JPH0537545A - Alarm transfer system and atm communication equipment using the system - Google Patents

Abstract

PURPOSE:To prevent congestion of data in the communication equipment by transferring an alarm signal at a speed below an average transmission information speed. CONSTITUTION:The system consists of an existing terminal interface section 1, a VCI termination section 2 provided with an ATM cell composition decomposition section, a loopback control section, an alarm detection section and an alarm transmission section, a VPI termination section 3, a line interface 4 and an internal bus 5 used for interfacing each section. Then alarm information is transferred at a speed below a minimum VC speed when the alarm and loopback execution information detected by the VCI termination section 2 are noticed to the VCI termination section in an ATM communication equipment of an opposite station.

Description

Detailed Description of the Invention

[0001]

The present invention relates to an ATM (Asynchronous Trunk).
Ansfer Mode, Asynchronous Transfer Mode) Regarding alarm transfer between devices of communication device, especially alarm transfer method for converting alarm rate by transmitting speed conversion and AT using the same
M communication device.

[0002]

2. Description of the Related Art In a conventional ATM communication device, alarm transfer such as alarm information or loopback execution information from an existing terminal interface is performed by a preset VC (Vir.
Information was transmitted at the speed of tual call). In the ATM transmission method, information such as voice, terminal data, and image is allocated and transmitted in cell units. The cell is
The alarm information is composed of a header part and a data part, and the alarm information is transferred to the player side by writing a code string "1" or a code string "0" in the entire data part, for example.

[0003]

However, in the above-mentioned conventional alarm transfer, when the alarm transfer is performed in the network of the line speed designed by the distributed constant, congestion may occur and cells may be discarded. It was
That is, if the data portion is entirely used for alarm information and the alarm transfer is performed at the line speed of the ATM communication device, congestion may occur inside the communication device, and data may be discarded or lost.

The present invention has been made in consideration of the above circumstances, and provides an alarm transfer system and an ATM communication device using the alarm transfer system for transferring an alarm based on the minimum VC speed guaranteed at the stage of circuit design. provide.

[0005]

FIG. 1 is a block diagram showing the principle of the present invention. This invention has the following two forms. The first invention is the existing terminal interface unit 1,
VCI terminating unit 2 including ATM cell assembling / disassembling unit, loopback control unit, alarm detection unit and alarm transmission unit
An alarm transfer system for an ATM communication device, which comprises a VPI termination unit 3, a line interface 4 and an internal bus 5 that interfaces with each unit.
An alarm transfer method characterized by performing alarm transfer at a minimum VC speed or less when notifying the VCI terminal part in the ATM communication apparatus of the opposite station of the alarm or loopback execution information detected by the I terminal part 2. is there.

In the second invention, the VCI terminating unit 13 has an alarm detecting unit 15 for detecting an alarm, a loopback controlling unit 16 for controlling loopback of data, and a cell assembling unit 17.
A cell information disassembly unit 18 and an alarm cell transmission unit 19, and the alarm cell transmission unit 19 stores a speed information table 21 in which speed information below the VC speed is stored for each channel, and the loopback control unit. The alarm cell speed at which the speed information of the corresponding channel is selected from the speed information table 21 according to the alarm generation channel information or the loopback execution channel information output from 16 and the alarm cell is converted to the selected speed and output as the transmission timing. Management unit 20 and alarm cell speed management unit 2
An ATM communication device comprising an alarm cell assembling section 22 for sending an alarm cell to a player according to a sending timing output from 0.

That is, according to the present invention, the average transmission information rate (average bit rate) or less, for example, 1 / (average bit rate)
The main purpose is to prevent data congestion in the communication device by performing alarm transfer at a transmission rate of 2 or 1/4.

[0008]

When the ATM communication device performs data loopback for the purpose of, for example, a test, no data is transmitted to the player side, but the player side cannot recognize that the loopback test is being performed, and the data is sequentially fetched. To try In order to prevent this, the alarm information is transferred to the player side during the loopback test, the player side receives the alarm information, stops the data transmission, and stops the data from the player side. According to the present invention, when alarm information is detected and transferred to the opposite side, the transmission rate is converted into a transmission rate equal to or lower than the average bit rate, and the information is transferred to the opposite side. As a result, it is possible to prevent data congestion from occurring inside the communication device.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the embodiments shown in the drawings. The present invention is not limited to this. FIG. 2 is a block diagram of an ATM communication device for realizing the alarm transfer system of the present invention. In the figure, 10 is an existing terminal, to which voice, data, video information and the like are input. An ATM communication device 11 includes a channel interface (CH I / F) 12, a VCI terminal unit 13, and a VP.
It is mainly composed of the I terminal portion 14.

The VCI terminating unit 13 is for transmitting a failure of the channel interface 12 and loopback execution information to the game, and includes an alarm (ALM) detecting unit 15, a loopback control unit 16, a cell assembling unit 17, and a cell assembling unit. Decomposition part 18
And an alarm (ALM) cell transmission unit 19 which is a characteristic part of this embodiment.

FIG. 3 is a functional block diagram showing the configuration of the ALM sending section 19. This ALM cell sending unit 19
ALM cell speed management unit 20 including a microprocessor
And an ALM cell assembling / sending unit 22 for each channel (CH) speed information management table 21 including a RAM.

In such a configuration, the ALM detection unit 1
5 or the information from the loopback control unit 16, when sending an alarm cell from the ALM cell sending unit 19 to the game, it should be sent at a minimum VC speed or less preset in each CH speed information management table 21. , ALM cell rate management unit 20 controls the transmission rate and generates the transmission timing.

Specifically, the ALM cell rate management unit 20
Is based on an average bit rate of each CH preset in each CH speed information management table 21 by alarm generation CH information or loopback execution CH information output from the ALM detection unit 15 and the return control unit 16. ALM
The cell transmission speed and the CH number are called and set in the ALM cell assembling / sending unit 22. The rate to be set preferably stores, for example, 1/2 or 1/4 of the average bit rate as data, and is determined by the priority.

There are a plurality of existing terminals 10, each of which has its own bit rate and priority. Therefore, if the bit rate of channel 1 is 2.4 kb / s, for example, the ALM cell speed management unit 20 will use the ALM cell assembling / sending unit 2
1.2k, which is half the bit rate of 2
Instruct to transmit the alarm cell at b / s.

In the present embodiment, the configuration in which the transmission rate of the ALM cell is set to 1/2 and 1/4 has been described, but the set rate is not limited to this as long as it is the minimum VC rate or less. Many can be set.

[0016]

According to the present invention, in the alarm transfer in the ATM communication device, when the alarm actually occurs or when the loopback is executed, the alarm information is transmitted at a speed lower than the minimum VC speed of the normal data communication to prevent congestion, Since it is possible to reduce the probability of cell discard, it is possible to increase the reliability in ATM communication.

[Brief description of drawings]

FIG. 1 is a principle configuration diagram of the present invention.

FIG. 2 is a block diagram showing a configuration of an exemplary embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of an ALM cell transmission unit shown in FIG.

[Explanation of symbols]

1 Existing terminal interface section 2 VCI termination 3 VPI terminal 4 line interface section

Claims (2)

[Claims] 1. An existing terminal interface section (1) and an A
VCI terminal unit (2) including TM cell assembling / disassembling unit, loopback control unit, alarm detection unit and alarm transmission unit (2)
An alarm transfer method for an ATM communication device comprising a VPI termination unit (3), a line interface (4) and an internal bus (5) that interfaces with each unit, and is detected by the VCI termination unit (2). An alarm transfer method characterized by performing alarm transfer at a minimum VC speed or lower when notifying a generated alarm or loopback execution information to the VCI terminal unit in the ATM communication device of the opposite station. 2. A VCI terminal unit (13), an alarm detection unit (15) for detecting an alarm, a loopback control unit (16) for controlling data loopback, a cell assembly unit (17), and a cell disassembly unit. (18) and an alarm cell transmission unit (19), the alarm cell transmission unit (19)
Speed information table that stores speed information below C speed
(21) and the alarm generation channel information or the loopback execution channel information output from the loopback control unit (16), the speed information of the corresponding channel is selected from the speed information table (21), and the alarm cell is selected. The alarm cell speed management unit (20) that converts the speed to the specified speed and outputs it as the transmission timing, and the alarm cell assembly unit (2) that sends the alarm cell to the game according to the transmission timing output from the alarm cell speed management unit (20).
2) An ATM communication device comprising: