JPS6057797A - Representative group block system by night transfer device - Google Patents

Abstract

PURPOSE:To attain a representative line block at night with simple constitution by connecting a representative line block circuit to a night transfer device and using a subscriber source switching contact in the circuit as a contact for a circuit transfer device. CONSTITUTION:When the reception job of an attendant board at daytime is finished and the job is transferred to the night job, an NT switch equipped with the attendant board ATT is operated and a trunk line transfer relay T is restored. Then (t) and (tx) contacts are restored. Since a part shown in dotted lines in Fig. is connected in advance in the night transfer device inserted to the trunk line having the oldest number in this case, a ground potential E is given to the trunk line of the oldest number. This is received by the line circuit of a station and the corresponding representative trunk line is blocked through a succeeding discriminating processing. Thus, the representative line blocking is performed without requiring any special mounting space.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a method for blocking a representative line at night in a general private branch exchange that changes daytime and nighttime private branch exchange operations.

[Background of the invention]

In conventional private branch exchanges, as shown in Figure 1, the night switching function and the representative station line blockage function were handled using independent methods. ) The representative office line blocking circuit is usually prepared by the customer or at the construction stage separately from the exchange, and an appropriate mounting location cannot be found. (3) Since the night switching device is usually equipped with multiple circuits, there are inconveniences such as an excess of circuits compared to the switching requesting station line and the circuit being disabled.

[Purpose of the invention]

The object of the present invention is to eliminate these disadvantages, effectively utilize an unused nighttime switching device, and simultaneously block the representative station line by a series of nighttime switching signals without separately preparing a representative station line blocking circuit. Our goal is to provide you with the services you need.

[Summary of the invention]

The representative office line blocking circuit, which consists of one resistor and a circuit switch, is incorporated into the night switching device, and the circuit switch contact is removed by using the subscriber line switching contact in the night switching device, resulting in night switching. Add one resistor to the switching device and create a blockage signal sending station! li! (The oldest numbered station line in the representative station line group) was made to send out the earth air that passed through the resistance.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to Figures 1 and 2. Figure 1 is a diagram of a representative station line group blocking system in the conventional system, where 1 is a central office line trunk, 2 is a night switching device, 3 is an exchange, and 4 is a representative station line group blocking signal sending circuit. In the conventional system, the representative station line group is blocked by sending earth air through the resistance by the representative station line blockage signal sending circuit shown by the dotted line 4 on the oldest numbered station line. Because direct dial telephones are not connected, night switching equipment is usually not installed. Further, the night switching device is generally configured with a plurality of circuits mounted per package or unit. For this reason, the number of representative office line groups or the number of direct telephones connected thereto does not match, and when the equipment is delivered, more circuits than the required number of circuits are delivered.

The present invention implements only one circuit of circuit 4 shown in Fig. 1 in this nighttime switching device, inserts the nighttime switching device (the above-mentioned extra circuit) into the oldest station line, and performs nighttime switching by engineering. At the same time, the system is characterized in that a group of sending out representative station lines is blocked on the A line side of the station lines.

Hereinafter, one embodiment of the present invention will be described with reference to FIG. ,1
Figure-2 shows the circuit of a general night switching device. A.T.
T is the relay board that handles incoming calls connected to the central office line, T is the central office line switching relay that receives the night switching signal from the relay board, and the difference is the reading point of the relay.

X is a T-relay contact provided according to the present invention for sending a representative station line group blockage signal, C is a capacitor for direct current cut, A is a monitoring relay that monitors the usage status of the telephone, and B supplies driving current to the T-relay. Negative battery, E is earth. When the daytime relay desk reception service ends and shifts to nighttime service, the nighttime switching signal is transferred to this nighttime switching device by operating the NT switch installed on the ATT control panel, etc.
T is restored after the drive current is cut off. When T is restored, each χ and ix contact is restored. At this time, the night switching device inserted into the oldest station line had the dotted line part in the diagram connected in advance due to the construction worker's wiring, so the ground air E was
3 Knee A (Fl -f -!-AIm route) is sent to the oldest numbered station line. This is received by the station side line circuit, and after the subsequent determination process, the corresponding representative group station line is blocked.

On the other hand, when transitioning from nighttime to daytime work,
By restoring based on the NT switch with ATT,
T of the night switching device operates and disconnects the local air E that was being sent to the oldest station line, thereby releasing the blockage of the relevant representative group station line on the station side.

〔Effect of the invention〕

According to the present invention, there is no need to install a representative station line group blocking circuit, so no special mounting space is required. Also, when transitioning to nighttime switching operations, it is sufficient to perform the same connection as other nighttime switching devices without having to route the same signal.

Furthermore, even if the power to the private branch exchange goes out, the night switching device can switch the corresponding office line to the same state as night service, so even if the representative office line group is blocked at the central office,
If you connect a talkie device for guidance service to the central office line that is switched to a direct line in advance, you can respond appropriately to calls from customers when the private branch exchange is out of operation without going silent. It is possible to reply, which leads to improved customer service.

[Brief explanation of drawings]

Figure 1 is a system diagram showing an example of sending a representative station line group blockage signal in a conventional system, and Figure 2 is a circuit diagram showing an embodiment of a night switching device incorporating the present invention. 1... Office line trunk, 2... Night switching device, 6.
...Switchboard, 4...Representative station line group blockage signal sending circuit, A
TT...relay stand, T...station line switching relay, χ,
7tJc...T relay contact, A...monitoring relay,
C...Condenser, B...Negative battery, E...Earth air. Notification I diagram

Claims (1)

[Claims] For general private branch exchanges that end daytime relay stand operations and change to nighttime direct dial telephone or night reception desk operations,
A night switching device equipped with a night switching signal receiving circuit, a communication status monitoring circuit for switched subscriber lines and central office lines, and a representative group blocking circuit for sending earth air to the central office line A line allows switching from daytime to night and from night to night. A representative group blocking method using a nighttime switching device characterized in that when taking over private branch exchange operations during the daytime, a switching signal is received from a repeater, etc., and the representative group blocking signal is sent to or released from the station side.