JPH042231A - System for maintaining subscriber radio system - Google Patents

Abstract

PURPOSE:To eliminate the need for a troublesome procedure or lease of a line, etc., by allowing a subscriber side line terminal equipment to detect non-start of a terminal equipment, to set a loopback path according to a test item from a base station stored in a storage circuit, conducting the maintenance test through the transmission of a test signal and storing the result to the storage circuit. CONSTITUTION:A subscriber side line terminator 2 is provided with a 1st means forming a loopback path for a test signal, an end means generating and detecting the test signal, a 3rd means controlling the maintenance and test, and a 4th means conducting the test. Then the non-start state of a terminal equipment 3 is detected to set sequentially a loopback path according to the test item from a base station stored in a storage circuit 110 and to pass the test signal, thereby conducting the maintenance and test and the result is stored in the storage circuit 110. Thus, the non-start state of a terminal equipment is automatically detected and the test is executed by having only to enter test items from a remote controller of a base station without the lease of a line or the like after the investigation of the schedule of the utilization of line by users in advance. Thus, the procedure is simplified and the line maintenance cost is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a maintenance method for a subscriber radio system, and more particularly to a maintenance method in which maintenance tests are automatically performed according to requirements from a maintenance station.

[Conventional technology]

In conventional subscriber wireless systems, when performing a maintenance test on a subscriber's terminal, the maintenance person first checks when the user's terminal is not in use, and then connects the line to the test circuit when the user's terminal is not in use and performs the test. It was common to do so.

[Problem to be solved by the invention]

Therefore, it is necessary to investigate the user's line usage schedule in advance, which becomes extremely troublesome. Additionally, in many cases, users who are engaged in resale, etc. plan to use the line constantly throughout the year, and for maintenance tests, they have to ask users to borrow the line before conducting the test, which is a cumbersome procedure. At the same time, there was also the problem of having to refund the line usage fees at the time of borrowing.

An object of the present invention is to provide a maintenance method that eliminates the need for such troublesome procedures and also eliminates the need for line borrowing.

[Means to solve the problem]

The maintenance method of the present invention includes a terminal interface section that performs level conversion, code conversion, etc. of signals with the terminal, and a terminal interface section that performs multiplexing and demultiplexing of terminal signals and auxiliary signals in a subscriber-side line termination device connected to a subscriber terminal. A signal processing unit that performs signal processing as a wireless frame, and a modulation/demodulation unit that has an interface with the wireless transmitting/receiving device such as modulation/demodulation of transmission signals, superimposition of alarms and power supply, etc. a second means for generating and detecting a test signal;
A third means for controlling the maintenance test and a fourth means for executing the test are provided.

That is, as a means for configuring the first return route,
At the input and output points of the terminal interface section, the signal processing section, and the modulation/demodulation section, return circuits are provided for returning signals toward the terminal and toward the radio, respectively.

Further, as means for generating and detecting the second test signal, the terminal connection side includes a first test signal generation detection circuit that operates as a pseudo terminal and a first switch for switching the test signal with a signal from the terminal. A second test signal generation/detection circuit operating as a pseudo radio device and a second switch for switching the test signal to a signal from the radio device are provided on the radio device side.

Further, as a means for controlling the third maintenance test, a test item detection circuit that detects a test item command from a base station monitoring and control device from a signal from the base station, and a test item detection circuit that detects a test item command from a base station monitoring and control device, and a detected item and the test signal generation A storage circuit for storing test results of detection circuits 1 and 2 is provided.

Further, as a fourth test execution means, a terminal activation detection circuit is provided to detect an activation bit in the terminal signal.

[Effect]

According to the present invention, the subscriber side line termination device detects when the terminal is not activated, sequentially sets return routes according to the test items from the base station stored in the storage circuit, and passes the test signal. This allows maintenance tests to be performed and the results to be stored in a memory circuit.

〔Example〕

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

FIG. 2 is a block diagram of a subscriber radio system to which an embodiment of the present invention is applied. The subscriber side is composed of a subscriber wireless transmitting/receiving device 1, a subscriber side line termination device 2, and a plurality of terminals 3. The subscriber side line termination device 2 has a plurality of terminals 3
It has line termination functions such as demultiplexing and demultiplexing these signals and monitoring alarm and status signals, as well as a transmission signal modulation and demodulation function for sending the signals to the opposite station via a wireless transmission path.

On the other hand, the base station side is similarly composed of a base station side wireless transmission/reception bag W4, a base station side line termination device 5 connected to the relay network, and a monitoring control device 6 that controls maintenance tests.

The subscriber radio system shown in Figure 2 is based on the CCITT recommendation.
When applied to the 5DN reference model, N T in Figure 3
Corresponds to I and LT. In other words, the subscriber side is NTI,
The base station side is LT. Further, the terminal 3 corresponds to NT2, and the number of input/output points to the relay network on the base station side corresponds to seven points. The wireless transmission section corresponds to point U.

Here, the reason why the subscriber-side line termination device 2 can detect the activation state of the terminal 3 will be explained using an example.

According to FIG. 3, the interface point between the two is point T.

Only a limited interface exists at this T point due to CCTT's ■ series recommendations.

One example is the interface shown in Figure 4, which is called the "basic interface (or basic access)" and has a capacity of 64K.
Two signal channels called B signal with a capacity of bps and one signal called D signal with a capacity of 16Kbps.
This is an interface with a total channel capacity of 2B+D. In reality, various additional bits are added as shown in the figure, and the interface speed is 19
The speed is 2Kbps.

In this frame structure, the active state of the terminal is TE-NT.
This can be determined by inspecting the F bit (framing bit) and D bit of the frame.

Another example is shown in Figure 5, which is an interface called the "primary group interface (primary access)" which has a higher capacity than the basic interface and has a capacity of 1.544 Kbps (equivalent to 24 B channels). be. In this case, the activation state of the terminal can be determined by checking the AI bit (activation indication bit) arranged in a multi-frame manner in the F bit added to the beginning of the frame.

The interface conditions in the above example exist between the terminal and the subscriber-side line termination device.

Now, FIG. 1 shows details of the subscriber side line termination device 2 in this embodiment. Note that here, the terminal 3 is connected to N terminals 3. ~3.4 shall be connected.

As shown in the figure, the subscriber side line termination device 2 includes a terminal interface unit 101 that performs level conversion and code conversion of signals with the terminal, and a terminal interface unit 101 that is connected to it and demultiplexes terminal signals and auxiliary signals and converts them into radio frames. The main components are a signal processing unit 102 that performs signal processing, and a modulation/demodulation unit 103 connected to the signal processing unit 102 and having an interface with a wireless transmitting/receiving device such as modulation/demodulation of transmission signals, superimposition of alarms and power supplies, etc.

Furthermore, first to fourth means are provided as testing means.

The first means is means for configuring a return route. The terminal interface section 101. At the input point and output point of the signal processing section 102 and the modulation/demodulation section 103, a folding circuit is provided for folding back the signal in the direction of the terminal 3 and the direction of the wireless transmitting/receiving device 1, respectively.
, D, E, and F are a, b in the direction of the wireless transmitter/receiver.
,c.

Paths d, e, and f are configured under the control of the test signal and the loopback control circuit 104, respectively.

The second means is means for generating and detecting a test signal. The terminal connection side is provided with a first test signal generation and detection circuit 105 that operates as a pseudo terminal, and a first switch 106 for switching the test signal with a signal from the terminal. A second test signal generation and detection circuit 107 that operates as a pseudo radio device and a second switch 108 for switching the test signal with a signal from the radio device are arranged,
It is possible to switch between the transmission signal and the test signal.

The third means is maintenance test control means. A test item detection circuit 109 that detects test item commands from the base station monitoring and control device from signals from the base station, and a storage circuit that stores the detected items and test results of the test signal generation detection circuits 105 and 107. 110 is provided.

The fourth means is a test execution means. The maintenance test is executed based on the activation state of the terminal detected by the terminal activation detection circuit 111 which detects the activation bit in the terminal signal.

Therefore, in this subscriber radio system, by appropriately using the first to fourth means provided in the subscriber side line termination device 2, it is possible to detect when the terminal 3 is not activated, and to store the information in the storage circuit 110. This can be achieved by sequentially setting loopback routes according to test items from base stations, performing maintenance tests by passing test signals, and storing the results in the storage circuit 110.

〔Effect of the invention〕

As explained above, the present invention provides the first to fourth means in the subscriber side line termination device, detects when the terminal is not activated by these means, and receives the test from the base station stored in the storage circuit. A maintenance test is performed by sequentially setting return routes according to the items and passing test signals, and the results are stored in the memory circuit, so the user's line usage schedule can be investigated in advance or line borrowing etc. Even if you do not have one, just by inputting the test items from the base station's monitoring and control device, you can automatically detect when the terminal is not activated and execute the test, simplifying procedures and reducing line maintenance costs. It has a big effect.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a subscriber-side line termination device according to an embodiment of the present invention, FIG. 2 is a block diagram of a subscriber radio system to which the present invention is applied, and FIG. 3 is a block diagram showing the configuration of a subscriber-side line termination device according to an embodiment of the present invention. CCITT Recommendations corresponding to subscriber radio systems
5DN reference model diagram, Figure 4 is the signal frame format of the l5DN basic interface, Figure 5 is the l5DN-
This is the signal frame format of the next group interface. l...Subscriber side wireless transmitting/receiving device, 2...Subscriber side line termination device, 3, 3. ~3N...Terminal, 4...Base station side radio transmitting/receiving device, O...Base station side line termination device, 6
. . . Monitoring control device, i o i-. Terminal interface section, 102 . . . Signal processing section, 103 . . . Modulation/demodulation section, 104 .
5... First test signal generation circuit, 106... First switch, 107... Second test signal generation circuit, 108
. . . second switch, 109 . . . test item detection circuit,
110...Storage circuit, 111...Terminal activation detection circuit. Engraving of the drawings (no change in content) Procedural owner's official document (method) % formula % Display of the case 1990 Patent Application No. 103423 2゜ Title of the invention Related Patent Applicant Name NEC Corporation 4゜ Agent Address 103 Nagatani Building, 3-1-6 Nihonbashi Honmachi, Chuo-ku, Tokyo
No. 907 5゜ Date of amendment order July 31, 1990 0 ms 1111 7゜ Contents of the amendment Submit Figures 4 and 5, which are drawn appropriately (no changes to the contents).

Claims (1)

[Scope of Claims] 1. A subscriber side consisting of a plurality of terminals, a subscriber-side line terminating device for terminating a terminal line, and a subscriber-side wireless transmitting/receiving device as a transmission means; The base station side is installed facing each other and consists of a base station side radio transmitter/receiver, a base station side line termination device that terminates terminal signals on the base station side, and a supervisory control device that controls alarm monitoring and various maintenance tests. In the subscriber radio system, the subscriber side line termination device includes a terminal interface unit that performs level conversion and code conversion of signals with the terminal, and a terminal interface unit that performs level conversion and code conversion of signals with the terminal, and a radio frame that demultiplexes terminal signals and auxiliary signals. a signal processing unit that performs signal processing as a test device; and a modulation and demodulation unit that has an interface with a wireless transmitting/receiving device such as modulation and demodulation of transmission signals, superimposition of alarms and power supplies, and as a test means, a first means for configuring a loopback route. A maintenance method for a subscriber radio system, comprising: a second means for generating and detecting a test signal; a third means for controlling a maintenance test; and a fourth means for executing the test. 2. As a means for configuring the first return route, a return circuit is provided for returning the signal in the direction of the terminal and in the direction of the radio at the input point and output point of the terminal interface section, the signal processing section, and the modulation/demodulation section, respectively; As a means for generating and detecting the second test signal, the terminal connection side includes:
A first test signal generation detection circuit that operates as a pseudo terminal, a first switch for switching the test signal with a signal from the terminal, and a second test signal that operates as a pseudo radio device on the radio device side. It is equipped with a second switch for switching the occurrence detection circuit and its test signal with the signal from the radio, and as a means for controlling the third maintenance test, it receives commands for test items from the base station monitoring and control device. The terminal is equipped with a test item detection circuit for detecting from a signal from a base station, and a storage circuit for storing the detected items and the test results of the test signal generation detection circuits 1 and 2, and as a fourth test execution means, the terminal A maintenance method for a subscriber radio system according to claim 1, further comprising a terminal activation detection circuit for detecting an activation bit in a signal.