JP3268146B2 - CATV repeater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a repeater capable of relaying an optical signal in a CATV system, and more particularly to a repeater capable of easily reversing a relationship between a front surface of a housing and signal input terminals and output terminals.

[0002]

2. Description of the Related Art Conventionally, a repeater for receiving an optical signal of a CATV system and outputting the signal as an electric signal has a cover on the front side, and a normal posture is to dispose the cover on a lower side. In this normal posture, the left side of the housing is for inputting an optical signal, and the right side terminal is for outputting a high-frequency signal. As described above, the relationship between the normal posture of the repeater and the input and output directions of the signal is uniquely determined, and the relationship cannot be changed.

[0003]

Therefore, when a repeater is laid, since the direction in which the downlink signal is transmitted is uniquely determined, the front end of the repeater naturally has its input terminal on the left end. , And the right end becomes the output terminal. As a result, depending on the direction of the front, a large work space could not be taken, and it was difficult to install and adjust the units inside the housing, resulting in poor workability. Further, if the front of the repeater is determined so as to facilitate the operation, it is necessary to connect the left optical cable to the right terminal and the right coaxial cable to the left terminal.

[0004] In addition, in a tree-like CATV system that has been laid once, it is sometimes necessary to permanently reverse the transmission direction of the trunk line in a certain section due to the repair of the facility. In this case, it is necessary to reverse the amplification direction of the relay amplifier in the corresponding section. In this case, it is necessary to reverse the front of the housing of the relay amplifier itself,
Requires extensive work. When a signal transmission system is bypassed, an optical signal may be directly transmitted from a transmitting terminal station via an optical cable to bypass the signal. At this time, it is very convenient if the electric signal repeater can be shared as the optical signal repeater.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to make it possible to easily reverse the relationship between the front face of a housing and signal input and output terminals. It is.

[0006]

Claims 1 and 4 are directed to a repeater with unidirectional, bidirectional, with branch, and without branch,
Of these, attention is directed to a unit relating to a downstream signal of a trunk line. Claims 2 and 3 relate to a bidirectional system, claims 5 and 6 relate to a system with a branch, and claim 7 relates to a bidirectional system. It also relates to a system with a branch. Claim 8 relates to a device having a monitor terminal for a trunk signal, and claim 9 relates to a device having a monitor terminal for a branch signal.

[0007] Claim 1 includes a first terminal and a second terminal for a high-frequency electrical signal is output by a coaxial cable, Re first holding member and the second holding member and the pixel-resolution for holding passes the optical cable a box-shaped housing formed in the end surface of the left right, and the mother board disposed at the bottom of the casing, a first power splitter that is disposed in the first terminal side on the motherboard in order to separate the power filter and a second power separation filters also disposed in the second terminal side, the conversion is possible for CATV repeater an optical signal and an electrical signal having a frequency equalizer, and outputting an electrical signal Pair of main cases for
Side connection terminal and optical end for connecting optical cable
And a child, are disposed with the optical / electrical converter for converting into an electric signal the optical signal transmitted a frequency equalizer that equalizes the converted electrical signals by the optical cable, input from the optical terminal
The input optical signal is converted to an electrical signal and connected to the main case.
Has a metal main case that outputs to one of the
The pair of main case side connection terminals are provided on the outer surface of the main case facing the motherboard at a rotationally symmetric position of 180 degrees with respect to the rotation center axis of the main case perpendicular to that surface.
And a pair of main case side connection terminals are engaged with the pair of main case side connection terminals at a 180-degree rotationally symmetric position with respect to the rotation center axis on the motherboard provided in the housing, and each of the first case and the first case is connected via the first power separation filter. Forming a pair of board-side connection terminals connected to the second terminal via the second power separation filter at the terminal;
The main case-side connection terminal and the board-side connection terminal can be engaged with each other in two postures, that is, a normal posture and a reversed posture in which the main case is rotated by 180 degrees with respect to the rotation center axis. Is characterized in that the optical cable supplied from the first holding member is connected to the optical terminal, and when the main case is in the inverted posture, the optical cable supplied from the second holding member is connected to the optical terminal.

The feature of the above configuration is that the optical / electrical converter and the frequency equalizer are housed in one main case, and the relationship between the main case side connection terminal and the board side connection terminal is described with the main case in the center. The arrangement is such that even when the terminal is rotated by 180 degrees with respect to the axis, the two terminals are engaged with each other so as to be rotationally symmetric with respect to the center axis by 180 degrees.

A second feature of the present invention is that the main case is bidirectional, and the main case has a pair of main case side connection terminals, the down signal of the down signal.
A demultiplexing filter for separating an upstream signal and a downstream signal connected to the main case side connection terminal existing on the output terminal side, and an electric / optical converter for converting an electric signal into an optical signal and supplying the optical signal to the optical terminal; , And a pair of optical terminals are provided for the downstream optical signal and the upstream optical signal.

[0010] The feature of claim 3 is that the main case is constituted by three cases. That is, a first sub-case containing a receiving optical terminal for receiving an optical signal and an optical / electrical converter, a second sub-case containing a transmitting optical terminal for transmitting an optical signal and an electrical / optical converter, It was composed of a main body case having a duplexer, a frequency equalizer, and a main case side connection terminal.

According to a fourth aspect of the present invention, an optical cable is connected from both right and left sides of the repeater, and at least one fiber present in the optical cable is relayed by the repeater and transmitted as an optical signal. Has become.

According to a fifth aspect of the present invention, after converting an optical signal into an electric signal, the electric signal can be branched. It has a metal branch case with a built-in branch amplifier that amplifies the branched signal, the housing has a branch terminal for outputting the branch signal to the outside, and on the outer surface facing the motherboard of the main case. A main case side branch connection terminal is provided at a rotation center axis position of the main case, a first board side branch connection terminal engaged with the main case side branch connection terminal is provided on the motherboard, and the branch case faces the motherboard. on the outer surface, the branch casing side branching terminal for inputting a branch signal from the main casing via the motherboard, the provided branching case side branch terminal for outputting a branch signal to an arbitrary position, the branch casing side branch connected to the motherboard A second board side branch connection terminal engaged with the terminal, a branch case side branch terminal,
That is, a board-side branch terminal connected to the branch terminal of the housing is provided.

A sixth feature of the present invention is that the system is capable of branching in one direction, and that the motherboard is shared for both directions. That is, when the input direction of the downstream signal is inverted, both the main case and the branch case can be inverted. For this purpose, with respect to the connection between the main case and the motherboard, a pair of first board-side branch connection terminals are formed on the motherboard at 180 ° rotationally symmetric positions with respect to the rotation center axis of the main case, A main case side branch connection terminal that outputs a downstream branch signal engageable with one of the pair of first board side branch connection terminals in the normal posture and the inverted posture of the main case on the outer surface facing the main case. did.

Further, with respect to the connection between the branch case and the motherboard, the motherboard is connected to the pair of second board-side branch connection terminals and the branch terminal at a position symmetrical by 180 degrees with respect to the rotation center axis of the branch case. A board-side branch terminal is formed, and on the outer surface facing the motherboard, the branch case has two positions: a normal position of the branch case and an inverted position rotated by 180 degrees with respect to its rotation center axis. can either engage with the second board-side branching connection terminal pair, and branching case side branching connection terminal for inputting a downlink branch signals from the main casing via the motherboard, the board-side
A branch case-side branch terminal that engages with the branch terminal and outputs a branch signal;
It can be used in two postures, that is, an inverted posture rotated by 80 degrees.

A seventh aspect of the present invention relates to a bidirectional branching system. It has a metal branch case with a built-in branch amplifier that amplifies the branched signal, the housing has a branch terminal that outputs a branch signal, and is provided on an outer surface of the main case facing the motherboard. A pair of case-side branch connection terminals, the pair of case-side branch connection terminals being formed at 180-degree rotationally symmetrical positions with respect to the rotation center axis of the main case, and the motherboard having a rotation center axis of the main case. On the other hand, a pair of first board-side branch connection terminals engageable with a pair of case-side branch connection terminals is formed at a 180-degree rotationally symmetric position regardless of the normal posture and the inverted posture of the main case. On the outer surface facing the motherboard, the case is 18
A pair of branch case-side branch connection terminals for inputting or outputting signals to and from the main case and a branch case-side branch terminal for inputting / outputting a branch signal are provided at a rotationally symmetric position of 0 degrees, and the rotation of the branch case is provided on the motherboard. Regardless of the two postures of the normal posture of the branch case and the inverted posture rotated by 180 degrees with respect to the rotation center axis, a pair of branch case side branch connection terminals are provided at a rotationally symmetric position of 180 degrees with respect to the central axis. A pair of second board-side branch connection terminals to be engaged, and a branch case-side branch terminal;
A board-side branch terminal that is engaged and connected to the branch terminal of the housing is provided, and the main case and the branch case can be used in two postures: a normal posture and a reversed posture rotated by 180 degrees. .

According to an eighth aspect of the present invention, a monitor connection terminal is provided on the main case and the motherboard for electrical connection between the main case and the motherboard irrespective of the normal posture and the inverted posture of the main case. According to a ninth aspect of the present invention, the branch signal monitor terminal is engageable with the branch case and the motherboard to electrically connect the branch case and the motherboard regardless of the normal posture and the inverted posture of the branch case. That is, a terminal is provided.

[0017]

According to the first aspect of the present invention, even when the main case is changed from the normal posture to the inverted posture, the main case side connection terminal and the board side connection terminal are connected to the center axis of the main case by 18 degrees.
Both terminals can be connected because they are arranged symmetrically about 0 degrees. Therefore, when the main case takes a normal posture,
The first terminal of the housing becomes free, the optical cable is held by the first holding member, the tip is connected to the optical terminal, and a down signal is supplied from the optical cable. In the main case, the optical signal is converted into an electric signal, and the electric signal is output from the second terminal. Conversely, when the main case is in the inverted position, the second terminal of the housing is free, the optical cable is held by the second holding portion, and the end of the cable is connected to the optical terminal,
In the main case, the optical signal is converted into an electrical signal, and the electrical signal is output as a downstream electrical signal at the first terminal of the housing. Thus, the transmission direction of the trunk signal can be changed only by reversing the posture of the main case without changing the front position of the housing.

According to the second aspect of the present invention, the transmission direction of the trunk signal can be changed without changing the front of the housing in the repeater which is capable of bidirectional transmission, one of which is an optical cable and the other is a coaxial cable.

In claim 3, the downstream signal system, the upstream signal system, and a system in which both are mixed are different cases. Therefore, by removing the upstream signal system for each case, a unidirectional system can be provided.

According to the fourth aspect of the present invention, in a system in which optical cables are provided on both the left and right sides of the housing, at least one fiber in the cable is relayed by a mechanical repeater. Therefore, it is possible to relay the optical signal, receive the optical signal, convert the optical signal into an electric signal, and send the electric signal to the trunk line and the branch line.

According to the fifth aspect, the posture of the branch case is not changed. The posture of only the main case (including the main case in which the first sub case, the second sub case, and the main body case are combined) is reversed. The main case-side branch connection terminal of the main case and the board-side branch connection terminal of the motherboard are arranged on the rotation center axis, so that even if the main case is inverted, signals can be branched to the branch case. .

According to the present invention, when the transmission direction of the signal is reversed, the postures of the main case and the branch case are both reversed. The pair of first board-side branch connection terminals and the pair of second board-side branch connection terminals of the motherboard are arranged at 180-degree rotationally symmetric positions with respect to the rotation center axes of the main case and the branch case. Terminal connection is possible for both the posture and the inverted posture.

According to the seventh aspect, when the transmission direction of the trunk signal is reversed, both the main case and the branch case are reversed. A pair of case-side branch connection terminals of the main case and one of the motherboard
Since the pair of board-side branch connection terminals are disposed at 180 ° rotationally symmetric positions with respect to the rotation center axis of the main case, the posture of the main case can be inverted. Similarly, the branch connection terminal between the branch case and the motherboard is similarly disposed at a rotationally symmetric position by 180 degrees with respect to the rotation center axis of the branch case, so that the posture of the branch case can be reversed. Therefore, it is possible to reverse only the transmission direction of the trunk signal without changing the front position of the housing.

Claims 8 and 9 relate to the monitor terminal, which enables signal monitoring even when the main case and the branch case are inverted.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to specific embodiments. This embodiment is a repeater capable of bidirectional transmission and branching. FIG. 1 is an assembly view showing a mechanical configuration of the repeater. Reference numeral 10 denotes a metal main case on which a circuit is mounted,
Main body case 11, first sub-case 12, second sub-case 13
Consisting of The main body case 11 has a rectangular parallelepiped shape, and cutouts 111 and 112 are partially formed on both sides. The first sub-case 12 is a case in which a circuit of the downstream main signal system is mounted and a convex portion 121 is formed below. The convex portion 121 is fitted into the cutout portion 112 of the main body case 11. The second sub-case 13 is a case in which a circuit of an upstream main signal system is mounted and a convex portion 131 is formed below.
The protrusion 131 is fitted into the notch 111 of the first embodiment. The optical connector L1 is provided in the first sub-case 12, and the second sub-case 1 is provided with the optical connector L1.
3 is provided with an optical connector L2.

Reference numeral 30 denotes a metal branch case on which a circuit of a branch signal system is mounted. Reference numerals 41, 42 and 43 denote motherboards, and reference numeral 50 denotes a housing. A first terminal 52 and branch terminals 53 and 54 are provided on a left side surface 51 of the housing 50, and a second terminal 56 and two branch terminals 57 shown in FIG. 58 are provided.

FIG. 2 shows a circuit diagram of the repeater. The main body case 11 is provided with a demultiplexer 113, a frequency equalizer 114 as a downstream main signal system, a branching device 115 for monitoring a downstream input main signal, and a frequency equalizer 116 as an upstream main signal system. Are arranged. The first sub-case 12 includes an optical / electrical converter 122 that converts an optical signal into an electric signal, and a branching device 1 that branches a downstream trunk signal into a branch system.
The second sub-case 13 includes a mixer 132 for mixing the upstream signal of the branch system into the main system upstream, branch devices 133 and 134 for monitoring the upstream signal, and an upstream optical signal for upstream light. An electrical / optical signal converter 135 for converting the signal into a signal is provided.

The branch case 30 includes amplifiers 301, 302, and 303 for amplifying the downstream branch signal and four branch trunk signals.
Distributors 304, 307, and 308 for distribution, branchers 309 and 310 for monitoring a downstream branch signal, and a demultiplexing filter 30 for separating a downstream branch signal and an upstream branch signal
5, 306 and a mixer 311 for mixing the upstream branch signal.

The motherboard 41 is provided with a first power separation filter 411 and other power separation filters 412 and 413 for branch lines, and the motherboard 42 is provided with a second power separation filter 421 and others for branch lines. Power separation filters 422 and 423 are provided. Then, the motherboards 41, 42, and 43 are disposed insulated at the bottom of the housing 50 as shown in FIG.

In this relay, the side face 5 of the housing 50
The first holding member 61 and the second holding member 6
2 are provided. The optical cables 71 and 72 are held by the housing 50 by the first holding member 61 and the second holding member. The optical cables 71 and 72 are respectively composed of four fibers 71a, 71b, 71c, 71d, 72a, 72
b, 72c and 72d. The fiber 71a is connected to the optical terminal L1 formed on the first sub case 12, and the fiber 71b is connected to the optical terminal L2 formed on the second sub case 13. The optical terminal L1 is connected to the optical / electrical converter 122, and the optical terminal L2 is
It is connected to the optical converter 135.

On the other hand, the fibers 72a and 72b are not connected to any terminal and are in an open state.
The fibers 71c and 71d are connected to the fibers 72c and 72d by welding, respectively. These fibers 71c and 72c are downstream optical signals,
d and 72d respectively transmit upstream optical signals, and the repeater merely mechanically relays the fiber.

Next, a description will be given of an arrangement of terminals for connecting each case and the motherboard, which is a feature of the present invention. As shown in FIG. 3, main case side connection terminals A1 and A2 are arranged at 180 ° rotationally symmetric positions with respect to the rotation center axis O on the surface of the main body case 11 facing the motherboards 41, 42 and 43. Have been. In order to extract a monitor signal, the main case side monitor connection terminals D1, D2, E1, E
2 are respectively disposed, and terminals D1 and D2 are connected to the central axis O.
The terminals E1 and E2 are disposed point-symmetrically with respect to the central axis O.

On the other hand, in the motherboards 41 and 42, FIG.
As shown in FIG. 2, board-side connection terminals A1 'and A2' that engage with the main case-side connection terminals A1 and A2 are arranged point-symmetrically with respect to the central axis O. Similarly, the board side monitor connection terminals D1 ', D2', E1 ', E2' are engaged with the main case side monitor connection terminals D1, D2, E1, E2.
The terminals D1 ′ and D2 ′ are disposed point-symmetrically with respect to the central axis O, and the terminals E1 ′ and E2 ′ are disposed point-symmetrically with respect to the central axis O.

The motherboard 43 of the second sub-case 13
The main case side branch connection terminal B1 is disposed on the left and right center lines on the surface facing the main body 11 and is connected to the second sub case 13 and the main body case 11 with respect to the downstream main signal. Connection terminals C1 and C2 are provided. Further, a connection terminal F1 is provided for extracting a monitor signal from the second sub-case 13 to the motherboards 42 and 41 via the main body case 11. For these connections, the connection surfaces of the main body case 11 and the second sub-case 13 are provided on the connection terminals C1 'and C1' which engage with the connection terminals C1, C2 and F1.
2 ′ and F1 ′ are formed.

As for the branch system, the first sub-case 12
Is formed with a main case side branch connection terminal B2,
First sub-case 12, main body case 11, and second sub-case 13
Are combined, the main case side branch connection terminals B2 and B1 are disposed at 180-degree rotationally symmetric positions with respect to the rotation center axis O. On the other hand, on the motherboard 43 , the board-side branch connection terminals B1 ′ and B2 ′ engaged with the terminals B1 and B2 are 18
It is arranged at a rotationally symmetric position of 0 degrees.

Further, the branch case 30 includes the branch case 3
0 central axis W to 180 degrees rotationally symmetrical positions to the branch casing side branching connection terminal G1 of, G2 is disposed, the mother <br/> board 43, with respect to the central axis W of the branch casing 30 1
Board-side branch connection terminals G1 ', G
2 'is provided. In the motherboard 43, the terminal B1 'and the terminal G1' are connected, and the terminal B2 'and the terminal G2' are connected.

The branch case 30 has branch case side branch terminals H1 and H2 for inputting and outputting branch signals, which are point-symmetric with respect to the center axis W, and are connected to the branch case side branch terminals J1 and J2.
2 are provided point-symmetrically with respect to the central axis W, and branch case side branch monitor terminals K1 and K2 for outputting a branch monitor signal are provided point-symmetrically with respect to the central axis W. Further, on the motherboards 41 and 42, board-side branch terminals H1 ', H2', J1 ', J2' and board-side branch monitor terminals K1 ', which engage with the terminals H1, H2, J1, J2, K1, K2, respectively. And K2 'are arranged point-symmetrically with respect to the central axis W.

In the above configuration, the main body case 11, the first sub-case 12, and the second sub-case 1 are connected as shown in FIG.
3 (the main case 10) and the branch case 30
Is the normal posture. In this state, the first terminal 52 of the housing 50 is opened, and the fiber 71 of the optical cable 71 held by the first holding member 61 is opened.
a and 71b are connected to the optical terminals L1 and L2 by optical connectors, respectively, the second terminal 56 is an output terminal for a down electric signal, and the fibers 72a and 72b of the optical cable 72 held by the second holding member 62 are It is open.

When the first terminal 52 of the housing 50 is to be an output terminal for a downstream signal and the optical cable 72 is to be an input side of a downstream signal, the posture of the housing 50 is maintained and the optical cable 7
The first fiber 71a, 71b is removed from the optical terminals L1, L2, the combined main case 10 is rotated by 180 degrees, the branch case 30 is also rotated by 180 degrees, and attached to the motherboards 41, 42, 43. 72a and 72b are connected to the optical terminals L1 and L2, respectively. At this time, the terminals A1, A2,
E1, E2, D1, and D2 are the motherboard 4
1, 42 side terminals A2 ', A1', E2 ', E1', D
2 ′ and D1 ′, respectively.

The terminals B1 and B2 are connected to the motherboard 43.
Are connected to the terminals B2 'and B1', respectively. further,
Regarding the branch case 30, the terminals H1, H2, J1, J
2, K1 and K2 are terminals H on the motherboard side, respectively.
2 ', H1', J2 ', J1', K2 ', K1'. Thus, the main case 10 and the branch case 3
Even if it is inverted to 0, the symmetry of the circuit is not broken, so that an optical signal of a downstream signal is input from the optical cable 72, a downstream electric signal is output from the first terminal 52, and the branch electric signal is output from each branch terminal. In addition to the output, the upstream electric signal input from each branch terminal is converted into an optical signal, mixed with the main line upstream signal, and transmitted from the second terminal 56. In addition, it is possible to monitor upstream and downstream trunk signals and branch signals. However, the monitor terminal of the main line signal is the up input monitor terminal and the down input monitor terminal is the down output monitor terminal in the normal posture and the inverted posture.

The extra fibers inside the housing are housed in a wound state in a fiber housing case (not shown).
The welded portion with c and 72d is in this fiber storage case.

[Brief description of the drawings]

FIG. 1 is an assembling diagram showing an assembling of a configuration of a device according to a specific embodiment of the present invention.

FIG. 2 is a circuit diagram showing a circuit configuration of the embodiment device.

FIG. 3 is an explanatory diagram showing the arrangement of terminals of each case and a motherboard.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Main case 12 ... 1st sub case 13 ... 2nd sub case 30 ... Branch case 41, 42, 43 ... Motherboard 50 ... Case 52 ... 1st terminal 56 ... 2nd terminal 61 ... 1st holding member 62 ... 1st 2 Holding members 71, 72 ... Optical cables A1, A2 ... Main case side connection terminal A1 ', A2' ... Board side connection terminal B1, B2 ... Case side branch connection terminal B1 ', B2' ... First board side branch connection terminal G1 , G2 ... branch case side branch connection terminal G1 ', G2' ... second board side branch connection terminal J1, J2, H1, H2 ... branch case side branch terminal J1 ', J2', H1 ', H2' ... board side branch Terminal L1, L2: Optical terminal

────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Tatsuya Ohashi 1 at Shimogiri Himegaoka, Kani City, Gifu Prefecture Aichi Electronics Co., Ltd. Kani factory (56) References Real opening 1-86380 (JP, U) Real opening Sho 64-29973 (JP, U) JP-A-1-81084 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04N 7/10 H04N 7/14-7/173 H04N 7 / 20-7/22 H04N 5/00

Claims (9)

(57) [Claims] By 1. A coaxial cable and a first terminal and a second terminal for a high-frequency electrical signal is output, Re first holding member and the second holding member and the pixels for holding passes the optical cable <br/> Re a housing box type formed on the end face of the left and right, and a motherboard disposed in the bottom of the housing, to separate the power
A first power separation filter is disposed in the first terminal side of the motherboard, and a second power separation filters also disposed in the second terminal side, an optical signal and an electric signal having a frequency equalizer in the conversion is possible for CATV relay, the main case side connecting terminals of the pair for inputting and outputting electrical signals
And an optical terminal for connecting the optical cable.
A, is the said frequency equalizer arranged to equalize the optical / electrical converter for converting into an electric signal the optical signal transmitted, the converted electrical signal by the optical cable, the optical terminal
Converts the optical signal input from the
Metal main case designed to output to one of the connection terminals
The pair of main case side connection terminals are arranged on an outer surface of the main case facing the motherboard at a rotationally symmetric position of 180 degrees with respect to a rotation center axis of the main case perpendicular to the surface. A pair of main case side connection terminals at positions 180 ° rotationally symmetric with respect to the rotation center axis on the motherboard provided on the housing, and respectively engaged with the first power separation. Forming a pair of board-side connection terminals connected to the second terminal via the second power separation filter at the first terminal via a filter, and positioning the main case with respect to a normal posture and the rotation center axis; 18
The main case-side connection terminal and the board-side connection terminal can be engaged with each other in two postures, that is, an inverted posture rotated by 0 degrees, and supplied from the first holding member when the main case is in a normal posture. Connected optical cable to the optical terminal,
A CATV repeater, wherein the optical cable supplied from the second holding member is connected to the optical terminal when the main case is in the inverted posture. 2. The CATV repeater is bi-directional, and further includes a main case side connection terminal on the output side of the down signal among the pair of main case side connection terminals. A demultiplexing filter for separating an upstream signal and a downstream signal to be connected; and an electrical / optical converter for converting an electrical signal into an optical signal and supplying the optical signal to the optical terminal, wherein the optical terminal is used for a downstream optical signal. The CATV repeater according to claim 1, wherein one pair is provided for the upstream optical signal. 3. The main case includes a first sub-case including a receiving optical terminal for receiving an optical signal and the optical / electrical converter, a transmitting optical terminal for transmitting an optical signal, and the electric / optical converter. 3. A CATV according to claim 2, comprising: a second sub-case having a built-in component; and a main case having the duplexer, the frequency equalizer, and the main-case-side connection terminal.
Repeater. 4. An optical cable is held by each of the first holding member and the second holding member, and at least one fiber is relayed and transmitted as an optical signal. 2. The repeater for CATV according to 1. 5. The CATV repeater is a repeater capable of branching a signal, and has a metal branch case having a built-in branch amplifier for amplifying a branched signal. A branch terminal for outputting to the outside, and a main case side branch connection terminal is provided at the rotation center axis position of the main case on an outer surface of the main case facing the mother board; A first board-side branch connection terminal that engages with the main case-side branch connection terminal; a branch signal is input from the main case via the motherboard to the branch case on an outer surface facing the motherboard; A branch case side branch terminal, a branch case side branch terminal for outputting a branch signal, a second terminal engaged with the branch case side branch connection terminal on the motherboard; The CATV repeater according to claim 1, further comprising a board-side branch terminal connected to the board-side branch connection terminal, the branch case-side branch terminal, and connected to the branch terminal of the housing. 6. The CATV repeater is an amplifier capable of branching a signal, having a metal branch case having a built-in branch amplifier for amplifying a branched signal, wherein the housing outputs a branch signal. A pair of first board-side branch connection terminals are formed on the motherboard at 180-degree rotationally symmetric positions with respect to the rotation center axis of the main case; On the facing outer surface, the main case-side branch connection terminal that outputs a downstream branch signal that can be engaged with one of the pair of first board-side branch connection terminals in the normal posture and the inverted posture of the main case. A board connected to the pair of second board-side branch connection terminals and the branch terminal of the housing at a 180-degree rotationally symmetric position with respect to the rotation center axis of the branch case on the motherboard; A branch terminal is formed, on the outer surface of the branch case facing the motherboard, in two postures: a normal posture of the branch case and an inverted posture rotated by 180 degrees with respect to a rotation center axis thereof; A branch case-side branch connection terminal that is engageable with one of the pair of second board-side branch connection terminals and that is used to input a downstream branch signal from the main case via the motherboard; A branch case-side branch terminal for outputting a combined branch signal, wherein the main case and the branch case can be used in two postures: a normal posture and an inverted posture rotated by 180 degrees. 2. The repeater for CATV according to 1. 7. The CATV repeater is a repeater capable of branching a signal, and has a metal branch case having a built-in branch amplifier for amplifying a branched signal, and the casing is configured to transmit the branch signal. And a case-side branch connection terminal provided on an outer surface of the main case facing the motherboard, wherein the pair of case-side branch connection terminals includes a rotating terminal of the main case. The main case is formed at a position 180 degrees rotationally symmetric with respect to the rotation center axis of the main case, regardless of the normal posture and the inverted posture of the main case. Forming a pair of first board-side branch connection terminals engageable with the pair of case-side branch connection terminals, and the branch case has an outer surface facing the motherboard; 18 with respect to the central axis of rotation of the serial branch casing
A pair of branch case side branch connection terminals for inputting or outputting a signal to or from the main case at a 0-degree rotationally symmetric position, and a branch case side branch terminal for inputting / outputting a branch signal are provided. The pair of branches are located in a 180-degree rotationally symmetric position with respect to the rotation center axis of the case, regardless of two postures: a normal posture of the branch case and an inverted posture rotated by 180 degrees with respect to the rotation center axis. A pair of second board-side branch connection terminals engaged with the case-side branch connection terminals, and a board-side branch terminal connected to the branch case-side branch terminal and connected to the branch terminal of the housing; The CATV repeater according to claim 2, wherein the main case and the branch case can be used in two postures: a normal posture and an inverted posture rotated by 180 degrees. 8. A pair of a first terminal side and a second terminal side for monitoring a potential at a predetermined point in the main case are provided on an outer surface of the main case facing the motherboard. A pair of main case-side monitor connection terminals are disposed at a 180-degree rotationally symmetric position with respect to the central axis of the main case, and a pair of the motherboard-side monitor connection terminals are disposed at a 180-degree rotational symmetric position with respect to the central axis. 8. The monitor connection terminal according to claim 1, further comprising a board-side monitor connection terminal that is engaged with the main-case-side monitor connection terminal regardless of the normal posture and the inverted posture of the main case. The repeater for CATV as described. 9. A pair of branch case side branch monitor connection terminals for monitoring a potential at a predetermined point in the branch case are provided on an outer surface of the branch case facing the motherboard. A pair of the motherboards are disposed at a position 180 degrees rotationally symmetric with respect to the central axis, and a pair of the monitor connection terminals on the branch case side and the normal posture of the branch case are arranged on the motherboard. 8. The C according to claim 5, further comprising a board-side branch monitor connection terminal that is engaged regardless of the inverted posture of the board.
ATV repeater.