JPH022283A - Line terminator - Google Patents

Abstract

PURPOSE:To accomodate start-stop terminal equipments into a network corresponding to the ISDN by coding the data of a start-stop system by 48kHz multi-point sampling and converting the data into the 48kbps data of the CCITT recommendations V.110. CONSTITUTION:The data 6 sent from a terminal equipment 1 is converted into an I I/F (ISDN basic interface) 64kbps data by a line terminator 2. A start-stop data 6 is inputted to a coding section 14 in the line terminator, subjected to multi-point sampling by using 48kHz clock 7 and the result is converted into a sampling data 8. The sampling data 8 is converted into a 48kbps data format 9 of the V.110 by a speed conversion section 13 and sent to an I I/F side (network) through an I I/F adaptor 12. The I I/F data fetched into a line terminator 4 via the I I/F adaptor 12 is subjected to speed conversion by the speed conversion section 13, converted into a sampling data 8 and decoded into a start-stop data 10 by a decoding section 15 and sent to the start-stop terminal equipment 16.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a line termination device for accommodating existing terminals in a network system through an interface.

BACKGROUND ART FIG. 3 is a diagram showing the configuration of a network including a conventional line termination device. In FIG. 3, 1 and 5 are terminals, 2 and 4 are line termination devices, and 3 is a network.

Next, the operation of the above conventional example will be explained. In Figure 3, there is an IN connection between the line termination device (2, 4) and the terminal (1, 5).
The case of an S-compatible 80 Kbps digital interface will be explained as an example. Further, a logical path is set in advance between 1 and 5. The start-stop synchronization data sent from the terminal 1 is encoded by 48 kHz multi-point sampling in the line termination device 2, converted to 64 Kbps data, and sent to the network 3 as an envelope-added INS compatible & 0 Kbps digital signal. On the other hand, in the line termination device 4, the 8
Decode the 0Kbps digital signal into asynchronous data.

Problems to be Solved by the Invention However, with the above conventional line termination device, ISDN
There was a problem in that a Netcook equipped with a basic interface (abbreviation: II/F) as an external interface could not accommodate an asynchronous synchronous terminal.

The present invention is intended to solve these conventional problems.
It is an object of the present invention to provide an excellent line termination device capable of accommodating start-stop synchronous terminals in a network equipped with an engineering SDN basic interface as an external interface. In order to achieve the purpose, 1. Start-stop synchronization data up to 9600bps is transferred to 48kHz.
2. means for performing multi-point sampling and encoding at z; 2. the sampling data in accordance with CCITT Recommendation V;

Treated as 48Kbps-L-the speed data of 110,
means for converting into 64Kbps I/F data;
3. CCIT the 64Kbps data of I/F
A means for converting into 48Kbps data according to Recommendation V, 110, and a means for decoding the data based on Recommendation V, 110 above into asynchronous data are provided.
It is designed to be accommodated in the network using the F method.

Operation Therefore, according to the present invention, in a network line termination device having an I/F external interface,
The data of the start-stop synchronization method is encoded by 48kHz multi-point sampling, and the data is converted into CCITT recommendations v, iii.
By converting the data into 48 Kbps data, start-stop terminals can be accommodated in ISDN-compatible networks.

Embodiment FIG. 1 is a diagram showing the configuration of a network including a line termination device of the present invention and operational waveforms of each part, and FIG. 2 is a diagram showing the configuration of an embodiment of the present invention. In FIG. 1, 1 and 5 are asynchronous terminals, and 2 and 4 are line termination devices of the present invention. 3 is a network having an external interface using an ISDN compatible I/F.

6 and 10 are start-stop data sent from the terminal, 7 is a 48 kHz clock, 8 is sampling data, 9 is V, 110 frame 7 format of 48 Kbps data, and 10 is start-stop data sent to the terminal.

In FIG. 2, 11 is a line termination device of the present invention;
12 is an I/F corresponding unit that performs I/F processing; 13 is a speed conversion unit of V; 110; 14 is a 48kHz
Start-stop data encoding unit using z multi-point sampling, 1
5 is a decoding unit, and 16 is an asynchronous data terminal. Next, the operation of the above embodiment will be explained.

In the above embodiment, the line termination device and the network are connected in the form shown in FIG. 1, and FIG. 2 shows the internal configuration of the line termination device. It is assumed that a logical path is set in advance between terminal 1 and terminal 5. The data 6 sent from the terminal 1 is transferred to the I/F in the line termination device 2.
It is converted to 64Kbps data. To explain the operation of the line termination device using Fig. 2, start-stop data 6 is 48kHz.
Input to the z multi-point sampling encoder 14, 48kHz
Multi-point sampling is performed by clock 7 and converted into sampling data 8.

Here, the transmission speed of the start-stop data 6 does not need to be particularly specified as long as it is 9600 b/s or less.

V, 110 The sampling data 8 is converted into the 7t-mat 9 for 48KbpS data of V, 110 in the speed converter 13.
through the I/F support section 12.
Send to F side (network).

I taken in to the line termination device 4 via the network 3
The I/F data is subjected to speed conversion via the I/F corresponding section 12, V, 110 speed conversion section 13, converted to sampling data 8, decoded into start-stop data 10 at the decoding section 15, and start-stop data. It is sent to the expression terminal 16.

Effect of the invention.

As is clear from the above embodiments, the present invention is based on ■I/F
In a line termination device for a network that has as an external interface, start-stop terminals are handled as 48 Kbps data of V, 110 with multi-point sampling at 48 kHz, making it easy to accommodate start-stop terminals in ISDN-compatible networks. It has the advantage of being able to Further, if the transmission rate of the terminal is 9600 b/s or less, encoding is performed without depending on the transmission rate, which has the effect of increasing the degree of freedom when accommodating the terminal.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the network configuration including the line termination device of the present invention and the operating waveforms of each part of the device, FIG. 2 is a diagram showing the configuration of an embodiment of the present invention, and FIG. 3 is a diagram showing the configuration of a conventional line termination device. FIG. 1.5.16... Start-stop terminal, 2.4.11... Line termination device, 3... Network, 6.10... Start-stop data, 7.48kHz clock, 8 - Sampling data, 9 = - Based on CCI T T Recommendation V, 110 (48 Kbps data frame format, 12
...I I/F correspondence section, 13 V, 110 speed conversion section, 14-48kHz multi-point sampling encoding section, 1
5...Decoding section.

Claims (1)

[Claims] A means for sampling and encoding start-stop synchronization data sent from a terminal at a certain frequency;
DN basic interface B channel (64Kbps)
converting means converting the B channel data received from the network side into the encoded data, and converting the encoded data output from the converting means into start-stop synchronization data. and means for decoding the line.