JPS59115646A - Continuous call type storage exchange - Google Patents

Abstract

PURPOSE:To ensure take-over of call control information by accessing simultaneously a duplicated data memory with systems in operation to bring them into the same state and using one data memory by the other system at system changeover. CONSTITUTION:A data memory 5(DE) is an RAM storing data for storage exchange and call control information of users. Further, the memory is characterized in having a memory selecting circuit 4 (MSEL) and a DM, and the MSEL connects a DM 0/1 to a system in operation. Then, the DM 0/1 are accessed simultaneously with a CPU or an LCTL (line control section) in operation, and the same content is written. The DM0 is accessed from the system of the CPU0 and the DM1 is accessed from the system of the CPU1 at readout of the DM. As a result, when the operating system is switched from the CPU0 to the CPU1, the CPU1 takes over all of call control information and stored data information, and the service is restarted while keeping a call being established under the program control in the DM1.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Application of the Invention The present invention relates to guaranteeing the continuity of an established call when switching over a duplexed storage/switching system. However, when a call is generated or established, the storage device is rewritten only in the operating system. As a result, if the system is switched for some reason, the system is controlled using the standby storage device that does not store the call status, so the current call is initialized and a new call establishment procedure is started. When switching between systems without operating the processes of both systems in synchronization, the call equipment during communication is transferred to memory for programs and work areas, and data for storing call control information and communication data. The dual data memory is accessed simultaneously by both operating systems to maintain the same state, and when the system is switched, one data memory is transferred to the other. In FIG. 1, +Vi processing device N <CPUo/1° last o/+
The distinction between 842 and multiplex systems is shown. 2 is a program and work area memory pMo/1.5 digits internal bus BUSO/+, 4 digits memory selection circuit MSEL,
5 data memory (DI), 6 line control unit (LCT)
LO/1), 7 is a line selection circuit (LSEL).

8 is a multiplexing section (MpX), and 9 is a line correspondence section (w). In this device, the CPU is a general processing device;
It can be configured with a micro combinator or the like. PM
It consists of a program controller that controls this device, and a RAM that serves as a work area memory used by the program.

BUS is CPU.

This is an internal bus of this device that connects PM, DM, and LCTL. DM is data that is stored and exchanged by a single device.

This is a RAM for storing user call control information. L
CTL is a die reflex for sending and receiving gators that are exchanged without equipment between LU and UE! - It is a memory access controller. LSEIJd This is a selection circuit for switching the duplex system. LMpX is a multiplexing circuit for multiplexing a large number of LUs each having a serial/separate conversion function for each line. A feature of this device is that it controls MSEL and Dhf, and MSEL operates to connect DI#J/I to the operating system.

This allows the CpU or LCTL of the thread to be
Mo7+-\ can be accessed at the same time and the same content can be inserted. Furthermore, when reading DM, the CPU
The o system accesses DMo, and the CPU 1 system accesses DMl. As a result, the operating system is changed from CPU0 to CPU1.
When switching to pM1, the CPU 1 takes over all the call control information and accumulated data information, and the service can be resumed while the call being established under program control in pM1 continues.

Next, the operation of the MSEL will be explained in detail using FIG. In FIG. 2, 10 is a 2-1 selection circuit (2-ISE
L) is an 11-gate circuit. 2-1SEL is B
It has the function of selecting signals (address, write data, control signals) to be sent from US to pDM. The gate circuit is DM
When switching the DM system using a strobe signal from the access system, the call control data and stored data before switching can be inherited, so one call in progress can be disconnected. It is very effective in resuming communication without having to do anything.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a storage and forwarding machine according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of the MSEL of FIG. 1. 1: Processing unit, 2 Niprogram and work area memory. 5: Internal bus, 4: Memory selection circuit, 5: Data memory, 6: Line control section, 7: Line selection circuit,
8: Multiplexing section, 9 two-line corresponding section, 40: 2-1
Selection circuit, 11: Gate circuit. Representative Patent Attorney Susuki 1) Kosai Toshi 1 Figure 5 Fang 2 Figure

Claims (1)

[Claims] 1. In a storage/switching system that uses a standby standby system with a duplex configuration, the storage device is divided into memory for programs and work areas, memory for exchange data storage, and memory for storing call control information, and the system is duplicated from the operating system. 1. A continuous call storage switching system characterized by having a function of storing both exchange data and writing to a memory for storing call control information at the same time.