, among the HTTC networks, a hybrid fiber coaxial (HFC) network refers to a network from a broadcasting company to a fiber node to an optical fiber, and the remaining lines from a light distribution point to a subscriber are coaxial cables.

The simplest form of HFC is to utilize fiber optic cable from a broadcasting station to a distribution point that serves 500-2000 households. A coaxial cable is then provided from one light distribution point to the home and is connected to a set-top box, cable modem, etc., depending on the service.

To this end, a signal passing through an optical core of an optical cable is conventionally received through an optical receiver. The optical receiver converts an optical signal into an RF signal. Thereafter, the RF signal is transmitted to the distributor through the coaxial cable, and is connected to each household through the RF terminal of the distributor.

However, conventionally, the optical receiver and the distributor are disposed in separate places. Therefore, it is not easy to maintain and maintain the optical receiver and the distributor separately. In addition, eight RF terminals are usually disposed in the distributor. However, as the number of terminals capable of viewing an image at home increases, the RF terminal may be insufficient.

An object of the technical idea of the present invention is to apply an optical branching integrated optical receiving and distributing device in which an optical branching function, a light receiving function and an RF signal distributing function are integrated into a single device into the network, And to provide a satellite broadcast common facility transmission system that utilizes an integrated optical receiving and distributing device with an optical branch capable of reducing the amount of water and reducing the attenuation amount and return loss of the received signal.

A system for transmitting a satellite broadcasting common facility utilizing an optical branching integrated optical receiving and distributing apparatus according to an aspect of the technical idea of the present invention includes a head end and a receiving unit for receiving a terrestrial television broadcast or a satellite broadcast program and transmitting an optical signal to an optical cable A plurality of intermediate amplifiers including a head-end part and an optical branching integrated optical receiving and distributing unit connected to the optical cable in the head-end unit and having an optical splitter, an optical receiver, and a distributor integrally formed therein. A household terminal box connected to the intermediate amplifier by a coaxial cable and installed in each household, and a receiver connected to the household terminal box by a coaxial cable and used by a user.

According to an embodiment of the present invention, the optical branching integrated optical splitting and distribution apparatus of the intermediate amplifier includes an optical splitter for branching an optical signal input from the head end unit and transmitting optical signals to a plurality of optical cables, A photoelectric conversion unit for receiving an optical signal from the optical branching unit and converting the optical signal into an RF signal; a plurality of first RF signals having the same signal loss by receiving the RF signal through the photoelectric conversion unit, And a plurality of first RF output terminals for outputting a first RF signal distributed through the distribution circuit section and a second RF output terminal for outputting a second RF signal branched through the distribution circuit section, And an RF extension terminal for outputting a signal.

According to an embodiment of the present invention, the optical splitter of the optical branching integrated optical splitter may include a T-type coupler for demultiplexing one input optical signal into two output optical signals, ), And it is preferable that the T-type coupler transfer one output optical signal to an internal photoelectric conversion unit and the other output optical signal to another intermediate amplifier.

At this time, the light branching device of the optical branching integrated type optical receiving and distributing device may further include an attenuator capable of compensating for an attenuation loss therein, and the attenuator in the branching unit of the plurality of intermediate amplifier boxes may include: Different ones are suitable.

According to an embodiment of the present invention, the photoelectric conversion unit of the optical branching integrated type optical receiving and distributing device includes a photoelectric conversion unit connected to the optical cable and converting an optical signal into an electrical signal, The RF modulating unit of the photoelectric converting unit may include first to fourth amplifying units capable of amplifying the electric signal of the photoelectric converting unit into four stages, And an attenuator for adjusting an electrical signal passing through one of the amplifying parts.

Meanwhile, the optical branching integrated optical receiving and distributing apparatus of the intermediate amplifier according to an embodiment of the present invention includes an optical level comparing unit for determining whether an optical signal level inputted to the photoelectric converting unit is proper, And a notification unit that notifies whether the optical signal is appropriate.

According to another embodiment of the present invention, the optical splitter integrated optical splitter of the intermediate amplifier may be an optical splitter extension module, and the optical splitter extension module may include an optical splitter integrated optical splitter having the above- An input terminal connected to the other end of the coaxial cable, a coaxial cable having one end connected to an RF extension terminal of the optical branching built-in optical receiver and a coaxial cable, and an input terminal connected to the other end of the coaxial cable, And a divider including a plurality of second RF output terminals connected to the distribution circuit.

According to the technical idea of the present invention, first, since the optical cable is used from the head end to the intermediate amplifier in the transmission system of the satellite broadcast public facility, the amount of the wiring and the coaxial cable is reduced to reduce the cost, The signal deviation generated in the inter-building design can be reduced.

Second, since the optical branching device, the optical receiver, and the RF distribution device are integrally fabricated, it is possible to shorten the construction period in the installation of the satellite broadcasting common facility transmission system, It is possible to reduce the installation cost, reduce the maintenance and repair cost, and can easily perform after-sales service (A / S) operation.

Third, by providing an additional RF terminal that is separately connected to the conventional distributor, it is possible to apply it to a place where many RF terminals are required.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram for explaining a transmission system of a satellite broadcast common equipment according to a preferred embodiment of the present invention; FIG.
FIG. 2 is a conceptual diagram of an optical branching integrated optical receiving and distributing apparatus according to a preferred embodiment of the present invention.
3 is a block diagram of an optical branching integrated optical splitting and distributing apparatus according to an embodiment of the present invention.
4 is a perspective view of an optical splitter integrated optical splitter integrated with an optical branch according to an embodiment of the present invention.
FIG. 5 is a block diagram for explaining an optical receiving and distributing expansion module in an optical branching integrated optical receiving and distributing apparatus according to an embodiment of the present invention.

In order to fully understand the structure and effects of the present invention, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described below, but may be embodied in various forms and various modifications may be made. It should be understood, however, that the description of the embodiments is provided to enable the disclosure of the invention to be complete, and will fully convey the scope of the invention to those skilled in the art. In the accompanying drawings, the constituent elements are shown enlarged for the sake of convenience of explanation, and the proportions of the constituent elements may be exaggerated or reduced.

The singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. For example, the words "comprise" or "having" are used herein to designate the presence of stated features, integers, steps, operations, elements, parts or combinations thereof, wherein one or more other features, , Steps, operations, components, parts or combinations thereof, may be added.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are not to be construed as ideal or overly formal in meaning unless expressly defined in the present application .

Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram for explaining a transmission system of a satellite broadcast common equipment according to a preferred embodiment of the present invention; FIG.

Referring to FIG. 1, a transmission system 1000 of a satellite broadcasting common equipment according to the present invention includes a head-end unit 200 connected to an optical cable and an intermediate amplifier box 300. The head-end unit 200 is a component of the satellite broadcasting and cable broadcasting system, and receives a terrestrial television broadcasting program, a satellite broadcasting program, a program produced by a cable TV broadcasting company itself, or a program supplied from a program provider (PP) Point to the equipment by cable. In this case, the cable may be a coaxial cable or an optical cable, but in the present invention, it is preferable to use an optical cable. The intermediate amplifier 300 is a part corresponding to a transmission line for transmitting a signal transmitted from the head-end unit 200 to the terminal terminal box 400. The size of the transmission system 1000 of the satellite broadcasting common equipment, , And the configuration may vary according to the distribution density. However, according to the present invention, as shown in FIG. 2 to FIG. 3, at least the optical splitter 300, the optical splitter, the optical receiver, and the RF splitter are integrated into the intermediate amplifier 300, . This will be described in detail with reference to FIG. 2 to FIG.

At this time, it is preferable that a plurality of intermediate amplifiers including the optical branching built-in integrated optical receiver 300 are provided. Accordingly, when the system for transmitting satellite broadcast public facilities according to the preferred embodiment of the present invention is installed in a building such as an apartment or a building, the intermediate amplifier box 300 branches into " T " and may be installed on the floor. This design approach has the advantage of being built in recent high rise buildings.

In addition, the transmission system 1000 of the satellite broadcasting common equipment according to the present invention includes a generation terminal box 400 connected to the intermediate amplifier box 300 through a coaxial cable, and a reception device installed in the user 500 or the like. The generation terminal box 400 refers to a distribution box installed in a user's private space for efficiently distributing and connecting wirings such as a communication line to be introduced into a household or a public reception facility for broadcasting reception. The receiving device of the user 500 may be a television for receiving broadcasts, a computer for receiving the Internet, or a general telephone for communication.

FIG. 2 is a conceptual diagram of an optical branching integrated optical receiving and distributing apparatus according to a preferred embodiment of the present invention.

2, an optical branching integrated optical signal distribution device 300 used as an intermediate amplifier according to a preferred embodiment of the present invention includes an optical splitter 90, an optical receiver 20, and an RF signal splitter (40) are fabricated in one body. By designing the optical branching device 90 in front of the optical branching and distributing device 300, it is possible to shorten the construction period, reduce the signal deviation occurring in the inter-building design, It is possible to reduce the cost due to the elimination of the amplifier and reduce the maintenance cost.

The plurality of intermediate amplifier boxes 300 may be installed in different layers in the skyscraper buildings. At this time, each of the intermediate amplifier boxes 300 can vertically connect the input optical signal 12 to the T-type coupler 92 of the optical splitter 90 through the optical cable 14 branched in the vertical direction . The optical branching device 90 is suitably connected to a separate optical attenuator 94 for adjusting the signal deviation.

Meanwhile, the other optical cables 14 branched from the T-type coupler 92 of the optical branching device 90 are horizontally connected and transmitted to an optical receiver, for example, the photoelectric conversion unit 20, so that the optical signals are converted into electrical signals . To this end, the optical receiver 20 may include an optoelectronic device 30 such as an LED and an amplification unit 36 capable of four-stage amplification. The electrical signal passed through the optical receiver 20 is transmitted to a receiver side of the user through a plurality of RF output terminals 50 and 60 through an RF signal distributor 60 having an RF signal distributor built therein through a coaxial cable Loses.

3 is a block diagram of an optical branching integrated optical splitting and distributing apparatus according to an embodiment of the present invention.

Referring to FIG. 3, an optical branching integrated optical signal receiving and distributing apparatus 300 applied to an intermediate amplifier in a photocoupler (HFC) according to a preferred embodiment of the present invention includes an optical branching unit 90, A photoelectric converter 20, and a signal distributor 40. The photo-

The optical branching unit 90 includes a T-type coupler 92 for branching and splitting one input optical signal 12 into two output optical signals. At this time, one optical signal 14 branched in the vertical direction can be used as an input of another intermediate amplifier box 300, and an optical signal branched in the horizontal direction is transmitted to the optical receiver 20. In this embodiment, the input signal and the output signal are three ports. However, the number of ports of the input signal output signal may be varied from 3 to 32. Such an apparatus for diverging light can be realized by a method of drawing two fibers close to each other, applying heat to each other, stretching them thinly, or by using a lithography technique on a silicon substrate.

The optical signal passing through the T-type coupler 92 of the optical branching device 90 is preferably transmitted to the optical receiver 20 through the optical attenuator 94. This is because it is necessary to adjust the light attenuation loss of about -1 dBm whenever the intermediate amplifier box 300 is used one by one. For example, if six intermediate amplifier boxes are used, the optical attenuator rating of 1 dBm can be used as the optical attenuator in the light amplifier of each intermediate amplifier box, thereby reducing the signal deviation that may occur between the layers of the building.

The light receiving unit, that is, the photoelectric conversion unit 20 is connected to an optical cable to convert the optical signal into an electrical signal, for example, an RF signal. In this case, the optical signal may have a wavelength of 1550 nm suitable for broadcasting, for example. The photoelectric conversion unit 20 may include a photoelectric conversion unit 30 and an RF modulation unit 35. The photoelectric element section 30 includes a photodiode to convert the optical signal into an electrical signal. The present invention may further include a photoelectric element section 30 and a power supply section 90 for providing power to the RF modulator section 35. [ The power supply unit 90 may be installed outside the optical branching integrated optical signal receiving and distributing apparatus 300.

The RF modulator 35 modulates an electrical signal through the optoelectronic device 30 into an RF signal. An RF signal refers to a high frequency signal used for wireless communication or the like. Video refers to a signal such as an antenna-to-TV signal for a composite signal or an RGB signal, that is, a radio signal modulated with a composite signal and an audio signal.

In this case, the RF modulator 35 is configured to have four amplifiers 36 and attenuators 36 so that the RF modulator 35 can perform gain adjustment and inclination adjustment through four stages of amplification and compatibility with satellite signals for sky life, , 37). The attenuator (37) adjusts an electric signal passing through the amplifying part (36). The attenuation rate is kept constant in the frequency band while accurately maintaining the desired attenuation amount while holding the oscillation through the attenuator or reducing the reflection loss. The attenuator can change the amount of attenuation by means of a level controller 34 (see Fig. 4) such as a dial, and can directly read the attenuation ratio. Therefore, the attenuation ratio and gain can be measured and the voltage and current of the signal can be adjusted.

The RF signal distributor, for example, the distribution circuit section 40 receives the RF signal through the optical receiver, that is, the photoelectric conversion section 20, and distributes a plurality of first RF signals having the same signal loss, And a second RF signal having a different signal loss.

The distribution circuit unit 40 transmits signals having different signal losses. In this case, the first RF signal having the same signal loss is distributed and transmitted to a plurality of first RF output terminals described later. In addition, the second RF signal different from the first RF signal is transmitted to the RF extension terminal 60 located separately from the first RF output terminals. That is, the plurality of first RF output terminals 50 output the first RF signal distributed through the distribution circuit unit 40, and the RF extension terminal 60 outputs the first RF signal distributed through the distribution circuit unit 40 2 Output the FR signal.

Each of the first RF output terminals 50 is connected to a terminal of a broadcasting subscriber. Accordingly, each of the first RF output terminals 50 functions as an output terminal of the distributor.

Unlike the first RF output terminal 50, the RF extension terminal 60 may be connected to a separate splitter. If the number of terminals of the broadcasting subscriber is 10, and the first RF output terminal of the optical branching integrated type optical receiving and distributing apparatus 300 is 8, an output terminal is further needed. In this case, when the RF output terminal is connected to the distributor having two or more RF output terminals through the RF extension terminal 60, the RF output terminal can be expanded to match the number of terminals of the subscriber. An unillustrated reference numeral 95 denotes a circuit protection element that protects the circuit from static electricity.

Meanwhile, the present invention may further include a light level comparison unit 70 and a notification unit 75. The light level comparator 70 determines whether the optical signal level input to the photoelectric converter 20 is appropriate. Whether the RF signal is appropriate or not depends on whether the optical signal level is appropriate or not. Therefore, if the optical signal level is not appropriate, it is necessary to correct it. The notification unit 75 functions to notify whether the optical signal is appropriate or not according to the judgment of the suitability of the optical level comparator 70. The notification unit 75 may be a LED light source, for example, to turn on green light when it is normal, to change the light color at normal time and abnormal time so as to light red light when it is abnormal, So that they can be distinguished from each other. The notification unit 75 may be informed as a separate sound.

4 is a perspective view of an optical splitter integrated optical splitter integrated with an optical branch according to an embodiment of the present invention.

Referring to FIG. 4, the optical branching integrated optical receiving and distributing device may further include a housing 11. (90 in FIG. 3), a photoelectric conversion unit 20 as an optical receiver, and a distribution circuit unit 40 are accommodated in the housing 11. In this case, one side of the housing 11 is provided with an optical connector 12 connected to the optical cable, another optical connector 14 branched from the T-type coupler of the optical branching device and connected to another intermediate amplifier box, 90 are connected to the power source connector 13. An LED notification unit 75, first RF output terminals 50, a level adjuster 34 and an RF extension terminal 60 are disposed on the upper surface of the housing 11. Reference numeral 96 denotes an opening / closing part provided so as to replace the optical attenuator having a different rated capacity in the optical branching device.

5 is a conceptual diagram of an optical receiver distribution expansion module according to another embodiment of the present invention.

Referring to FIG. 5, the optical receiving and distribution expansion module 100 capable of serving as the optical branching integrated optical receiving and distributing apparatus shown in FIG. 2 includes the above-described optical receiving and distributing apparatus 300, 110, and a coaxial cable 120. One end of the coaxial cable 120 is connected to the RF extension terminal 60 of the integrated optical splitter 300. The other end of the coaxial cable is connected to the input terminal 112 of the other distributor 110. The distributor includes an input terminal 112 and an RF signal distribution circuit 114 for distributing a plurality of RF signals received through the input terminal and a plurality of second RF output terminals 116 connected to the distribution circuit do.

It will be apparent to those skilled in the art that the present invention is not limited to the above-described embodiment and that many modifications are possible within the technical scope of the present invention.

20: optical receiver (photoelectric conversion section) 90: optical branching device
92: T-type coupler 94: Optical attenuator
30: Photoelectric element section 35: RF modulation section
36: Amplification unit 37: Attenuator
40: RF signal distribution section
50: first RF output terminal 60: RF extension terminal
40: light level comparator 75:
100: optical receiver distribution expansion module 110: other distributor
200: head and tail part 300: intermediate amplifier
400: household terminal box 500: user
1000: Broadcasting system of satellite broadcasting common facilities.

Claims (11)

A head-end part for receiving a terrestrial television broadcast or a satellite broadcast program and transmitting an optical signal to an optical cable;
A plurality of intermediate amplifiers connected to the head and the optical cable and including an optical splitter, an optical receiver, and a distributor integrally formed therein;
A household terminal box connected to the intermediate amplifier box by a coaxial cable and installed in each household; And
And a receiver connected to the household terminal box by a coaxial cable and used by a user. The method according to claim 1,
The optical branching integrated optical receiving and distributing device of the intermediate amplifier box comprises:
An optical splitter for splitting an optical signal input from the head end unit and transmitting optical signals to a plurality of optical cables;
A photoelectric conversion unit for receiving an optical signal from the optical branching unit and converting the optical signal into an RF signal;
A distribution circuit for receiving a RF signal through the photoelectric conversion unit to divide a plurality of first RF signals having the same signal loss and for branching a second RF signal having a signal loss different from that of the first RF signal;
A plurality of first RF output terminals for outputting a first RF signal distributed through the distribution circuit section; And
And an RF extension terminal for outputting a second FR signal that is branched through the distribution circuit unit. The method according to claim 1,
The light branching device of the optical branching integrated type optical receiving and distributing device comprises:
And a T-type coupler for demultiplexing a single input optical signal into two output optical signals. The present invention relates to a system for transmitting a satellite broadcasting common facility utilizing an optical branching integrated optical receiving and distributing apparatus. The method of claim 3,
The T-
Wherein one output optical signal is transmitted to an internal photoelectric conversion unit and the other output optical signal is transmitted to another intermediate amplifier unit. 5. The method of claim 4,
The light branching device of the optical branching integrated type optical receiving and distributing device comprises:
And an attenuator capable of compensating for an attenuation loss inside the optical transmission line. 6. The method of claim 5,
Wherein the attenuator in the branching unit of the plurality of intermediate amplifier boxes comprises:
And each of the attenuators has a different capacity from each other. 3. The method of claim 2,
The photoelectric conversion unit of the optical branching built-
A photoelectric element connected to the optical cable for converting the optical signal into an electrical signal; And
And an RF modulator for modulating an electrical signal through the photoelectric element to an RF signal. 8. The method of claim 7,
Wherein the RF modulator of the photoelectric conversion unit comprises:
First to fourth amplifiers capable of amplifying an electrical signal of the photoelectric conversion unit into four stages; And
And an attenuator for adjusting an electrical signal passing through one of the first to fourth amplifying units. 3. The method of claim 2,
The optical branching integrated optical receiving and distributing device of the intermediate amplifier box comprises:
A light level comparator for determining whether an optical signal level input to the photoelectric conversion unit is appropriate; And
Further comprising an announcement unit informing whether the optical signal is appropriate or not according to an appropriate determination of the light level comparison unit. 3. The method of claim 2,
Wherein the optical splitter integrated optical splitter of the intermediate amplifier is an optical splitter and expansion module. 11. The method of claim 10,
The optical receiver distribution expansion module includes:
An optical branching integrated optical receiving and distributing device having a structure according to any one of claims 2 to 10;
A coaxial cable having one end connected to the RF extension terminal of the optical branching built-in optical receiver and distributor; And
And a distributor including an input terminal connected to the other end of the coaxial cable, a distributing circuit distributing a plurality of RF signals received through the input terminal, and a plurality of second RF output terminals connected to the distributing circuit Satellite Broadcast Common Facilities Transmission System Utilizing Integrated Optical Receiver Distribution System.

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