JPH0220192B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to so-called multipoint communication in which communication is performed between a parent terminal (main station) and a plurality of slave terminals (slave stations) using a polling/selecting method in a digital data network. The present invention relates to a branch connection method.

In conventional digital data networks, subscriber terminal speed data is converted into bearer signals in a (6+2) envelope configuration at a residential line termination unit (DSU). This bearer signal transmitted through the subscriber line is terminated at the intra-office circuit terminating unit (OCU), and
It is output to the line editing terminal connection section called CONN. This X-CONN is connected to the input/output lines on the station side of the intra-office line termination section and the input/output lines of the branch connection unit (MJU) that has a branch connection function, and the above mutual connections are made using a connection cable. is going on. The above-mentioned branch connection section will be shown later in the drawings, but it is configured with multiple slave stations as one unit for one master station, and is a unidirectional branch oriented to the master station using the so-called polling/selecting method. It constitutes.

With the above configuration, line editing for point-to-point communication (non-branch line) and multi-point communication (branch line) was conventionally performed using X-CONN in the form of a space division switch, and branch generation was possible only in one direction. When the number of branch lines increases (greater than N), multiple branch connections are connected in cascade, and the main station and slave stations are fixed.

For this reason, in conventional equipment, not only is the configuration complicated, but it is not possible to perform two unidirectional and bidirectional branches between the master station and the slave station using any number of lines for any given line, and the number of branch lines is large. The disadvantage was that the structure became particularly complex as it aged.

Accordingly, an object of the present invention is to provide a branching connection system that enables arbitrary unidirectional and bidirectional branching of master and slave stations with an arbitrary number of lines for an arbitrary line.

According to the present invention, polling and processing are performed between a master station and a slave station in a digital communication network via line editing means.
In the branch connection means for performing selecting type communication, a time division multiplex highway is used as the line editing means, and the main station and slave station
A significant state detection circuit and a speed converter, in which an intra-office line termination section that accommodates data signals to be transmitted and received with the time division multiplex highway determines whether the accommodated data signals are significant and issues a status signal. A means for commonly controlling all of the intra-office line terminals, and managing the time slots of the time division multiplex highway. a time slot generation circuit for accommodating the data signal of which intra-office line termination in the time slot, and an address control memory for storing line setting information as to whether the data signal is a master station or a slave station; A selection circuit that selects a significant status signal in a time-division manner, and a branch circuit that emits the pulse channel only when the status signal generated by the intra-office line termination section of the branch circuit is significant on the inserted line from the slave station to the main station. A branch connection system is obtained, which is characterized in that it includes a common control means having an insertion pulse control means, and a branch line is formed by combining data at an arbitrary speed with an arbitrary number of lines.

Next, a detailed explanation will be given with reference to the drawings.

FIG. 1 shows the connection method (line editing method) between the in-office line termination section and the branch connection section in the conventional system.
4 is the in-office line termination section 1 via X-CONN12
Connected to 3. Note that 14 represents a connection code.

FIG. 2 is a diagram showing in detail a part of an example of the line configuration of the branch connection section set in FIG. The signal from the main station is branched into four by the branch line 19 and sent to the slave stations 1 to 4, that is, the in-office line termination section 13-1.
to 13-4. All significant status signals from slave stations 1 to 4 are sent to the corresponding S bit control circuit 1.
5, it is monitored whether the signal is significant, that is, it is determined whether data communication is in progress, and if it is significant, the corresponding insertion gate 1
6 is opened, and the signal is output to the insertion line 18 via the OR circuit 17 and sent out.

Figure 3 shows the in-office line termination unit 1 that terminates the subscriber line.
3, which includes a subscriber line terminating analog circuit 24 and a subscriber line terminating digital circuit 25.
It consists of.

Figure 4 is a diagram conceptually showing the connection between the master station and slave stations in multipoint communication that can be achieved with the conventional configuration as described above, and is based on the so-called polling/selecting method in which the master station is always fixed. This indicates a one-way branch. In other words, in FIG. 2, only the slave station polled by the master station returns the master station hair answerer and sets the significant state signal in the answer signal to the significant state, thereby achieving insertion by the circuit operation described above. The main hairdresser will be returned.

FIG. 4A is a diagram showing a state in which branch connections are connected in cascade when the number of branch lines increases in a conventional device having the above configuration and characteristics. In this case, the second stage branch connection section 11-2 is provided in place of the slave station 13-1 of the first stage branch connection section 11-1, and a total of seven slave stations are connected. Furthermore, when adding a branch connection section, a branch connection section may be provided in place of the slave station 13-5. same as below. Therefore, as mentioned earlier, the overall structure becomes complicated, and
It was not possible to perform unidirectional and bidirectional branching between the master station and subordinates using any number of lines for any given line.

FIG. 5 is a diagram showing the configuration of a branch connection method when performing polling/selecting method communication according to the present invention, in which the time division multiplex highway 20
, a subscriber line termination section (generally referred to as an in-office line termination section) 21, and a control signal 22 that controls both of them.
Control unit 2 controlled by (22-1 to 22-n)
It consists of 3. Subscriber line termination section 21 is No.1
to No. n, but the numbers include not only the slave stations but also the master station, which is different from the one in Figure 2. No.n+1 at the end of the subscriber line indicated by the chain line
to No. n+n' will be explained later. In addition to the above-mentioned control signals, transmission data and reception data are exchanged between each subscriber line terminal.

FIG. 6 is a diagram showing the configuration of the subscriber line terminating section 21, which includes a subscriber line terminating analog circuit 24 and a subscriber line terminating digital circuit 25.
and a time slot conversion circuit 26 that is controlled by channel pulses CHS and CHR and converts the time slot position where the signal is superimposed on the time-division multiplexed time series, and a time slot conversion circuit 26 that determines whether the signal is significant. , that is, a significant state detection circuit 15 that determines whether data communication is in progress and outputs a significant state signal S. Furthermore, channel pass
CHS, CHR, and output signal S are collectively represented by C.

FIG. 7 is a diagram showing in detail the configuration of the control section 23 shown in FIG.
7, and address control memories 28 and 29 that store line setting information about which intra-office line end signal is to be accommodated in the time slot, and whether the signal is from the main station or slave station if the signal is from a branch line. and,
A selection circuit 30 that time-divisionally selects the significant state signal S sent out from the intra-office line termination section, and a signal from the intra-office line termination section on the line (insertion) from the slave station to the main station of the branch line. A branch line insertion pulse control circuit 31 that generates a channel address if it is significant and inhibits that channel address if it is not significant, and a decoder that decodes the output signal and generates a channel pulse (part of C). It is composed of a circuit 32. Note that 33 is an input terminal for writing line setting information into the address control memories 28 and 29 from the outside.

The operation of the present invention will be explained below using an example.

First, let us assume that the information rate of the signal is m bits/second, and that the speed of the time division multiplex highway is N·m bits/second. Now, the m bits/second information transmitted through the subscriber line is converted into a burst signal at a speed of N·m bits/second by the time slot conversion circuit 26 in the intra-office line termination section 21. Therefore, the number of signals processed on the highway 20 is N. The time slot exchange circuit 26 controls which of the N time slots on the highway should output the first burst signal, or conversely which time slot should the burst signal be taken in. Control channel pulse CHSS/CHR.

Let us now consider one branch line consisting of n intra-office line terminals as shown in FIG. 8, with No. 1 as the master station and Nos. 2 to 2 as slave stations. Therefore, we set the branch and insertion time slots as TSi and TSj (where i≠j).
The functions of the device are divided into a branch function and an insertion function.

FIGS. 9 and 10 are diagrams showing the configuration of the branch function at the time of branching (TSi) and the configuration of the insertion function at the time of insertion (TSj) of the branch line in FIG. 8, respectively.

In Fig. 9, in the case of TSi, channel pulses are sent to the control unit 2 to the CHS because No. 1 is the master station, and to the corresponding CHR since No. 2 to No. n are slave stations.
Distribute from 3. As a result, the signal of No. 1 is changed from No. 2 to
Branched to No.n.

In Fig. 10, if No. 3 is polled at TSj, only No. 3 has a significant signal, and the other No. 2, No. 4 to No. n are in a non-significant state. (Multiple slave stations cannot become significant at the same time.) From the above explanation, for slave stations No. 2 to No. n, only No. 3
Channel pulses are distributed to the CHS from the control unit 23, and at the same time, channel pulses of the CHR are similarly distributed to the No. 1 main station. As a result, only the No. 3 signal is inserted into No. 1.

FIG. 11 is a diagram showing the above situation.

Now, in the above example, No. 1 is the main station and n branch lines are generated, but by updating or switching the contents of the address control memories 28 and 29 in the control unit 23 as necessary, the setting position of the main station can be changed. The number of branches can be changed at any time, and so-called bidirectional branching can also be achieved.

Figure 12 shows No. 1 as an example of the above operation.
3 is a diagram showing a case where No. 3 is the main station and No. 1 is in a significant state. FIG.

In addition, in the same way that TSi and TSj are used to configure one branch line for lines No. 1 to No. n, the same time division multiplex highway is configured using different time slots for multiple lines. A branch line can be configured on 20. This is illustrated by No. n+1 to No. n+n' of the joining line termination portion 21 indicated by chain lines in FIG. It goes without saying that n' may be the same as n.

As described above, according to the present invention, the line editing of the branch line and the one-way branching by the branch/insertion unit 1 were performed in the conventional air division switch format, but by controlling it with the time division switch and address control memory control, it is possible to perform arbitrary branching. It is possible to realize arbitrary unidirectional and bidirectional branching of master and slave stations using any number of lines.

[Brief explanation of drawings]

Figure 1 is a diagram showing a conventional method for connecting an in-office line termination part and a branch connection part, Figure 2 is a diagram showing an example of the line configuration of a branch connection part set in Figure 1, and Figure 3. 4 is a diagram showing an example of the configuration of an in-office line termination section that terminates a subscriber; FIG.
Figure A is a diagram showing the connection state when the number of branch lines increases in the conventional system, Figure 5 is a diagram showing an example of the configuration of the branch connection system of the present invention, and Figure 6 is a diagram showing the connection state when the number of branch lines increases in the conventional system. FIG. 7 is a diagram showing an example of the configuration of the termination section, FIG. 7 is a diagram showing in detail the configuration of the control section in FIG. 5, and FIG. 8 is a diagram showing one branch line composed of n intra-office line termination sections. Figure 9 is a diagram showing the configuration of the branch function when branching the branch circuit in Figure 8, Figure 10 is a diagram showing the configuration of the insertion function when the branch circuit in Figure 8 is inserted, Figure 11 The figure shows the state of channel pulse distribution when a branch circuit is inserted.
The figure shows the state of channel pulse distribution in bidirectional branching. Explanation of symbols: 11 is branch connection, 12 is X-
CONN, 13 is an in-office line termination section, 14 is a connection code, 20 is a time division multiplex highway, 21 is a subscriber line termination section, 22 is a control signal, 23 is a control section, 2
4 is an analog circuit for subscriber line termination, 25 is a digital circuit for subscriber line termination, 26 is a time slot conversion circuit, 27 is a time slot generation circuit, and 28 is a time slot generation circuit.
Reference numeral 29 represents an address control memory for CHS, numeral 29 represents an address control memory for CHR, numeral 30 represents a selection circuit, numeral 31 represents a branch line insertion pulse control circuit, and numeral 32 represents a decoding circuit.

Claims (1)

[Scope of Claims] 1. In a branch connection means for performing polling/selecting communication between a master station and a slave station in a digital communication network via a line editing means, a time division multiplex highway is used as the line editing means. , intra-office line termination units of the master station and the slave station that accommodate data signals to be transmitted and received with the time division multiplex highway determine whether the accommodated data signals are significant and send a status signal. It is equipped with a time slot conversion circuit that is controlled by channel pulses and is made up of a significant state detection circuit that generates a signal and a memory that has a speed conversion function, and
Means for commonly controlling all of the intra-office line terminals, which includes a time slot generation circuit for managing the time slots of the time division multiplex highway, and a means for determining which intra-office line terminal section's data signal is accommodated in the time slot. an address control memory that stores line setting information on whether the data signal is a master station or a slave station;
A selection circuit that time-divisionally selects a significant status signal emitted by the intra-office line termination section, and only when the status signal emitted by the intra-office line termination section is significant in the inserted line from the slave station to the main station of the branch circuit. A branch connection system comprising a common control means having a branch circuit insertion pulse control means for emitting the pulse channel, and a branch line is configured by combining data of an arbitrary speed with an arbitrary number of lines. 2. The branch connection system according to claim 1, wherein the branch circuit is a plurality of branch circuits provided on the same time division multiplex data highway.