JP2002084334A - Bulk communication terminal adapter and time slot assigning method for the adapter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal adapter capable of conducting bulk communication for allowing data to flow through the same time slot at a transmitter side and a receiver side. SOLUTION: This terminal adapter 1, constituting a bulk communication system in which the plural terminal adapters 1 are connected through a bulk communication line 5, which is constituted by binding plural BRI high speed digital exclusive lines 51, is provided with a PRI line interface 11, a BRI line interface 14, and a time slot detecting means 12, having a slot detection synchronizing pattern generating function for loading and transmitting the slot detection synchronizing pattern on a leading time slot or a time slot synchronizing function for extracting the slot detection synchronizing pattern from data received by the BRI line interface 14, and for detecting the leading time slot by using the slot detection synchronizing pattern, and for machining the leading time slot of the received data and a frame clock, based on the leading time slot.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention supports a primary rate interface (hereinafter, also referred to as PRI) and has a basic interface (2B: 128 kbit / s; hereinafter, B
The present invention relates to a terminal adapter in a bulk communication system for performing bulk communication for transmitting communication data by bundling a plurality of high-speed digital dedicated lines (hereinafter also referred to as RI) and a time slot distribution method in the communication system.

[0002]

2. Description of the Related Art Conventionally, as an apparatus for providing a higher communication speed by using a plurality of lines, a plurality of circuit switching services or high-speed digital dedicated lines of a basic interface are accommodated, and these lines are bundled to form a plurality of lines. There is known a terminal adapter for bulk communication that performs communication at the sum of the communication speeds. For this bulk communication terminal adapter,
On the network side, a high-speed digital dedicated line of the basic interface is bundled to achieve a high communication speed, and the data terminal is connected to the V.NET. 35 interface or X.35 interface. There are known devices that use a dedicated line for the H.21 interface or the primary rate interface.

[0003] First, the data terminal side receives V. 35 interface or X.35 interface. The case of a device with 21 interfaces will be described. For example, when BRI uses 6B of 3 lines and cooperates at a data terminal speed of 384 kbit / s, bulk synchronization of 3 lines is performed to correct the delay of the line.
84 kbit / s communication is possible.

Next, a description will be given of a case where the data terminal is a device having a PRI leased line interface. Devices already exist that replace each time slot of the PRI with a high-speed digital leased line of the BRI. However, in this case, since the time slots are not synchronized, for example, BRI3
Using the line 6B, it is not possible to perform 384 kbit / s communication in which the time slot is combined between the sending side and the receiving side. V. 35 interface or X.35 interface. As in the case of the 21-interface device, if the bulk synchronization is performed and the delay of the line is corrected, the order of the time slots can be adjusted. However, since it is unknown where the corrected data is from the start position of the time slot, On the receiving side, data cannot be transmitted to the PRI in the correct time slot, and 384 kbit /
s could not be communicated.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve this problem. In a bulk communication system, after performing bulk synchronization and correcting a line delay, time slots are synchronized between terminal adapters. It is intended to provide a terminal adapter and a time slot allocation method in a bulk communication system, which can perform bulk communication in which data is transmitted in the same time slot between a sending side and a receiving side.

[0006]

In order to solve the above-mentioned problems, the present invention binds a plurality of high-speed digital leased lines of a basic interface between a plurality of terminal adapters supporting a primary rate interface as a data terminal side interface. The primary group speed interface, the high-speed digital leased line interface that bundles multiple high-speed digital leased lines of the basic interface, and the time of the high-speed digital leased line to the terminal adapter in the bulk communication system connected by the bulk communication line that sends communication data Slot detection synchronization pattern generating means for mounting and transmitting the slot detection synchronization pattern at the start position of the slot is provided.

In order to solve the above problems, the present invention is to bundle a plurality of high-speed digital leased lines of a basic interface (BRI) between a plurality of terminal adapters supporting a primary rate interface (PRI) as a data terminal side interface. A primary rate interface, a high-speed digital leased line interface that bundles multiple high-speed digital leased lines of the basic interface, and reception from a high-speed digital leased line to a terminal adapter in a bulk communication system connected by a bulk communication line that sends communication data A slot detection synchronization pattern is extracted from the obtained data, a time slot start position is calculated using the slot detection synchronization pattern, and the start position of the time slot of the received data is made coincident with the frame clock based on the time slot start position. Provided and timeslot synchronization unit.

In order to solve the above-mentioned problems, the present invention binds a plurality of high-speed digital leased lines of a basic interface (BRI) between a plurality of terminal adapters supporting a primary rate interface (PRI) as a data terminal side interface. A method of allocating a time slot in a terminal adapter in a bulk communication system connected by a bulk communication line for transmitting communication data, wherein a data transmission side terminal adapter is directed to a data reception side terminal adapter via a BRI communication line. Transmit the slot detection synchronization pattern from the time slot start position, the terminal adapter on the data receiving side receives the slot detection synchronization pattern,
The time slot start position of the data received from the data transmitting terminal adapter is adjusted to the time slot start position of the data to be transmitted to the primary rate interface, and the time slots of the terminal adapter are allocated.

According to the present invention, after performing bulk synchronization of the bulk communication line and correcting the delay of the line, the time slots between the terminal adapters are synchronized so that the sending side and the receiving side use the same time slot. Bulk communication that allows data to flow is enabled.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS With reference to FIG. 1, an outline of the configuration of a system for performing bulk communication between opposing data terminals using a terminal adapter according to the present invention will be described. In the figure, a suffix A indicates a device on one data terminal side (for example, a data transmission side), and B indicates a device on the other data terminal side (for example, a data reception side). Is a case where each device is described in common.

A bulk communication system using a terminal adapter according to the present invention includes a transmitting data terminal 3A, a transmitting terminal adapter 1A embodying the present invention, a high-speed digital leased line 5, and a receiving side embodying the present invention. Terminal adapter 1B
And the receiving side data terminal 3B. The data terminal 3 and the terminal adapter 1 are connected to the PRI dedicated line interface 31.
Terminal adapter 3 and high-speed digital leased line 5
Are connected by a plurality of BRI high-speed digital leased line interfaces 51.

The terminal adapter 1 has a data terminal 3 with a PRI.
When it operates as a terminal device on the leased line interface 31, it operates as a network, and when the data terminal 3 operates as a network on the PRI leased line interface 31, it operates as a terminal.

A plurality of high-speed digital dedicated line interfaces 51A and a plurality of high-speed digital dedicated lines 5 are provided between the transmitting terminal adapter 1A and the receiving terminal adapter 1B.
And a high-speed digital dedicated line interface 51B.

Terminal adapter 1 and high-speed digital dedicated line 5
A plurality of BRI high-speed digital dedicated line interfaces 51 are bundled (three in this example), and the connection is continued at a high communication speed (6B = 384 kbit / s). That is, between the terminal adapter 1 and the high-speed digital dedicated line 5, three BRIs (2B ×
3 = 6 channels) are bundled and connected, and there are 3 lines (6 channels) between the opposing data terminal 3 and high-speed digital leased line 5
BRI.

An outline of a detailed functional configuration of the terminal adapter 1 according to the present invention will be described with reference to FIG. Terminal adapter 1
Comprises a PRI line interface 11, a time slot detecting means 12, a bulk controlling means 13,
Line interfaces 14-1 to 14-3, read-only memory (ROM) 15, random access memory (RAM) 16, arithmetic processing unit (CPU) 17, and control for transferring control data among these elements And a bus 20.

The PRI line interface 11 is a means for connecting the terminal adapter 1 to the data terminal 3 via the PRI dedicated line interface 31, and interfaces between the PRI dedicated line interface 31 and the terminal adapter 1.

The time slot detecting means 12 transmits the BR to the transmitting terminal adapter 1A by bulk synchronization processing.
After correcting the delay of the I-line, a BRI high-speed digital leased line interface
In the receiving-side terminal adapter 1B, after correcting the BRI line delay by bulk synchronization processing, the reception-side terminal adapter 1B uses the slot detection synchronization pattern received from the BRI high-speed digital leased line interface 51. This is a means for detecting the start position (start time slot) of a time slot.

The bulk control unit 13 has a function on the transmitting side for distributing data transmitted from the transmitting side data terminal 3A via the PRI dedicated line interface 31 to a plurality of BRI high-speed digital dedicated line interfaces 51 for each time slot. A function on the receiving side that rearranges the data sent from the plurality of BRI high-speed digital leased line interfaces 51 in the order of time slots, and a function that corrects the delay between the lines of the BRI high-speed digital leased line interface 51 by bulk synchronization processing. have.

A plurality of BRI line interface units 14 are connected to a BRI high-speed digital leased line interface 51 of the high-speed digital leased line 5, and the BRI high-speed digital leased line interface 51 and the terminal adapter 1 are connected.
Interface.

The ROM 15 is a nonvolatile storage means for storing a program for controlling the operation of the terminal adapter 1 and the like.

The RAM 16 is storage means for temporarily storing data during operation of the terminal adapter.

The CPU 17 is an arithmetic processing unit for controlling the operation of the entire terminal adapter 1, and is constituted by using a microprocessor unit (microcomputer).

Referring to the sequence diagram shown in FIG. 3 and the data transmission / reception timing charts shown in FIGS. 4 and 5, after performing bulk synchronization and correcting the line delay, the time slot synchronization between the terminal adapters is performed. By taking
A method of transmitting data in the same time slot on the sending side and the receiving side to perform 384 kbit / s bulk communication will be described. In this example, the terminal adapter 1 and the data terminal 3
Is connected by a 1.5 Mbit / s PRI leased line interface 31, and the terminal adapter 1A and the terminal adapter 1 are connected.
6B (384 kbits) by bulk communication with three lines of the BRI high-speed digital leased line interface 51
/ S).

The description will be made on the assumption that the data terminal 3A-terminal adapter 1A is on the data transmitting side and the terminal adapter 1B-data terminal 3B is on the data receiving side.

FIG. 4 shows data on the transmitting terminal adapter 1A, and FIG. 5 shows data on the receiving terminal adapter 1B.
4A is a time slot on the PRI leased line interface 31A between the data transmission side data terminal 3A and the terminal adapter 1A, and FIG. 4B is a frame clock on the data transmission side on the PRI leased line interface 31A. 4
(C) shows a case where the transmitting terminal adapter 1A is the transmitting data terminal 3;
4A through the PRI leased line interface 31A. FIG. 4D shows the data transmission side terminal adapter 3.
A to BRI high-speed digital leased line interface 51
1B shows BRI transmission data transmitted to -1A, 51-2A, and 51-3A.

FIG. 5A shows a data receiving terminal adapter 3.
B is BRI high-speed digital leased line interface 51-
1B, 51-2B, and 51-3B, BRI reception data after slot correction, and FIG. 5C, reception from the reception-side terminal adapter 1B via the PRI dedicated line interface 31B. Side data terminal 3
PRI data sent to B, FIG. 5D shows a time slot on the PRI leased line interface 31B between the terminal adapter 1B and the data terminal 3B on the data receiving side, and FIG.
Indicates a frame clock on the data receiving side PRI dedicated line interface 31B. There is a time difference between the data transmission time slot shown in FIG. 4A and the data reception time slot shown in FIG. 5D.

At the time of data transmission, time slots 1 to 6 of data (FIG. 4C) transmitted from the transmitting data terminal 3A to the transmitting terminal adapter 1A via the PRI leased line interface 31A include "66 to BB". , CC ~ ”is loaded, and the receiving side data terminal 3B is transmitted from the receiving side terminal adapter 1B via the PRI leased line interface 31B.
Time slot 1 of data (FIG. 5 (c))
6, a time slot synchronization processing method for loading data of “66 to BB, CC to” will be described with reference to FIG.

First, all three lines of the high-speed digital dedicated line interface 51 of the BRI are connected to the high-speed digital dedicated line 5.
, The transmitting terminal adapter 1A and the receiving terminal adapter 1B perform bulk synchronization processing (step S1) via the high-speed digital dedicated line 5 to correct delay in the three lines of the BRI high-speed digital dedicated line interface 51. I do.

As a result of this bulk synchronization processing, the transmitting terminal adapter 1A and the receiving terminal adapter 1B are connected via the high-speed digital leased line 5 to 384 kbit / s (2B × 3).
Communication can be performed.

This bulk synchronization process is similar to the process from the transmitting terminal adapter 1A to the receiving terminal adapter 1B.
The same operation is performed from the receiving side terminal adapter 1B to the transmitting side terminal adapter 1A.

In this synchronization processing, the terminal adapter 1 does not transmit communication data to the data terminal 3 or the high-speed digital dedicated line 5.

Next, the slot detection sequence (step S2) will be described. After the bulk synchronization processing (step S1) is completed, a slot detection synchronization pattern XX is generated in the transmission-side terminal adapter 1A (step S21), and the time slot 1 at the start position synchronized with the first frame clock is used for BRI high-speed digital exclusive use. The data is transmitted to the line interface 51A (step S22). Simultaneously with the slot detection synchronization pattern generation processing, the transmission-side terminal adapter 1A enters a state of waiting for reception of the slot detection synchronization pattern from the reception-side terminal adapter 1B.

Similarly, the receiving terminal adapter 1B also generates a slot detection synchronization pattern XX (step S23).
In the time slot 1 at the start position synchronized with the first frame clock, the signal is transmitted to the BRI high-speed digital leased line interface 51B (step S24). Simultaneously with the slot detection synchronization pattern generation processing, the reception-side terminal adapter 1B enters a state of waiting for reception of the slot detection synchronization pattern from the transmission-side terminal adapter 1A.

When the receiving terminal adapter 1B extracts the slot detection synchronization pattern from the data received by the BRI high-speed digital dedicated line interface 51B, the receiving terminal adapter 1B sets the time of the data (FIG. 5A) received from the BRI high-speed digital dedicated line interface 51B. Calculate (detect) the slot start position. The receiving-side terminal adapter 1B transmits the time slot start position of the BRI reception data detected using the slot detection synchronization pattern and the frame clock (FIG. 5).
(E)) is synchronized with the BRI reception data (FIG. 5).
By delaying (a)), slot-corrected BRI reception data shown in FIG. 5B is obtained (step S25). Thus, the slot-corrected BRI reception data (FIG. 5)
(B)) is synchronized with the time slot (FIG. 5 (d)) and the frame clock (FIG. 5 (e)) of the transmission / reception data on the PRI leased line interface 31B.

Similarly, the transmitting-side terminal adapter 1A
I. Extract the slot detection synchronization pattern from the data received by the high-speed digital
I The time slot start position of the data received from the high-speed digital leased line interface 51A is detected,
The time slot start position of the BRI reception data detected from the slot detection synchronization pattern and the frame clock (FIG. 4)
The BRI reception data is delayed to obtain slot-corrected BRI reception data so that (b)) is synchronized (step S26). Thus, the slot-corrected BRI reception data is synchronized with the time slot (FIG. 4A) and the frame clock (FIG. 4B) of the transmission / reception data on the PRI leased line interface 31A.

When the slot correction processing is completed in the slot detection sequence of the first frame, the transmitting-side terminal adapter 1A synchronizes with the next frame clock and receives the data “66 to B” received from the PRI leased line interface 31A.
B, CC ~ "(FIG. 4 (c)) is converted into a BRI communication speed, arranged after the time slot start position, and transmitted to the BRI high-speed digital leased line interface 51a (step S3).

With the above processing, the transmitting data terminal 3A
Is transmitted via the transmission-side terminal adapter 1A, the high-speed digital leased line 5, and the reception-side terminal adapter 1B.
The receiving-side data terminal 3B can receive data according to a predetermined time slot without delay for each time slot.

When data is transmitted from the data terminal 3B on the receiving side to the data terminal 3A on the transmitting side, slot detection is performed in the same manner, and data transmission and reception can be performed in both directions.
Can be in bulk communication.

As described above, it becomes possible to perform 384 kbit / s bulk communication in which six time slots are combined on the transmission side and the reception side.

[0040]

According to the present invention, the basic interface (B
RI) In bulk communication using a plurality of high-speed digital leased lines, it has become possible to perform bulk communication combining a plurality of time slots with a PRI interface.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a bulk communication system that performs bulk communication to which a terminal adapter and a time slot distribution method of the present invention are applied.

FIG. 2 is a block diagram showing a configuration of a terminal adapter according to the present invention.

FIG. 3 is a sequence diagram showing a slot detection procedure in the bulk communication system of the present invention.

FIG. 4 is a timing chart of data transmission in the transmitting terminal adapter of the present invention.

FIG. 5 is a timing chart of data reception in the reception-side terminal adapter of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Terminal adapter 3 Data terminal 5 High-speed digital dedicated line 11 PRI line interface 12 Slot detection means 13 Bulk control means 14 BRI line interface 15 ROM 16 RAM 17 CPU 20 Control bus 31 PRI dedicated line interface 51 BRI high-speed digital dedicated line interface

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Satoru Saito 94 Nippon Telecom Technology Co., Ltd. F term in Telecom Technology (reference) 5K028 AA11 AA14 EE05 FF11 KK03 KK32 NN05 5K030 GA01 HA08 HC06 HC13 JA04 KA14 KA21 LA15 MB08 5K034 AA01 AA05 EE07 EE13 FF04 HH06 JJ13 KK04 LL07 PP03 5K03A BB07 CC05 KK

Claims (3)

[Claims] 1. A bulk communication system in which a plurality of terminal adapters supporting a primary rate interface as a data terminal side interface are connected by a bulk communication line for transmitting communication data by bundling a plurality of high-speed digital leased lines of a basic interface. A terminal adapter that has a primary group speed interface, a high-speed digital leased line interface in which a plurality of basic high-speed digital leased lines are bundled, and a slot detection synchronization pattern at the start position of a time slot of the high-speed digital leased line. And a slot detection synchronization pattern generating means for transmitting the data. 2. A bulk communication system in which a plurality of terminal adapters supporting a primary rate interface as a data terminal side interface are connected by a bulk communication line for transmitting communication data by bundling a plurality of high-speed digital leased lines of a basic interface. A terminal adapter that performs a primary group speed interface, a high-speed digital leased line interface in which a plurality of high-speed digital leased lines of the basic interface are bundled, and a slot detection synchronization pattern extracted from data received by the high-speed digital leased line. A time slot start position is calculated using the slot detection synchronization pattern, and a time slot synchronization unit that matches the time slot start position of the received data with the frame clock based on the time slot start position is provided. Do Terminal adapter that configures the bulk communication method. 3. A bulk communication system in which a plurality of terminal adapters supporting a primary rate interface as a data terminal side interface are connected by a bulk communication line for transmitting communication data by bundling a plurality of high-speed digital leased lines of a basic interface. A method of allocating a time slot in a terminal adapter to perform, wherein a terminal adapter on a data transmitting side transmits a slot detection synchronization pattern from a time slot start position to a terminal adapter on a data receiving side via a communication line; A process in which the data receiving terminal adapter receives the slot detection synchronization pattern and adjusts the time slot start position of the data received from the data transmitting terminal adapter to the time slot start position of the data transmitted to the primary rate interface; Specially consist of Time slot allocation method in a terminal adapter to.