JPH0744742B2 - Converter for TDMA and TDM data - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is used for a TDMA data and TDM data converter for satellite communication. In particular, it is a device installed in hygiene, and in order to realize mutual channel switching between TDMA (Time Division Multiple Access) data and TDM (Time Division Multiplex) data in baseband signal processing, TDMA data is formatted in TDM data format. The present invention relates to a format converter circuit for converting to.

〔Overview〕

According to the present invention, in a TDMA data and TDM converter, TDMA data is stored in a data memory, output pattern data from the ground is stored in an output pattern memory, and this output pattern data is read out and used as a read address in a data memory By reading the contents as TDM data, the TDMA data can be converted into TDM data having different formats, and switch control between TDMA data and TDM data having different formats can be performed.

[Conventional technology]

FIG. 5 is a block diagram of a conventional TDMA switch circuit.

FIG. 6 is a block diagram of a conventional TDM switch circuit.

Conventionally, baseband TDMA data has been channel-switched between TDMA data having the same format. In Figure 5, n ₁ baseband TDMA
The data 18 ₁ is channel-switched by the TDMA switch circuit 27, the data rate is changed, and the data of each channel is different m ₁ baseband TDMA data 19 ₁
Is output as.

Further, in FIG. 6, n ₂ baseband TDM data 21 ₁ is processed by a TDM switch circuit 28 that performs data rate conversion and channel switching, and m ₂ TDM data 22 of baseband different from the input. Output as ₁ .

[Problems to be solved by the invention]

However, such a conventional TDMA switch circuit and TD
Since the M switch circuit can handle only data having the same format, there is a drawback in that switch control between data having different formats for TDMA data and TDM data is impossible.

That is, in the past, all channels were tried to be converted into different formats at once, but the data rate per channel transmitted in the TDMA format is TDM.
Faster than format (eg TDM 64K
bps ~ 2Mbps, TDMA was at least 6Mbps), so it was difficult to collectively convert each channel. Further, in the TDMA format, there is also a difference in the transmission rate for each channel, and it is difficult to convert all channels at once.

The present invention solves the above drawbacks, and provides a TDMA data and TDM data converter that can convert TDMA data into TDM data of different formats and that can perform switching control between different TDMA data and TDM data. The purpose is to

[Means for solving problems]

According to the present invention, a plurality of burst-structured frames form one multiframe, at least one preamble burst is arranged at the beginning of each frame, and a plurality of traffic bursts are arranged subsequently. The preamble burst establishes frame synchronization. Traffic burst is used for transmission and control information transmission, and a traffic burst consists of preamble data for synchronization establishment and control information transmission for each traffic burst, TDMA data in which multiple channels for information transmission are arranged, and a series of multiple frames. One multi-frame is composed, a synchronization word for establishing synchronization is arranged at the beginning of each frame, a multi-frame message area for transmitting control information is arranged in units of predetermined time slots, and information transmission is performed in other time slots. TDM with channels for
TDMA data and TDM for format conversion between data
In the data converter, a data memory in which the input TDMA data is stored, a write address generation circuit for giving a write address to the data memory to write the TDMA data, and for converting the TDMA data into TDM data. A read address generating circuit for giving a read address to the data memory based on output pattern data giving a read address written in the output order of the data memory and reading the content as TDM data. Is an output pattern memory in which the output pattern data is stored, an output pattern write address generation circuit for giving a write address to the output pattern memory to write the output pattern data, and a read address in the output pattern memory. An output pattern that gives the contents and outputs as the read address of the data memory. Characterized in that it comprises a down read address generating circuit.

[Action]

The write address generation circuit gives a write address to the data memory and writes the input TDMA data of the base band to the data memory. The output pattern write address generation circuit of the read address generation circuit gives the write address to the output pattern memory and writes the input output pattern data into the output pattern memory. The output pattern read address generation circuit gives a read address to the output pattern memory to read the contents, and gives it to the data memory as a read address to read the TDM data.
By the above operation, TDMA data can be converted into TDs with different
It can be converted into M data and enables switch control between TDMA data and TDM data of different formats.

An example of the TDMA format is shown in FIG. 7 and an example of the TDM format is shown in FIG. 8 to explain the format conversion.

The TDMA data has a burst structure, and one multiframe is composed of a plurality of frames. One frame is composed of one or two reference bursts and a plurality of traffic bursts, and the reference burst includes preamble data for establishing synchronization,
There is control data in which control information necessary for TDMA communication is written. Further, the traffic burst includes preamble data, control data, and information data including transmission information such as voice data or transmission data. This information data is installed in the time slot of each channel.

Here, the preamble data is truncated at the time when the establishment of synchronization is confirmed, and the control data and the information data are input to the converter that performs format conversion. Original TDMA
In the format, the channel data amount is more than 16 bytes, but in this example, each channel of the original information data is
It is subdivided into 16-byte units and each is given a channel number.

Next, the TDM data is configured as shown in FIG. 8, and one multi-frame is continuously arranged from 1 frame to 64 frames. One frame consists of 64 bytes, a synchronization word (UW) for synchronization establishment is placed at the beginning, followed by 1 to 15 channels that carry information data, and then control information. Multi-frame message (MFM) is placed, and the next 16 to 30 channels are placed. In this way, the multi-frame message is arranged in units of 15 channels, and one multi-frame message has 16
It has become a byte.

The converter of the present invention sequentially writes the received TDMA data in the data memory. However, in the embodiment of the present invention, the area for writing the control data and the information data is divided and used in advance in order to reduce the memory size. Two frames of TDMA data are written in the data memory. The control data is output to the time slot of the multi-frame message of each frame of the TDM format, and the information data is output to the time slot of the channel corresponding to the information data of the TDM format. The read address for the data memory in which the TDMA data is written is written in the read address generation circuit in the order of output. The read address written in this output order is the output pattern.
This output pattern is stored in the output pattern memory,
According to the present invention, the contents of the output pattern memory are rewritable so that flexible channel allocation can be performed.

In the present invention, as shown in FIG. 9, the TDMA format is subdivided, the same channel is subdivided into 16-byte units, and the subdivided 16-byte units are regarded as one channel for processing. . Even if one channel is subdivided in this way, it is also subdivided when decrypting the data.
When the channels embedded in the format are recombined into the TDMA format, the state of the original channel can be restored, so there is no loss even if subdivided. This enabled the format conversion from TDMA to TDM.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings. First
FIG. 1 is a block diagram of a TDMA data and TDM data converter according to an embodiment of the present invention. FIG. 2 is a block diagram of a read address generation circuit of the TDMA data and TDM data converter of the present invention.

In FIG. 1 and FIG. 2, a TDMA data and TDM data converter comprises a serial-parallel converter 8 for converting input baseband TDMA serial data 1 into TDMA parallel data 2, and a TDM parallel data 3 for TDM. Parallel-to-serial converter 10 for converting to serial data 4
And a data memory 9 for storing TDMA parallel data 2
Then, the write address 5 is given to the data memory 9 to write the TDMA parallel data 2 into the write address generating circuit 11, and the read address 6 is given to the data memory 9 based on the input output pattern data 7 and its contents are TDM. Parallel data 3
And a read address generation circuit 12 for reading.

Here, the feature of the present invention is that the read address generation circuit 12 writes the output pattern data 7 by giving the output pattern memory 13 in which the output pattern data 7 is stored and the write address 16 to the output pattern memory 13. Output pattern write address generating circuit 14 and a read address 17 in the output pattern memory 13.
And an output pattern read address generation circuit 15 for reading the contents thereof.

The operation of the TDMA data and TDM data converter thus configured will be described. FIG. 3 is a diagram showing the channel switching operation of the TDMA data and TDM data converter of the present invention. FIG. 4 shows TDMA data and TDM of the present invention.
It is a block configuration diagram of a switch device to which a data converter is applied.

In FIG. 1, baseband TDMA serial data 1
Are converted into 8-bit parallel data in the serial / parallel converter 8, sequentially written from the initial address of the data memory 9 according to the write address 5 output from the write address generation circuit 11, and stored for 2 frames. .
According to the read address 6 generated by the read address generation circuit 12 when the data for one frame is stored, the TDM
The parallel data 3 is read out. Read at this time
The TDM parallel data 3 must have the same format as the TDM data. Therefore, the read address generation circuit
12 has the structure shown in FIG.

In FIG. 2, the output pattern data 7 sent from the ground is sequentially written in the output pattern memory 13. At this time, the output pattern write address generation circuit 14 increases in order from the zero address, and the addresses for two frames are generated.
The output pattern data 7 is also sent as data for two frames,
The content of the data indicates the address of the data memory 9. The output pattern data 7 written in the output pattern memory 13 is sequentially read from the address 0 according to the read address 17 generated by the output pattern read address generation circuit 15, and used as the read address 6 of the data memory 9.

Therefore, the output pattern data 7 is from TDMA data to TDM.
It was created in consideration of the prescribed rules for conversion to data, and is the core of this TDMA data and TDM data converter. The output pattern data 7 is read in the order, and the TDM pattern data 3 having the format of the TDM data is again parallel-serial converted into TDM serial data 4, which is input to the TDM switch circuit in the next stage.

FIG. 3 shows a standard format conversion operation. TDMA
As for the data, n bytes of data 26, 26 ', 26 "of the same channel are continuously inserted. On the other hand, in the case of TDM data, if the data of the same channel is input one byte at a fixed interval, The conversion is performed as shown in FIG.

As shown in Fig. 4, n ₁ baseband TDMA data
18 ₁ is a TDMA / TDM converter 24 and n ₁ baseband TD
Converted to M data 18 ₂ . The TDM switch circuit 23 has n ₁ T
DM data 18 ₂ and n ₂ baseband TDM data 21 ₁
To perform switch control, and output m ₁ TDM data 19 ₂ and m ₂ TDM data 22 ₂ . m ₁ TDM data 19 ₂
Is converted into m ₁ TDMA data 19 ₃ by the TDM / TDMA converter 25 and output. Here, the TDM / TDMA converter 25 is also TDMA
-It can be realized in the same manner as the TDM converter 24.

〔The invention's effect〕

As described above, the present invention can convert TDMA data into TDM data of different formats, and has an excellent effect of enabling switching control between TDMA data and TDM data of different formats.

In the case of TDMA data, the format may be changed by changing the time burst plan, but even in that case, there is an advantage that it can be sufficiently handled by rewriting only the output pattern data and flexible channel allocation becomes possible.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a TDMA data and TDM data converter according to an embodiment of the present invention. FIG. 2 is a block diagram of a read address generation circuit of the TDMA data and TDM data converter according to the present invention. FIG. 3 is a diagram showing the operation of the TDMA data and TDM data converter of the present invention. FIG. 4 is a block configuration diagram of a switch device to which the TDMA data and TDM data converter of the present invention is applied. FIG. 5 is a block diagram of a conventional TDMA switch circuit. FIG. 6 is a block diagram of a conventional TDM switch circuit. FIG. 7 is a diagram showing a format structure of TDMA data. FIG. 8 is a diagram showing the format structure of TDM data. FIG. 9 is a diagram for explaining the subdivision of the information channel of the TDMA format. 1 ... TDMA serial data, 2 ... TDMA parallel data, 3 ... TDM parallel data, 4 ... TDM serial data, 5,16 ... write address, 6,17 ... read address, 7 ... output pattern Data, 8 ... Serial-parallel converter, 9 ... Data memory, 10 ... Parallel-to-serial converter, 11 ... Write address generation circuit, 12 ... Read address generation circuit, 13 ... Output pattern memory, 14 ... … Output pattern write address generator, 15 …… Output pattern read address generator, 18 ₁ …… n ₁ baseband TDMA data, 18 ₂ …… n ₁ baseband TDM data, 19 ₁ , 19 ₂
…… m ₁ baseband TDMA data, 19 ₃ …… m ₁ baseband TDM data, 21 ₁ …… n ₂ baseband TDM data, 22 ₁ , 22 ₂ …… m ₂ Baseband TDM data, 23, 28 …… TDM switch circuit, 24 …… TDMA / TDM converter, 25 …… TDM / TDMA converter, 26, 26 ′, 2
6 ″ …… 1 byte data in the same channel, 27 …… T
DMA switch circuit.

Claims (1)

[Claims] 1. A plurality of frames having a burst structure constitute one multiframe, at least one preamble burst is arranged at the beginning of each frame, and a plurality of traffic bursts are arranged subsequently. The preamble burst is a frame synchronization. Used for establishment and control information transmission, traffic bursts are preamble data for synchronization establishment and control information transmission for each traffic burst, TDMA data in which multiple channels are arranged for information transmission, and a series of multiple frames. Composes one multiframe, a synchronization word for establishing synchronization is arranged at the beginning of each frame, a multiframe message area for transmission of control information is arranged in units of predetermined time slots, and information is stored in other time slots. TD with channels for transmission
Data memory that stores the input TDMA data in the TDMA data and TDM data converter that performs format conversion between M data (9)
And a write address generation circuit (11) for giving a write address to the data memory to write the TDMA data, and a read address written in the output order of the data memory for converting the TDMA data into the TDM data. A read address generation circuit (12) for giving a read address to the data memory based on the output pattern data to be given and reading the content as TDM data, wherein the read address generation circuit stores the output pattern data. An output pattern memory (13), an output pattern write address generation circuit (14) for giving a write address to the output pattern memory to write the output pattern data, and a read address for the output pattern memory to give its contents. And an output pattern read address generation circuit (15) for outputting as a read address of the data memory. Converter of TDMA data and TDM data to be.