JPS5846894B2 - Itseiyobidashihoushiki - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a simultaneous paging system in a mobile switching system, particularly in a marine automatic switching system.

In an exchange for mobile devices, when a call is received at a certain mobile device, the trunk to which the mobile device is connected is unknown, so all mobile devices or mobile devices in each zone are called simultaneously. There is a need.

FIG. 1 is a connection system diagram showing an example of a simultaneous paging system in a conventional marine automatic switching system.

In the figure, NW is a network, BWT is a bidirectional trunk, SDT is a signal distribution trunk, O8T is an outgoing sender trunk, TR is a standby switching device, RFP-T is a test relay ring, and AMP is a level compensation amplifier. be.

In FIG. 1, a plurality of bidirectional trunks BWTs are installed in each zone, and a plurality of bidirectional trunks BWTs installed in the same zone are duplex connected to one circuit of signal distribution trunks SDT.

The signal distribution trunk SDT uses the contact S of the switching relay S to send either the idle signal PL or the paging signal sent from the outgoing sender trunk O8T through one path of the network NW to the bidirectional trunk EWT. Send.

The output sender trunk O8T is a 7-wave ship PB signal 5H.
It has a function of selecting one wave from the PB to create a mobile number, a paging signal using path 1 of the network NW, and a function of calling the mobile number using path 2.

In addition, the output impedance of the outgoing sender trunk O8T is 6008 because it is directly connected to the trunk line through path 2.
is set to

The backup switching device TR has a function of switching to the backup signal distribution trunk SDT when a failure occurs in the signal distribution trunk SDT, and the test trunk ring RE PT tests the signal distribution trunk SDT. It is for.

Normally, the blank line signal PL is AMP-8DT-TR-BW.
If the bidirectional trunk BWT is in use, the S IJ relay will operate and the contact S will open, so the AB and DE lines will be opened and the idle signal PL will be Not sent.

Now, when a mobile device receives a call, it is necessary to call the mobile device from the ship's automatic switching system.

The mobile device side is connected to one line to which the idle line signal PL is sent, but it is unclear to which line it is connected on the exchange side.

Therefore, when calling a mobile device, it is necessary to send the mobile device number to all available lines.

The mobile device number sent at this time is called a paging signal.

Output sender trunk O with output impedance 600J7
8T is reconnected by the network NW to a number of signal distribution trunks SDT, the number of bidirectional trunks BWT connected to each of the trunks SDT varying from 1 to 18 depending on the call volume.

Therefore, in order to make the sending level of the paging signal constant at the exit of the exchange, an amplifier AMP is required in the signal distribution trunk SDT to compensate for the constant level.

One amplifier AMP is required for each signal distribution trunk SDT, ie one for each zone.

Although the above description has been made using one zone and one signal distribution trunk, in reality, in places where a large number of mobile terminals are concentrated, such as at a port, the call volume is insufficient for one zone and one signal distribution trunk.

The number of bidirectional trunks BWT that can be connected to one signal distribution trunk SDT is approximately 18 due to the traffic volume.

Therefore, by configuring groups of mobile devices by frequency division,
For each group, it is necessary to associate one signal distribution trunk with one group of bidirectional trunks BWT.

On the other hand, in zones with low call volume, distribution into groups increases the number of signal distribution trunks SDT too much and becomes uneconomical, so for example, a common signal distribution trunk SDT is provided for every four groups. There must be.

In this way, the number of signal distribution trunks SDT is determined by the number of zones and the number of groups, and is very large.

Next, when a failure occurs in the signal distribution trunk SDT, the bidirectional trunk B belonging to the signal distribution trunk SDT
All WTs are unable to make or receive calls.

In places such as ships where there are no other means of communication, the damage caused by the suspension of incoming and outgoing calls is serious.

Providing a device composed of a large number of parts, such as an amplifier AMP, in the signal distribution trunk SDT reduces reliability and causes a situation in which calls cannot be made or received.

Therefore, a backup switching device is required to prevent reliability from decreasing.

As described above, the conventional system has drawbacks such as the use of a large number of amplifiers AMP, which are required only for a short time such as simultaneous paging, and the need for a backup switching device for this purpose.

The present invention aims to eliminate the above-mentioned drawbacks, and its purpose is to eliminate the need for a standby switching device and reduce the number of level compensation amplifiers for simultaneous paging by increasing the reliability of the signal distribution trunk. It is an object of the present invention to provide a simultaneous paging system that is economical by making the system more economical, simplifies exchange control for simultaneous paging, and further reduces failure tests.

The above object, according to the present invention, includes a bidirectional trunk installed for each line, a signal distribution trunk that distributes signals to each of the bidirectional trunks, and a signal distribution trunk that distributes signals to the plurality of bidirectional trunks via the signal distribution trunk. In an automatic switching system that accommodates in a network an outgoing sender trunk that simultaneously sends out paging signals, this is achieved by providing the outgoing sender trunk with an amplifier for compensating the sending level of the above-mentioned paging signal. .

The present invention will be described below with reference to the drawings.

FIG. 2 is a connection system diagram of a simultaneous paging system showing an embodiment of the present invention.

That is, the feature of FIG. 2 is that the signal distribution trunk SDT is configured with one S IJ relay contact, and the S IJ relay is operated by a signal from the relay drive device, which is a control device of the exchange, and the contact S is switched. , an amplifier AMP is inserted on the output side of the outgoing sender trunk O8T at the same time as forming path 1 of the network NW.

The outgoing sender trunk O8T is used to send out the mobile number on path 2 of the network NW when the S relay is inactive, and has the same function as in FIG. 1.

When S relay is activated, path 1 of network NW
An amplifier AMP is inserted into the outgoing sender trunk O8T.
The output impedance of a large number of bidirectional trunks (1 to
The output level on the trunk line side is set to be so small that the output level on the trunk line side hardly changes even if a cable (approximately 18 cm) is connected.

As for the control method for each device, in the case of simultaneous paging, it is sufficient to simply operate the S IJ relay, and since there is no standby switching device TR, control for standby switching or fault testing is not necessary.

The outgoing sender trunk O8T and the signal distribution trunk SDT, which are the main parts of the present invention, will be explained in detail.

FIG. 3 is a connection diagram of an outgoing sender trunk showing another embodiment of the present invention.

That is, in FIG. 3, separate outgoing sender trunks A-O8T and B-O8T are used in the case of simultaneous paging and in the case of sending the mobile number directly to the trunk line.

The method shown in FIG. 3 is the most general idea, but if there are two types of outgoing sender trunks O8T, division loss will occur, so the number of outgoing sender trunks O8T will increase.

On the other hand, as shown in Figure 2, one type of output sender trunk O
If the 8T is used instead of the SIJ tray, there will be no division loss as described above, and the number of outgoing sender/trunk O8Ts will not increase.

According to the invention, the signal distribution trunk SDT
Having only one tray contact improves reliability and eliminates the need for a standby switching device.

This allows, for example, 10 signal distribution trunks SDT
If one outgoing sender trunk O8T is provided for each, the number of amplifiers AMP is reduced by 1/10 and no spare signal distribution trunk SDT is required, which is very economical.

Furthermore, since there is no need for control for backup switching or fault testing, the number of control means can be reduced.

FIG. 4 is an explanatory diagram of a method of mounting and connecting a bidirectional trunk and a signal distribution trunk, showing one embodiment of the present invention.

That is, the present invention greatly simplifies the circuitry of the signal distribution trunk SDT, making it possible to incorporate the bidirectional trunk BWT and the signal distribution trunk SDT into the same unit, as shown in FIG.

Incorporating them into the same unit is extremely effective, especially when performing high-density packaging.

Additionally, a signal distribution trunk SDT and a bidirectional trunk B
Connection of WTs can also be performed only within the unit if the ratio between the number of BWTs and the number of SDTs is small.

Furthermore, even if the ratio between the number of BWTs and the number of SDTs is large, connections can be made outside the unit, and the number of terminals outside the unit is 1/n of the number of signal distribution trunks SDTs.

Here, n is the number of signal distribution trunk SDT circuits implemented in the unit.

FIG. 4 shows an example of n=4.

In FIG. 1 and FIG. 2, the explanation of the connection method of the signal distribution trunk SDT and the bidirectional trunk BWT is omitted, but if the connection ratio of the signal distribution trunk SDT and the bidirectional trunk BWT is unknown, All terminals of the BWT must be connected outside the unit.

In each of the embodiments, only the case of a ship's automatic switchboard has been described, but it goes without saying that the present invention can be applied to other automatic switchboards as well.

As explained above, according to the present invention, by providing an amplifier for level compensation in the outgoing sender trunk, the number of amplifiers can be reduced, the backup switching device of the signal distribution trunk can be eliminated, and the Since control can be simplified, the number of failure tests can be reduced, and high-density packaging can be facilitated, there are economic and efficiency advantages, and the effects are extremely large.

[Brief explanation of drawings]

Fig. 1 is a connection system diagram showing an example of a simultaneous paging system in a conventional marine automatic switching system, Fig. 2 is a connection system diagram of a simultaneous paging system showing an embodiment of the present invention, and Fig. 3 is a connection system diagram showing an example of a simultaneous paging system in a conventional marine automatic switching system. FIG. 4 is an explanatory diagram of a method of mounting and connecting a bidirectional trunk and a signal distribution trunk according to an embodiment of the present invention. In the figure, NW is a network, BWT is a bidirectional trunk, SDT is a signal distribution trunk, O8T is an outgoing sender trunk, TR is a standby switching device, REP-T is a test relay ring, and AMP is a level compensation amplifier. be.

Claims (1)

[Claims] A bidirectional trunk installed for each line, and a signal distribution trunk that distributes signals to each of the bidirectional trunks,
In an automatic switching system accommodating in a network an outgoing sender trunk that simultaneously sends paging signals to the plurality of bidirectional trunks via the signal distribution trunk,
A simultaneous paging system characterized by installing an amplifier in the outgoing sender trunk to compensate for the sending level of the paging signal.