KR200299488Y1 - Line Coding Device for Subscriber Interface Module in ATM Switching System - Google Patents

Abstract

The present invention relates to a line coding device of a subscriber matching device in an ATM switch, and particularly, when the subscriber matching device is in an unframed mode and uses line coding as an AMI (Alternative Mark Inversion) method. The present invention relates to a line coding device of a subscriber matching device in an ATM switch which prevents false error reporting to another system when a connection inside a scheme is released.

In the ATM according to the present invention, the line coding apparatus of the subscriber matching apparatus includes: an AAL gater for converting an ATM cell transmitted from an upper block into a voice traffic signal and transmitting the same to another system; An AND gate for performing an AND operation on the serial clock and the line clock transmitted from the AAL gate; State check control logic to monitor the input through the AND gate to monitor whether the number of consecutive '0' bits has reached an arbitrary signal loss threshold; A central control unit periodically monitoring the monitoring information of the state check control logic; When the number of consecutive '0' bits has been reported from the central control unit to reach an arbitrary signal loss threshold, the B8ZS enable register is enabled and enabled. It characterized in that it comprises a framer (Framer) for delivering the voice traffic signal in a frame to another system.

Description

Line Coding Device for Subscriber Interface Module in ATM Switching System}

The present invention relates to a line coding device of a subscriber matching device in an ATM switch, and particularly, when the subscriber matching device is in an unframed mode and uses line coding as an AMI (Alternative Mark Inversion) method. The present invention relates to a line coding device of a subscriber matching device in an ATM switch which prevents false error reporting to another system when a connection inside a scheme is released.

In general, among subscriber matching devices of an asynchronous transfer mode (hereinafter referred to as 'ATM'), a DS1 subscriber matching device having a line transmission rate of 1.544Mhz and a DS1E subscriber matching device having a line transmission rate of 2.048Mhz are used. This is called a slow subscriber matching device.

Among the above-described low speed subscriber matching devices, a CES subscriber circuit providing device for providing a voice traffic service is in an unframed mode and is set to an alternate mark inversion (AMI) line coding scheme to another system. If traffic is transmitted with a mixture of '0' and '1' bits, there is no problem of signal loss. However, when the connection inside the ATM aggregation method is disconnected, if no traffic is transmitted from the upper block, '0' bits are continuously sent to other systems through the line. In this case, even if the line is normally connected, signal loss is detected in other systems, resulting in an error in link partner reporting.

The reason for this is that in Framed Mode, even though traffic from upper block is '0' bit continuously, because '1' bit is mixed in Framer, signal loss is not detected in other systems. In frame mode, only the '0' bit is transmitted to the line clock continuously, and '1' bit is not inserted in the framer, and only '0' bit is transmitted. have. However, even in the unframe mode, if the line coding method is not an AMI (Alternative Mark Inversion) method and the bit 8 zero sequence (B8ZS), when the continuous '0' bits reach a random signal loss threshold, the '1' bits are mixed. Does not cause signal loss in the system.

As described above, in the conventional low-speed subscriber matching device, when the connection inside the ATM aggregation scheme is disconnected, when no traffic is transmitted from the upper block, '0' bits are continuously sent to other systems through the line. In this case, even though the line is normally connected, signal loss is detected in other systems, which causes an error in link partner reporting.

The present invention is to solve the above-mentioned general problems, the purpose of which is that the low-speed subscriber matching device is an unframed mode and uses the line coding method as the AMI method, the traffic transmitted from the upper block is disconnected from the upper block This is to prevent the false error reporting to other system even though the link is normally connected when passing consecutive '0' bits to other system as it is.

1 is a diagram showing a line coding apparatus of a subscriber matching apparatus in an ATM switch according to the present invention.

Fig. 2 is a diagram showing details of the state check control logic in Fig. 1;

* Description of the symbols for the main parts of the drawings *

100: CES subscriber matching device 20: health check control logic

200: upper block 30: central control unit

300: other system 40: Framer

10: AAL1 Gator (ATM Adaptation Layer 1 Gator)

In the ATM switch of the present invention for achieving the above object, the line coding apparatus of the subscriber matching device includes: an AAL gater for converting an ATM cell transmitted from an upper block into a voice traffic signal and transmitting it to another system; An AND gate for performing an AND operation on the serial clock and the line clock transmitted from the AAL gate; State check control logic to monitor the input through the AND gate to monitor whether the number of consecutive '0' bits has reached an arbitrary signal loss threshold; A central control unit periodically monitoring the monitoring information of the state check control logic; When the number of consecutive '0' bits has been reported from the central control unit to reach an arbitrary signal loss threshold, the B8ZS enable register is enabled and enabled. It characterized in that it comprises a framer (Framer) for delivering the voice traffic signal in a frame to another system.

Hereinafter, with reference to the accompanying drawings, an embodiment of the present invention in detail as follows.

As shown in FIG. 1, the line coding apparatus of the subscriber matching device in the ATM switch according to the present invention comprises a CES subscriber matching card 100, an upper block 200, and another system 300, and the corresponding CES subscriber. The matching card 100 includes an AAL1 gater 10, a state check control logic 20, a central control unit 30, and a framer 40.

The AAL1 gator 10 converts the ATM cell transmitted from the upper block 200 into a voice traffic signal and transmits the voice cell to another system 300, and converts the voice traffic transmitted from the other system 300 into an ATM cell and converts the ATM cell into an ATM cell. Send to (200).

As shown in FIG. 2, the state check control logic 20 includes a counter 21 and a register 22, and the serial data and the line clock are transmitted from the AAL1 gate 10. FIG. ) Is counted by the counter 21 by the AND gate, and counted in the counter 21, and the number of consecutively applied '0' bits reaches an arbitrary signal loss threshold. Set the flag to active.

The central control unit 30 performs a connection management function of the CES subscriber matching device, communicates with the control module of the upper block 200 through an internal message, and registers 22 provided in the state check control logic 20. It is responsible for periodically monitoring the flag of and reporting it to the framer 40.

The primer 40 periodically monitors the flag of the register 22 included in the state check control logic 20 from the central control unit 30 and reports that the flag is set to the active state. The enable register is enabled, and the enabled voice traffic signal is delivered in a frame to another system 300. However, the framer 40 receives the state check control logic 20 from the central controller 30. In the event of periodic monitoring of the flag of the register 22 included in the module) and reporting that the flag is set to the inactive state, the B8ZS enable register (Bit 8 Zero Sequence Enable Register) is disabled. It is responsible for converting coding method from Bit8 Zero Sequence (B8ZS) method to Alternative Mark Inversion (AMI) method.

The line coding method of the subscriber matching device in the ATM switch according to the present invention will be described as follows. First, when the connection between the upper block 200 and the CES subscriber matching device 100 is released, the signal from the AAL1 gater 10 is released. The logical data of the serial data and the line clock transmitted to the processor 40 are AND-gateed, and the result is counted at the counter 21 of the state check control logic 20, so that the number of '0' bits continuously applied is arbitrary. When the signal loss threshold is reached, a flag is set in an active state in the register 32 of the state check control logic 20. In this case, the central controller 30 periodically monitors a flag of the state check control logic 20 and controls to enable the B8ZS enable register of the framer 40 when the flag is set to an active state. Then, at that moment, the line coding method is converted from AMI method to B8ZS method so that '0' bits are not continuously outputted to other systems, and '1' bits are mixed for 8 consecutive '0' bits, so the signal to other systems is Loss can be prevented.

In addition, when the connection setting with the upper block 200 is normally performed, and traffic in which '0' and '1' bits are normally mixed is transmitted, the flag of the register 22 provided in the state check control logic 20 is transmitted. Is set to an inactive state, and the central control unit 30, which periodically monitors this, controls the framer 40 to disable the B8ZS enable register and converts the line coding method back to the AMI method. While the above has been described in detail with respect to preferred embodiments of the present invention, those skilled in the art to which the present invention belongs, it can be carried out by changing or changing the present invention in various ways You will know. Therefore, changes of the embodiments of the present invention will not be able to escape the technical scope of the present invention.

As described above, the present invention has a configuration in which a low-speed CES subscriber matching device of an ATM integrated method is normally linked with another system, in particular, when an operation mode is an unframe mode and an AMI is determined and operated by a line coding method. When the upper connection is released and normal traffic is not delivered to the CES subscriber matching device, line coding is immediately performed when the number of '0' bits continuously applied by monitoring data from the upper block reaches an arbitrary signal loss threshold. By changing the method from AMI (Alternative Mark Inversion) to Bit 8 Zero Sequence (B8ZS), it is possible to prevent false error reporting to other systems even though the line connection between the CES subscriber matching device and other systems is normal.

Claims (2)

An AAL gater converting an ATM cell transmitted from an upper block into a voice traffic signal and transmitting the same to another system; An AND gate for performing an AND operation on the serial clock and the line clock transmitted from the AAL gate; State check control logic to monitor the input through the AND gate to monitor whether the number of consecutive '0' bits has reached an arbitrary signal loss threshold; A central control unit periodically monitoring the monitoring information of the state check control logic; When the number of consecutive '0' bits has been reported from the central control unit to reach an arbitrary signal loss threshold, the B8ZS enable register is enabled and enabled. Line coding apparatus of the subscriber matching device in the ATM switch, characterized in that it comprises a framer (Framer) for delivering the voice traffic signal to the frame to another system. The method of claim 1, When the framer is informed by the central controller that the number of consecutive '0' bits has not reached an arbitrary signal loss threshold, the B8ZS enable register is disabled. A line coding apparatus of a subscriber matching device in an ATM switch, characterized by converting a line coding scheme from a bit 8 zero sequence (B8ZS) scheme to an alternate mark inversion (AMI) scheme.