JPS58141063A - Save method for call information - Google Patents

Abstract

PURPOSE:To allow call information to save without providing any expensive external device by transferring a connection state stored in a main storage memory to internal storage means of a trunk and a line circuit when a call state changes. CONSTITUTION:When a subscriber SUB.A in a figure (a) performs off-hook operation, the off-hook information is sent out to a central controller CC as shown in a figure (b). Then, the central controller discriminates a connection task to be processed by next on the basis of the connection state number of the connection state memory in the main storage memory and change information to run the connection task, and processes the selection of an originating register trunk ORT, a link connection between the SUB.A and ORT, the transmission of control information to the ORT for the transmission of a dial tone (DT), etc. are processed; and the STN in the MM and connection state memories in the line circuit LN and ORT is set in a memory X and accomodation position information on a destination of connection set the SUB.A in the memory of the ORT, and the accomodation position of the originating register trunk ORT is set in the memory of the SUB.A to complete processing from the figure (a) to the figure (b).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a call information saving method for relieving a call in progress when a failure occurs in an electronic exchange.

Conventionally, this bulk of call information can be saved by providing an external storage device such as a TIF device and a well-known DMA@ function to enable memory access to the main memory from an external storage control circuit. By specifying the start address, end address, and transfer lid of the main memory where the connection state is stored and executing the fc ridge channel control command, the contents of the connection state memory in the main memory are determined using a known DNA function. Since the 1990s, external storage devices and control circuits have become expensive to save ff information, and the memory contents have been saved at regular intervals regardless of the connection status, so processing This has the disadvantage that the processing capacity of the device is reduced.

An object of the present invention is to provide a method that allows call information to be saved without requiring expensive external devices and control functions as described above, and without reducing the processing capacity of the central processing unit. .

The call information saving method of the present invention stores the connection status of a call in the main memory, and when a change in status occurs, the program identifies the next connection to be made based on the connection status at any time and controls the connection. In an electronic switching system that performs
By immediately transferring the connection state stored in the main memory to the internal storage means of the trunk and line circuits via the central controller and the microprocessor, call information is always saved in the line circuits and trunk circuits. It is characterized by having a structure.

Next, a major embodiment of the present invention will be explained with reference to the drawings. FIG. 1 shows a relay system diagram of an electronic exchange using a line circuit LC and a trunk circuit TRK and an internal microprocessor MCk'U. FIG. 2 is a configuration diagram of the connection state memory shown in FIG. 1. Figure 3 is the line circuit diagram shown in Figure 1, Figure 4 is the trunk circuit diagram shown in Figure 1, and Figure 5 (m, (b)).
7 is a state transition diagram when extension subscriber 5UB-A is turned off.

In Figures 1 to 4, changes in the status of subscriber lines and trunk lines are normally monitored by the microprocessor NCPU via the order decoder DEC inside the line circuit LC trunk circuit TRK, and when a status change is detected. The change information is sent to the central control unit CC via the interface circuit INT. Having received the change information, the central control unit & CC identifies the connection task to be performed next based on the connection state number and change information of the connection state memory in the main memory memory MV. After this, the central controller CC performs this connection task, and the switch 5W
NET connection, control of recovery, and transmission of control information to the line circuit LC and trunk circuit TRK are performed via the interface circuit INT, and the connection status number of the connection status menu JE in the main memory NM is stored as follows. At the same time, the line circuit LC, ), r
The connection status number is sent to the link circuit TRK. As a result, the line circuit LC and the microprocessor NC)'U inside the trunk circuit TRK which received the reverse connection status number are
Own connection status memo I) Write the number to M and complete the process for one status change. Note that 80 shown in Figure 1
B-A-N indicates extension subscriber (JRT indicates calling register trunk).

Next, the actual call transition will be explained with reference to FIGS. 5(a) and 5(b).

FIG. 5(a) is a transition diagram when the telephone is hooked up from an empty state with an extension subscription of $81JB-A. This (a
In figure J, 8TJB-A shows an empty state, and line circuit L
The connection state number 8TN in the 5UB-A connection state memory in the C and main memory NN and the connection destination storage location information are all 0.0 When 5IJB-A goes off-hook from this state, the connection state number 8TN in the 5UB-A connection state memory in the main memory memory NN is 0. The off-footer information is sent to the central controller CC via the interface device ANT.
sent to. After this, the central controller CC performs the multi-connection task in the manner described above and performs the outgoing register trunk (JR
Selection of T, link connection between 5tJB-A and C) ftT,
In order to send dial tone (DT), processing such as sending control information to the transmission register trunk θRT is performed, and 8'll of the connection state memory in the main memory MM, the line circuit LC, and the transmission register trunk ORT is In addition, connection destination accommodation location information is set in the memory of the originating register trunk ORT for 5UB-A, and in the memory for 80B-A, the accommodation location of the originating register trunk (JRT) is set respectively (from Figure 511 to Figure bJ). The above process is completed.O As an embodiment of the present invention, the case where the line circuit LC and the trunk TRK include the microprocessors MC'U and M is explained above. It has 7 liplocks or butterfly registers, etc., and it is possible to write and read directly from the central control unit CC using IO control commands, making it possible to easily perform the same processing as above.In addition, it is possible to easily perform the same processing as above when a failure occurs. From the perspective of relieving only the central control unit C, the central control unit
It also becomes possible to improve the processing capacity of the PU.

As explained above, the present invention includes a memory, a microprocessor, a flip 70 tube, a register, etc. inside the line circuit or trunk circuit, and stores the connection state in the line circuit or trunk circuit at the time of state transition. This has the advantage that call information can be saved without requiring expensive external equipment) and that complicated hardware and software designs are not required.

[Brief explanation of drawings]

FIG. 1 is a relay system diagram of an exchange according to the present invention, and FIG. 2 is a main storage memory and twin shown in FIG. m1. A configuration diagram of the connection status memory inside the trunk, Figure 3 is the line circuit diagram shown in Figure 1, Figure 4 is the trunk circuit diagram shown in Figure 1, and Figures 5 (a) and (b) are extension line connection diagrams. This is the cause of the state transition when the user goes off-hook. be... line circuit, TRK... trunk circuit, MCPTJ... microgross section f
, 8WNET...Switch network, IN
T...Interface circuit, CC...
・Central control unit, MV main memory, N...Line trunk internal memory, I)EC...Order decoder, 5UB-A~N...Extension subscriber A ~N, ORT...Outgoing register trunk, 8
TN...Connection status number. Bamboo 1 figure Jibome 7N7'＼ 9f53 Figure M INT to foil figure 4 [A dog @ A) [Barb B]

Claims (1)

[Claims] In electronic exchanges, the connection status of a call is stored in the main memory, and when a change in status occurs, a program identifies the next connection to be made at any time based on this connection status, and performs connection control. Each of the circuits has means for storing individual connection states and a microprocessor, and when a change in the call state occurs, the connection states stored in the main memory are transmitted via the central controller and the microprocessor. A call information saving method characterized in that the call information is immediately transferred to internal storage means of the trunk and the line circuit.