JPH0683208B2 - Master station device for time division multiplex multiplex communication system - Google Patents

Description

The present invention relates to a master station device for a time division multi-directional multiplex communication system,
In particular, the present invention relates to a time-division multi-direction multiple communication system master station device capable of detecting a failure in the master station.

[Prior Art] FIG. 3 is a system configuration diagram of an example of a time division multi-directional multiplex communication system to which the present invention is applied. In this system, a master station multi-directionalizes a time division signal multiplexed to each slave station. To the slave station, each slave station synchronizes with the signal sent from the master station and regenerates the timing signal, thereby extracting the signal allocated to itself. The time T _a slave station is assigned to each slave station based on the above-mentioned timing signal,
T _b, ..., and sends only the signal T _n, the signal sent from each slave station in the master station a, b, ... n are controlled so as to be arranged in sequence on the time axis as the signal S in FIG. . F in the figure indicates one frame of the signal S, and T _a , T _b ... T _n indicate the time allocated to each slave station within one frame. The P _b is a signal polling channels for management control by polling scheme slave stations from the master station, is used in common to each slave station. As an example, this figure shows a case where the slave station b is polled by the master station. Further, T _b indicates the time to which the signal P _b of the polling channel is assigned.

[Problems to be solved by the invention]

In the time division multi-directional multiplex communication system as shown in FIG. 3 described above, since all communication is performed via the master station, the failure of the master station causes a failure of the entire system. Therefore, raising the reliability of the master station is an important issue. One possible solution to this problem is to configure the master station device with the active device and the standby device. However, when the active device of the master station fails, the active device is effectively switched to the standby device. It is an important issue to detect the failure of the master station device within the master station.

The present invention solves such a problem and makes it possible to detect a fault occurring in the master station device in the local device.

[Means for solving problems]

According to the present invention, it is configured by one master station and a plurality of slave stations, and in the signal train of the transmission line between the master station and the plurality of slave stations, each slave station is polled by the master station. In a time-division multi-directional multiplex communication system with a polling channel for management and control by a master station, a supervisory signal generating circuit that generates a supervisory signal in the master station for monitoring the inside of the master station and the master station sends the signal to each slave station. The first time of time-division multiplexing of the master station supervisory signals output from the supervisory signal generation circuit to the master station supervisory time slots of N (M and N are positive integers) every M polling cycles of the polling channel. A division multiplexing circuit, a transmission signal processing circuit that performs transmission signal processing of the signal output from the first time division multiplexing circuit, and a monitoring signal in the master station that is time division multiplexed to the output signal of the transmission signal processing circuit Sent from each slave station A second time division multiplexing circuit for coming signal demultiplexed in the column was, a reception signal processing circuit for receiving signal processing of the signal output from the second time-division multiplexer,
A monitoring circuit for monitoring a monitoring signal in the master station that is time-division multiplexed with the output signal of the reception signal processing circuit, and a time division multiplexing by the first time division multiplexing circuit based on the output signal from the reception signal processing circuit A master station device for a time division multi-directional multiplex communication system including a polling control circuit for controlling the demultiplexing by the second time division multiplexing circuit is obtained.

〔Example〕

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

FIG. 1 is a block diagram showing an embodiment of a master station apparatus when the master station apparatus for time division multiplex multiplex communication system according to the present invention is applied to the time division multiplex multiplex communication system as shown in FIG. First
In the figure, 10 is a supervisory signal generating circuit that generates a signal for monitoring in the master station, 20 is a supervisory signal in the master station that is output from the supervisory signal generating circuit 10, and is a timing signal for monitoring in the master station that is output from the polling control circuit 50. Is a time division multiplexing circuit that time division multiplexes the input signal sent from the master station to the slave station. Reference numeral 30 is a time division multiplex that time-division multiplexes the polling information output from the polling control circuit 50 with the signal output from the time division multiplexing circuit 20 in accordance with the polling timing signal output from the polling control circuit 50. Circuit. Reference numeral 40 denotes a transmission signal processing circuit that performs transmission signal processing such as scrambling on the signal output from the time division multiplexing circuit 30, and the transmission signal output from this transmission signal processing circuit 40 is sent to the slave station.

Reference numeral 60 denotes a monitoring signal in the master station which is time-division multiplexed with the transmission signal output from the transmission signal processing circuit 40, and is sent from the slave station in accordance with the monitoring timing signal in the master station output from the polling control circuit 50. It is a time division multiplexing circuit for demultiplexing the received signal. Reference numeral 70 denotes a reception signal processing circuit that performs reception signal processing such as descramble on the signal output from the time division multiplexing circuit 60 and outputs the output signal.

Reference numeral 80 denotes a monitoring circuit for monitoring the master station internal monitoring signal time-division-multiplexed with the output signal output from the reception signal processing circuit 70 in accordance with the master station internal monitoring timing signal output from the polling control circuit 50. Reference numeral 50 is a polling control circuit, which uses a time division multiplexing circuit 20
And 60 and the monitoring circuit 80 to output the polling timing signal and the polling information to the time division multiplexing circuit 30, and the time division multiplexing to the output signal output from the reception signal processing circuit 70. This circuit receives the polling information sent from the slave stations and manages and controls each slave station.

FIG. 2 is a time chart showing an example of signals of the respective parts in FIG. In the figure, (a) shows the input signal of FIG. 1, and (b) shows the monitoring signal T in the master station output from the monitoring signal generation circuit 10. (C) is polling information output from the polling control circuit 50. Pa indicates a polling signal for the slave station a, Pn indicates a polling signal for the slave station n, and each polling signal contains the number of each slave station and management control information. Etc. are included.
(D) shows a transmission signal output from the transmission signal processing circuit 40, and this signal is sent to the slave station. Incidentally, since the station number designating the slave station is not inserted in the monitoring signal T in the master station inserted in the polling channel Tp of the transmission signal of (d), it is ignored in each slave station.

In addition, (e) shows the transmission signal sent from each slave station,
In (f), the intra-master station monitoring signal T, which is time-division multiplexed in the time-division multiplexing circuit 60 with the transmission signal (d), is demultiplexed into the reception signal (e), and the reception signal processing is performed in the transmission signal processing circuit 70. Shows the output signal that is output. Note that Pa and Pn in the output signal (f) are response signals to the polling information Pa and Pn sent from the master station to the slave station in the polling information (c) and the transmission signal (d). Further, in FIG. 2, F indicates one frame, PC indicates one polling period, and a,
, N indicate call signals and the like transmitted and received between the respective slave stations a, ..., N and the master station. FIG. 2 shows an example in which one monitoring time slot for monitoring in the master station is provided for each polling cycle.

As is clear from the description of FIGS. 1 and 2,
In the master station device shown in FIG. 1, the supervisory signal generation circuit 10
The monitoring signal in the master station (Fig. 2 (b)) output from the master station is input to the time division multiplexing circuit 20 according to the timing signal for monitoring in the master station output from the polling control circuit 50 (Fig. a)) is time-division multiplexed, and this multiplexed signal is
The time-division multiplexing circuit 30 multiplexes the polling information (FIG. 2 (c)) output from the polling control circuit 50,
The transmission signal processing circuit 40 performs transmission signal processing such as scrambling, and outputs as a transmission signal (FIG. 2 (d)).

Furthermore, in the time division multiplexing circuit 60, the monitoring signal in the master station (T in FIG. 2 (d)) time-division multiplexed with the transmission signal output from the transmission signal processing circuit 40 is the polling control circuit.
Received signal sent from each slave station according to the monitoring timing signal in the master station output from 50 (Fig. 2 (e))
Are demultiplexed and multiplexed, and the received signal processing circuit 70 performs received signal processing for descramble and the like, outputs as an output signal (Fig. 2 (f)), and outputs from the polling control circuit 50 in the monitoring circuit 80. The presence / absence of a fault is monitored according to the monitoring timing signal in the master station.

Therefore, when a failure occurs in the supervisory signal generation circuit 10, the time division multiplexing circuits 20, 30, 60, the transmission signal processing circuit 40, and the reception signal processing circuit 70 in the master station device of FIG. circuit
The monitoring signal in the master station that is time-division-multiplexed with the output signal output from 70 becomes abnormal, and as a result, the monitoring circuit 80 can detect a failure in the master station device.

In the above explanation, 1 is set for the polling channel.
The case has been described in which one time slot for monitoring in the master station is provided for each polling cycle, but N (M and N are positive integers) time slots for monitoring in the master station are provided for each M polling cycles in the polling channel. It is apparent from the above description that the present invention can be applied to the case where it is provided.

〔The invention's effect〕

As described above, the master station device for the time division multi-directional multiplex communication system according to the present invention uses the time slot of the polling channel to flow the master station monitoring signal and monitor the signal, thereby It is possible to reliably detect the fault that has occurred in step 1 in the local station device, and it is possible to reliably switch from the active device to the standby device when the primary device has a fault in the active device. Further, since the time slot of the polling channel is used to monitor the inside of the own station, it is not necessary to provide an extra time slot for monitoring the master station, and therefore, there is an effect that efficient monitoring can be performed.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a master station device for time division multi-directional multiplex communication system according to the present invention, FIG. 2 is a time chart showing an example of signals of respective parts of FIG. 1, and FIG. FIG. 3 is a system configuration diagram showing an example of a time division multi-directional multiplex communication system to which is applied. 10: supervisory signal generation circuit, 20, 30: time division multiplexing circuit, 40: transmission signal processing circuit, 50: polling control circuit, 60: time division multiplexing circuit, 70: reception signal processing circuit, 80: supervisory circuit.

 ─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-58-202641 (JP, A) JP-A-60-251735 (JP, A) JP-A-59-99833 (JP, A)

Claims (1)

[Claims] 1. A master station and a plurality of slave stations, each of which is constituted by one master station and a plurality of slave stations. The master station and each slave station are polled by a polling method in a signal line of a transmission line between the master station and the plurality of slave stations. In a time division multi-directional multiplex communication system having a polling channel for management control, a supervisory signal generating circuit for producing a supervisory signal in the master station for monitoring the inside of the master station, and a signal sent from the master station to each slave station A time division multiplex of the monitoring signal in the master station output from the monitoring signal generating circuit to N (M and N are positive integers) monitoring time slots in the master station every M polling cycles of the polling channel. No. 1 time division multiplexing circuit, a transmission signal processing circuit for performing transmission signal processing of the signal output from the first time division multiplexing circuit, and time division multiplexing for the output signal of the transmission signal processing circuit Monitoring in the parent station Second time division multiplexing circuit for demultiplexing the signal into the signal sequence sent from each slave station, and reception for performing reception signal processing of the signal output from the second time division multiplexing circuit A signal processing circuit, a monitoring circuit for monitoring the master station internal monitoring signal time-division multiplexed with the output signal of the reception signal processing circuit, and the first time based on the output signal from the reception signal processing circuit A master station apparatus for a time division multi-directional multiplex communication system, comprising a polling control circuit for controlling time division multiplexing by a division multiplexing circuit and separation multiplexing by the second time division multiplexing circuit.