JPS5920226B2 - Time reading method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a time reading system, and particularly to a time reading system in an automatic private branch exchange having the function of reading time information from a two-ware clock.

In automatic private branch exchanges, a method is adopted in which time information necessary for managing central line call charges, recording failures, etc. is automatically read from a hardware clock. FIG. 1 is a relay system diagram showing an example of an automatic private branch exchange to which the present invention is applied.

In Figure 1, the central controller CC is a hardware clock T.
The time information of the IM is read at regular intervals via a scanning device SCN that scans the operating status of the line relay 5 in the network NW and the various relays in the various trunks TRK. In the conventional time reading method used in such an automatic private branch exchange, the hardware 10
As shown in FIG. 2, the time information issued by the clock TIM is stored in three rows ROW-O, ROW-O, of the scanning matrix of the scanning device SCN.
In ROW-1 and RσW-2, monthly 10th MOT, monthly 10th place MOU, daily 10th place DT, daily DU, hour 10th place HT, hour unit 1 minute 10th place MIT, minute unit 15 MIU, second 10th place ST and Each binary digit is given in units of seconds SU.

Further, each row ROW-O, RσW-1, and RσW-2 is provided with carry bits Co, Cl, and C2, respectively, which are turned ON while the numbers in the row are being carried. Each time the central controller CC reads 20 said time information via the scanning device SCN, the central controller CC reads each row ROW-O, ROW-1 and R.
Detect carry bits Co, Cl and C2 in OW-2. Carry bits Co, Cl, and C2 are all OF
If it is F, the read time information is determined to be normal 25 and is stored in the main memory device MM. If carry bits Co, Cl
, C2 is ON,... - It is determined that the toeware clock was in the process of carrying up the time information at the time of reading, and the read time information is not adopted and is transferred to the scanning device SCN again. 30-Start scanning of toeware clock TIM. As is clear from the above explanation, in a conventional time reading method, each row ROW-O, ROW-1
and carry bits Co, Cl and C2 to RσW-2
This occupies many scanning points of the scanning device SCN in order to read the 35 time information from the hardware clock TIM, which also has a negative impact on the economic efficiency of the automatic private branch exchange.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the conventional time reading methods as described above, to reduce the number of scanning points of a scanning device required for time reading, and to realize an economical time reading method.

The purpose of this is to detect that the hardware clock is carrying up in an automatic private branch exchange that has a function of reading time information consisting of multiple words one word at a time from the hardware clock at predetermined synchronization intervals. means for starting reading from a specific word containing 1-bit carry information;
After all the time information has been taken, the specific one
means for reading the word again, and the read time information when it is detected that none of the carry-in-progress information included in the specific word read twice indicates that a carry operation is in progress; This is achieved by providing a means for determining that the condition is normal.

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4.

FIG. 3 is a diagram showing the arrangement of time information on scanning points given from the hardware clock TIM to the scanning device SCN in a clock reading method according to an embodiment of the present invention. The relay system of the target automatic private branch exchange is shown in FIG. In Figure 3, the carry bit C indicates that the hardware clock TIM is carrying the time information.
Only one bit is provided in row ROW-0. Therefore, each binary digit from the month digit MOT to the second unit SU, as shown in FIG. 2, including the carry bit C, is stored in two rows ROW-0 and ROW-1 of the scanning matrix. It will be done. Next, a process in which the central control unit CC reads time information from each row ROW and RσW-1 via the scanning device SCN will be explained with reference to FIG. Since the minimum time unit included in time information is the second, the hardware clock is 1
A carry operation of the time information is carried out every second, and the carry bit C in row ROW-0 becomes 0N for a certain period of time (for example, about 1 millisecond) at a period of 1 second, as shown in FIG. During the time when carry bit C is 0N, the time information displayed in rows ROW-0 and RσW-1 is unstable during the carry operation, and the information read through the scanning device SCN during that time cannot be used. becomes. Accordingly, in response to a command from the central controller CC, the scanning device SCN scans RσW-0 while the carry bit C is 0FF, as shown in scanning example 1 in FIG.
Assuming that the carry z raise bit C is 0N at the time of scanning OW-1, the time information included in row ROW-1 is unstable because the carry operation is in progress, but the time information included in the row scanned just before is Carry bit C included in RσW-0 is 0F
F, the central control unit CC erroneously determines that the time information read in scanning example 1 is normal.

In order to prevent such misjudgment, in this embodiment, the central control unit CC uses the scanning device SCN when reading time information.
After scanning each row ROW-0 and RσW-1, a command is given to scan row ROW-0 again. Fourth
As in Figure Scanning Example 2, the carry bit F.
If C is 0FF, the carry bits C read from row ROW-0 by two scans are both 0FF, and in this case, the central controller CC reads data from rows RσW-0 and ROW-1. The read time information is determined to be normal and is stored in the main memory device MM. Next, scan example 3 and scan example 4
In the above, carry bit C was 0FF when row ROW-0 was scanned for the first time, but carry bit C was 0N when row ROW-0 was scanned for the second time, so the central control The device CC judges that the read time information is in a carry operation and does not use it. In addition, in scanning example 5, row RO
Since the carry bits C obtained by scanning WO twice are both 0N, the central controller CC determines that the read time information cannot be adopted. Furthermore, scanning example 6 and scanning example 7
In the first scan of row ROW-0, carry bit C is 0N, and in the second scan of row ROW-0, carry bit C is 0FF, but even in such a case, the central controller CC It is determined that the time information read cannot be adopted. As described above, the central control unit CC scans row ROW-0 before and after scanning row ROW-1, and if at least one of the carry bits C read twice is 0N, then the It is determined that the read time information cannot be adopted. Note that since the interval between adjacent scans by the scanning device SCN is several microseconds, the carry bit C is 0FF when scanning row ROW-0 twice before and after, and the middle row ROW
It is impossible that only the scan time point -1 is in the process of carrying the time information. As is clear from the above explanation, according to this embodiment, the time information issued from the hardware clock TIM is stored in two rows RσW-1 on the scanning matrix of the scanning device SCN by setting the carry bit C to 1 bit. The number of occupied scanning points can be reduced to two-thirds compared to the conventional method.

However, ROW-0 containing carry bit C is transferred to another row ROW-0.
By scanning before and after 1, it is possible to determine whether or not to adopt the reading time information without error. Note that FIGS. 3 and 4 are merely examples of the present invention, and for example, the structure of time information, the number of scanning points included in one line, and even the number of lines constituting time information are also shown in FIG. but not limited to,
In either case, the effects of the present invention remain the same. As described above, according to the present invention, by setting the carry information indicating that the time information carry operation of the hardware clock is in progress to 1 bit, it is possible to reduce the number of scanning points of the scanning device required to read the time information, which is economical. This makes it possible to realize a time reading method.

[Brief explanation of the drawing]

Fig. 1 is a relay system diagram of an automatic private branch exchange that is the subject of the present invention, Fig. 2 is a diagram showing an example of time information in a conventional time reading method, and Fig. 3 is a diagram showing time reading according to an embodiment of the present invention. FIG. 4 is a diagram showing the time information reading process shown in FIG. 3. In the figure, NW... network, TRK...
...Trunk, TIM...Hardware clock, SCN...Scanning device, CC...
Central control unit, MM...Main memory, ROW-
0, R0W-1, R0W-2...Row on the scanning matrix, MOT...Ten of the month, MOU...
...Monthly, DT...Tenjui, DU...
unit, HT......hour, book...hour, MIT...minute, MIU...
Minute units, ST......seconds, SU...seconds, CO, Cl, C2, C...carry bits.

Claims (1)

[Claims] 1. In an automatic private branch exchange that has the function of sequentially reading time information consisting of multiple words from a hardware clock at predetermined intervals, one-bit digit indicates that the hardware clock is in the carry-up operation. means for starting reading from one specific word including the current time information; means for reading the specific one word again after reading all the time information; and the specific one word read twice. and means for determining that the read time information is normal when it is detected that none of the carry-in-progress information included in the carry-in operation indicates that a carry operation is in progress. .