JPH0129876Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a demultiplexing device, and more specifically, the present invention is characterized in that the communication line is not disconnected when changing from a set backup type demultiplexer to a frequency backup type demultiplexer. This relates to a demultiplexing device.

In general, the set reserve method is a method for making maximum use of the allocated channel frequencies, and includes two transmitters and receivers with the same frequency, one of which is the active equipment and the other One of the devices is configured as a backup device, and a switch can be used to instantly switch between the current and backup devices.

On the other hand, in the frequency reserve method, one transmitter or receiver is connected to each assigned channel frequency, and one of the transmitters or receivers is assigned to the reserve channel.

The advantage of the set reserve method is that it can utilize all the allocated channels, but when the number of transmitted signals increases to two or more, the number of transmitters increases compared to the frequency reserve method, equipment costs are high, and the structure is is also complicated.

Therefore, when a new frequency is allocated due to an increase in line demand, the switch may be made to the economically advantageous frequency reserve method, but conventional demultiplexers use either the set reserve method or the frequency reserve method. or if it is necessary to change from the set reserve method to the frequency reserve method,
I had no choice but to disconnect the line and make the change. However, disconnecting the line in public communications is a serious problem and must be avoided as much as possible.

The present invention was developed in view of the above points, and therefore, the purpose of the present invention is to provide a new branching device that can be modified without disconnecting the line when changing from the set protection method to the frequency protection method. It is about providing.

In order to achieve the above object, the demultiplexing device according to the present invention includes a demultiplexing filter that can be used in a set backup type demultiplexer so that when changing to a frequency backup method in the future, the change can be made without momentary interruption of the line. A circulator with a metal reflector on one end is mounted in advance at the location where the circulator is to be installed.

Hereinafter, a preferred embodiment of the demultiplexing device according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of a conventional set-preparation type demultiplexer having two channel frequencies.

In FIG. 1, reference symbols TX ₁ , TX ₂ and
RX ₁ and RX ₂ are the active transmitter and receiver, respectively, and TX ₁ ′, TX ₂ ′ and RX ₁ ′, RX ₂ ′ are the backup transmitter and receiver, respectively.

In the event of a problem with the current machine, the system is switched from the current machine to the standby machine, increasing the reliability of the line. Incidentally, at this time, the active machine and the standby machine use the same frequency. Also, in FIG. 1, reference number 1
is a transmitting system circulator, 2 is a receiving system circulator, 3 is a transmitting branch filter, 4 is a receiving branch filter, 5 is a microwave switch, 7 is a transmitter/receiver duplexer, 8 is a coupler, 9 is a terminator (dummy load) ,
10 each indicates an antenna.

When changing the conventional set backup system shown in FIG. 1 to the frequency backup system shown in FIG. 2, the frequency of the backup system is changed while the active system is operating. That is, TX ₁ ′→TX ₂ , RX ₁ ′→
The frequencies are changed from RX ₂ , TX ₂ ′ to TX ₄ , and from RX ₂ ′ to RX ₄ , and then branching filters 3 and 4 are provided, and a circulator 1 is added to the transmission system of the branching device.
Also, circulator 2 will be added and connected to the receiving system, but at this time channels CH ₂ ,
CH ₄ 's line is disconnected.

Next, FIG. 3 shows the block configuration of the demultiplexer according to the present invention. In the figure, reference number 6 is a reflective metal plate, and the other elements are the same as those shown in FIGS. 1 and 2.

Including circulator 1, transmission branching filter 3, microwave switch, etc. (microwave switch 5, circulator 1 connected between filter 3 and switch 5, circulator 1 connected to this circulator 1, terminator 9) The circulator 2, reception branching filter 4, coupler 8, etc. are called a reception branching filter. Each transmitting duplexer and each receiving duplexer are connected in cascade.

In this way, if the circulator equipped with the reflective metal plate 6 is installed in advance in the demultiplexer, even if the reflector is removed when connecting the transmitting demultiplexing filter and the receiving demultiplexing filter, the circulator can be removed from the circulator. The amount of radiation and attenuation is about 15dB,
Since a normal communication line has a dynamic range of about 40 dB, it can be performed without disconnecting the line, and it is possible to easily change from the set protection method to the frequency protection method.

Next, the change procedure will be explained in detail.

(1) In FIG. 3, turn off the transmitter TX ₁ ' and remove section A from the transmitter TX ₁ ' and section A'.

(2) Attach the reflector 6' to the part removed in (1) above, as shown in Figure 4, at section A', and then attach the reflector of the transmission system circulator 1 corresponding to the transmitter TX ₁ '. 6, attach part E, and then turn transmitter TX ₁ ' to "ON".

(3) For the transmitter TX ₂ ', follow the same procedure as in (1) and (2) above.

(4) Next, turn off the receiver RX ₁ ' shown in FIG. 3 and remove the C section from the receivers RX ₁ ' and C'.

(5) As shown in Fig. 4, terminate section C' at the location removed in (4) above, remove reflector plate 6 of receiving system circulator 2 corresponding to receiver RX ₁ ', and attach section G. , then turn on the receiver RX ₁ '.

(6) Turn receiver RX ₂ ' “OFF” and perform steps (4) and (5) above.
Follow the same procedure.

(7) Next, turn off the transmitters TX ₁ and TX ₂ in Figure 4.
, remove the I and J sections, attach the M and N sections to the removed locations, and connect them to new transmitters TX ₃ and TX ₄ , as shown in Figure 5.
A new line can be configured by turning transmitters TX ₃ and TX ₄ "ON".

(8) Turn receiver RX ₁ and RX ₂ “OFF” and
And remove the L part and insert the O there as in (7) above.
and P part installed and new receiver RX ₃ and
By connecting to RX ₄ , new lines can be configured for the receiving system as well as the transmitting system.

As explained above, the above (1) to (8) according to the present invention
By making the change in accordance with the steps described above, it is possible to change from the set protection method to the frequency protection method without disconnecting the line, and it becomes possible to provide a highly reliable communication line.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of a conventional set-preparation type demultiplexing device, Fig. 2 is a circuit diagram of a conventional frequency-preparation type demultiplexing device, and Fig. 3 is a set-preparation type demultiplexing device showing an embodiment of the present invention. The circuit diagram of FIG. 4 and FIG. 5 are detailed illustrations of the modification process according to the present invention. 1... Transmission system circulator, 2... Receiving system circulator, 3... Transmission system branching filter, 4...
... Reception system branching filter, 5 ... Microwave switch, 6 ... Metal plate for reflection, 7 ... Transmission/reception duplexer, 8
...Coupler, 9...Terminator (dummy load), 1
0...Antenna.

Claims (1)

[Scope of utility model registration request] A plurality of transmitting duplexers, each consisting of a circulator, a transmitting duplexing filter, a microwave switch, etc., and a plurality of receiving duplexers, each consisting of a circulator, a receiving duplexing filter, a coupler, etc., are each connected in cascade. A set-preparation type demultiplexing device, characterized in that a circulator having a metal reflecting plate at one end is inserted between each of the transmitting demultiplexers and between each of the receiving demultiplexers.