KR960016265A - CPCS Trailer Processing System of ATM Communication System - Google Patents

CPCS Trailer Processing System of ATM Communication System Download PDF

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Publication number
KR960016265A
KR960016265A KR1019940028196A KR19940028196A KR960016265A KR 960016265 A KR960016265 A KR 960016265A KR 1019940028196 A KR1019940028196 A KR 1019940028196A KR 19940028196 A KR19940028196 A KR 19940028196A KR 960016265 A KR960016265 A KR 960016265A
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KR
South Korea
Prior art keywords
data
detection unit
trailer
length
error detection
Prior art date
Application number
KR1019940028196A
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Korean (ko)
Other versions
KR0123232B1 (en
Inventor
윤성욱
Original Assignee
배순훈
대우전자 주식회사
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Priority to KR1019940028196A priority Critical patent/KR0123232B1/en
Publication of KR960016265A publication Critical patent/KR960016265A/en
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Publication of KR0123232B1 publication Critical patent/KR0123232B1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0823—Errors, e.g. transmission errors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/43—Assembling or disassembling of packets, e.g. segmentation and reassembly [SAR]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/90—Buffering arrangements
    • H04L49/9057—Arrangements for supporting packet reassembly or resequencing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5638—Services, e.g. multimedia, GOS, QOS
    • H04L2012/5646—Cell characteristics, e.g. loss, delay, jitter, sequence integrity
    • H04L2012/5652—Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5638—Services, e.g. multimedia, GOS, QOS
    • H04L2012/5646—Cell characteristics, e.g. loss, delay, jitter, sequence integrity
    • H04L2012/5652—Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly
    • H04L2012/5653—Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly using the ATM adaptation layer [AAL]
    • H04L2012/5657—Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly using the ATM adaptation layer [AAL] using the AAL3/4

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Environmental & Geological Engineering (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

본 발명은 CPCS 트레일러 처리장치에 관한 것으로, CPCS 트레일러 데이타중 얼라인먼트(AL) 데이타를 래치하여 얼라인먼트에러를 검색하는 얼라인먼트에러검출부(10)와; CPCS 트레일러 데이타중 끝태그(Btag)데이타를 래치하여 시작태그(Batg)와 비교하여 태그에러를 검출하는 태그에러검출부(20); CPCS 트레일러 데이타중 길이표시(LI)데이타를 래치하여 버퍼할당(BAsize)데이타와 비교하여 길이에러를 검출하는 길이에러검출부(30); 및 트레일러선택(c_t)신호에 의해 인에이블된 후 카운트비트에 따라 상기 얼라인먼트에러검출부(10)나 태그에러검출부(20)나 길이에러검출부(30)증 하나를 선택하는 선택기(40)를 구비하여 4바이트의 CPCS 트레일러를 각각 읽어들인 후 1바이트의 얼라인먼트, 1바이트의 Etag, 2바이트의 LI로 구분하여 트레일러 에러가 발생하였는지를 검사한다.The present invention relates to a CPCS trailer processing apparatus, comprising: an alignment error detection unit (10) for latching alignment (AL) data in CPCS trailer data to search for an alignment error; A tag error detection unit 20 for latching an end tag data of CPCS trailer data to detect a tag error by comparing with a start tag Batg; A length error detector (30) for latching the length indication (LI) data in the CPCS trailer data and detecting the length error in comparison with the buffer allocation (BAsize) data; And a selector 40 for selecting one of the alignment error detection unit 10, the tag error detection unit 20, or the length error detection unit 30 according to the count bit after being enabled by the trailer selection (c_t) signal. After reading each 4-byte CPCS trailer, it checks whether a trailer error has occurred by dividing it into 1-byte alignment, 1-byte Etag, and 2-byte LI.

Description

ATM 통신방식의 CPCS 트레일러 처리장치CPCS Trailer Processing System of ATM Communication System

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제1도는 본 발명에 따른 CPCS 트레일러 처리장치를 설명하기 위하여 도시한 것으로서, (가)는 AAL계층의 데이타 흐름 구조를 도시한 도면, (나)는 CPCS-PDU 데이타의 포맷을 도시한 도면,1 is a diagram illustrating a CPCS trailer processing apparatus according to the present invention, (a) shows a data flow structure of an AAL layer, (b) shows a format of CPCS-PDU data,

제2도는 본 발명에 따른 CPCS 트레일러 처리장치를 도시한 블럭도,2 is a block diagram showing a CPCS trailer processing apparatus according to the present invention,

제3도는 제2도에 도시된 길이에러검출부의 세부 블럭도.3 is a detailed block diagram of a length error detection unit shown in FIG.

Claims (3)

ATM통신방식의 AAL 3/4 프로토콜에 따른 CPCS 트레일러처리장치에 있어서, CPCS 트레일러 데이타중 얼라인먼트(AL) 데이타를 래치하여 얼라인먼트에러를 검색하는 얼라인먼트에러검출부(10)와; CPCS 트레일러 데이타중 끝태그(Btag)데이타를 래치하여 시작태그(Btag)와 비교하여 태그에러를 검출하는 태그에러검출부(20); CPCS 트레일러 데이타중 길이(LI)데이타를 래치하여 버퍼할당(BAsize)데이타와 비교하여 길이에러를 검출하는 길이에러검출부(30); 및 트레일러선택(c_t)신호에 의해 인에이블된 후 카운트 비트에 따라 상기 얼라인먼트에러검출부(10)나 태그에러검출부(20)나 길이에러검출부(30)중 하나를 선택하는 선택기(40)를 구비하여 4바이트의 CPCS 트레일러를 각각 읽어들인 후 1바이트의 얼라인먼트, 1바이트의 Etag, 2바이트의 LI로 구분하여 트레일러 에러가 발생하였는지를 검출하는 것을 특징으로 하는 ATM통신방식의 CPCS 트레일러 처리장치.A CPCS trailer processing apparatus according to AAL 3/4 protocol of ATM communication system, comprising: an alignment error detection unit (10) for latching alignment (AL) data in CPCS trailer data to search for an alignment error; A tag error detection unit 20 for latching an end tag data of CPCS trailer data to detect a tag error by comparing with a start tag Btag; A length error detection unit 30 for latching the length LI data of the CPCS trailer data and detecting the length error in comparison with the buffer allocation data; And a selector 40 for selecting one of the alignment error detection unit 10, the tag error detection unit 20, or the length error detection unit 30 according to the count bit after being enabled by the trailer selection (c_t) signal. And a CPCS trailer processing apparatus for detecting whether a trailer error has occurred by dividing a 4-byte CPCS trailer into one byte alignment, one byte Etag, and two bytes LI. 제1항에 있어서, 상기 CPCS 트레일러 처리장치는 상기 얼라인먼트에러검출부(10)의 출력과 상기 태그에러검출부(20)의 출력과 상기 길이에러검출부(20)의 출력을 논리합하여 트레일러에러(st_err)를 발생하는 오아게이트(45)를 더 구비한 것을 특징으로 하는 ATM통신방식의 CPCS 트레일러 처리장치.The CPCS trailer processing apparatus according to claim 1, wherein the CPCS trailer processing apparatus combines the output of the alignment error detection unit 10, the output of the tag error detection unit 20, and the output of the length error detection unit 20 to generate a trailer error (st_err). CPCS trailer processing apparatus of the ATM communication method characterized in that it further comprises an oragate (45) generated. 제1항에 있어서, 상기 길이에러검출부(30)는 버퍼할당(Basize) 데이타와 길이표시(cpcs_length) 데이타를 감산하는 감산기(32)와; 버퍼할당(BAsize)데이타의 크기와 길이표시(cpcs_length)의 크기를 비교하는 비교기(34); 상기 감산기(32)의 출력을 “4”와 비교하는 4비교기(36); 상기 비교기(34)와 4비교기(36)의 출력을 논리합하여 길이에러신호(LI_err)를 출력하는 오아게이트(38)로 구성되는 것을 특징으로 하는 ATM통신방식의 CPCS 트레일러 처리장치.The apparatus of claim 1, wherein the length error detection unit (30) comprises: a subtractor (32) for subtracting buffer allocation data (Basize) data and length indication (cpcs_length) data; A comparator 34 for comparing the size of the buffer allocation data BAsize with the size of the length indication cpcs_length; A four comparator 36 for comparing the output of the subtractor 32 with " 4 "; And an OR gate (38) for outputting a length error signal (LI_err) by ORing the outputs of the comparator (34) and the four comparators (36). ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019940028196A 1994-10-31 1994-10-31 A circuit for processing cpcs trailer in aal type 3/4 of atm KR0123232B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019940028196A KR0123232B1 (en) 1994-10-31 1994-10-31 A circuit for processing cpcs trailer in aal type 3/4 of atm

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019940028196A KR0123232B1 (en) 1994-10-31 1994-10-31 A circuit for processing cpcs trailer in aal type 3/4 of atm

Publications (2)

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KR960016265A true KR960016265A (en) 1996-05-22
KR0123232B1 KR0123232B1 (en) 1997-11-20

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KR1019940028196A KR0123232B1 (en) 1994-10-31 1994-10-31 A circuit for processing cpcs trailer in aal type 3/4 of atm

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