JPH0685847A - Hybrid lan - Google Patents

Abstract

PURPOSE:To simplify the structure of a node, the node processing and a demultiplexer/multiplexer circuit by utilizing a code corresponding to a different group based on a block code for each service. CONSTITUTION:A code conversion section 15 of a physical module 12 applies mBnB conversion to data in m-bits generated by a packet exchange service section 13 of a data link module 11 and a line exchange service section 14 at data transmission based on an mBnB conversion table section 16 grouped for each service, generates different n-bit data from each service regardless of the same data and sends the generated data to a transmission line. Then the conversion section 15 generates m-bit data based on the mBnB conversion table section 16 at data reception to give the data to the packet exchange service section 13 and the line exchange service section 14 depending on the corresponding service at data reception.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a circuit switching service,
LA that packet transmission services are multiplexed and transmitted
Regarding N.

[0002]

2. Description of the Related Art A conventional LAN will be described with reference to FIG.

FIG. 4 is an example of a block diagram of a node arranged on a conventional LAN. In FIG. 4, 41 is a conventional node data link module, 42 is a physical module, and 43 is a PHY (Physical Layer Protocol) that performs a clock extraction function and code conversion.
ocol) section, 44 is an HRC (Hybrid Ring Control) section having a function of establishing frame synchronization, reproducing and multiplexing frames, and 45 is a section for generating and receiving packets in transferring non-isochronous data. AMAC (Asynchronous Media Access Control: Asynchr)
onous Media Access Control) section, 46 is an IMAC (Isochronous Media Access Control) section having a function of generating and receiving a channel in isochronous data transfer such as video / audio, and 47 is a data A transmission line, which is a medium for transmitting and receiving.

When data is received from the transmission line 47, the PHY section 43 of the physical module 42 performs code conversion and transfers it to the HRC section 44 of the data link module 41. H
The RC unit 44 establishes frame synchronization, notifies the IMAC unit 46 and the AMAC unit 45 of the dedicated position designated by the special signal, and each of them reads the position and performs processing.

When transmitting data, the IMAC unit 4
6. The AMAC unit 45 puts its own data in the position designated by the HRC unit 44, the HRC unit 44 multiplexes it, the PHY unit 43 performs code conversion, and transmits it to the transmission path 47.

[0006]

Problems to be solved when the LAN shown in FIG. 4 is used will be described.

The conventional LAN separates the time-division multiplexed data at the time of data reception and allocates them to the AMAC part and IMAC part by a special signal, and at the time of data transmission, the transmission data is time-division multiplexed and transmitted. Was there. therefore,
In addition to requiring a large field as a special signal,
Even in the case of transmitting and receiving only the AMAC data that does not need to be multiplexed, the same process must be performed, which complicates the node structure and the process in the node. Furthermore, it is impossible to mix nodes that handle only AMAC data without conventional multiplexing.

The present invention focuses on this problem, and in addition to a node having a function of time division multiplexing / demultiplexing at the time of data transmission / reception, a node which does not have a multiplexing / demultiplexing function also transmits / receives only conventional AMAC data. It is an object of the present invention to provide a hybrid LAN that can be mixed and that can simplify a demultiplexing and multiplexing circuit.

[0009]

In order to solve the above problems, the present invention does not require a special signal, and in addition to a code conversion unit, a m-bit data at the time of data transmission is provided in a conventional physical module. An mB having an mBnB conversion table grouped for each service, which is used to convert n-bit data into n-bit data and m-bit data when receiving data.
An nB conversion table unit is provided.

[0010]

According to the present invention, the mBnB conversion table of the mBnB conversion table unit is grouped for each service, and m bits of data are n bits when transmitting data.
It is used to convert n-bit data to m-bit when receiving data.

The code conversion unit performs mBnB conversion of m-bit data generated by the packet switching service unit or the circuit switching service unit of the data link module at the time of data transmission, based on the mBnB conversion table, and outputs n-bit data. Generated and sent to the transmission line, even when receiving data, m
MBnB conversion is performed by the BnB conversion table, m-bit data is generated from the n-bit data received from the transmission path, and is transferred to the packet switching service unit or the circuit switching service unit of the data link module by the corresponding service.

This simplifies the demultiplexing circuit.

[0013]

Embodiments of the present invention will now be described with reference to the drawings.
The details will be described.

In FIG. 1, reference numeral 12 is a physical module of a hybrid LAN which is an embodiment of the present invention.

In this physical module 12, 15 is a code conversion unit for performing mBnB conversion, and 16 is a code conversion unit 15.
Is an mBnB conversion table unit including an mBnB conversion table grouped for each service, which is used when performing mBnB conversion.

Reference numeral 11 is a data link module for receiving data from the physical module. In this data link module 11, 13 is a packet switching service unit having a function of generating and receiving packets in the transfer of non-isochronous data, and 14 is a channel generation and reception in the transfer of isochronous data of video and audio. It is a circuit switching service unit having a function of performing. Further, 17 is a transmission line through which transmitted / received data flows.

In FIG. 2, reference numeral 21 is a block diagram of a hybrid LAN which is an embodiment of the present invention.

As nodes on the hybrid LAN 21, 22 is an AMAC / IMAC node for transmitting / receiving non-isochronous data / isochronous data, and 23 is an AMAC node for transmitting / receiving only non-isochronous data. In both, 22a and 23a are data link modules,
b and 23b are physical modules.

In the AMAC / IMAC node 22,
22c is an AMAC (Asynchronous Mem) having a function of generating and receiving a packet in the transfer of non-isochronous data.
diaAccess Control) section, 22d is an IMAC (Isochronous Media Access Control) section having a function of generating and receiving a channel in isochronous data transfer of video / audio.
22e is an SMUX (Service Multiplexer: Service Multi) having a function of establishing frame synchronization and reproducing a frame.
plexer) part, 22f is the code conversion part 15 and mBn of FIG.
A PHY (Physical Layer Protocol) unit including a B conversion table unit 16 and having a clock extraction / bit reproduction function. In the AMAC node 23, 23c is 22c
The AMAC section 23d has the same function as the above, and the PHY section 23d has the same function as 22f.

In FIG. 3, reference numeral 31 is an 8B10B conversion table when m = 8 and n = 10 as an example of mBnB conversion. 32 is the packet switching service unit 1 of FIG.
A corresponding block of 2 ⁸ packet switching service data used by 3 and 10-bit data after each 8B10B conversion, 33 is a control code for the packet switching service used by the packet switching service unit 13 of FIG. Is a corresponding block of 8 bits / 10 bits.

Further, 34 is the circuit switching service unit 1 of FIG.
8 bits of data for circuit switching service used by 4 /
Corresponding block of 10 bits, 35 is a corresponding block of 8 bits / 10 bits of the control code for the circuit switching service used by the circuit switching service unit 14 of FIG.

Data transmission / reception in the hybrid LAN having these configurations will now be described with reference to FIGS. 1 to 3.

In FIG. 2, the AMAC / IMAC node 22 transmits the isochronous data "00000000" for the circuit switching service, which is the IMAC data.
3 receives. The internal processing of each node at this time is shown below. (1) IMAC of the AMAC / IMAC node 22 of FIG.
The unit 22d generates a channel, transfers the data "00000000" to the SMUX unit 22e, the SMUX unit establishes frame synchronization and reproduces the frame, and transfers the data to the PHY unit 22f. (2) In the PHY unit 22f, the code conversion unit 15 in the physical module 12 in FIG.
6, in this case, the 8B10B conversion table 31 of FIG. 3 is read out. (3) Circuit switching service data 3 on the table of FIG.
10-bit data "1010101" corresponding to "00000000" of 4
010 ", parallel / serial conversion is performed, and the result is sent to the transmission line 17 in Fig. 2. (4) When the AMAC node 23 in Fig. 2 receives this,
The code conversion unit 15 of FIG. 1 reads the mBnB conversion table of the mBnB conversion table unit 16, and in this case, the data “1010101010” may belong to the circuit switching service data 34 by the 8B10B conversion table 31 of FIG. Since it is known, it is sent to the transmission line 17 as it is.

Further, in FIG. 2, AMAC / IMAC
The node 22 transmits the non-isochronous data "00000000" for the packet switching service, which is the AMAC data, and the AM
It is assumed that the AC node 23 receives. The internal processing of each node at this time is shown below. (1) AMAC of AMAC / IMAC node 22 of FIG.
The unit 22c generates a channel, transfers the data "00000000" to the SMUX 22e, the SMUX unit establishes frame synchronization and reproduces the frame, and transfers it to the PHY unit 22f. (2) In the PHY unit 22f, the code conversion unit 15 in the physical module 12 in FIG. 1 uses the mBnB conversion table of the mBnB conversion table unit 16 in this case, 8B in FIG.
The 10B conversion table 31 is read. (3) 10-bit data "0" corresponding to "00000000" of the packet switching service data 32 on the table of FIG.
0100100 10 ", parallel / serial conversion,
It is sent to the transmission line 17 of FIG. (4) When the AMAC node 23 of FIG. 2 receives this,
The code conversion unit 15 of FIG. 1 reads out the mBnB conversion table of the mBnB conversion table unit 16, and in this case, this data “0010010010” is converted into the packet switching service data 32 by the 8B10B conversion table 31 of FIG.
This table shows that "00000
000 "and passes this data to the packet switching service unit 13 of FIG. 1, that is, the AMAC unit 23c of FIG. 2 and at the same time, this data is for AMAC.
Notify that it is data. (5) Upon receiving the packet switching service data, "00000000", the AMAC unit 23c performs processing based on this data and the notified content.

Further, in FIG. 2, AMAC / IMAC
The processing when the node 22 receives the control code "1111111111" for the packet switching service, which is the AMAC control code, will be described below. (1) When the PHY unit 22f of the AMAC / IMAC node 22 of FIG. 2 receives "1111111111", the code conversion unit 15 of FIG.
Reads the mBnB conversion table of the mBnB conversion table unit 16, and in this case, the 8B10B conversion table 31 in FIG. 3 shows that this data "1111111111" is the packet switching service control code 33. The corresponding "11111111" is converted to the corresponding "11111111", and this data is transferred to the SMUX unit 22e of FIG. 2 and at the same time, this data is used for AMAC and that it is a control code. (2) The SMUX 22e that has received "11111111" transfers the data to the AMAC unit 22c according to the notified contents at the same time. (3) The AMAC unit 22c performs processing based on the data from the SMUX unit 22e.

As described above, according to the present embodiment, by using the codes corresponding to different groups of block codes for each service, it is possible to simplify the node structure, the processing at the node, and the demultiplexing / multiplexing circuit. .

Further, by this, in addition to the node having the function of time division multiplexing / demultiplexing at the time of data transmission / reception,
It is possible to send and receive only conventional AMAC data, and to mix nodes that do not have the multiplexing / demultiplexing function.

The present invention is not limited to the above embodiments, and various modifications can be made based on the spirit of the present invention, and these modifications are not excluded from the scope of the present invention.

[0029]

As described above, according to the present invention, the following effects can be obtained.

By using codes corresponding to different groups of block codes for each service, it is possible to simplify the structure of the node, the processing at the node, and the demultiplexing / multiplexing circuit.

In addition to the node having the function of time division multiplexing / demultiplexing at the time of data transmission / reception, the node for transmitting / receiving only the conventional AMAC data and having no multiplexing / demultiplexing function can be mixed, which is extremely effective in practice. .

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a physical module of a node of a hybrid LAN and its related module in the present invention.

FIG. 2 is a configuration diagram showing an embodiment of a hybrid LAN according to the present invention.

FIG. 3 is a diagram showing an 8B10B conversion table in the embodiment of the present invention.

FIG. 4 is a block diagram of a node arranged on a conventional LAN.

[Explanation of symbols]

 11 data link module 12 physical module 13 packet switching service unit 14 circuit switching service unit 15 code conversion unit 16 mBnB conversion table unit 17 transmission line 21 hybrid LAN 22 AMAC / IMAC node 22a data link module 22b physical module 22c AMAC unit 22d IMAC unit 22e SMUX unit 22f PHY unit 23 AMAC node 23a Data link module 23b Physical module 23c AMAC unit 23d PHY unit 31 8B10B conversion table 32 Packet conversion service data 33 Packet switching service control code 34 Circuit switching service data 35 Circuit switching service Control code 41 Data link module 42 Physical module 43 PHY section 44 HRC section 45 A AC part 46 IMAC portion 47 transmission line

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Osamu Tanaka 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (4)

[Claims] 1. Grouping for each service, which is used when converting m-bit data to n-bit during data transmission and n-bit data into m-bit during data reception,
Based on the mBnB conversion table, the mBnB conversion table unit including the mBnB conversion table and the m-bit data generated by the packet switching service unit or the circuit switching service unit of the data link module at the time of data transmission are converted into the mBnB conversion table.
nB conversion is performed, n-bit data is generated and transmitted to the transmission line, and at the time of data reception, mBnB conversion is performed by the mBnB conversion table, and m-bit data is generated from the n-bit data received from the transmission line. A physical conversion module for delivering the packet to the packet switching service unit or the circuit switching service unit of the data link module according to a corresponding service. 2. A PHY (Physica) including the physical module according to claim 1 and having a clock extraction / bit reproduction function.
l Layer Protocol) part and AMAC (Asynchronous Media Access) that has the function of generating and receiving packets in the transfer of non-isochronous data
Control) section, the PHY section performs mBnB conversion when receiving data, and based on that, if the AMAC section is data for its own service, the processing is continued, otherwise, the PHY section does not perform processing.
AMA characterized by transmitting on a transmission line via a communication unit
C node. 3. A PHY unit according to claim 2, an SMUX (Service Multiplexer) unit having a function of establishing frame synchronization and reproducing a frame, and a channel generation / reception in isochronous data transfer of video / audio. IMAC (Isochronous Media)
AMAC / IM including an Access Control) unit and the AMAC unit according to claim 2.
AC node. 4. The AMAC node according to claim 2 and claim 3.
A plurality of the described AMAC / IMAC nodes are mixed, and between AMAC nodes, between AMAC / IMAC nodes,
A hybrid L characterized by arbitrarily transmitting and receiving data between an AMAC node and an AMAC / IMAC node
AN.