JPH04154337A - Communication node equipment for loop type lan - Google Patents

Abstract

PURPOSE:To simplify the band allocation by determining in advance a multilayer transmitting/receiving data bus by dividing it into one for burst data and one for TDM data, selecting the corresponding bus group and multiplexing and separating it. CONSTITUTION:In a burst access adaptor part 3, an allocation layer n-m (m denotes the number of allocation layers of TDM data) of burst data designated by a setting part from in a receiving bus 13 of (n) layers is selected by a layer selecting part 31, multiplexed by a multiplexing part 32 and sent to a burst access part 33. Also, as for the TDM data, in a TDM access adaptor part 2, an allocation layer (m) of the TDM data designated by a setting part 26 from in the receiving data bus 13 of (n) layers is selected by a layer selecting part 21, multiplexed by a multiplexing part 22 and sent to a burst access part 23.

Description

[Detailed Description of the Invention] [Summary] Separation of burst data and TDM data mixed in a frame from the multilayer data bus regarding a loop-type LAN communication notebook device having a multilayer bus in which multiplexed data is layer-separated. For the purpose of simplifying bandwidth allocation to multilayer data buses and multilayer data buses, the multilayer reception data buses connected to the LAN via repeaters and separation units are A layer selection unit that simultaneously selects data over a plurality of predetermined layers corresponding to a burst data area, a multiplexing unit that multiplexes the selected burst data, and controls input/output of the multiplexed burst data. a burst access section; a separation section that separates burst data output from the burst access section into predetermined multiple layers of a multilayer transmission data bus and sends it to the L A N via a multiplexing section and a repeater; Divided T within one frame of the bus
A layer selection unit that simultaneously selects data of one or more predetermined layers corresponding to a DM data head area, a multiplexing unit that multiplexes the selected TDM data, and an input/output control of the multiplexed TDM data. TDM data output from the iTDM access unit and the iTDM access unit are separated and sent to one or more predetermined layers of the transmission data bus, and sent to the LAN via the multiplexing unit and repeater. It consists of a separating section.

[Industrial Application Field] The present invention relates to a loop-type LAN communication node device, and more particularly to a loop-type LAN communication node device having a multilayer bus in which multiplexed data is layer-separated.

In a loop-type LAN system, there is isochronous information such as voice and synchronous continuous data, and burst information such as file transfer, in which the amount of data fluctuates over time, in the network.

The former type of isochronous information can be accommodated in TDM type LAN systems, and the latter type of bursty information can be accommodated in LAN systems such as CS MA/CD type, but as the number of types of terminals connected to LAN increases, There is a need for a composite system that can centrally accommodate information with different properties in the same network.

[Conventional technology]

FIG. 3 shows the frame format used in the frame division method proposed as such a composite method.
■TDM the frame? The TDM area is divided into an Ii area and a burst area, and the TDM area is allocated using a time slot method, and the burst area uses a fixed area of one frame in competition with the TDM area using the Pakento method.

A conventional example of a communication node device that performs loop-type LAN communication using such a frame division method frame former is shown in FIG. 4, where 1 indicates a loop-type LA.
A multilayer reception data bus 13 connected to N (not shown) via a repeater 11 and a separation unit 12, and a repeater 16
and the multilayer transmission data bus 14 connected via the multiplexing unit 15, the common unit 40 separates the bands of burst data and TDM data from the data of the reception data bus 13 and outputs them. A multimedia access control unit 33 allocates data and bandwidth to the transmission data bus 14; A burst access unit 23 sends TDM data from the multimedia access control unit 40 to the TDM terminal 4, and transmits burst data from the TDMfi terminal 4 to the multimedia access control unit. 40.

In the operation of the conventional example with such a configuration, frame data (see FIG. 3) containing burst data and TDM data from the LAN is passed through the repeater 11 and separated into equal bands by the separation unit 12. The signals are equally applied to the reception data bus 13.

The received data on this receive data bus is sent to the multimedia access control section 40 and separated into burst data and TDM data, and the burst access section 33 and TDM data are separated into burst data and TDM data.
The data is sent to the DM access unit 23, and further sent to the burst terminal 4 and the TDM terminal 5, respectively.

On the other hand, the burst data from the burst terminal 4 and the TDM data from the TDM terminal 5 are sent to the multimedia access control section 40 via the burst access section 33 and the TDM access section 23, respectively. A data band is appropriately allocated to the transmission data bus 14.

Then, the composite data on the transmission data bus 14 is multiplexed in a frame-divided form as shown in FIG.

[Problem to be solved by the invention]

However, in the case of such a conventional example, the multimedia access control unit 40 separates the mixed data from the reception data bus 13 into burst data and TDM data, and also separates the burst data and TDM data generated at the own station. Although TDM data is assigned to the transmission data bus 14 by band, there is a problem in that the control is very complicated.

Therefore, the present invention provides a loop-type LAN communication node device having a multilayer bus in which multiplexed data is layer-separated, in which burst data and TDM data mixed in a frame are separated from the multilayer data bus, and The purpose is to make it easy to allocate bandwidth.

[Means for Solving the Problems] FIG. 1 shows the principle of a loop-type LAN communication node device according to the present invention for solving the above-mentioned problems. A multilayer reception data bus 13 connected to the
(2) a layer selection unit 31 that simultaneously selects data across a predetermined plurality of layers corresponding to burst data areas multiplexed within a frame; and a multiplexing unit 32 that multiplexes the selected burst data; A separation unit 34 separates burst data output from the burst access unit 33 and sends it to predetermined multiple layers of the multilayer transmission data bus 14, and corresponds to the divided TDM data area within one frame of the reception data bus 13. A layer selection unit 21 that simultaneously selects data in one or more predetermined layers, a multiplexing unit 22 that multiplexes the selected TDM data, and a TDM access unit 23 that separates the TDM data output from the TDM data and converts it into multilayer transmission data. The device is characterized in that it includes a separating section 24 that sends out to one or more predetermined layers of the bus 14.

[For production]

In FIG. 1, the present invention does not use a format that is divided into a TDM fiI area and a burst area table in one frame as shown in FIG. The format is focus multiplexed or octet multiplexed, and the receive data bus 13 and transmit data bus 14 are allocated in advance to burst data and TDM data.

Then, from the burst data and TDM data separated by the separation unit 12 and sent to the reception data bus 13, only the burst data bus 13 is selected by the layer selection unit 31 as shown by the solid line, and the TDM data is selected by the layer selection unit 31 as shown by the solid line. No data is selected, and the burst data is sent to the multiplexing section 32, multiplexed, and sent to the burst access section 33 as before.

Further, the TDM data sent to the reception data bus 13 is selected by the layer selection unit 21 as shown by the solid line (burst data is not selected as shown by the dotted line), and is sent to the multiplexing unit 32 where it is multiplexed. TDM access section 2 as before
Sent to 3.

Furthermore, the burst data from the burst access unit 33 is separated by a separation unit 34. The separation operation in this case is to send the data to a plurality of predetermined layers of the multilayer transmission data bus 14 for burst data.

On the other hand, TDM data from the TDM access unit 23 is separated by a separation unit 24. The separation operation in this case is to transmit data over a plurality of predetermined layers allocated in advance for TDM data on the multilayer transmission data bus 14.

In this way, the layer selection unit 3 for the burst access unit 33
1, a burst access adapter section 3 consisting of a multiplexing section 32, and a demultiplexing section 34;
By providing the M access adapter section 2, it becomes possible to access the multilayer data bus with a simpler configuration than a conventional multimedia access control section.

〔Example〕

FIG. 2 shows the loop type LAN according to the present invention shown in FIG.
This figure shows the actual male side of the communication node device.In this embodiment, the multilayer reception data bus 13 and the multilayer transmission data bus 14 shown in FIG. and a line 1 for a transmission request signal through which an access signal from the TDM access unit 23 passes.
There are 9.

Further, in this embodiment, in the common section 1, the repeater 1
1.16 and focus separation section (octet separation section) 12,
In addition to the bit multiplexing unit (octet multiplexing unit) 15, a frame synchronization unit 18 for the bit separation unit 12 is provided, and a transmission/reception control unit 1 with the multilayer transmission/reception data bus 13 (14) is provided.
There are 7.

Furthermore, in the burst access adapter section 3, the setting section 3
6 is provided, which controls the layer selection section 31 and the multiplexing section 32 to instruct which bus in the reception data bus 13 to select and in which order to multiplex, and also controls the demultiplexing section 34. It instructs which bus of the transmission data bus 14 to select to separate burst data.

Further, in the TDM access adapter section 2, a setting section 26
is provided, which controls the layer selection section 21 and the multiplexing section 22 to instruct which bus in the reception data bus 13 to select and in what order to multiplex the data, and also controls the separation section 24 to transmit data. It instructs which bus of the data bus 14 to select to separate TDM data.

Note that these setting sections 36 and 26 are for the loop type LA to which they belong.
N may be set in common for all communication node devices, or a fiI area for controlling the setting section 36.26 may be provided in the frame format so that the communication node device on the transmitting side and the receiving side The burst data bus and the TDM data bus may be determined by the communication node device.

Furthermore, in this embodiment, the burst access section 33 includes a packet analysis section 33a that analyzes whether or not a packet as burst data is addressed to the own station based on the output of the multiplexing section 32.
, a switch SW1 controlled by this packet analysis section 33a, a reception buffer 33b connected to one switching contact of the switch SWI, a register buffer 33c connected to the other switching contact of the switch SW2, and this register buffer. a transmission control unit 33d controlled by the transmission control unit 33c; a switch SW2 controlled by the transmission control unit 33d and having one switching contact connected to the register buffer 33C; and a transmission buffer 33e connected to the other switching contact of the switch SW2. , buffers 33b and 33
e and an external interface unit 33f that exchanges data with the burst terminal 4.

Note that the switch SWI receives data from the multiplexer 32,
The switch SW2 is connected to send data to the separation unit 34, and the transmission control unit 33d is connected to the register buffer 33.
In addition to the transmission buffer 33e, the transmission request signal is sent to the transmission request line 19 under the control of the transmission buffer 33e.

Further, the TDM access section 23 receives the TDM access section 23 from the multiplexing section 22.
A reception buffer 23a that receives DM data and a separation unit 24
A transmission buffer 23b that transmits TDM data to the TDM terminal 5, a generation unit 23c that generates transmission and reception timing for these buffers 23a and 23b, and an external interface unit 23d that exchanges data between the buffers 23a and 23b and the TDM terminal 5.
It is made up of.

Next, the operation of the above embodiment will be explained.

Bit-multiplexed input data from a LAN transmission path is separated into n layers by a bit separator 12 via a beater 11, and sent from a transmission/reception controller 17 to an n-layer reception data bus 13.

Then, in the burst access adapter section 3, the layer selection section 31 selects the burst data allocation layer n-m (m is the number of TDM data allocation layers) specified by the setting section 36 from the n-layer reception data bus 13. is selected, multiplexed by the multiplexing section 32, and sent to the burst access section 33.

In the burst access unit 33, the packet analysis unit 33a determines whether or not the burst data is a packet addressed to the own station, and when the burst data is addressed to the own station, the switch SW1 is switched to the reception buffer 33b side, and the reception buffer 33
Burst data is sent to the burst terminal 4 via the external interface section 33f and the external interface section 33f, but if the packet is not addressed to the own station, the switch SWI is sent to the register buffer 33c.
Switch control to the side of

At this time, in the transmission control unit 33d, the transmission buffer 33e
determines whether burst data is stored from the parse terminal 4 or burst data is stored in the register buffer 33c, and controls the switch SW2 to select the one that stores the data. The burst data generated at the burst terminal 4 of the own station is sent to the transmission request line 19.

The output burst data of this switch SW2 is transmitted to the setting section 3.
The data is sent to the transmission data bus 14 of a predetermined nm layer (when the transmission and reception allocation layers are the same) by the separation unit 34 controlled by the transmission data bus 6.

At this time, the transmission control unit 33d sends the transmission request signal to the line 19 to send out the nost data from its own station as a transmission request signal.
The data is controlled to be sent to the transmission data bus 14.

Regarding TDM data, in the TDM access adapter section 2, the layer selection section 21 selects the allocation layer m of the TDM data designated by the setting section 26 from the n-layer reception data bus 13, and the multiplexing section 22 The data is multiplexed and sent to the burst access unit 23.

In the burst access section 23, the timing generation section 23c
extracts pre-allocated time slots and performs TDM
Send the data to the reception buffer 23a or the transmission buffer 23b, give the TDM data in the reception buffer 23a to the TDM terminal 5 via the external interface section 23d, or
The TDM data from the DM terminal 5 is transmitted from the transmission buffer to the transmission data bus 14 of a predetermined m layer by the separation section 24 via the external interface section 23d.

The data sent to the transmission data bus 14 is sent via the transmission/reception control section 17 to the bit multiplexing section 15, where the data is multiplexed using a frame division method and sent from the data repeater 16 to the LAN transmission path.

At this time, the timing generation unit 23c sends a transmission request to the transmission request line 19, and sends a TDM signal to a predetermined time slot on the assigned transmission data bus 14.
Send data.

It should be noted that since the transmission requests on the burst side and the transmission requests on the TDM side are assigned different allocation layers, there is no problem even if the transmission requests occur at the same time.

〔Effect of the invention〕

As described above, according to the loop type LAN communication node device according to the present invention, the multilayer transmission/reception data bus is divided and determined in advance into burst data and TDM data, and the corresponding bus groups are selected and multiplexed. Since the structure is configured to transmit and receive each data by dividing and separating it, it is possible to easily separate the burst data and TDM data mixed in the frame from the multilayer data bus, and to allocate bandwidth to the multilayer data bus. It is possible to simplify the configuration of data transmission and reception between the bus and the burst/TDM7/1 access section, and in TDM communication node equipment with an existing multilayer data bus, burst data can be transferred by simply adding a relatively simple configuration. It is possible to realize a hybrid LAN system in which TDM data and TDM data coexist.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the principle configuration of a loop-type LAN communication node device according to the present invention, and FIG. 2 is a circuit block diagram showing an embodiment of the loop-type LAN communication node device according to the present invention. , FIG. 3 is a diagram showing a frame format used in a frame division method by a communication node device of a conventional loop-type LAN, and FIG. 4 is a circuit block diagram showing an example of a communication node device of a conventional loop-type LAN. be. In the first session, 1... Common part, 2... TDM access adapter part, 3... Burst access adapter part, 4... Burst terminal, 5... TDM terminal, 11.16... Repeater, 12.24.34... Separation unit, 13... Multilayer reception data bus, 14... Multilayer transmission data bus, 15.22.32... Multiplexing unit, 21.31... Layer Selection unit, 23...TDM access unit, 33...Burst access unit. In the figures, the same reference numerals indicate the same or corresponding parts. agent

Claims (1)

[Claims] In a loop-type LAN communication node device having a multilayer bus in which multiplexed data is layer-separated, multilayer reception data connected to the LAN via a repeater (11) and a separation unit (12). a layer selection unit (31) that simultaneously selects data across a predetermined plurality of layers corresponding to burst data areas multiplexed within one frame from the bus (13); and multiplexes the selected burst data. Multiplexing section (3
2), a burst access unit (33) that performs input/output control of the multiplexed burst data, and a burst data output from the burst access unit (33) to a predetermined plurality of multilayer transmission data buses (14). A separation unit (34) that separates the data into layers and sends it to the LAN via the multiplexing unit (15) and repeater (16), and a divided TDM data area within one frame of the reception data bus (13). a layer selection unit (21) that simultaneously selects data on one or more predetermined layers corresponding to the data, a multiplexing unit (22) that multiplexes the selected TDM data, and input/output of the multiplexed TDM data. TDM to control
an access section (23), and separates the TDM data output from the TDM access section (23) and sends it to one or more predetermined layers of the transmission data bus (14), and sends it to a multiplexing section (15) and a repeater. (16)
A communication node device for a loop-type LAN, comprising: a separation unit (24) for sending data to the LAN via the LAN.