JPS61107837A - Time division multiplex communication equipment - Google Patents

Abstract

PURPOSE:To simplify the device constitution and to reduce the cost by combining a communication line supervisory controller and a communication synchronizing device and designating a branching insertion circuit to branch and insert directly terminal information plural transmission lines on a transmission/ reception data bus. CONSTITUTION:A reception data from a transmission line A is given to an equipment 1, subject to code conversion, frame synchronization, clock extraction and frame phase synchronization of transmission/reception data by a transmission line connecting circuit 8 and the result is given to a branching insertion circuit 7. An equipment 2 connected to a transmission line B acts like similarly. The equipments 1 and 2 are synchronized by using the synchronizing signal from a communication network synchronizing device 12 installed per station. The circuit 7 between the equipments 1 and 2 is designated by using a line setting signal from a communication line supervisory control circuit 11 and various information is subject to direct digital branch and insertion between the equipments 1 and 2 on transmission/reception buses 5, 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] This invention relates to a communication device that digitizes stories, data, image information, etc. and transmits them using a time division multiplexing method.

[Conventional technology]

FIG. 8 is an example of a circuit configuration for relaying information from terminal devices using a conventional circuit. In the figure, (1) is a device connected to transmission path A, (21 is a device connected to transmission path B, 3)
is the terminal equipment, (4) is the terminal equipment connection circuit, (5) is the transmission data bus, (6) is the reception data bus, (8) is the transmission line connection circuit, (9) is the timing generation circuit, αG 1 is a monitoring control circuit, and (1) is a terminal signal relay connection device.

Next, the operation will be explained. The received data from the transmission path A is connected to the device (1), and the transmission path connection circuit (8) converts the data into a transmission path code (for example, CMI code, Code Mark, In
version ) to HR'z code (Hon-Re
Turn t.

Zero), etc., and then convert the frames of the received data.
□The received data after synchronization and clock extraction is connected to the reception path (6), and then connected to the terminal device (3) via the terminal device connection circuit (4). On the other hand, the transmission data from the terminal device (3) is sent to the terminal device connection circuit (4).
), the transmission path connection circuit (8) via the low transmission data path (5)
) is converted into a transmission path code n and sent to transmission path A. Timing generation circuit (9) and supervisory control circuit Qd 1. ? It is a common part for the device (1) to operate normally, and the timing generation circuit (9) is a common part for multiple terminal equipment connection circuits (4).
The supervisory control circuit αd has the function of controlling the time slots for inputting and outputting the transmitted and received data to and from the transmit data bus (5) and the receive data bus (6), and also controls the alarm operation display of the device.

Transmission and reception data from transmission path B is connected to the 9th position (21) and performs the same operation as above.

When relaying terminal information between the transmission path A and the transmission path 3, the transmission/reception data from the terminal device connection circuit (4) is relayed by the terminal signal relay connection device (1).

[Problem that the invention seeks to solve]

Conventional time-division multiplexing equipment is configured as described above1, so when relaying signals between multiple transmission lines, it is necessary to have as many terminal device connection circuits (4) as there are terminal devices to be relayed. is required, and a terminal signal relay connection device @(E) is required.
However, in terms of system configuration, there are problems in that the system configuration requires many equipment configurations and becomes expensive.

This invention was made to solve the problems mentioned above, and aims to provide a time division multiplex communication device that can eliminate the terminal device connection circuit (4) and the terminal signal relay device. .

[Means for solving problems]

The time division multiplex communication device according to the present invention has a new add/drop circuit (7) added, and is combined with a communication line monitoring and control device 0 and a communication network synchronization device (to) to transmit and receive terminal information between multiple transmission paths. This is a digital drop/add directly on the bus.

[Effect]

In this invention, the drop/add circuit (7) specifies a drop/add line between multiple devices by a line setting signal from a communication line monitoring control value @0, and also specifies a drop/add line between multiple devices by a synchronization signal from a communication network synchronizer (to). By providing synchronization between the data buses, direct digital branch/insertion can be performed on the transmit/receive data bus.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, (1) is a device connected to transmission path A, (2)
is the device connected to transmission line B, (3) is N talk, data,
Various terminal devices such as images, (4) are terminal devices (1)
, (2) is a terminal connection circuit connected to, (5) is a transmission data bus, (6) is a reception data bus, (7) is a branch/add circuit, (8) is a device (1) connected to transmission paths A and B. , (2), (9) is a timing generation circuit for normal operation of the device (1), (21), αO is a supervisory control circuit, wholesale is a communication line supervisory control device, ＠ is a communication network synchronization device, and in FIG. is the write circuit for the loss Wα4, αG is the readout circuit for the loss cause α4, (b) is the displacement setting circuit for II writing/reading, QE9 is the gate circuit for own station transmission data, and Q is the gate circuit for the inserted data. be.

Next, I will explain the masterpiece. The received data from the transmission line A is connected to the device (1), and the transmission line connection circuit (8) performs code conversion, frame synchronization, clock extraction, and frame phase synchronization of the transmitted and received data, and then the data is sent to the add/drop circuit (7). Connected. In the branch/add circuit (7), only the necessary bits of the received data connected to the terminal equipment of the own station are written to the RAM circuit for the received data of the own station (to), and the bits of the received data to be relayed to the transmission path B are written. , Branch data station (Write to circuit a4. RAM circuit (to), α→ write address control is to α4 write circuit (to), read is to RAM circuit
(This is done by the control signal from the readout circuit αG of 14. Also, the phase difference (bit number) between the write circuit (g) and the readout circuit αG is determined by the write/read displacement setting circuit αη
This is done by

On the other hand, the transmission data from the local terminal switcher is sent to the branch/add circuit (
7) The insertion data from the self-station transmission data gate circuit (g) and transmission line B are combined by the insertion data gate circuit α1 and sent to transmission line A via the transmission line connection circuit (8). be done.

The connections between the transmission data bus (5), the reception data bus (6), the terminal device connection circuit (4), and the terminal device (3) are the same as the operation of the conventional circuit, and the operation regarding the transmission path B is also the same as the transmission line B described above. The operation is similar to that of path A.

If the branch/insert data input/output points of each branch/insert circuit (7) of the system @(υ, (2)) are connected to each other, direct digital branch/insert can be performed in a state equivalent to that on the transmit/receive data bus.

Specifically, the bit branching starts and ends at each time slot number on the reception data bus (6) from one A communication line monitoring and control device, and the bit branching to the transmission data bus (5) on another transmission path is performed. The device (1) sends line setting signals such as the amount of bit displacement to be converted.
, (2) at the same time, and the communication network synchronization bag gi(2)
A synchronization signal that can synchronize the frame phase of the transmitting and receiving data bus is simultaneously supplied to the device N (1) and (2) from the device! (
1), (This is possible by synchronizing the frame phase between 21.

In addition, in the above embodiment, only transmission path A%B.

The branch insertion port had only one port, but there were two transmission lines.
Even in the above-mentioned case, if the add/drop ports of the add/drop circuit (7) are made into a plurality of two or more, the same effect as the two-way relay described above can be obtained.

Further, the operation by the circuit of the present invention can be applied to a transmission/reception data bus having an arbitrary frame length.

〔Effect of the invention〕

As described above, according to the present invention, one branch/insertion circuit (
With the addition of 7), multiple terminal device connection circuits (4)
Since the structure is designed to eliminate the
In addition, there is an effect obtained by having high precision.

[Brief explanation of the drawing]

FIG. 1 shows the circuit configuration of a time division multiplex communication device according to an embodiment of the present invention, FIG. 2 shows a detailed diagram of the add/drop circuit of the present invention, and FIG. 8 shows a circuit diagram of a conventional device. (1) is a nailing device connected to transmission line A, (2) is transmission line B
(3) is the terminal equipment, (4) is the terminal equipment connection circuit, (5) is the transmission data bus, (6) is the reception data bus, (7) is the branch/insertion circuit, (8) is the device to be connected to the Transmission line connection circuit, (9) is a timing generation circuit, αO is a monitoring control circuit, wholesale is a communication line monitoring and control device, @ is a communication network synchronization device,
(to) is a leg circuit for own station reception data, α4 is a RAM circuit for branch data, α→ is a write circuit for RAM α→, αG is a read circuit for RAM Q4, αη is a displacement setting circuit for *S loading/reading, (to) is a gate circuit for own station transmission data, a9 is a gate circuit for insertion data, and (a) is a terminal signal relay connection device. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] In communication equipment that digitizes and transmits various information such as telephone calls, data, and images using a time-division multiplexing method, synchronization is achieved between multiple devices using a synchronization signal base from a communication network synchronizer installed at each station. At the same time, a line setting signal from a communication line monitoring and control device installed at each station specifies a branch/add line between multiple devices, and various information is directly digitally branched/inserted on the transmission/reception bus between multiple communication devices. A time division multiplex communication device characterized by: