JPH01284041A - Broad band terminal connection method - Google Patents

Abstract

PURPOSE:To eliminate the need for any interface device and an interface line and to simplify the extension work by detecting a time slot number in one frame of a specific pattern from an opposite connection terminal equipment. CONSTITUTION:A broad band terminal equipment (TE) 40 before the connection to an opposite terminal equipment sends the 2nd specific pattern to all time slots at all times. A data from a digital exchange network (EX) is buffered in the 1st register (REG1) 407 for each frame and stored in the 2nd register (REG2) 409. A controller (CTL) 410 detects how many time slots of the 2nd specific pattern from an opposite terminal equipment exist in one frame. Then in case of sending a data to the opposite terminal equipment, the 2nd pattern generating switch 402 is switched to the position of a coder (COD) 401 to decide the operating speed of a coder (COD) 401 and a decoder (DCOD) 406 in response to the number of time slots of the 2nd specific pattern detected in one frame.

Description

[Detailed Description of the Invention] [Summary] An interface and an interface for notifying the communication band provided in an exchange, regarding a wideband terminal connection system, and in particular, a method for determining the communication band of a variable wideband terminal such as an image terminal. In a digital switching system that is equipped with an exchange and multiple wideband terminals with variable bandwidth connected to the exchange, the purpose is to reduce costs and simplify expansion work by eliminating the need for wires. The device includes a specific pattern generating means for generating a specific pattern, and a first pattern inserting device for inserting the first specific pattern into an empty tie-slot in a signal path between the exchange and a plurality of variable band wideband terminals. and each of the broadband terminals has a second specific pattern different from the first specific pattern.
a second pattern sending means for sending a specific pattern of the above to all time slots of a signal path between each of the broadband terminals and the exchange, and identifying time slots of the second specific pattern in the signal sent from the exchange. The apparatus is configured to include a second pattern identifying means and a communication band determining means for determining a communication band according to the output of the second pattern identifying means.

[Industrial application field]

The present invention relates to a wideband terminal connection system, and particularly to a method for determining a communication band of a variable wideband terminal such as an image terminal.

In the PCM encoding transmission method of the public telecommunications network, 64Kb
PS digital information is 2! The signals are multiplexed and transmitted on a transmission line with 32 time slots of Jbps.

Initially, certain types of information such as image information were transmitted using 6 time slots out of the 32 time slots. However, with advances in band compression technology, it has become possible to transmit image information and the like using fewer time slots than six time slots. Therefore, variable wideband terminals that can change the communication speed depending on the communication band (communication speed) of the connected terminal have been put into practical use.

In the variable wideband terminal connection system, it is necessary to set a communication band according to the communication speed of the communication partner terminal to perform communication.

[Conventional technology]

FIG. 6 is a block diagram showing a conventional broadband terminal connection system using a digital switching network.

In the figure, 60 is a digital exchange network (EX), a network (NW) 601, a common control device (C[:
) 602, Digital Central IA Trunk (DTK) 60
3, and a plurality of video line circuits (VLC) 604. Each video line circuit (VLC) 604 is provided corresponding to a wideband terminal (TE) 61. Digital switched network (E) with respect to public network (CO) 62
X) On the opposite side of 60, there is a digital switching network (
EX) 60 and a broadband terminal (TB) 61.

63 is a console (C3L) that manages and controls path connections between the terminals (TE) 61.

When connecting between broadband terminals (TO) 61 via two digital exchange networks (EX) 60, a console (C
3L) 63 accesses both common control units (CC) 602 via the public network (CD) 62, first checks the line usage status of each digital exchange network (EX) 60,
Based on the results, the band (number of time slots) that can be used for connection between broadband terminals (TE) 61 is determined. Specifically, the broadband terminal (TE) 61 and the video line circuit (
Check the number of free time slots available among the 6 time slots between VLC) 604 and VLC) 604.

Then, based on the determination of the number of available time slots,
Console (C3L) 63 to both digital exchange networks (
EX) 60 to connect the necessary paths.

In response to this instruction, the common control unit (CC) 602 performs path connection and notifies the broadband terminal (TE) 61 of the number of usable time slots. The broadband terminal (TE) 61 starts communicating in the notified band. As a result, broadband communication is performed according to the availability of the digital exchange network (EX) 60.

[Problem to be solved by the invention]

In the conventional broadband terminal connection method described above, a common control device (
Since it is necessary to provide an interface device 64 between the CC) 602 and the broadband terminal (TB) 610 for notifying the broadband terminal (TO) 61 of the number of free time slots, the price of the entire system becomes high, and the broadband terminal (T
When expanding E), it is necessary to separately provide the interface line 65, so there is a problem that the expansion work is complicated.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to reduce the cost and simplify the installation work by eliminating the need for an interface device and an interface line for notifying the communication band provided in the exchange.

[Means to solve the problem]

FIG. 1 is a block diagram of the principle of the present invention.

In the figure, the broadband terminal connection method according to the present invention is 1
is an exchange, and 21 to 2n are a plurality of variable band wideband terminals connected to the exchange 1. Exchange 1 and broadband terminal 21
~2n constitute a digital switching system. Exchange 1
The specific pattern generating means 11 generates the first specific pattern (2), and the first specific pattern is inserted into an empty time slot of the signal path between the exchange 1 and the plurality of variable band broadband terminals 21 to 2n. first bagoon insertion means 1 for
2.

Each of the broadband terminals 21 to 2n sends out a second specific pattern (2) different from the first specific pattern to all time slots of the signal path between each of the broadband terminals 21 to 2n and the exchange 1. a second pattern identification means 202 for identifying a time slot of a second specific pattern in a signal sent from the exchange 1; and a communication band determined according to the output of the second pattern identification means 202. communication band determining means 203.

[For production]

Each of the second patterns (■) sent to all time slots from the second pattern sending means of the other party's terminal (not shown) is
The first pattern insertion means 12 switches the broadband terminals 21 to 2n to be connected. Then, the first specific pattern from the first pattern generating means is inserted into the empty time slot created as a result of this switching.

Each of the broadband terminals 21 to 2n on the receiving side determines how many time slots in the received signal the second pattern identifying means 202 identifies as the second pattern identifying means 202.
It is identified whether the pattern is pattern (■) and how many time slots are the first time slot (■). As a result, each of the wideband terminals 21 to 2n on the receiving side detects the second specific pattern (■) only in the time slots connected to each other, and detects the first pattern (■) in other time slots,
Then, the communication band is determined according to the number of reception time slots of the second specific pattern (2).

〔Example〕

FIG. 2 is a block diagram showing an embodiment of the present invention. In this figure, the same parts as in FIG. 6 are given the same reference numerals. That is, 60 is a digital exchange network (EX),
Network (NW) 601, common control device (CC)
602, Digital Trunk Trunk (DTK) 603
, and a plurality of video line circuits (VLC) 604. Each of the video line circuits (VLC) 604 is a wideband terminal (TE) improved in accordance with the present invention.
21. On the opposite side of the public network (CD) 62 from the digital exchange network (EX) 60, there is a digital exchange network (BX) 60 and a broadband terminal (TE) 21 having a similar configuration. 63 is a console (C3L) that manages and controls path connections between the terminals (TB) 21.

According to an embodiment of the invention, the network (Nltl) 60
1 is connected to a first pattern generation circuit 22 .

Also, an interface device 64 shown in FIG.
and interface line 65 are unnecessary in FIG.

FIG. 3 shows 2! transmitted between the video line circuit (VLC) 604 and the broadband terminal (TE) 21. A b p
FIG. 2 is a diagram showing the format of one frame of a signal of s.

In the figure, one frame consists of 32 time slots, time slot TSO is used for synchronization pattern, and other time slots TSI to TS31 are used for transmitting data patterns. One time slot consists of 8 bits. Image information is from time slot TSI~
It is transmitted using a maximum of 6 time slots in TS31.

FIG. 4 is a block diagram showing an example of the configuration of a broadband terminal (TIE) 21 provided according to an embodiment of the present invention. In the figure, 401 is a coding device (COD) that converts image information into a bit string, 402 is a switch for generating a second pattern, and 403 is an inserter (1) for inserting a synchronization pattern.
, 404 is a driver (D), 405 is a receiver (R
), 406 is a decoder (DCOD), 407 is the first
408 is the timing generator (TG), 409 is the second register (R[EG2
), 410 is a control device (CTL).

The connection operation of the embodiment of the present invention will be explained with reference to FIGS. 2 to 4.

The broadband terminal (TE) 21 before connection with the other party terminal
A specific pattern ■ is always sent to all time slots. For this purpose, the control device (CTL) 410 controls the second pattern generation switch 402 to generate a fixed pattern, which is the second specific pattern (2), for example, "All+1".
01+” to synchronization pattern inserter (1) 40
3 and driver (D) 404 to the digital exchange network (EX) 60.

Receiver (R) 405 is digital exchange network (EX) 6
The synchronization pattern in the data received from 0 is taken into the timing generator (TG) 408, and the remaining data of time slots TSO to TS31 are stored in the first register (REGI ) 407 and stored in the second register (R6G2) 409.

The control unit (CTL) 410 has a second register (RE
G2) 409 is constantly scanned to detect how many time slots there are of the second specific pattern (■) from the partner terminal in one frame. The second specific pattern (2) is a fixed pattern such as "00000000" sent from the other party's terminal. When transmitting data to the other party's terminal, the control device (CTL) 410 switches the second pattern generation switch 402 to the encoding device (COD) 401 side, and generates the second specific pattern detected in one frame. ■According to the number of time slots, the encoding device (COD
) 401 and the operating speed of the decoder (DCOD) 406. Incidentally, the time slots other than the time slots of the second specific pattern ■ received by the broadband terminal (TE) 40 are of the first specific pattern ■, for example,
A pattern such as "01111111" is received in each time slot. This first specific pattern is
It is generated by the pattern generation circuit 22, inserted into an empty time slot in the network (NW) 601, and sent to the broadband terminal (T8) 40.

FIG. 5 is a block diagram showing the configuration of a video line circuit (VLC) 604. In the figure, 50 multiplexes #1 to #31031 signals from a network (Nl) 601 and a synchronization pattern to 64 bps x 32.
= 2M multiplexer, 51 is the driver, 5
2 is the receiver, 53 is the 2 from the broadband terminal (TE) 40.
This is a demultiplexer that distributes an Mbps signal into 64Kbps.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, by detecting the number of time slots in one frame of a specific pattern from a connected terminal, communication is possible in an appropriate band, and moreover, it is possible to communicate in an appropriate band. This eliminates the need for interface devices and interface wires, which reduces costs and simplifies expansion work for broadband terminal connection systems.

[Brief explanation of the drawing]

Figure 1 is a block diagram of the principle of the present invention, Figure 2 is a block diagram showing an embodiment of the present invention, and Figure 13 is a block diagram of the principle of the present invention.
A diagram showing the format of one Mbps frame, FIG. 4 is a block diagram showing a configuration example of the wideband terminal (TE) 40 shown in FIG. 2, and FIG. 5 is a video line circuit (VLC) shown in FIG. 2. 6
FIG. 6 is a block diagram illustrating a conventional broadband terminal connection system. In the figure, 40... wideband terminal + Te), 60...
...Digital Exchange Network (BX), 601-...Net)
7-ri (NW), 60:”Common control device (CC)
, 603...Digital trunk trunk (DTK),
604...Hi f'' line circuit (VLC), 62
``4 networks (CD), 63...console (C3L).Patent d applicant Fujitsu Ltd. Patent application agent

Claims (1)

[Claims] 1. In a digital switching system comprising an exchange (1) and a plurality of variable band broadband terminals (21 to 2n) connected to the exchange (1), the exchange (1) comprises: , 1st
Specific pattern generation means (11) for generating a specific pattern of
), and a first pattern insertion means () for inserting the first specific pattern into an empty time slot of a signal path between the exchange (1) and the plurality of wideband terminals (21 to 2n) of the variable band. 12), each of the broadband terminals (21 to 2n) applies a second specific pattern different from the first specific pattern to the broadband terminal (2n);
1 to 2n) and the exchange (1), the second pattern sending means (20
1), a second pattern identification means (202) for identifying the time slot of the second specific pattern in the signal sent from the exchange (1), and the second pattern identification means (202);
2. A broadband terminal connection system characterized by comprising: communication band determining means (203) for determining a communication band according to the output of (202).