JPH0226496A - Data holding system for subscriber concentrator - Google Patents

Abstract

PURPOSE:To strenuously reduce the charging impossible time of a subscriber data change after maintenance working by using an E<2>ROM for the holding of station data and subscriber data, saving data before changing, holding a flag to notice that it is in changing and making it have a function which can be restored when a power source revives. CONSTITUTION:When a CPU 2211 receives a changing order from an exchange control part 12, a changed spot is found, an address, the number of changing reading and data before changing are obtained and are written with a flag and status at a saving area within an E<2>ROM(Electrically erasable Read Only Memory). Then, the program of an emergency call processing control part searches the effectiveness of the flag of the saving area and the value of the status when the power source rises, restores them to the consent before changing according to the content of the saving area when it is considered that power source disconnection is generated halfway, and the value of the status is reset.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a subscriber line concentrator that concentrates and multiplexes subscriber groups located far from an exchange and accommodates them in an exchange using digital multiplex lines. Data retention method [Prior art] Conventionally, emergency call processing equipment in subscriber line concentrators processes calls when disconnected from the exchange, so station data indicating the implementation status and operating environment such as number analysis tables is stored. This data is reloaded from the switching center as necessary, or is rewritten by sending change data only to the necessary parts when making changes. Generally, emergency call processing devices do not have a redundant configuration for economical reasons, so when the power is turned off for maintenance work, the contents are lost and the device must be reloaded.

[Problem to be solved by the invention]

The conventional data retention method described above sends a large amount of data at a transmission rate that does not disrupt online call processing every time the power is turned off, making it impossible for subscriber data to be changed during that time, and maintenance personnel The disadvantage is that when the user tries to check the normality, the user must wait until the process is completed.

[Means to solve the problem]

The present invention uses a non-volatile electrically erasable ROM as a memory for storing station data and subscriber data in a data retention system of a subscriber line concentrator without redundancy,
In preparation for a power outage during the change, the data before the change is saved along with a flag in the save area in the ROM when the change is made, the contents of the flag are checked when the power is restored, and the data is returned to the state before the change when necessary. be.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure,
Reference numeral 1 indicates a switching center, which uses a subscriber concentrator 2 using a digital multiplex line 3 and a subscriber concentrator interface 13.
It is accommodated through.

The subscriber line concentrator 2 includes a line concentrator 21 that accommodates and multiplexes subscriber telephones 4-1 to 4-n, and an emergency line that processes calls when the digital multiplex line 3 becomes unavailable due to a failure or the like. It consists of a service trunk module 23 that accommodates service trunks 232-1 to 232-i that include a tone source necessary for emergency call processing, a PB signal receiver that receives a PB double signal, and the like. . Typically, the subscriber telephone 4-i is connected to the subscriber interface circuit 212-i, and the digital multiplex line 3 assigned by the switching center controller 12 when the call is made.
It is connected by a concentrator switch 211 so as to be connected to one channel above, and is connected to the exchange network 1 to 11. When the digital multiplex line 3 becomes unusable due to a failure or the like, the changeover switch 213 switches the communication path to the emergency call processing device 22, and the emergency switching network 222 is connected to the emergency call processing device control unit 221 under the control of the emergency call processing device control unit 221. Connected using an exchange. When the station data and subscriber data necessary for call processing are changed by inputting a command at the exchange,
When all data is reloaded based on the judgment of the maintenance personnel, the station data is read from the backup area for the subscriber line concentrator of the exchange control unit 12, and the subscriber data is read out by the exchange 1. The information for the relevant subscriber is extracted from the subscriber network and sent to the subscriber line concentrator 2 through the control channel on the digital multiplex line 3.

FIG. 2 shows a detailed configuration example of the emergency call processing device 22. As shown in FIG. The control unit 221 includes a central control circuit (CPtJ) 2211. ROM 2212, which holds programs and fixed data. -Random access memory (RAM) 2 for holding temporal data
213. and E2, which is non-volatile and can be electrically erased.
ROM (Electrically Erasable)
e Read 0nly Men+ory)
It consists of 2214. In addition, the emergency switching network 22
2 is a multiplex circuit 2223. Demultiplexing circuit 2224, time switch 2222. And time switch control section 222
It consists of 1.

FIG. 3 shows the configuration of the data save area in the E2R○M 2214 for resetting to the state before the change when the power is restored when the power is cut off during the change. When the CPU 2211 receives the change order from the exchange control unit 12, it determines the change location, obtains the address, the number of changed reads, and the data before the change, and saves it to the save area in the E2ROM 2214.
Write with ag and 5tatus.

The flag writes a fixed pattern to indicate that the data is valid, and the 5tatus is used to determine whether this data needs to be returned when the power is turned on, and remains until all changes are completed. It holds the value and when everything is completed it is reset and returns the termination sensor to the exchange. The data written to this save area is configured to be linked by several index tables based on the storage location and telephone number, especially when subscriber data is changed, and the final write memory area has not been prepared. , to be hunted from a pooled sky area,
The number of addresses for changing such data is large. The start address, number of words, and data contents before change are sequentially set in the save area as shown in FIG. 3, and finally, the index mark is written. When the power is turned on, the program of the emergency call processing control unit checks the validity of the flag and the value of 5tatus in this save area. Return to the contents before the change and reset the value of 5tatus. Maintenance personnel at the switching center will receive a completion report from the emergency call processing equipment only when all processing is completed, so they will be able to know when the changes have been completed.If the power is cut off midway, an error will be displayed due to the completion report timeout. , so you will have to re-enter it.

〔Effect of the invention〕

As explained above, according to the present invention, the E2 ROM is used to hold station data and subscriber data, and in order to prevent data from being destroyed due to a power cut during writing due to the long writing time, the E2 ROM is used to hold station data and subscriber data. By providing a function that allows data to be restored when power is restored by saving data and retaining a flag that indicates that it is in the process of being changed, the data backup time for emergency call processing equipment in subscriber line concentrators that do not have a redundant configuration can be saved. It can be eliminated. As a result, this has the effect of minimizing the time during which subscriber data cannot be changed after maintenance work6.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing one embodiment of the present invention, and FIG.
FIG. 3 is a diagram showing a detailed configuration of the emergency call processing device shown in the figure, and is a configuration diagram of a save area for data before change. 1... Switching station, 11... Switching network, 12.
...Switching center control unit, 13...Subscriber line concentrator interface, 2...Subscriber line concentrator, 21...Line concentrator multiplexer, 211...Line concentrator switch, 212-1 to 21
2-n...Subscriber interface circuit, 213...
- Changeover switch, 22...Emergency call processing device, 221
... Emergency call processing device control unit, 222 ... Emergency switching network, 2211 ... Central control circuit, 221
2...ROM, 2213...RAM, 2214...
・E2ROM, 2221... time switch control unit,
2222... Time switch, 2223... Multiplex circuit, 2224... Multiplex/demultiplex circuit, 23... Service trunk module, 231... Multiplex/demultiplex circuit, 232-1 to 232 i... Service trunk,
3...Digital multiplex line, 4-1 to 4-n...Subscriber telephone. Kaya twice

Claims (1)

[Claims] In the data retention system of subscriber line concentrators that do not have redundancy, a non-volatile and electrically erasable ROM is used as the memory to retain station data and subscriber data, and this change is made in case the power is cut off during the change. Data retention for a subscriber line concentrator, characterized in that data before change is saved together with a flag in a save area in the ROM, the content of the flag is checked when the power is restored, and when necessary, the data is returned to the state before change. method.