JPS6077234A - Selecting method of magnetic tape device - Google Patents

Abstract

PURPOSE:To attain initial program loading also from a magnetic tape device set up in an unmanned station if necessary by forming a means for exchanging the machine numbers of two magnetic tape devices when a prescribed signal is received from the external. CONSTITUTION:The magnetic tape devices 3, 4 are set up in an unmanned station and a maintenance station respectively. When a command for executing initial program loading by using the device 4 is to be transmitted from an input device set up in the maintenance station to an electronic exchange, the gates 22, 24 in a magnetic tape access control part 7 are blocked through a signal line 14. When the machine number X=A, a signal of logical ''1'' is outputted from a gate 28 and a magnetic tape control part 8 is selected and started. If the machine number X=A+1, a signal of logical ''1'' is outputted from a gate 26 and a magnetic tape control part 11 is selected. Thus, the initial program loading can be attained also from the unmanned control part 8 if necessary by forming the means for exchanging the machine numbers of the magnetic tape devices.

Description

[Detailed Description of the Invention] +a) Technical Field of the Invention The present invention relates to a magnetic tape device selection method, and particularly to an electronic device having two magnetic tape devices that are selectively activated by specifying unique device numbers. Concerning a magnetic tape device selection method in an exchange.

fbl Prior Art and Problems When an electronic exchange installed in an unmanned station is maintained by maintenance personnel stationed at a distant maintenance station, data collection and settings that are performed on a daily basis, such as saving files or adding subscriber data, are required. For this work, it is necessary to install a magnetic tape device not only inside the unmanned station but also at the maintenance station. FIG. 1 is a diagram showing the configuration of a magnetic tape device in this type of electronic exchange. In FIG. 1, a central control unit (not shown) of the electronic exchange is connected to a magnetic tape device 3 installed in an unmanned station via a data channel device 1 and an input/output interface 2, and also controls the magnetic tape device 3. Line control section 9
It is also connected via a line 5 to a magnetic tape device 4 installed at the maintenance station. Each magnetic tape device 3 and 4 is assigned a unique machine number (for example, A and A+1). The magnetic tape access controller 7 in the magnetic tape device 3 accesses the data channel device 1 via the input/output interface 2 and the input/output interface controller 6.
By identifying the machine number A or A+1 transmitted from and the data channel device 1. On the other hand, the central control unit has an initial program loading function, and
When the function is activated, a specific magnetic tape device (e.g. 3)
is selected, and an initial program load is executed from the magnetic tape 10 loaded in the magnetic tape device 3. Note that the initial program load function is used when restarting the electronic exchange in the event of a failure, so having the central controller specify the model number of the magnetic tape device to be selected each time it is started up may cause malfunctions. There is a grudge, and in many cases, a magnetic tape device with a predetermined specific machine number is used.

As is clear from the above description, in the conventional magnetic tape device selection system, the magnetic tape devices that can be used are limited when an electronic exchange executes the initial Progera J.Roth. Therefore, for example, if the magnetic tape device 3 is set for initial program low F in FIG. It takes. As a countermeasure, it is considered to designate the magnetic tape device 4 installed in the unmanned station for initial program loading, but if maintenance personnel go to the unmanned station, initial program loading becomes impossible.

(c+ Object of the Invention The object of the present invention is to provide a means for eliminating the drawbacks of the conventional magnetic tape device selection method as described above, and to enable initial program loading from a magnetic tape device installed in an unmanned station as necessary. The objective is to realize this without placing any burden on the central control unit.

(di) Structure of the Invention This object is to provide an electronic exchange equipped with two magnetic tape devices that are selectively activated by specifying their respective unique device numbers, when a predetermined signal is received from the outside. This is achieved by providing means for exchanging the machine numbers of the magnetic tape devices in the stand.

te+ Example of invention An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a diagram showing a magnetic tape access control section according to an embodiment of the present invention. Note that the same reference numerals indicate the same objects throughout the figures. In FIG. 2, setting port 17816
The machine number of the magnetic tape device 3 is set in advance.

Note that the machine number A is an even number (the lowest focus is a logical value O).

The machine number X sent from the data channel device 1 (Fig. 1) to the input/output interface 2 is sent to the magnetic tape access control unit via the input/output ink face control unit 6 and the machine number reception signal line 13 (Fig. 2). 7 is stored in the register 15. The bits other than the least significant bit of the machine number
transmitted to. Therefore, if the machine number X is equal to the machine number of the magnetic tape device 3, the verification circuit 17 and the gate 19
If the device number X is equal to the device number A+1 of the magnetic tape device 4, the verification circuit 1
7 and gate 18 output a signal with a logic value of 1.

On the other hand, if the command to execute the initial program load using the magnetic tape device 4 is not transmitted to the electronic exchange from the input device installed in the maintenance station, the magnetic tape access control unit Since a signal of logic value 1 is not set in the initial program low 1 signal receiving gate 20 of 7, the gates 21 and 23 become conductive, and the gates 22 and 24 become blocked. As a result, if the machine number
In addition, if the machine number X=A+1, the logic value 1 is
A signal is output, and the magnetic tape control section 11 is selected and activated via the line control section 9. On the other hand, when a command to execute an initial program load using the magnetic tape device 4 is transmitted from the input device to the electronic exchange, the initial program load of the magnetic tape access control section 7 is transmitted via the initial program load signal line 14. Signal receiving gate 20
A signal with a logical value of 1 is set at , gates 22 and 24 are in a conductive state, and gates 21 and 23 are in a blocking state. As a result, if machine number X=A+1, a signal with a logical value of 1 is output from the gate 26, and the magnetic tape control section 11 is selected and activated via the line control section 9.

As is clear from the above explanation, according to this embodiment, when the initial program low i function provided in the central control unit is activated, the data channel device 1 always sends the machine number A.
However, depending on whether the command is sent from the maintenance station or not, the magnetic tape access control unit 7 can be used as either the magnetic tape device 3 installed in the unmanned station or the magnetic tape device 4 installed in the maintenance station. It is now possible to select and execute the initial program load.

Note that FIG. 2 shows only one embodiment of the present invention; for example, the machine number A of the magnetic tape device 3 is not limited to an even number, and the effects of the present invention do not change even if the machine number A is an odd number. Furthermore, the machine numbers of the magnetic tape devices 3 and 4 are not limited to consecutive A and A + 1, and many other modifications may be considered, but the effects of the present invention will not change in any case. Furthermore, the configuration of the magnetic tape access control section 7 is not limited to that shown in the drawings, and many other modifications may be considered, but the effects of the present invention will not change in any case.

(fl) Effects of the Invention According to the present invention, in the electronic exchange, initial program loading can be executed using a magnetic tape device installed in the maintenance station without placing any burden on the central control unit. It becomes possible for the electronic exchange to resume operation quickly.

[Brief explanation of drawings]

FIG. gA1 is a diagram showing the configuration of a magnetic tape device in this type of electronic exchange, and FIG. 2 is a diagram showing a magnetic tape access control section according to an embodiment of the present invention. In the figure, 1 is a data channel device, 2 is an input/output interface, 3 and 4 are magnetic tape devices, 5 is a line,
6 is an input/output interface control unit, 7 is a magnetic tape access control unit, 8 and 11 are magnetic tape control units, 9 is a line control unit, IO and 12 are magnetic tapes, 13 is a machine number reception signal line, and 14 is an initial program Low]・Signal line, 15
is a register, 16 is a setting circuit, 17 is a verification circuit, 18.
19. 21 to 26 are gates, and 20 is an initial program load signal receiving gate. p near-', + 1]''

Claims (1)

[Claims] By specifying unique machine numbers for each, in an electronic exchange equipped with two magnetic tape units that are selectively activated, the machine numbers of the two magnetic tape units can be determined when a predetermined signal is received from the outside. A magnetic tape device selection method characterized by providing a means for switching.