JP3068428B2 - ATM communication device with overflow information protection function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ATM communication apparatus having an overflow information protection function.

[0002]

2. Description of the Related Art Conventionally, as an overflow information protection circuit in an ATM communication device, there has been a circuit having a means for suppressing the output of a preceding stage of a temporary storage section which has reached an overflow area.
A conventional functional block diagram when this circuit is used is shown.

[0003] The conventional circuit includes temporary storage units 41 and 44,
It comprises alarm state detection / cancellation determination sections 42 and 45 and transmission permission determination sections 43 and 46. Temporary storage units 41 and 44
Are, respectively, the alarm state detection / cancellation determination units 42 and 45 in the reception unit and the transmission permission determination units 43 and 46 in the transmission unit.
have. Normally, the temporary storage units 41 and 44 are not in an alarm state but in a transmission permission state. Main information is main information 4
It flows from 8 to 49, 50. The information transmitted from the temporary storage unit 44 is stored in the temporary storage unit 41, and the transmission is performed if the subsequent stage is in the transmission permission state. When an alarm state is detected by the alarm state detection / cancellation determination section 42 of the temporary storage section 41, a preceding output suppression signal 47 is notified to the preceding temporary storage section 44. The temporary storage unit 44 receives the preceding-stage output suppression signal 47 by the transmission permission determination unit 46, detects the transmission prohibition state, and stops the transmission. The temporary storage unit 44 always monitors the alarm state in the transmission permission determination unit 46. When the accumulation amount of the temporary storage unit 41 decreases and the vehicle exits the danger zone, the alarm state is released, and the alarm state detection / cancellation determination unit 42 of the temporary storage unit 41 releases the notification of the preceding-stage output suppression signal 47. Transmission permission of temporary storage unit 44
The judgment unit 46 receives the alarm release notification of the temporary storage unit 41, detects the transmission permission state, and restarts the transmission of the information being stored.

[0004]

Conventionally, there has been an increase in the number of information storage units or a preceding stage output suppression process as means for protecting overflow information. First, burst information and a preceding stage output suppression process can occur. Since it is very difficult to specify a possible buffer, it is necessary to increase a plurality of buffers, which increases the scale of hardware. That is,
Excessive circuit configuration may result. Secondly, there is a drawback that the amount of accumulation in the preceding stage is also affected, so that it is necessary to consider the allowable amount.

[0005] An object of the present invention is to connect a spare information storage means to a preceding stage when an unexpected information storage condition occurs and it is determined that the storage capacity is exceeded. It is to switch over to the storage means, switch the output of the spare information storage means to the input side of the information storage means whose input side has been switched to the spare information storage means, and protect the overflow information.

[0006]

According to the present invention, there is provided an ATM communication apparatus having an overflow information protection function, comprising: a plurality of information storage means for temporarily storing communication information; Spare information storage means to be assigned;
Means for predicting that the storage capacity of the plurality of information storage means is insufficient, and means for connecting the spare information storage means to any of the plurality of information storage means expected to be short of storage capacity , The connecting means may be attached to the information.
According to the added route information, the information is input to a plurality of input / output ports.
Switch that can perform switching processing for
Information or re-switching main information
The route information is added to one piece of information.
Come .

Here, as a method of anticipating that the storage capacity of the information storage means will be insufficient, the information storage means uses the FI.
If the buffer is an FO buffer, the state of the storage capacity can be detected by comparing a difference between a write pointer and a read pointer (address) that fluctuates in accordance with writing and reading of information to and from the buffer with a specified value.

[0008]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing an outline of processing of an output buffer type switch unit in an ATM communication apparatus.
It comprises a switch unit 2 and a temporary storage unit 3. FIG.
FIG. 7A is a diagram illustrating a state in which a communication path is established by specifying a normal route. FIG. 1B is a diagram showing a state in which a spare temporary storage unit is connected so that overflow information does not occur.

[0010] One port portion is switched to its own port, a selector 1 for selecting either the main information 5 or the re-switching main information 8, a switch unit 2 capable of performing switching processing on a plurality of input / output ports. And a temporary storage unit 3 for temporarily storing the main information. 1 and 2
Is an ATM communication device with input and output for 5 ports.
Configurations for ports are provided for 5 ports.

The selecting section 1 performs a process of selecting the main information 5 and the main information after switching output from the temporary storage section. S
The switch unit 2 performs a switching process according to the route information added to the information. The temporary storage unit 3 temporarily stores the switched information. In FIG. 1A, it is assumed that there is one unused output port. The temporary storage unit installed in this unused port becomes the connection temporary storage unit 4.

When the main information 5 to which the route information is added is switched as shown in FIG. 1A, or when this route information is normally added, the temporary storage unit of the destination route is provided. When it is predicted that will overflow, FIG. 1 (b)
The route information is added so as to be switched to the connection temporary storage unit 4 as shown in FIG. The output information from the connection temporary storage unit is selected by the selection unit 1 as the re-switching main information 6, and n (n = the maximum value is the number of unused ports or the maximum number of route information additions, whichever is smaller). (Possible) Switching to the destination route is performed by the second switching route information.

This processing is equivalent to an increase in the capacity of the temporary storage section 3, and overflow information can be greatly reduced. In addition to the process of connecting the temporary storage units of all the paths as shown in FIG. 1A to FIG.
As shown in (1), it is possible to connect the temporary storage unit only to specific information such as only a specific path or only a specific information priority. That is, it is possible to secure a different temporary storage capacity depending on the communication path. At the time of re-switching, any output port can be specified for any input port because the route designation can be freely assigned, and it can be used as a common temporary storage unit for multiple output ports. realizable.

If it is desired to further increase the temporary storage section, it is possible to further connect the temporary storage section by the same processing as shown in FIG. 2 (b). However, the route information is required for the number of times of switching. When there are several unused switching ports, all of them can be used as a temporary storage unit for connection. FIG. 2B is a connection example when two unused ports are present. The temporary storage unit 23 and the connection temporary storage units 24 and 28 realize connection of up to three stages. . It is preferable that the number of connection stages is small for communication information such as voice that it is preferable that the delay is small even if discarded to some extent. As for communication information for normal data transmission / reception, the smaller the amount of information discarded even with a slight delay, the higher the device quality.

[0015]

As described above, according to the present invention, overflow information can be greatly reduced by connecting a spare information storage means to an information storage means for temporarily storing communication information.

[Brief description of the drawings]

FIG. 1 is a view showing an outline of processing in an embodiment of the present invention.

FIG. 2 is a diagram showing examples of various types of connection in one embodiment of the present invention.

FIG. 3 is a block diagram showing a conventional configuration.

[Explanation of symbols]

 1, 21 selection unit 2, 22 switch unit 3, 23 temporary storage unit 4, 24, 28 temporary storage unit for connection

Continuation of the front page (56) References JP-A-62-1343 (JP, A) JP-A-3-175844 (JP, A) JP-A-2-217704 (JP, A) JP-A-6-85842 (JP) JP-A-6-164641 (JP, A) JP-A-63-232544 (JP, A) JP-A-63-102527 (JP, A) JP-A-62-186632 (JP, A) JP-A-1-193137 (JP, A) JP-A-6-284453 (JP, A) JP-A-8-149158 (JP, A) JP-B-56-17864 (JP, A) B2) (58) Field surveyed (Int. Cl. ⁷ , DB name) H04L 12/56 H04L 12/28

Claims (1)

(57) [Claims] A plurality of information storage means for temporarily storing communication information; a spare information storage means selectively allocated from the plurality of information storage means; and a storage capacity of the plurality of information storage means. And a means for connecting the spare information storage means to one of the plurality of information storage means expected to have a shortage of storage capacity , wherein the connection means adds information to the information. Directions
Switch the information to multiple input / output ports according to the information.
Switch that can perform the switching process and main information or re-switch
And a selection unit for selecting either of
An ATM communication device having an overflow information protection function , wherein a plurality of the route information can be added to one information .