ITU-R F 1330-2-2006 Performance Limits for Bringing into Service the Parts of International Plesiochronous Digital Hierarchy and Synchronous Digital Hierarchy Paths and Sections Im字中.pdf
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1、 Rec. ITU-R F.1330-2 1 RECOMMENDATION ITU-R F.1330-2*Performance limits for bringing into service the parts of international plesiochronous digital hierarchy and synchronous digital hierarchy paths and sections implemented by digital fixed wireless systems (Question ITU-R 161/9) (1997-1999-2006) Sco
2、pe This Recommendation provides BIS performance limits for international PDH and SDH paths and sections implemented using FWS. The approach is aligned to the ITU-T BIS approach, but some media-specific (FWS) aspects are incorporated. The Annex details the application of the performance limits for BI
3、S. The ITU Radiocommunication Assembly, considering a) that digital fixed wireless systems for use in constant bit-rate digital paths at or above the primary rate in the international portion of a 27 500 km hypothetical reference path (HRP) are being designed; b) that there is a need to specify “bri
4、nging into service” (BIS) performance limits for digital fixed wireless systems; c) that the performance limits and procedures for maintenance activities for digital fixed wireless systems have been defined in Recommendation ITU-R F.1668; d) that ITU-T has prepared performance limits for bringing-in
5、to-service and maintenance of international multi-operator plesiochronous digital hierarchy (PDH) path, connections in ITU-T Recommendation M.2100 and for international multi-operator synchronous digital hierarchy (SDH) paths and international SDH multiplex sections in ITU-T Recommendation M.2101, b
6、eing based on ITU-T Recommendation G.826 and G.828 respectively; e) that ITU-T Recommendation M.2110 provides procedures for the BIS of international multi-operator digital paths, sections and transmission systems with and without in-service monitoring (ISM); f) that ITU-R has approved Recommendatio
7、n ITU-R F.1660 for error performance objectives for real digital fixed wireless links used in 27 500 km hypothetical reference paths and connections; g) that propagation conditions may adversely affect the BIS procedures for digital fixed wireless systems; h) that the influence of propagation condit
8、ions on the BIS procedures for digital fixed-wireless systems currently under study in Radiocommunication Study Group 3; *This Recommendation should be brought to the attention of Radiocommunication Study Groups 3 and 4, and Telecommunication Standardization Study Groups 4 and 13. 2 Rec. ITU-R F.133
9、0-2 j) that performance limits and procedures for the BIS of PDH and SDH constant bit rate paths and sections based on digital fixed-wireless systems should be defined; k) that BIS performance objectives (BISPOs) should take into account a suitable margin, to minimize subsequent maintenance interven
10、tions; l) that due consideration of propagation conditions should be taken when undertaking BIS measurements; noting a) that for the purpose of allocating the performance objectives for the international portion of a constant bit rate path at or above the primary rate using digital fixed-wireless sy
11、stems, an international digital path has been partitioned in geographical terms; these portions have been titled path core elements (PCE). Two types of international PCE are used: an international PCE (IPCE) between an international gateway and a frontier station in a terminating country, or between
12、 frontier stations in a transit country (see Note 1); an inter-country PCE (ICPCE) between the adjacent frontier stations of the two countries involved. The ICPCE corresponds to the highest order digital path carried on a digital transmission system linking the two countries; recommends 1 that the l
13、imits for BIS should be based on end-to-end reference performance objectives (RPOs) shown in Tables 1a and 1b as well as allocations shown in Table 2; TABLE 1a (See Note 2) RPO PDH Primary (Note 4) Secondary Tertiary Quaternary SDH (Mbit/s) 1.5 to 5 5 to 15 15 to 55 55 to 160 160 to 3 500 Parameter
14、End-to-end RPO Errored seconds ratio (ESR) for paths designed according to G.826 0.02 0.025 0.0375 0.08 Not applicable (NA) Errored second ratio (ESR) for paths designed according to G.828 0.005 0.005 0.01 0.02 (NA) Background block error ratio (BBER) for SDH paths designed according to G.828 2.5 10
15、5 2.5 105 2.5 105 5 105 5 105 Severely errored seconds ratio (SESR) 0.001 0.001 0.001 0.001 0.001 Rec. ITU-R F.1330-2 3 TABLE 1b RPO for end-to-end international SDH multiplex sections Rate STM-0 STM-1 STM-4 Blocks/second 64 000 192 000 768 000 ESR (according to G.826) 0.0375 0.08 NA ESR (according
16、to G.828) 0.01 0.02 NA SESR 0.001 0.001 0.001 BBER (according to G.826) NA NA NA BBER (according to G.828) 2.5 105 5 105 5 105 TABLE 2 Allocation, an PCE classification (see Note 3) Allocation (% of end-to-end RPOs) IPCE Terminating/transit national networks: d 100 km 1.2 100 km 7 500 km 10.0 ICPCE
17、d 300 km 0.3 International multiplex section 0.2 2 that the allocated performance objective (APO) and the BISPO for the BIS of a path and a multiplex section should be calculated as follows: for a path APOes= A% RPOes TP 100 (convert A% to ratio) APOses = A% RPOses TP 100 (convert A% to ratio) APObb
18、e= A% RPObbe TP 2 000 100 (convert A% to ratio VC-1 and 2) APObbe = A% RPObbe TP 8 000 100 (convert A% to ratio VC-3 and 4 and VC-4-Xc) 4 Rec. ITU-R F.1330-2 for a multiplex section APOes = A% RPOes TP 100 (convert A% to ratio) APOses = A% RPOses TP 100 (convert A% to ratio) APObbe = A% RPObbe TP 64
19、 000 100 (convert A% to ratio STM-0) APObbe = A% RPObbe TP 192 000 100 (convert A% to ratio STM-1) APObbe = A% RPObbe TP 768 000 100 (convert A% to ratio STM-4) where: A% = anN1% for a path i.e., A% = a1% + a2% + . + aN% an: allocation for each IPCE and ICPCE forming the path A% = a% for a multiplex
20、 section TP : test period (s) BISPO = APO /Fm where Fm is the maintenance margin; 3 that for the definition of BISPO the following maintenance margin Fm should be specified: TABLE 3 Maintenance margins, Fm Maintenance margin, Fm For normal propagation conditions (Note 5) For adverse propagation cond
21、itions (Notes 5 and 6) PDH paths and sections SDH paths 2 0.5 PDH transmission systems SDH multiplex sections 10 0.5 4 that test periods (TPs) for BIS of digital fixed wireless systems have been designed as follows: for all radio paths and sections, a 24-h BIS test period should be used and the perf
22、ormance must satisfy the calculated S24limits for each error performance parameter (see Annex 1); for radio paths and sections with performance falling between the S1 and S2 performance limits during the 24-h test period and that are continuously monitored during operation (with in-service monitorin
23、g (ISM), a further extended 7-day BIS test period should be undertaken; for radio paths and sections with performance falling between the S1 and S2 performance limits during the 24-h test period and that are not monitored during operation (non-ISM), provisional acceptance or BIS re-testing should be
24、 undertaken, subject to agreement between the parties; Rec. ITU-R F.1330-2 5 for new radio paths and sections over routes where no radio paths or sections are present and during periods of adverse propagation conditions, an extended 7-day BIS testing period should be used and the performance must sa
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