JPS584518B2 - Desetzokuseigiyohoushiki - Google Patents

Description

[Detailed Description of the Invention] This invention is a common control type switching system in which a register and a sender are installed separately, and while the register receives a signal pulse from a caller, the sender part can sequentially send pulses to the other party. , and also relates to a connection control method to save the deterioration of the link block rate (internal congestion rate) that occurs when a method is adopted in which selective numerical information is stored separately in both the register and the sender in order to make the pulse storage circuit more economical. be.

Just like the exchanges that use the above method,
Exchanges that adopt the register sender merging format also had a large problem with the link block rate.

Therefore, a known connection control method for a register-sender merging type exchange that solves this problem will be described, as well as an embodiment of the present invention.

FIG. 1 is a relay system diagram of an exchange that employs a register sender merging system, and a known control system will be explained with reference to the diagram.

In the figure, SUB is a subscriber as an incoming line, SWF is a primary switch PSW, a secondary switch SSV, a tertiary switch TSW, and a primary link connecting each switch. Link A, secondary link B
The switch frame ORS consists of an outgoing register, an OS
L is the outgoing sender link, OGT is the outgoing trunk, ORMC
is a register marker connector, M is a marker, and FC is a frame connector.

Now each primary switch PSW and each secondary switch SSW+0
~+#7 are connected by one primary link, forming a so-called single link configuration. Therefore, it is assumed that one primary switch accommodates eight links. It is assumed that the register transmitter ORS is connected to the register sender ORS through a channel T (hereinafter referred to as register sender train) indicated by a thick solid line.

When the calling subscriber SUB dials for an outgoing connection, the register sender ORS receives this, and when it receives the numbers necessary for route identification, it activates the marker M via the register marker RMC.

The activated marker M is the vacant trunk O of the corresponding route.
After selecting and acquiring the GT, an operation is performed to select an empty channel connecting the calling party SUB and the outgoing trunk OGT, that is, channel matching is performed to connect the calling party SUB and the outgoing trunk OGT via the frame connector FC.

If this first channel matching fails, the marker M captures another empty trunk and performs channel matching again.

This operation is called recycling and is employed to reduce the link block rate in the tone connection or outgoing connection.

The number of recycles is usually several, and if channel matching is still not successful after several recycles, the call becomes a lost call.

Since the register sender ORS is receiving the dialed digits sent from the subscriber during the several channel matching described above, the register sender train T1 is in use, and therefore the channel between the subscriber SUB and the outgoing trunk OGT is At the time of matching, matching must be done with one less channel, that is, in the example shown in the figure, with 8 channels wide and 7 channels, so the probability of a link block increases.

The following control method is used to solve this drawback.

If channel matching is still not successful after several recycles, marker M does not set up a communication path on the selected channel (indicated by a dashed line channel in the figure), and instead connects the outgoing trunk OGT that was selected and captured at that time. A path from the output sender link OSL to the register sender ORS is established, and information necessary for sending out pulses is transferred to the ORS, and recovery is performed by instructing it to restart upon reception of the final number.

After that, the register sender ORS completes receiving all the dialed numbers of the subscriber and registers it as a register? When the function is completed, the register sender train T is restored, and the marker M is started again, and the connection between the subscriber SUE and the above-mentioned outgoing trunk OGT is established through the channel ch including the primary link A1 and other empty channels. be.

Further, after the restart, until the outgoing trunk OGT is connected to the subscriber, pulses are sequentially sent to the other station via the ORS-OSL-OGT route.

This makes it possible to maintain the link block rate in the register sender merging format to the same level as in the register sender separated format.

However, even in the register-sender separation format, if the register does not receive dial pulses from the caller, the sender sends the pulses sequentially to the other station, and the receiving pulse storage circuit is divided into two parts: the register and the sender. As in the register-sender merging method, the sender must sequentially transmit pulses to the other station while receiving pulses, so the train between the subscriber and the OR is used until all number pulses are accumulated.

Therefore, the link block rate when connecting the subscriber and the outgoing trunk increases.

Here, in the register sender separation format in which the register and output sender are connected to function as a register sender, when the marker is activated for the first time, the register and output sender are connected, and as in the register sender merging format, If you connect the outgoing sender and outgoing trunk and perform channel matching for that outgoing trunk when the marker is restarted, you will need a method such as remembering the position of the outgoing trunk until the marker is restarted. .

Further, the control at the time of initial marker activation and the control at the time of marker restart must be performed using different methods, resulting in a drawback that control becomes troublesome.

An object of the present invention is to provide an outgoing connection control system that can solve the problem of link block rate deterioration when register sender separation is performed as described above, and that can be implemented without particularly changing the control of markers and the like.

Therefore, in the present invention, in the case of the register sender separation format, the activated marker selectively captures an empty outgoing trunk, and also performs control to selectively capture an empty outgoing sender in the group corresponding to that trunk. Focusing on this, we decided to connect only between the free output sender and register of the group corresponding to the free output trunk, and not to capture and activate the trunk, if channel matching could not be achieved when the marker was activated.

Then, when the channel can be matched when the marker is restarted, etc., the free outgoing trunk and the free outgoing sender of the corresponding group are selected and captured, and they are connected, and the data received and accumulated at the outgoing sender connected to the register is captured. By transferring numerical information to the outgoing sender connected to the outgoing trunk, it was possible to send pulses to the other station.

In this way, by making the outgoing sender that is selectively captured when the marker moves for the first time different from the outgoing sender that is selectively captured when the marker is restarted, the deterioration of the link block rate can be easily solved without changing the control in particular. be able to.

The present invention will be explained in detail below with reference to FIG.

In Figure 2, LLF is a line link frame that accommodates a primary switch and a secondary switch, TLF is a trunk link frame that accommodates a tertiary switch, RSC is a register sender connector that connects the outgoing register OR and the sender OS, and OSC indicates a sender connector.

Even if the marker M receives the numbers necessary for REIT identification from the OR and selects the vacant trunk OGT, if channel matching is not possible, it performs a recycling operation to try to acquire another vacant trunk again.

The recycling operation is repeated several times, and if channel matching is still not possible, the captured free trunk OGT and the subscriber S. The communication path between UB is not set, and the marker M
Send air to senderlink OSL and senderlink O
Start SL.

The activated Senderlink OSL will be connected to the selected destination.
Control is not performed to connect the link OGT and the sender, and the vacant sender OS1 is selectively captured using the control signal from the marker M.

When the outgoing sender OS1 is captured, the information necessary for outgoing connection is sent to O.
Close the output sender connector OSC to send to S.

The marker M confirms the closure of the OSC and connects the output sender OS and the register OR via the register sender connector RSC.

After that, the marker M sends an instruction to the outgoing sender OS to restart the marker after receiving the information necessary for pulse transmission and the last digit (LDC).
Transfer A) and restore.

At this time, the operation of making a connection between the outgoing sender OS1 and the register OR is to connect the register and the sender to an accumulation circuit for accumulating the calling subscriber's dial pulse (the total number of digits of the called party number used in the outgoing connection). This is required because it is 2 minutes long.

After that, when the register and sender complete receiving all the subscriber's dialed digits, they restore the register sender train T, activate the marker M via the OS, -RS C-OR, and transfer the information accumulated in the register OR to the marker M. Transfer to.

Based on this information, the marker M selectively captures the vacant outgoing trunk OGT and performs matching selection of a channel that can connect the outgoing trunk 9GT and the adder STJB.

At this time, since the previous register sender train T has already been restored, the channels related to this train T can also be targeted for matching, so that the link block rate can be reduced.

In parallel with this operation, the marker M is set to the output sender link OSL.
, select a free sender OS, and connect it to the captured outgoing trunk OGT.

Marker M is further added to this newly selected output sender OS2.
Then, the information stored in the previous outgoing sender OS1 is transferred.

As described above, the subscriber SUB is connected to the outgoing trunk OGT, and the state is the same as when all the digits have been dialed. From now on, the connection is proceeded by a known method.

The above explanation deals with the case of channel mismatch, but when using bidirectional trunks for outgoing connections, the same applies when the selected trunk is captured by another incoming call during the connection and there are no free trunks left. It can be controlled by method.

From the above explanation, an exchange adopting this method can reduce link blocks in the same way as in the case of the register sender merging method.

[Brief explanation of drawings]

FIG. 1 is a relay system diagram showing an example of a register-sender merging type common control type exchange, and FIG. 2 is a relay system diagram of a register-sender separation type exchange to which the system according to the present invention is applied. OR...Register, OS, OS2...
・Output sender, OGT... Output trunk, RSC・
...Register sender connector, OSL...
・Senderlink, M...Marker.

Claims (1)

[Claims] 1 It has a register that receives and stores selected numeric messages sent from the subscriber's premises equipment, and a sender that has a function of accumulating the signals received by the register and a function of transmitting the selected digits, and combines the two as necessary. To seize and activate a trunk when channel matching between the incoming and outgoing trunks fails or when the trunk is all busy when making an outgoing connection in a register sender separate type telephone exchange that performs the function of a register sender. Instead, select and capture the first outgoing sender, connect the register and the first outgoing sender, and after receiving all the numbers, start the common control device (marker) again, select and capture the trunk, and connect the register between the trunk and the incoming line. At the same time as retrying channel matching, a second outgoing sender is newly selected and acquired, the second outgoing sender and the trunk are connected, and the numerical information received and accumulated by the first outgoing sender is transferred to the above. An outgoing connection control method characterized by transferring data to a second outgoing sender.