JPH01174037A - Time division multiplexer - Google Patents

Abstract

PURPOSE:To automatically decide low-order group line communication disability and mis-connection by exchanging a check data with an opposite time division multiplexer for each high-order groups line and comparing the check data of its own station with a check data of an opposite station. CONSTITUTION:The multiplexer is provided with a high-order group line assignment table generating means 11, a check data transmission means 12, a check data reception means 13 and a check data comparison means 14. The check data transmission means 12 uses the data of the high-order group line assignment table without modification or its CRC as the check data and sends it to an opposite time division multiplexer. The check data comparison means 14 compares both the check data generated by its own station and the check data sent from an opposite station and checks whether they are coincident with each other or not. Thus, it is possible to check mis-setting of a parameter.

Description

[Detailed description of the invention] [Industrial application field] INDUSTRIAL APPLICATION This invention is utilized in the data communications field.

By allocating control channel time slots to fixed time slot positions in a multiplexed frame, the present invention achieves
Regarding an auto-framing type time division multiplexing device that allows peer communication and automatically allocates time slots from low-order group line parameters that do not include time slot allocation specification, especially when communicating when a low-order group line parameter setting error occurs. The present invention relates to a time division multiplexer capable of checking whether or not there is a positional shift in time slot allocation with respect to the division multiplexer.

〔overview〕

The present invention uses an auto-framing type time division multiplexing device to create a high-order group line-by-line allocation table in which parameters are arranged in a predetermined order from low-order group parameters to high-order group lines, and to create check data based on the table. By exchanging and comparing the parameters with the opposing time division multiplexer, it is possible to check for incorrect parameter settings.

[Conventional technology]

Conventionally, in this type of auto-framing type time-division multiplexing equipment, if a parameter is incorrect, one or more low-order group lines will suffer from a communication error, which indirectly indicates that the parameter is incorrect. There was no way to directly check for parameter errors.

[Problem that the invention seeks to solve]

The above-mentioned conventional auto-framing type time division multiplexing device has the disadvantage that it cannot check for errors in parameter settings because it does not have a means to directly check whether the parameter settings are correct or not, or if there is a time slot allocation position shift. Ta.

Incorrectly specifying parameters is a problem in itself, but errors can occur because the parameters are set manually. Also,
When changing parameters, it is almost impossible to switch the time slots of all time division multiplexers in opposing relationships at the same time.

Furthermore, the failure of communication on one or more low-order group lines due to a shift in switching timing or a shift in the time slot allocation position due to a switching failure in a part of the time division multiplexing device cannot be detected until data communication is actually performed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a time division multiplexing apparatus capable of checking correctness of parameter settings, time slot allocation positional deviation, etc. by eliminating the above-mentioned drawbacks.

[Means for solving problems]

The present invention provides a time division multiplexing apparatus that includes means for allocating control time slots to fixed time slot positions of a multiplexed frame and automatically allocating time slots from low-order group line parameters that do not include time slot allocation designation. a high-order group line-by-line allocation table creation means for creating a high-order group line-by-line allocation table in which parameters for each high-order group line are arranged in a predetermined order from the low-order group line parameters;
check data transmitting means for transmitting the data of the high-order group line-by-line allocation table as it is or the data with redundant bits added as check data to the opposing time division multiplexing device via a control channel; The present invention is characterized in that it comprises a check data receiving means for receiving the received check data, and a check data comparing means for comparing the transmitted check data and the received check data.

[Effect]

The high-order group line-by-line allocation table creation means selects the high-order group lines from the low-order group parameters, for example, in order of high and low transmission speeds.
If the transmission speed is the same, create an allocation table for each high-order group line arranged in channel order. The check data transmitting means transmits the raw data of the high-order group line-by-line allocation table or the CRC code added thereto as check data to the opposing time division multiplexing device via the control channel. The check data receiving means receives check data sent from the opposing time division multiplexing device. The check data comparison means compares the check data transmitted by the own device and the check data received from the opposite device.

Therefore, if the check data is compared and the two data do not match, it means that there is an erroneous setting or a time slot allocation position shift, and it becomes possible to check for erroneous parameter settings.

〔Example〕

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

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

The present embodiment is a time division multiplexing apparatus 10 that is equipped with a means for allocating control time slots to fixed time slot positions of a multiplexed frame and automatically allocating time slots from low-order group line parameters that do not include time slot allocation designation. a high-order group line-by-line allocation table creation means 11 for creating a high-order group line-by-line allocation table in which parameters for each high-order group line are arranged in a predetermined order from the low-order group line parameters; check data transmitting means 12 for transmitting the data to which is added as check data to the opposing time division multiplexing device via a control channel; and check data receiving means for receiving the check data sent from the opposing time division multiplexing device. 13, and check data comparison means 14 for comparing the transmitted check data and the received check data.

The feature of the present invention is that, as shown in FIG. 1, the high-order group line-by-line allocation table creation means 1 is provided with a check data transmission means 12, a check data reception means 13, and a check data comparison means 14.

Next, the operation of this embodiment will be explained with reference to FIGS. 2 and 3.

FIG. 2 is a block diagram showing a data communication system in which the time division multiplexers 10a and 10b of the embodiment shown in FIG. Connected by

FIG. 3 is an explanatory diagram showing the procedure for creating check data in this embodiment.

The low-order group parameter table 3 is stored in the time division multiplexing device 10.
This shows the parameters set for a and 10b, and assumes that the actual parameter storage image is expressed in units of several bits.

In this example, the destination connection channel number is the same as the local station channel number and does not include the bypass channel, and the parameters include transmission speed, connection line, and other (control, signal control parameters, etc.). There is.

The high-order group line-by-line allocation table creation means 11 classifies the parameters into high-order group lines 1 and 2 from the low-order group parameter table 3, and rearranges them in descending order of transmission speed. In addition, regarding the same speed, by rearranging the channels in ascending order of channel numbers, the higher order group line allocation table 4 on the line 1 side
and the high-order group line-by-line allocation table 5 on the line 2 side. These high order group line allocation tables 4 and 5 become consistent for both time division multiplexers 10a and 10b when the parameters are set normally.

Next, the check data transmitting means 12 transmits the data of the high-order group line allocation tables 4 and 5 as they are or their CRC values as check data 6 and 7 to the opposing time division multiplexing device 10a or 10b. do.

The check data receiving means 13 receives the check data 6 sent from the opposing time division multiplexing device 10b or 10a.
and 7 are received and manually inputted to the check data comparison means 14. The check data comparison means 14 compares both the check data 6 and 7 created by the own station and the check data 6 right and 7 sent from the opposite station,
Check whether there is a match.

〔Effect of the invention〕

As explained above, the present invention exchanges check data with the opposing time division multiplexing device for each high-order group line, and compares the check data of the own station with the check data of the other station, so that time slot If a deviation occurs, the check data will not be equal, which has the effect of automatically determining whether low-order group line communication is impossible or incorrect connection is caused by a parameter setting error, switching deviation, or partial switching failure.

Therefore, according to the present invention, unlike in the past, it is no longer possible to notice an abnormality until data communication is performed on the low-order group line side, and this is especially true for VAN companies that provide communication services to multiple customers. This provides a time division multiplexing device that is effective in preventing information leakage due to erroneous connections, and its effects are significant.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the main parts of an embodiment of the present invention. FIG. 2 is a block diagram showing a data communication system according to an embodiment of the present invention. FIG. 3 is an explanatory diagram showing a procedure for creating check data according to an embodiment of the present invention. 1.2...High-order group line, 3...Low-order group parameter table, 4.5...Allocation table for each high-order group line, 6.
7... Check data, 10, lQa, 10b.
. . . Time division multiplexing device, 11 . . . High-order group line specific allocation table creation means, 12 . . . Check data transmission means,
13... Check data receiving means, 14... Check data comparing means.

Claims (1)

[Claims] (1) A time division multiplexing device (10
), a high-order group line-by-line allocation table creation means (11) for creating a high-order group line-by-line allocation table in which parameters for each high-order group line are arranged in a predetermined order from the low-order group line parameters; and data as is from the high-order group line-by-line allocation table. or check data transmitting means (12) for transmitting data to which redundant bits have been added as check data to the opposing time division multiplexing device via a control channel; a check for receiving the check data sent from the opposing time division multiplexing device; A time division multiplexing device comprising: a data receiving means (13); and a check data comparing means (14) for comparing the transmitted check data and the received check data.