JPH0659061B2 - Branching transmission method for multiplexed signals - Google Patents

Description

The present invention relates to a main station including a digital time division multiplexer connected to a high-speed digital line, and a branch connection device provided in the middle of the high-speed digital line. The present invention relates to a branch relay transmission system for transmitting / receiving a digital time division signal between slave stations including a digital time division multiplexing device connected via a line.

[Conventional technology]

There is a branch service as a high-speed digital line service provided by NTT (Nippon Telegraph and Telephone Corporation).

This branch service installs a branch connection device in the middle of the high-speed digital line to branch the transmission signal from the high-speed digital signal transceiver station M1 station to the M3 station to the M2 station located in the middle of the M1 and M3 stations, or the M2 station. To M1 station and M
Signals to three stations are newly inserted.
This service, that is, the function of the branch connection device, includes one that can perform only one-way branch and one that can perform two-way branch.

FIG. 7 shows an example of this type of branch service. There are four high-speed digital signal transmission / reception stations in which digital multiplexers 1 to 4 are installed, and the main station is a station having a function of managing the whole. Temporarily M1 and others (M2-M4)
It is shown that in the system in which the two-way branch connection devices 5 and 6 are installed in the middle of the transmission path 10 between M1 and M4. The bidirectional branch connection devices 5 and 6 will be described.

FIG. 8 is a functional block diagram of the two-way branch connection devices 5 and 6 shown in FIG.

5 will be described.

In the figure, 51 and 52 are input and output terminals of the A route, 53 and 5
Reference numeral 4 denotes an input and output terminal of the B route, and 55 and 56 denote input and output terminals of the C route. In this case, the A, B, and C routes respectively represent the M1 station direction, the M4 station direction, and the M2 station direction for the two-way branch connection device 5 in FIG.

Reference numerals 57 to 59 are AND gates. The operation of the bidirectional branch connection device 5 will be described. The signal transmitted from the M1 station enters the A route input terminal IN-A51, is branched on the way, and is input to the AND gates 57 and 59.
The signal from the M4 station is received by the B route input terminal IN-B53 and added to the AND gate 59, so when it is "1", the C route output terminal OUT-C56 is connected to the A route input terminal IN. -When the A51 input is output as it is, it is "0" when it is "0".

The output of the B-route output terminal OUT-B54 is similarly dominated by the input signal of the C-route input terminal IN-C55. Therefore, when such a bidirectional branch connection device is provided in the middle of a line, it is said that channel allocation of transmission signals and transmission / reception status are as follows.

9 (a) and 9 (b) show a master station (M1) and slave stations (M2, M).
3, M4) shows the status of channel allocation and transmission / reception of signals. The number of signal paths required for each route is 4C2 = 6 sets, and specifically, M1M2, M1M3, M1M
4, M2M3, M2M4, M3M4. The arrows represent signal transmission in both directions, going up and down. Therefore, the transmission signal transmitted / received between the master station and the slave station becomes a time division multiplexed signal of at least 6 channels, for example, channel 1 (CH1).
To M1M2 route, channel 2 (CH2) to M1M3 route, channel 3 (CH3) to M1M4 route, channel 4 (CH4) to M2M3 route, channel 5 (CH5) to M2M4 The channel 6 (CH6) is assigned to the M3M4 route. In this example, only one CH is used for each route, but it is natural that two CHs can be used when the amount of data is large.

Here, as shown in FIG. 9 (a), data A is assigned to the assigned channel.
~ L, enter all “1” in the hatched CH,
At each station? If you ignore the marked CH,
Reception is performed as shown in FIGS.

As a digital multiplexer capable of performing branch relay transmission as shown in FIGS. 9 (a) and 9 (b), transmission control is performed so that the transmission signal is data or all "1" corresponding to each channel. However, since it can be realized by controlling the reception so as to receive or ignore the received signal, a device as shown in FIG. 10 is conceivable.

In FIG. 10, a multiplexing control circuit 100 controls the transmission frame structure. 104 is an address control memory (A
CM ... Same as below), 105 is a transmission line interface circuit, 106 is an address bus, 107 is a transmission bus for carrying transmission data, 108 is a reception bus for carrying reception data, 1
Reference numeral 09 represents a transmission control signal, and 110 represents a reception control signal. The transmission control signal 109 controls the transmission signal of the corresponding CH from the multiplexing control circuit. When the transmission control signal 109 is "0", the data from the terminal device is set, and when the transmission control signal 109 is "1", the corresponding CH is all "1".
The reception control signal 110 also controls the reception signal. When it is "1", it ignores reception, that is, does not output, and when it is "0", it outputs reception output normally.

Reference numerals 111-1 to n are 0th-order TDMs, which multiplex low-speed data from a terminal device (not shown) and connect the multiplexed data to a transmission bus. Alternatively, it is assumed that a device for demultiplexing the received data from the receiving bus and passing the data to the terminal device is provided corresponding to the number of CHs.

Description will be given below by taking 111-1 as an example.

An address decoder 112-1 determines whether or not its own device is selected by a signal on the address bus. When the address signal matches with its own device, it outputs the signal and opens the next stage 113-1 transmission gate and 114-1 reception gate. 115-1
Is a transmission speed conversion circuit, 116-1 is a NAND, 117-
1 is OR, 118-1 is AND, 119-1 is NAND
Each gate of is shown. 120-1 is a reception buffer memory,
121-1 is a multiplexing circuit that multiplexes bearer rate low speed data from a terminal device (not shown) to a speed of 64 Kb / s, 122-1 is a demultiplexing device, 123-1 is all “1” for the CH. An all "1" code generator for generating a "code" is shown.

FIG. 11 is an example of a transmission signal of the apparatus shown in FIG. 10 and is for explaining the details of FIG.

Next, the operation of the apparatus shown in FIG. 10 will be described with reference to FIG.

(A) About MDM station TDM1 Address decoder 1 in 0th-order TDM-1 (111-1)
12-1 receives the address data on the address bus 106, and outputs it when it matches the address of its own device, thereby transmitting gate 113-1 and receiving gate 114-1.
open.

(Transmission operation) Low-speed data from the terminal device (not shown) is multiplexed at the speed of 64 Kb / s by the multiplexing circuit 121-1 (this is referred to as data A), and the data is sent to the NAND gate 119-1. Is entered.

Since the NAND gate 119-1 opens when the transmission control signal 109 from the multiplexing control circuit 100 is "0", the data A passes through the OR gate 117-1 and the transmission speed conversion circuit 11
It is input to 5-1. Here, the speed of 64 Kb / s is converted to the speed of the high-speed digital line 10, and the transmission gate 11
It is output to the transmission bus 107 via 3-1 and sent to the line 10 via the transmission line interface circuit 105.

Next, since the address shifts to CH2, the address decoder 11
2-2 matches the own device, and the 0th-order TDM 111-2 sends the data B to the transmission bus 107. Similarly, 0th order TD
M111-3 sends data C on CH3.

In the 0th-order TDM 111-4, the transmission control signal 109 from the multiplexing control circuit 101 is set to "1".
The gate 119-4 is closed, the AND gate 118-4 is opened, and the output of the all "1" encoding circuit 123-4 is OR117.
Is input to the transmission speed conversion circuit 115-4 via -4.
Similarly, all "1" is placed on CH4 and transmitted. The same applies to CH5 and CH6.

(Reception Operation) The reception gate 114-1 of the 0th-order TDM 111-1 is opened and the reception data is received from the reception bus 108 by the NAND gate 116-.
Input to 1. Since the reception control signal 110 from the multiplexing control circuit 100 is "0", the reception signal CH1 (data G) coming via BU5 is fetched and input to the reception buffer memory 120-1. The data G of CH1 is demultiplexed into low-speed data by the demultiplexing circuit 122-1 and sent to the terminal device. Similarly, the data H is CH2 in the 0th-order TDM 111-2, and the CH is CH in the 0th-order TDM 111-3.
At 3, the data 1 is received respectively. However, in the 0th-order TDM 111-4, the reception control signal 110 from the multiplexing control circuit 100 becomes "1".
16-4 does not open and the CH4 reception signal is not received. That is, the received signal is ignored. Similarly, 0th-order TDM114-
In 5 and 114-6, since the reception control signal 110 is "1", all the CH5 and CH6 reception signals are ignored.

(B) Regarding MDM station TDM2 (Transmission operation) The transmission control signal 109 of the multiplexing control circuit 100 of the M2 station TDM2 is set to 0, 1, 1, 0, corresponding to CH1 to CH6.
If 0 and 1 are set, 0th-order TDM 111-1 to 11
From each 1-6, data G, which corresponds to CH1-CH6,
all “1”, all “1”, data D, data E, all
“1” is sent to the line 10. This signal is BU1 (5)
When it goes through, the AND gates 57 and 58 produce signals as shown at the output terminals 54 and 52.

(Reception Operation) The reception control signal 110 of the multiplexing control circuit 100 of the M2 station TDM2 is set to 0, 1, 1, 0, corresponding to CH1 to CH6.
If set to 1, 1, 0-order TDM 111-1 to 11
From each of 1-6, data A, ignore, ignore, data J, data K, ignore, data A from station M1, data J from station M3, data K from station M4 are received.

Hereinafter, similarly, the transmission control signal 109 and the reception control signal 1 set in advance for the M3 station TDM3 and the M4 station TDM4 are also set.
According to 10, the transmission signal and the reception signal are transmitted or received. The transmission control signal 109 and the reception control signal 110 from the multiplexing control circuit 100 of each TDM are set with fixed routes.

In this way, the time-division-multiplexed signal is dropped or inserted at each branch point, and data is sent to each slave station.
It can also receive data from slave stations.

[Problems to be solved by the invention]

The conventional branch transmission system is configured as described above, and one route is assigned to each channel and fixed. For this reason, the transmission capacity of each route is fixed. For example, at night, when viewed from each slave station, the upward direction, that is, M2 →
It has not been possible to flexibly meet the demand for increasing the amount of data in the directions of M1, M3 → M1, M4 → M1.

The present invention has been made to solve the above-mentioned problems, and can flexibly deal with the data amount of a route that changes depending on the time of day or time of day while maintaining the principle of constant-speed branching in the branch connection device. The purpose is to obtain a branch transmission system.

[Means for solving problems]

Therefore, the branch transmission method according to the present invention directs all or some of the channels between the slave stations among the channels to be allocated between the specific slave station and the master station for each information route,
The feature is that the number of channels is temporarily increased and the number of channels is temporally changed to transmit / receive a multiplexed signal.

[Action]

The number of channels assigned to each information route is changed with time. As a result, a plurality of channels can be assigned to one direction at a certain time (or time zone), and the data amount of a certain route is not congested, and data can be transmitted smoothly.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 1 shows an example of a digital multiplexing device of a master station or a slave station in a system of a branch transmission system of a multiplexed signal. The digital multiplexer of this embodiment (first
() Is the same as in the system of FIG.
It is one of those used in 4 stations of No. 4, and in addition to the configuration of the conventional device (Fig. 10), all channels are changed to insignificant information such as all "1" and destination information at every time. The memory 103 and the microprocessor (M
P) 102 was provided. Further, the branch connecting devices 5 and 6 in FIG. 7 have a circuit configuration as shown in FIG. 8 described above. For example, as shown in FIG. 11, the branch connecting device 5 has two directions (M1 station). , M2) signals (information) input from one direction and output in one direction, when both input signals from two directions are all “1” (the shaded portion of the channel from M1 and M2 stations) Is output all "1" (the hatched portion of the channel to the branch connection device 6),
all “1” (shaded part of M1 station channel) and destination information (M2 station channel “D”,
If it is “E”), the destination information (“D”, “E” of the channel to the branch connection device 6) is output,
Both input signals from the two directions are the destination information (M1
Station, the channel of the M2 station), the master station and the slave station output information that ignores the reception (the "?" Portion of the channel to the branch connection device 6). This system, when transmitting and receiving digital signals between a master station (for example, M1 station) and a slave station (for example, M2 station) via a high-speed digital line, the number of route combinations between the master station, slave stations, and slave stations. Channels (CH1 to CH6) are provided according to the above, and these (channels) are time-division multiplexed to form a multiplexed signal. Then, information or insignificant information to the transmission destination is assigned to each channel and transmitted to the transmission destination via the branch connection device.

In this embodiment, a predetermined channel (for example, M1 station) used between the master station and a specific slave station is set for each predetermined time zone (every time T1 to T3 in FIG. 2A). How many channels are used between CH1) assigned to M2 stations, between the above master station (M1 station) and other slave stations (for example, M3 station) or between slave stations (for example, between M2 station and M3 station) A channel to which the above channel is added is used as a channel used between the master station (M1) and a specific slave station (M2). For example, at time T1 in FIG. 2 (a), station M1 and station M2
Channels (CH1, CH4) are assigned to the station. Information to the transmission destination between the master station and a specific slave station is assigned to this channel, and a channel other than the channel used between the master station and the specific slave station (second
At time T1 in the figure (a), non-significant information (all “1” or a in the channels CH1 and CH4 in the M3 station and the M4 station).
ll "0", but in this embodiment, all "1")
Is assigned by each station to change the specific slave station (station M2 to station M3 at time T2). Then, data is collected from all slave stations (M2 to M4 stations) or some slave stations (M2 station only) to the master station (M1 station).

In the figure, the same numbers as in FIG. 10 indicate the same contents. 10
1 is a multiplexing control circuit, which is a microprocessor 10
2 and the memory 103, the transmission control signal 109 and the reception control signal 110 can be set in a wide range and made variable.

FIG. 2 shows T0, T1 of each TDM1 to 4 of the M1 to M4 stations.
1 shows an example of a setting pattern at each time or time zone of T2 and T3, where 1 is an output setting table of the transmission control signal 109 and 2 is an output setting table of the reception control signal 110.

T0 to T3 are examples of set time (or time zone) patterns. For example, T0 is in a normal state, T1 is used by 1CH more than usual, and data is concentrated and transmitted from the M2 station to the M1 station. Time pattern, similarly T2 uses 1CH more than usual and concentrates data from M3 station to M1.
A time pattern for transmitting to the station, T3 is a time pattern for using 1CH more than usual and concentrating data from the M4 station and transmitting to the M1 station. The output setting tables of the transmission control signal 109 and the reception control signal 110 shown in Tables (1) and (2) of FIG. 2 are input to the memory 103 of each multiplexing control circuit 101 of the M1 to M4 stations and the corresponding time is reached. Microprocessor μ to output the memory output all at once according to each setting table
Control with p102.

By doing so, in the time pattern T1, the transmission signal is the third signal.
It can be as shown in the figure. Similarly, the time pattern T2 can be as shown in FIG. 4, and the time pattern T3 can be as shown in FIG. FIG. 6 (a) shows this by drawing a line.

The number of transmission CHs in the direction of M2 → M1 station, the number of transmission CHs of M3 → M1 station, and the number of transmission CHs of M4 → M1 station at each time are as shown in FIG. 6 (b). That is, time T
In No. 1, data can be transmitted from the M2 station to the M1 station using 2CH of CH1 and CH4. At time T2, M3 → M
Data can be transmitted to one station using 2CH of CH2 and CH4. At time T3, C for M4 → M1 station
Data can be transmitted using 2CH of H3 and CH6. In such a case, time T0, T1, T2, T
By changing the interval of 3, the transmission amount can be increased for the route having a large amount of data.

As described above, in this embodiment, when the amount of data to be transmitted between the master station and a specific slave station is very large, the master station and other channels are set in a predetermined channel to be used between these stations. Some channels to be used between the slave stations or between the slave stations are added, and the channels including the added channels are used for data transmission between the master station and a specific slave station.

In this embodiment, since the two-way branch connection device is composed of AND gates as shown in FIG. 8, it is assumed that all “1” s are transmitted for the hatched CHs as shown in FIG. In the 0th-order TDM 111-1 to n shown in FIG. 1, all "1" code generation circuits 123-1 to 123-1-n are provided to set all the bits in the CH to "1".
If the two-way branch connection device is composed of NAND gates, all “0” will be transmitted instead of all “1”.
Therefore, 123-1 to 12n are all "0" code generation circuits.

In FIGS. 2 and 3, the number of channels allocated to each station is one, but the same applies when a plurality of channels are allocated according to the amount of data.

FIG. 6 (c) shows another pattern setting, which is always time T.
It is shown that each CH assigned at 0 (always) can be changed at times T1, T2 and T3 as shown here. That is, at time T1, 3 CHs of CH5 and CH6 in addition to CH1 are allocated to the M2 → M1 station. At that time, CH2, C for M3 → M1 station, M4 → M1 station
Each CH of H3 is assigned. In this way, this CH can be used to increase the transmission capacity between the master station and the slave stations when the transmission amount between the slave stations is small.

〔The invention's effect〕

As described above, according to the present invention, since the number of channels allocated for each information route is changed with time to transmit / receive a multiplexed signal, information can be efficiently transmitted / received in accordance with a time zone. Becomes

[Brief description of drawings]

FIG. 1 is a block diagram of a multiplexer for showing an embodiment of the present invention, FIGS. 2 (1) and 2 (2) are transmission and reception control signal setting charts,
3 to 5 are status diagrams of channel allocation and transmission signal examples, and FIG.
Figures (a), (b) and (c) are channel allocation change charts, Fig. 7 is a transmission system diagram, Fig. 8 is a bidirectional branch connection device block diagram, and Figs. 9 (a) and (b) are channel allocations. , Send / receive status diagram,
FIG. 10 is a configuration diagram of a conventional multiplexer, and FIG. 11 is a channel assignment and transmission / reception status diagram according to the conventional method. M1 ... Master station, M2-M4 ... Slave stations, 1-4 ... Digital multiplexer (TDM), 5 ... Two-way branch connection unit (BU).

Claims (1)

[Claims] 1. When synthesizing information to a transmission destination input from two directions and outputting to one direction, when both input signals from two directions are all non-significant information such as "1" When the non-significant information is output, the non-significant information and the information to the transmission destination are output, and when the input signals from two directions are both information to the transmission destination. Is equipped with a branch connecting device that outputs information that the master station and slave stations ignore reception, and a plurality of branch connecting devices are provided in the middle of the high speed digital line to branch the line and the line end of this branched high speed digital line. A system is formed by connecting a master station or a slave station to a master station, and when a digital signal is transmitted and received between the master station and the slave station via a high-speed digital line in this system, a route combination between the master station and the slave stations and the slave stations is used. Channel according to the number Is provided to form a multiplexed signal by time-division multiplexing, and the information or insignificant information to the transmission destination is assigned for each channel and the branch of the digital signal to be transmitted to the destination via the branch connection device. In the transmission method, add a channel used between the master station and other slave stations or between slave stations to the predetermined channel used between the master station and a specific slave station for each predetermined time zone. The channel used between the master station and a specific slave station, and the channel used between the master station and the specific slave station while assigning information to the transmission destination between the master station and the specific slave station to this channel. A branch transmission system for multiplexed signals characterized by collecting data from specific stations to the main station by allocating insignificant information to channels other than the above.