JPS59115655A - System for measuring level of time division exchange - Google Patents

Abstract

PURPOSE:To supply always a measuring reference signal at a prescribed level without error by a measuring desired frequency component only by providing a function transmitting its level measuring signal transmission to a signal frame having a highway transmitting and receiving a signal through the transmission/ reception of a time slot and a time division switch. CONSTITUTION:The signal frame 10 transmitting and receiving a conventional MFC signal or the like is connected to the time division switch 3, a signal of a reference level is superimposed on a part of a time slot on the highway between the switch 3 and the frame 10 from a reference signal generator 11 in the signal frame and transmitted to the switch 3. The switch 3 extracts the time slot of the measuring desired frequency by the time division control of a controller 5 and transmits the time slot to a measuring line by the control of time slot replacement. In connecting a selecting level meter 11 to an output side of the measuring line, the level measurement of the desired frequency is attained for many times by having only to match the frequency of the level meter to any of frequencies 6, 7, 8 and 9. Further, the measuring signal having no frequency error with the signal on the preceding measuring line and of the level without level error is transmitted to other measuring line by the control of the controller 5.

Description

[Detailed description of the invention] υ, particularly regarding the method of transmitting the measurement reference signal.

Ru. Conventionally, when attempting to measure the level frequency characteristics of a line in a time division exchange, as shown in Figure 1, a variable frequency line oscillator 1 was connected to the input side of the line to be measured, and a level meter 2 was connected to the output side. While changing the 10 frequencies, I read the level at 2 and measured the frequency characteristics of the υ line.

However, according to this method, when one line is changed, an error occurs in the set measurement frequency compared to the previous line. Furthermore, for each line, the frequency must be carefully varied by the number of measurement points each time to create a highway that can continuously transmit and receive signals at a constant level without error by the number of waves using split switches and time slots. By equipping the signal rack with a level measurement signal sending function, the basic function of time slot conversion of time division exchange is used to input a level measurement signal with a frequency setting error of λli ( It is also easy to convert the measurement line into a level measurement reference signal.Figure 2 shows how to connect and sell a 17-bell measurement reference signal to a time division switch.

The first part and fifth part and operation will be explained below. A signal rack 10 for transmitting and receiving conventional NFC signals etc. is connected to the time division switch 3.
Connect the time slot i on the highway between 10 and 6.
A signal of the current level for each measurement frequency is placed on a part of the reference signal generator 11 in one speech rack (as an example in the figure: 500/72 signal, 7°60011z signal, 8
:803#z signal, 9:+0OOH2 signal) 3. 5 extracts the time slot of the frequency desired to be measured by the time division control of the control device 50 and sends it to the measurement line by time slot replacement control. According to this embodiment, it is possible to repeatedly send out measurement signals of different frequencies to the same measurement line by simply changing the extraction time slot using the control in step 5. If the selection level meter 11 is connected to the output side of the measurement line, the frequency of the level meter can be set to 6.
．． 7, 8, or 9, the level of the desired frequency can be measured as many times as desired. In addition, by the control in step 5, when measuring the frequency characteristics of each line to other measurement lines, it is possible to measure the same level with no frequency error and no level error with the previous measurement line. The effect is that the measurement time can be significantly shortened, since the measurement frequency can be easily varied by software commands or the like in a sequential and periodic manner.

[Brief explanation of the drawing]

Figure 1(e) is a connection diagram of a conventional measurement method using a measurement signal oscillator to measure the level of a time-division exchange line.
FIG. 2 shows an embodiment of the present invention in which a signal with a constant reference frequency is allocated to the time slot of the highway between the signal equipment and the time division switch in order to measure the level of the time division exchange line. FIG. 1: Frequency IjJ variable transformer oscillator two-level meter, 51 time division switch, 4:
, trunk with 4/D converter, 5. 6: 5oollz (1) 4M p ims C1t, 7: 600#t signal time a1-18
: 801M7z signal time slot, 9:10
00Rz signal time slot, 10: Signal rack (equipment)
, 11: Reference signal generator. Back I Figure 3 Age 2 Figure

Claims (1)

[Claims] 1. In line level measurement in a time-division exchange, a conventional digital signal having functions such as transmitting and receiving NFC signals and transmitting a dial tone is used in the transmitting device of the level measurement reference signal. 1.Use a device to send measurement reference signals of different frequencies to several time slots sent out from the signal device to the time division switch rack. ,
A time-division exchange characterized in that the time slot carrying the measurement reference signal is sent to a predetermined measurement line by time-division switch control using time slot conversion, and then the signal level is measured at the output end of the line. level measurement method.