JPH0372763A - Communication system - Google Patents

Abstract

PURPOSE:To reduce the time required for switching of stations by providing a switch for making a time slot corresponding to each other to both stations and making the content of both switches identical. CONSTITUTION:Stations 2, 5 and stations 3, 4 are provided respectively with a time slot correspondence switch and switch information is made identical to the stations 2, 5 and stations 3, 4 respectively. Thus, the corresponding information being the contents of the switch at the time of station switching is not required. Thus, the switching time is reduced by controlling a data output gate of a time slot with communication switching signals inverted for two stations.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a communication system in which an exchange is connected to stations of a network connected by transmission paths.

(Prior Art) Conventionally, switching equipment has often adopted a duplex structure to ensure reliability. Similarly, a method of duplicating the network connected to the exchange can be considered, but this would require duplicating the transmission lines and stations, which would significantly increase costs.

For this reason, a method can be considered in which one exchange is connected to two stations and one of the exchanges is selected from the exchange. but,
If you try to exchange data by associating the time slots for transmitting data on the exchange and the time slots for transmitting data from the network, the correspondence will be difficult. Switch information must be memorized for each station, and if this information is only available at one station connected to the exchange, when changing communication cycles,
Switch information for time slot correspondence must also be transferred, which takes a considerable amount of time.

For example, when telephone voice data is exchanged between an exchange and a network, the voice is interrupted when stations are switched, so it is obvious that it is better to keep this time as short as possible.

(Problem to be Solved by the Invention) When switching the stations connected to the exchange in a system that exchanges time slot information between the exchange and the network in this way, only one station can exchange the associated switch information. Otherwise, the information would have to be transferred every time the station is switched, and the switching time would become extremely long.

The present invention aims to solve the above problems and shorten the time for station switching.

[Structure of the Invention] (Means for Solving the Problems) The present invention 1-1 to achieve the above object is to connect a network having a plurality of stations connected by a transmission line and an exchange accommodating a large number of terminals. Therefore, the switch has a large number of time slots on a periodic frame used to transmit data to the network, and a large number of time slots on a periodic frame used to transmit data within the network, and the above In order to mutually exchange data in two time slots, we have a switch that corresponds to the time slots to transfer the data on the time slots, and one exchange is connected to the two stations of the network, and one exchange is connected to one of the exchanges. In a system that controls communication by outputting a communication switching signal to a station, the switch for associating time slots is provided in both of two stations connected to one exchange, and the memory contents are the same for both stations. When the communication switching signal is on, data from the exchange is output to the network time slot according to the switch contents, network data is similarly output to the exchange according to the switch contents, and the communication When the switching signal is off, output is disabled in both directions, and when switching between stations, the communication switching signal that is input to the two stations is inverted as described above, so that the switching is instantaneous. It is characterized by doing.

(Function) In the communication system according to the present invention, both stations have a switch for time slot correspondence as described above, and the switch information on both sides is the same, so that the contents of the switch can be changed when switching between stations. There is no need to transfer information.Also, by adopting a method in which the data output gate of the time slot is controlled by the communication switching signal that is inverted between the two stations, the switching time can be significantly shortened. It has been realized.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an overview of a communication system according to an embodiment of the present invention. In the figure, 1 is a transmission line, 2 to 5 are stations, and 6 and 7 are exchanges. The exchange 6 is a station 2 connected to the transmission line 1.
5, and exchange 7 is connected to station 3.4.
Assume that it is connected to. Also, stations 2 and 5 and station 3
and 4 are each equipped with a switch for time slot correspondence, and the switch information for time slot correspondence is the same for stations 2 and 5 and stations 3 and 4, respectively. Here, it is assumed that the communication switching signal is on at stations 2 and 3.

For example, when a call is made from a terminal connected to exchange 6 to a terminal connected to exchange 7, the time slots of the exchange and the network are associated, and exactly the same information is passed to stations 2 and 5. However, since it is station 2 whose communication switching signal is on, the data from the exchange is input to the network from station 2.

Either the data in the time slot on the network is transferred to the time slot of exchange 7 by stations 3 and 4, or the data is transmitted from station 3 since it is station 3 whose communication switching signal is on. be done. Data from exchange 7 to exchange 6 is also transmitted from station 3 to station 2.

Next, a block diagram inside the station is shown in FIG.

In the figure, 8 is an input/output unit on the station side, 9 is an output unit on the exchange side, 10 is a communication switching signal input unit, 11 is an ES memory,
12.13 is a memory with time slot correspondence that switches data according to the memory contents. 14, 15, 1.6
, 1.7 is a counter, 18 is a switch side gate, 19 is a station side gate, 20°21 is a serial parallel converter, 22
．． 23 is parallel serial converter, 24.25.26i
;L selector, 27.28 is buffer, 29 is CPU,
30 is a CPU bus.

The data from the exchange side is sent to the serial-parallel converter 20.
is converted to parallel data. The parallelized data is written into the ES memory 11 using the clock on the exchange side to absorb the phase difference of the exchange, and is read using the clock on the station side.

The data output from the ES memory 11 is temporarily input to the buffer 27 for time slot output on the station side.
At this time, the value in the memory 12 for time slot correspondence is referred to and its contents are written into the area of the buffer 27 which is the address.

That is, the value in the memory 12 is the address of the buffer 27 into which data is to be written, and the memory 12 stores information corresponding to each time slot of the exchange. This allows switching of data in the network and exchange time slots.

The data output from the buffer 27 is converted into serial data by the parallel-serial converter 22 and output to the station side. However, in order to output to the station side, gate 1 on the station side
9, and if the communication switching signal from the communication switching signal input section 10 is off, only a silent signal is output to the office side.

Further, data input from the station side is converted into parallel data via a serial-to-parallel converter 21 and input to a buffer 28 . When the data is input from the buffer 28 to the parallel-serial converter 23, the memory 3 for time slot correspondence is referred to, and the data is placed in the time slot on the exchange side.

The gate 18 on the exchange side, like the single gate, outputs only a silent signal when the communication switching signal is off.

Note that memory 12.1 for time slot mapping
3. can be read and written by the CPU 29, and the association pattern can be freely set.

Therefore, by programming the CPU, it is easy to make the switching of the two stations to which the exchange belongs the same.

As described above, according to this embodiment, it is possible to select at high speed the station on the network that will be the communication partner of the exchange from among the two.

[Effects of the Invention] As explained above, according to the communication system of the present invention, there is no need to transfer time slot correspondence information to the station switching II 4'7, and the time required for switching can be significantly reduced. can.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an overview of a communication system according to an embodiment of the present invention, and FIG. 2 is a block diagram showing the internal configuration of a station. DESCRIPTION OF SYMBOLS 1... Transmission line, 2-5... Station, 6, 7... Exchange, 8... Station side person output part, 9... Exchange side person output part,
11...ES memory, 12.13...Memory with time slot support, 18...Exchange side gate, 19...
・Station side gate, 27.28...Buffer, 29...
CPU. 0 Procedural amendment (voluntary) Patent application No. 1-208939 dated March 12, 1990 Relationship with the case of person amending the name of the invention communication system / Patent applicant (307) Sharakusha Co., Ltd. (,422) Japan Telegraph and Telephone Co., Ltd. Agent Address: 1-2-1 Kanda Tamachi, Chiyoda-ku, Tokyo (1) Correct ``At the time, the sound is heard'' on page 3, line 17 of the specification to ``The sound is heard during processing.'' (2) Figure 2 of the drawing is corrected as shown in the attached sheet. 7. Attached drawings: One or more copies Each section of the detailed explanation of the invention in the above specification and drawings.

Claims (1)

[Claims] For the connection of a network having a switch accommodating a large number of terminals and a plurality of stations connected by transmission lines, a large number of frames on a periodic frame used for transmitting data of the switch to the network. , and a number of time slots on a periodic frame used for transmitting data within the network, and in order to exchange the data in the two time slots with each other, data transfer on the time slots is required. In a system that has a switch that corresponds to time slots and further connects one exchange to two stations of a network, and controls communication by outputting a communication switching signal from the exchange to one station, two stations connected to one exchange are provided with memories for the connection, and the contents of the memories are the same, and when the communication switching signal is on, the data from the exchange is transferred to the network. The network data is output to the exchange, and when the communication switching signal is off, it is not output in both directions, and when switching the station for communication, the data input to the two stations is output as shown above. A communication system characterized by instantaneous switching by inverting a communication switching signal.