1、 AMERICAN NATIONAL STANDARD FOR TELECOMMUNICATIONS ATIS-0300231.03.2003(R2007) DS3 Layer 1 In-Service Digital Transmission Performance Monitoring ATIS is the leading technical planning and standards development organization committed to the rapid development of global, market-driven standards for th
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9、rpretations should be addressed to the secretariat or sponsor whose name appears on the title page of this standard. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken perio
10、dically to reaffirm, revise, or withdraw this standard. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute. Notice of Disclaimer Revision T1.231-1997) American National Standard for Telecommunicat
11、ions DS3 Layer 1 In-Service Digital Transmission Performance Monitoring Secretariat Alliance for Telecommunications Industry Solutions Approved October 22, 2003 American National Standards Institute, Inc. Abstract This standard provides performance monitoring (PM) functions and requirements applicab
12、le to DS3 digital transmission. This standard provides functional requirements to support maintenance and is not meant to be an equipment specification. This standard is one of a set of standards which are applications utilizing the common criteria as specified in T1.231-2003. This standard supersed
13、es and replaces T1.231-1997 in its entirety. ATIS-0300231.03.2003 ii Foreword The information contained in this Foreword is not part of this American National Standard (ANS) and has not been processed in accordance with ANSIs requirements for an ANS. As such, this Foreword may contain material that
14、has not been subjected to public review or a consensus process. In addition, it does not contain requirements necessary for conformance to the standard. This American National Standard is one of a series of maintenance operations standards developed by Technical Subcommittee T1M1 of Committee T1 - T
15、elecommunications. Committee T1 standards serve the public through improved understanding between carriers, end-users, and manufacturers. This standard specifies a basic set of monitoring requirements, and provides criteria that are common to a set of standards, the T1.231 series, which define appli
16、cations for a specific level in the digital hierarchy. The documents, which are included in the T1.231 series (at the time that this document is approved), are listed below: T1.231-2003, Digital Hierarchy Layer 1 In-Service Transmission Performance Monitoring. T1.231.01-2003,DSL Layer 1 In-Service T
17、ransmission Performance Monitoring. T1.231.02-2003, DS1 Layer 1 In-Service Digital Transmission Performance Monitoring. T1.231.03-2003, DS3 Layer 1 In-Service Digital Transmission Performance Monitoring. T1.231.04-2003, SONET Layer 1 In-Service Digital Transmission Performance Monitoring. T1.231.05-
18、200x, OTN Layer 1 In-Service Transmission Performance Monitoring. (This standard is not yet approved.) This particular standard will be useful to anyone engaged in the design, provisioning, or operation of telecommunications equipment or services utilizing DS3 digital transmission technology. The st
19、andard establishes uniform and consistent performance monitoring (PM) functions and requirements applicable to Layer 1 DS3. This standard is intended to be a living document, subject to revision and updating as warranted by advances in digital transmission technology Compliance with the standard sho
20、uld provide uniform and consistent measurement parameters and techniques for DS3 circuits, facilities, and networks. In some cases, location-oriented options are needed to ensure compatibility. This need for options is imposed by significant differences between network providers as well as between n
21、etwork elements Requirements are designated by the word shall, while recommendations utilize the word should. Requirements specify the minimum acceptable functionality for effective PM in a network element; recommendations identify functionality that may enhance PM capabilities for some users. There
22、 is one annex in this standard. It is informative, and is not considered part of the standard. Suggestions for the improvement of this standard will be welcome. They should be sent to the Alliance for Telecommunications Industry Solutions, 1200 G Street, NW, Suite 500, Washington, DC, 20005. This st
23、andard was processed and approved for submittal to ANSI by Accredited Standards Committee on Telecommunications, T1. Committee approval of the standard does not necessarily imply that all members voted for its approval. At the time it approved this standard, the T1 Committee had the following member
24、s: E.R. Hapeman, T1 Chair W.R. Zeuch, T1 Vice-Chair J.A. Crandall, T1 Director S.M. Carioti, T1 Disciplines S.D. Barclay, T1 Secretary C.A. Underkoffler, T1 Chief Editor T. Malpass, T1M1 Technical Editor EXCHANGE CARRIERS Organization Represented Name of Representative AT It establishes the PM funct
25、ions that may be used at network interfaces between telecommunication carriers, at network boundaries, and at customer premises to permit compatible maintenance operations. Although this standard establishes ranges over which transmission performance can be measured, it does not establish any requir
26、ements or guidelines for levels of performance. This standard refers to other American National Standards that address digital transmission and performance criteria. 2 Normative References The following standards contain provisions which, through reference in this text, constitute provisions of this
27、 American National Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this American National Standard are encouraged to investigate the possibility of applying the most recent editions of the standards in
28、dicated below. T1.102-1993 (R 1999), Digital Hierarchy - Electrical Interfaces.1T1.107-2002, Digital Hierarchy - Formats Specifications.1T1.231-2003, Digital Hierarchy Layer 1 In-Service Digital Transmission Performance Monitoring.1T1.404-2002, Network-to-customer installation DS3 metallic interface
29、 specification.11This document is available from the Alliance for Telecommunications Industry Solutions, 1200 G Street N.W., Suite 500, Washington, DC 20005. ATIS-0300231.03.2003 2 3 Definitions and Acronyms 3.1 Definitions 3.1.1 alarm indication signal (AIS): A signal transmitted in lieu of the nor
30、mal signal to maintain transmission continuity and to indicate to the receiving equipment that there is a transmission interruption located either at the equipment originating the AIS signal or upstream of that equipment. 3.1.2 alarm indication signal - customer installation (AIS-CI): An AIS signal
31、which carries a special signature defined in T1.403 to indicate that the transmission interruption has originated in the customer installation (CI). 3.1.3 alarm/status monitoring: Surveillance based monitoring process where information pertaining to failure events on a transmission entity is communi
32、cated. 3.1.4 application specific (A): A descriptor, applied to a monitoring capability, indicating that the capability shall be provided when a particular PM application (as defined in this standard) is implemented. 3.1.5 bidirectional path: A pair of unidirectional paths, where each source is phys
33、ically collocated with a path sink. Note that path sources may set far-end PM indications based on information provided by the collocated path sink. 3.1.6 layer 1: The physical layer of the Open Systems Interconnection model. 3.1.7 optional (O): A descriptor, applied to a monitoring capability, indi
34、cating that the capability may or may not be provided in a PM implementation. 3.1.8 path: A logical connection between the point at which a standard frame format for the signal at the given rate is assembled (i.e., path source), and the point at which the standard frame format for the signal is disa
35、ssembled (i.e., path sink). 3.1.9 payload: That portion of the total bitstream not specifically reserved for overhead functions. 3.1.10 performance monitoring (PM): The process of continuous collection, analysis, and reporting of performance data associated with a transmission entity. 3.1.11 protect
36、ion switching (PS): A feature of a transmission entity that enables data on a failed facility to be moved to an alternate facility. This feature may be either revertive or non-revertive. 3.1.12 protection switching - revertive: An arrangement that, upon restoral of the regular line, the service is a
37、utomatically switched back from the protection line to the regular line. 3.1.13 protection switching non-revertive: An arrangement that, upon restoral of the regular line, the service will not automatically switch back from the protection line. This process is used to prevent further service interru
38、ptions that may be caused by the switch. 3.1.14 remote alarm indication (RAI): A signal transmitted in the outgoing direction when a terminal determines that specific defects have persisted long enough to declare a received signal failure. The RAI terminology is in widespread industry use, replacing
39、 an earlier term (yellow alarm). 3.1.15 remote alarm indication signal - customer installation (RAI-CI): An RAI signal which carries a special signature defined in T1.403-1999 to indicate that the received signal failure has originated in the customer installation (CI). 3.1.16 requirement (R): A des
40、criptor, applied to a monitoring capability, indicating that the capability must be provided in all PM implementations to meet this standard. 3.1.17 surveillance: Non-intrusive monitoring of digital signals in real time to recognize performance degradations and failures. 3.1.18 testing: The process
41、of verifying and isolating failures or performance degradations by subjecting network elements to predetermined inputs (e.g., quasi-random test signals) and measuring the resulting response. 3.1.19 unidirectional path: A path that logically connects a single path source with the associated path sink
42、. ATIS-0300231.03.2003 3 3.2 Acronyms AIC Application Identification Channel AIS Alarm Indication Signal AIS-CI Alarm Indication Signal - Customer Installation ANSI American National Standards Institute B3ZS Bipolar with 3 Zero Substitution BER Bit Error Ratio BPV Bipolar Violation CV Code Violation
43、 CVCP Code Violation, CP-Bit CVP Code Violation, P-Bit DS3 Digital Signal Hierarchy, Level 3 ES Errored Second ESA Errored Second, Type A ESACP Errored Second, Type A, CP-Bit ESAP Errored Second, Type A, P-Bit ESB Errored Second, Type B ESBCP Errored Second, Type B, CP-Bit ESBP Errored Second, Type
44、B, P-Bit ESCP Errored Second, CP-Bit ESP Errored Second, P-Bit EXZ Excessive Zeros FC Failure Count FEAC Far-End Alarm and Control Channel FEBE Far-End Block Error FEPR Far-End Performance Report IDI Incoming Defect Indicator Signal IMU Intermediate Maintenance Unit IP Incoming Parity Signal IRDI In
45、termediate Remote Defect Indicator Signal IREI Intermediate Remote Error Indicator Signal L Line LCV Line Code Violation LOF Loss of Frame LOS Loss of Signal NE Network Element NPRM Network Performance Report Message OOF Out of Frame OS Operations System P Path PFE Path Far End PM Performance Monito
46、ring PS Protection Switching ATIS-0300231.03.2003 4 PSC Protection Switching Count PSD Protection Switching Duration PTE Path Terminating Equipment RAI Remote Alarm Indication RAI-CI Remote Alarm Indication - Customer Installation SAS Severely Errored Frame/Alarm Indication Signal (SEF/AIS) Second S
47、EF Severely Errored Frame SEFS Severely Errored Frame Second SES Severely Errored Second SESCP Severely Errored Second, CP-Bit SESP Severely Errored Second, P-Bit TMN Telecommunications Management Network UAS Unavailable Second UASCP Unavailable Second, CP-Bit UASP Unavailable Second, P-Bit UTC Univ
48、ersal Time Coordinated 4 DS3 performance primitives and parameters A DS3 line is a physical transport vehicle that provides the means of moving digital information between two points at the nominal rate of 44.736 Mbit/s. A DS3 line is characterized by bipolar 3-zero substitution (B3ZS) coding and tr
49、ansmission on a metallic medium. A DS3 line is normally an intra-office transport vehicle used to connect DS3 facilities and equipment. Those facilities may utilize standardized transport rates and formats (e.g., SONET), or proprietary transport arrangements. A DS3 path is a framed digital signal between two points at a nominal rate of 44.736 Mbit/s. A DS3 path is independent of the physical transport system(s) over which it is carried. The basic DS3 frame format is called the M-Frame format, described in T1.107-2002. There are currently two applications using t
