1、 ATIS-0300031 Next Generation Interconnection Interoperability (NGIIF) Reference Document Part IX, Installation, Testing and Maintenance Responsibilities of Facilities Attachment A SONET Facilities Version 12.0 ATIS is the leading technical planning and standards development organization committed t
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6、erconnection Interoperability Forum (NGIIF). The NGIIF addresses next-generation network interconnection and interoperability issues associated with emerging technologies. Specifically, it develops operational procedures which involve the network aspects of architecture, disaster preparedness, insta
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13、ities of Facilities, Attachment A, SONET Facilities, Formerly NIIF 5027 The NGIIF Reference Document, Part IX, Installation, Testing and Maintenance Responsibilities of Facilities, Attachment A, SONET Facilities, is an ATIS standard developed by the NGIIF. Published by Alliance for Telecommunication
14、s Industry Solutions 1200 G Street, NW, Suite 500 Washington, DC 20005 Copyright 2011 by Alliance for Telecommunications Industry Solutions All rights reserved. 2 No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written perm
15、ission of the publisher. For information contact ATIS at 202.628.6380. ATIS is online at . Printed in the United States of America. 3 INSTALLATION, TESTING, AND MAINTENANCE RESPONSIBILITIES FOR FACILITIES SONET Facilities Table of Contents 1 INTRODUCTION . 4 2 REFERENCE MODEL . 4 3 ERROR PERFORMANCE
16、 PARAMETERS AND BLOCK SIZES . 4 4 BLOCK SIZE . 5 5 PERCENT ERRORED SECONDS (% ES) 5 6 PERCENT SEVERELY ERRORED SECONDS (% SES) 5 7 BACKGROUND BLOCK ERROR RATIO (BBER) . 5 8 SEVERELY ERRORED PERIOD INTENSITY (SEPI): THE NUMBER OF SEP EVENTS IN AVAILABLE TIME, DIVIDED BY THE TOTAL AVAILABLE TIME. . 5
17、9 TEST DESIGN . 6 9.1 ACCEPTANCE TESTS . 6 9.2 REPAIR VERIFICATION TESTS . 6 9.3 TROUBLE VERIFICATION TESTS 6 10 PERFORMANCE DETERMINATION 6 10.1 PARAMETERS MEASURED . 6 10.2 TEST DURATION . 6 11 SERVICE PERFORMANCE TESTING . 6 12 TESTS FOR 51.84, 155.52, 622.08 MBIT/S, 2.488 GBIT/S, AND 9.865 GBIT/
18、S SERVICES 7 13 TEST PROCEDURES . 7 13.1 SHORT DURATION TESTS 7 13.2 LONG DURATION TESTS . 8 13.3 TEST LIMIT TABLES 8 13.4 ACCEPTANCE AND REPAIR VERIFICATION TEST LIMIT TABLES 8 4 1 Introduction The performance, test, and design parameter information in the document sections below, where required, h
19、ave been updated from ATIS 0100514.2009 Network Performance Parameters and Objectives for Dedicated Digital Services SONET Bit Rates. Additional or more detailed information can be obtained from ATIS 0100514.2009 if needed. This standard covers dedicated digital services operating at the nominal 51.
20、84 Mbit/s, 155.52 Mbit/s, 622.08 Mbit/s, 2.488 Gbit/s, and 9.865 Gbit/s interface rates of the SONET (Synchronous Optical Network) digital hierarchy. Rates above 9.865 Gbit/s and SONET virtual tributaries are for further study at PRQC. 2 Reference Model The performance of dedicated digital networks
21、shall be specified in terms of the reference model in Figure 1. End-to-end performance shall be specified from NI-to-NI with performance allocated for NI-to-INI (access) and INI-to-INI (transit). For intra-network connections (no INIs), end-to-end performance shall apply. Since dedicated digital ser
22、vices are characterized by established connections (i.e., no access or disengagement phases) with a constant rate of data transfer, entry and exit events consist solely of user information bits crossing a network interface. End UserEnd UserTransit NetworkAccess NetworkAccess NetworkFigure 1 - Refere
23、nce Model - SONET Dedicated Digital ServiceNINIINIININOTES NI - Network Interface INI - Internetwork Interface: INIs are only present when the service is provided across multiple networks. Where a point of termination (POT) exists, it will coincide with an INI.3 Error Performance Parameters and Bloc
24、k Sizes These guidelines are based on the error performance measurement of blocks. As defined, a block is a set of consecutive bits associated with the connection; each bit belongs to one and only one block. 5 4 Block Size The following block sizes are given in assessing performance. Table 1 - Block
25、 Size Rate (Mbit/s) 51.84 (STS-1) 155.52 (STS-3c) 622.08 (STS-12c) 2,488.32 (STS-48c) 9,865.28 (STS-192c) Bits/block 6,264 18,792 75,168 300,672 1,202,688 The block size corresponds to the number of bits in 125 microseconds for the SONET path (equivalent to synchronous payload envelope (SPE); 50.112
26、 Mbit/s, 150.336 Mbit/s, 601.344 Mbit/s, 2.405 Gbit/s, and 9.622 Gbit/s for STS-1, STS-3c, STS-12c, STS-48c, and STS-192c paths, respectively. A path that is multiplexed to a higher rate should be measured at its demultiplexed, original rate. Performance objectives apply at these rates to the SONET
27、path that is not constrained to a particular physical signal type (i.e., objectives apply for electrical (STS-n) or optical (OC-n) signals). See Annex A in ATIS 0100514.2009 Network Performance Parameters and Objectives for Dedicated Digital Services SONET Bit Rates for further details on block meas
28、urement with SONET path measures. 5 Percent Errored Seconds (% ES) 100 x the ratio of ES to total seconds in available time during a fixed measurement period. 6 Percent Severely Errored Seconds (% SES) 100 x the ratio of SES to total seconds in available time during a fixed measurement period. 7 Bac
29、kground Block Error Ratio (BBER) The ratio of Background Block Errors (BBE) to total blocks in available time during a fixed measurement interval. The count of total blocks excludes all blocks during SESs. Note - Background Block Error Ratio (BBER) does not include errored blocks occurring as part o
30、f SES. 8 Severely Errored Period Intensity (SEPI): The number of SEP events in available time, divided by the total available time. NOTE - The SEPI parameter has a unit of (1/s). This is to enable any SEPI objective to be easily translated to the equivalent number of SEP events over a specific measu
31、rement interval. It should be noted that the SEP event has no significance over a time interval of less than three seconds. 6 9 Test Design 9.1 Acceptance Tests Acceptance test measurements are made upon completion of a new service installation. Threshold levels for these tests are generally more st
32、ringent than the pro-rated levels derived from the associated long term objective, to provide a greater assurance that a circuit meets a specified performance level. This approach minimizes the probability that the circuit will require corrective maintenance. 9.2 Repair Verification Tests Repair ver
33、ification tests are made upon completion of a repair activity. Threshold levels for these tests are the same as acceptance tests levels to ensure that a circuit will meet specified performance levels. 9.3 Trouble Verification Tests Trouble verification tests are made in response to a trouble indicat
34、ion. Trouble verification is an internal responsibility of the provider and is, therefore, not covered in this standard. 10 Performance Determination 10.1 Parameters Measured For digital services operating at rates of 51.84 and 155.52 Mbit/s, the appropriate measures are percent ES and percent SES.
35、For the 622.08 Mbit/s rate and higher rates, the appropriate measures are BBER and percent SES. The appropriate block size (number of bits per block) for each bit rate is given in Table 1. 10.2 Test Duration Test durations have been specified from 1 hour to 24 hours. For the shorter test durations,
36、sequential tests are specified; for the longer 24 hour duration only one test is specified. In-service monitoring, where available, may be used over longer periods of time to confirm conformance to long-term objectives. 11 Service Performance Testing For each service included in this section, the fo
37、llowing is provided: test criteria, sequential test procedures and performance value tables. The specified procedure applies to acceptance and repair verification tests (not trouble verification). Each procedure includes the following: the parameters to be measured, the duration of a single test sta
38、ge, the number of sequential stages to be conducted, and performance determination criteria. The performance value tables include the threshold performance parameter values for each of the above tests. For each service there are two tables, one for test criteria and one for test limits. The sequenti
39、al short duration tests are structured in stages with one of three outcomes after each stage: acceptable performance, indicating confidence that the circuit under test will satisfy the long-term objective; unacceptable performance, indicating confidence that the circuit under test will not satisfy t
40、he long-term objective; or inconclusive, indicating insufficient evidence at this stage to predict the long-term performance (i.e. marginal). If at any stage the test indicates acceptable or unacceptable performance, the test is terminated. If the test is 7 inconclusive at the first stage, the proce
41、dure shall be continued to the second stage. Testing for longer periods such as 24 hours or continuous monitoring will provide greater confidence and should be considered for marginal circuits. For the test specified, all measurements are to be made at the bit rate of the service. Tests conducted in
42、trusively shall be the PRBS (Pseudo Random Binary Sequence) pattern appropriate for the service rate under test. Non-intrusive testing methods should be used where available. 12 Tests for 51.84, 155.52, 622.08 MBIT/S, 2.488 GBIT/S, and 9.865 GBIT/S Services These are services with actual user payloa
43、d capacity of up to 49.536, 149.760, 600.768 Mbit/s, 2.404 Gbit/s, and 9.621 Gbit/s respectively. Payload capacity is 576 kbit/s less than the SPE capacity to allow for the nine path overhead bytes in each 125 microsecond block. Test criteria are provided in Table 2. Table 2 - Test Criteria Bit Rate
44、 51.84 Mbit/s (STS-1) 155.52 Mbit/s(STS-3c) 622.08 Mbit/s (STS-12c) 2.488 Gbit/s (STS-48c) 9,865 Gbit/s (STS-192c) Parameters ES, SES, SEP ES, SES, SEP BBE, SES, SEP BBE, SES, SEP BBE, SES, SEPTest stage duration Short Long 1 Hour 24 Hour 1 Hour 24 Hour 1 Hour 24 Hour 1 Hour 24 Hour 1 Hour 24 Hour N
45、umber of stages Short duration Long duration 1 or 2 1 1 or 2 1 1 or 2 1 1 or 2 1 1 or 2 1 Test limits Table 5 Table 6 Table 7 Table 8 Table 9 NOTE: Use of the SEP parameter for test criteria is for further study. 13 Test Procedures 13.1 Short Duration Tests Up to two sequential one hour stages shall
46、 be conducted to validate the general performance of the service. The service performance shall be considered acceptable and the test terminated if, after one hour, the test results for all parameters do not exceed the limits for the 1 hour tests in the table for the service (table 3, 4, 5, 6, 7, or
47、 8). The service performance shall be considered unacceptable if any test result is greater than the 2 hour limit. If the test result is between these two limits, continue the test. After two hours the service performance shall be considered acceptable if the test results do not exceed the limits in
48、 the table for the service (table 3, 4, 5, 6, 7, or 8) for the two hour test. If the test result is unacceptable after the two hour limit, the circuit will be referred for trouble isolation. In addition, if the circuit test results are marginal, additional long duration testing or continuous monitor
49、ing testing should be performed. The tests limits as shown in Tables 3 - 8 are recommended values and may be modified by bi-lateral agreement between the interconnected parties. 8 13.2 Long Duration Tests Long duration (i.e. 24 hour) test should be performed when results from short duration testing indicates marginal performance. If a 24 hour test is performed, the service performance shall be considered acceptable if the results for each parameter measured do not exceed the 24 hour limits in the table for the service (table 3, 4, 5, 6, 7or 8). The test limits as shown in tables
