JP2000013467A - Method and device for monitoring line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily monitor the state of using a line, through which data are transmitted, by a user according to a transmission standard wherein a user data write area is cyclically allocated onto the time base. SOLUTION: At prescribed time for each user data write area U, the logic level of a line is detected and this detected logic level is held until the said prescribed time of the next write area. Based on the held logic level, a display device for monitor is driven. From such a display state, the using state of the line is monitored.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a method for a line maintenance operator to monitor the line use status of a line user (hereinafter, a user) and an apparatus suitable for carrying out the method.

[0002]

2. Description of the Related Art For example, the line maintenance operator
The user's line usage status is monitored for management and the like. On the other hand, as one type of line, there is a line through which data is transmitted according to a transmission standard in which a user data write area is periodically allocated on a time axis. For example, a line through which data with a frame is transmitted, specifically, an I interface line or a Y interface line. Conventionally, the following methods have been used when a line maintenance operator monitors the use state of this type of line by a user.

The first method is a method of detecting whether or not the logical level of each bit of user data is all 1s, and when the logical level is all 1, some display is performed. Specifically, a plurality of bits (for example, 4096) in the user data
If the number of bits whose logical level is 0 is less than or equal to a predetermined number (e.g., one or less) during the bit), some display is made so that the line maintenance operator can see it. In the data transmission, some meaning may be notified by setting the logical level of each bit of the user data to all 1s. This first method can detect this all 1.

A second method is that, among all bits of a user data write area, at least one bit having a logic level of 1
This is a method of detecting whether or not there is, and if detected, expanding the information by an analog circuit to the extent that the line maintenance operator can see it and displaying it. In normal line use, user data contains at least one logic level 1 bit. Thus, this second method can detect it. In data transmission, some meaning may be notified by setting the logical level of each bit of user data to all 0s. The second method can also detect the all zero.

[0005]

However, the first of the conventional line monitoring methods has a problem that an all-one detection circuit is required.

Further, according to the first method, when the logical levels of all bits of the user data are all 0, or when the user data is data in which the logical level 1 and the logical level 0 are appropriately combined. However, there is a problem that they cannot be detected.

The second of the conventional line monitoring methods is
The method (1) has a problem that a circuit for detecting a bit having a logic level of 1 from user data is required.

Further, in the second method, the circuit for expanding the detected information is an analog circuit. Accordingly, there is a problem that the display state of the line monitor display device tends to vary from device to device because the circuit constant of the analog element is affected by the variation of the circuit constant.

Therefore, it is desired to realize a line monitoring method capable of solving the above problems. It is also desired to realize a line monitoring device suitable for implementing such a line monitoring method.

[0010]

Therefore, according to the invention of the line monitoring method of this application, a line through which data is transmitted in accordance with a transmission standard in which a write area for user data is periodically allocated on a time axis. The usage status of the user
In monitoring, at a predetermined time for each of the write areas,
Detecting a logical level of the line, holding the detected logical level until the predetermined time in the next write area, and monitoring the use state based on the held logical level. .

According to the invention of this line monitoring method, a part of data in the user data writing area (for example, 1-bit data) is held, and the data is replaced with a part of data in the next writing area. Until it is obtained, it can be used as line monitor information (typically, display information on a line monitor display device).

Here, in the case of an I-interface or a Y-interface, which is a kind of international standard interface, when the user transmits all 1 data, all data in the user data writing area of each of a plurality of continuous frames is " 1 ". Therefore, when the user data is all 1, the logical level of the line held at a predetermined time for each of a plurality of continuous user data write areas is "1". Therefore, the display device for the line monitor, during the time corresponding to the plurality of continuous frames,
A first display state, for example, a lighting state is set. Then, even if the length of one frame is short enough that the line maintenance operator (person) cannot recognize it, the above-mentioned plurality of continuous frames are in the lighting state.
Can be visually recognized that this data is being transmitted through the line.

When the user transmits all 0 data, for example, in the above-mentioned I interface, Y interface, etc., all data in the user data writing area of each of a plurality of continuous frames is set to "0". Therefore,
When the user data is all 0s, the logical level of the line held at a predetermined time for each of a plurality of continuous user data write areas becomes “0”. Therefore, the display device for line monitoring is in the second display state, for example, in the light-off state, during the time corresponding to the above-mentioned plurality of continuous frames. Then, even if the length of one frame is so short that the line maintenance operator cannot recognize it, the above-mentioned plurality of continuous frames are turned off. The transmission can be visually recognized.

When the user data is a combination of the logical level "1" and the logical level "0", the data in the user data write area of a plurality of continuous frames are also "1" and "0". Is mixed data. Therefore, the logical level of the line held at a predetermined time for each of the user data write areas of a plurality of continuous frames is 1 or 0 in terms of probability. Therefore, the display device for line monitoring is in a display state in which lighting and extinguishing are mixed during the time corresponding to the plurality of continuous frames. Then, since the line maintenance operator recognizes the flickering of the display, the line maintenance operator can visually recognize that the user data in which “0” and “1” are mixed is transmitted through the line. .

From these facts, according to the invention of the line monitoring method of the present invention, the user data transmitted on the line is all 1s despite the use of some data for each user data writing area. The line maintenance operator can visually monitor whether the state is a state of all 0s, or a state where 1s and 0s are mixed.

Of course, in the case of the present invention, it is only necessary to hold a part of data (typically, data of one bit) for each user data write area. This can be realized by a latch circuit composed of a digital circuit. Therefore, according to the present invention, a conventionally required all-one detection circuit, a circuit for detecting a bit having a logic level of 1 from user data, and an analog circuit for expanding the detected information are provided by:
Can be unnecessary.

Further, according to the invention of the line monitoring device of this application, the use state of the line through which data is transmitted in accordance with the transmission standard in which the user data write area is periodically allocated on the time axis. A latch circuit that captures a logic level of the line at a predetermined time for each of the write areas, and retains the captured logic level until the predetermined time of the next write area; and a latch circuit. And a display device for performing display in accordance with the logical level held by the display device.

According to this line monitoring device, it is possible to easily capture and hold the line level of each writing area at a predetermined time. The display according to the held logic level can be easily performed. Therefore, the invention of the above-described line monitoring method can be easily implemented.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. However,
The drawings used in the description are only schematically shown to the extent that these inventions can be understood. Further, in each of the drawings, the same components are denoted by the same reference numerals, and redundant description may be omitted.

FIG. 1 shows a line monitoring apparatus 10 according to an embodiment.
FIG. 3 is a diagram showing the configuration of FIG. FIG. 2 also shows a line 20 to be monitored.

The line monitor 10 of this embodiment is
1 includes a latch circuit 11 and a display device 13. The line 20 is, for example, a digital line, but is not limited to this, and is, for example, an I interface line or a Y interface line.

The latch circuit 11 latches the logic level of the line 20 at a predetermined time. The data input terminal D of the latch circuit 20 is connected to the line 20 to be monitored.
The output terminal Q of the latch circuit 11 is connected to the display device 13. Further, a control signal (hereinafter, referred to as an enable signal) se for latching the logic level of the line 20 at a predetermined time is input to the G terminal of the latch circuit 11.

The display device 13 performs display according to a signal from the output terminal Q of the latch circuit 11. The display device 13 is not particularly limited, and can be formed of any suitable device.

In FIG. 1, the line 20 and the latch circuit 1
Although an example is shown in which the circuit 1 is directly connected, another circuit may be provided between them for the purpose of improving circuit characteristics and the like. Further, the latch circuit 11 and the display device 13
Also, between them, another circuit may be provided between them as necessary.

Next, an embodiment of the line monitoring method will be described. First, data transmitted through the line 20 and the above-described enable signal will be described.

FIG. 2 shows data DA transmitted on the line 20.
FIG. 3 is a signal waveform diagram illustrating TA and an enable signal Se described above.

The data DATA transmitted on the line 20 is
This is data to be visually monitored by the line monitoring method of the present invention. In this embodiment, data DATA transmitted on the line 20 is assumed to be data divided into frames F as shown in FIG. This is so-called framed data.

Each frame F is composed of, for example, a maintenance signal area, a bit error check signal area, and an area in which user data is written (user data writing area). Of course, the configuration of the frame is not limited to this.

In FIG. 2, the symbol U is attached to the user data writing area. The user data writing area U is periodically allocated on the time axis.

The user data writing area U can be either when it occupies a significant part in the frame or when it occupies only a small part in the frame.
In addition, there is a case where one user data writing area U is allocated in a frame, or a case where user data writing areas of two or more users are multiplexed in a frame (see FIG. 4 described later). obtain.

FIG. 2 shows an example in which the user data writing area U of one user occupies a small portion in the frame.

The enable signal Se is a signal synchronized with the user data write area U of each frame.

In the case of this embodiment, the latch circuit 11
While the logic level of the enable signal Se is “1”,
The data input to the terminal is sent to the display device 13 as it is. Then, the logic level of the enable signal Se is “1”.
When the logic level of the enable signal Se is changed to "1", the data input to the D terminal (that is, the logic level of the line 20) is fetched.
Hold until

The timing at which the logic level of the enable signal Se is changed is such that the logic level of the line at any time in each user data write area U can be latched.
Any timing is possible. That is, the position (timing) in the user data write area at which the logical level of line 20 is latched is not particularly limited.

Although not limited to this, in this embodiment, the enable signal Se is set to "1" level at the time when the user data writing area U is started, At the time of the bit, it is a signal that becomes “0” level.

In the above description, the enable signal S
Although an example in which data is latched at a so-called negative edge of e has been described, a configuration in which data is latched at a so-called positive edge may be adopted.

Next, the line monitor operation will be described in detail. FIG. 3 is an explanatory diagram thereof. FIG. 3 shows a signal waveform obtained by enlarging a part of the data DATA and the enable signal Se shown in FIG.
Circuit 1 depending on the condition of the enable signal Se and enable signal Se.
FIG. 3 is a diagram showing a signal waveform output from a Q terminal of FIG.

When the logic level of the enable signal Se input to the G terminal of the latch circuit 11 is set to "1" (time t1 in FIG. 3), the latch circuit 11 outputs the user data DATA to the output terminal Q as it is.

When the logic level of the enable signal Se changes from "1" to "0" (time t2 in FIG. 3),
The latch circuit 11 latches user data, that is, the logic level of the line 20. In the example of FIG.
2 is “0”, the latch circuit 11
Latch data of "0".

This latched data is kept until the enable signal Se is set to "1" while the logic level of the enable signal Se is "0", that is, in the time zone of the user data write area of the next frame ( (See FIG. 2).

The display device 13 performs display according to the data held by the latch circuit 11. When the logic level of the enable signal Se is “1”, the user data DA
Since TA is directly sent to the output terminal Q, the display device 1
The display state of 3 may change. However, the time during which the logic level of the enable signal Se is "1" is so short that the line maintenance operator (person) cannot recognize it. Therefore, when the logic level of the enable signal Se is “1”, even if the display state of the display device 13 changes, it cannot be recognized by the line maintenance operator.

Here, if the user data of the continuous frames are all data of the logical level "1", the display device 13 displays the display state corresponding to the logical level "1" during the monitoring of these frames. , For example.

When the user data of the continuous frames are all data of the logical level "0", the display device 13 displays the display state corresponding to the logical level "0" during the monitoring of these frames, for example, It turns off.

When the user data of the continuous frames are both data in which the logical level "1" and the logical level "0" are mixed, the display device 13 is turned on while the frames are being monitored. And the light-off state are mixed.

Therefore, according to the present invention, even though only a part of the data of each frame is used, the line maintenance operator determines whether the user data transmitted on the line is all 1 data, Whether the data is 0 or data in which "1" and "0" are mixed can be visually monitored.

Next, another embodiment of the present invention will be described. That is, this is an application example of the present invention in a case where user data write areas of two or more users are multiplexed in each data frame. FIG. 4 is an explanatory diagram for that purpose. This is an application example of the present invention when user data write areas of four users 1 to 4 are multiplexed in each data frame.

In such a case, a latch circuit and a display device are prepared for each of the users 1 to 4, for example. Then, enable signals Se1 to Se4 are input to the latch circuits so as to synchronize with the write areas of the users 1 to 4. In this way, the effects of the present invention can be obtained even for a plurality of users.

[0048]

As is apparent from the above description, according to the invention of the line monitoring method of this application, data is transmitted in accordance with the transmission standard in which the user data write area is periodically allocated on the time axis. In monitoring a line to be performed, at a predetermined time for each of the write areas, a logical level of the line is detected, and the detected logical level is held until the predetermined time of the next write area. The use state is monitored based on the logic level.

Here, the detection and holding of the logical level of the line can be performed by a latch circuit composed of a digital circuit. Therefore, according to the present invention, an all-ones detection circuit, a circuit for detecting a bit having a logic level of 1 from user data, and an analog circuit for expanding the detected information are not required. it can. In spite of using some data for each user data writing area, whether the user data transmitted on the line is in all 1 state or all 0 state, and 1 and 0 are mixed. The line maintenance operator can visually monitor whether the state has been performed.

Since the analog circuit can be eliminated,
The circuit can be digitized, and effects such as easy integration of the circuit in an FPGA (field programmable gate array) can be obtained.

According to the line monitoring device of this application, the invention of the above-described line monitoring method can be easily implemented.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a line monitor device according to an embodiment.

FIG. 2 is an explanatory diagram of the embodiment, illustrating a relationship between a user data write area and an enable signal.

FIG. 3 is an explanatory diagram of the embodiment and is an explanatory diagram of an operation of a line monitoring method.

FIG. 4 is an explanatory diagram of another embodiment, illustrating an application example of the present invention when user data of a plurality of users is multiplexed.

[Explanation of symbols]

 10: Line monitoring device of the embodiment 11: Latch circuit 13: Display device 20: Line to be monitored

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masami Mihara 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. F term (reference) 5K035 AA04 AA07 CC08 EE00 GG14 JJ05 KK04

Claims (4)

[Claims] 1. A method for monitoring a use state by a user of a line through which data is transmitted in accordance with a transmission standard in which a user data write area is periodically allocated on a time axis. Detecting the logical level of the line at the time of, holding the detected logical level until the predetermined time of the next write area, and monitoring the use state based on the held logical level. Line monitoring method. 2. The line monitoring method according to claim 1, wherein said line is an I interface line or a Y interface line. 3. An apparatus for monitoring a user's use state of a line through which data is transmitted in accordance with a transmission standard in which a write area for user data is periodically allocated on a time axis. A latch circuit for fetching the logic level of the line at a predetermined time, and holding the fetched logic level until the predetermined time in the next write area; and a display for displaying the logic level held by the latch circuit. A line monitoring device comprising a device. 4. The line monitoring device according to claim 3, wherein said line monitoring device is a device connected to an I interface line or a Y interface line.