ANSI ATIS 0900105.03-2013 Synchronous Optical Network (SONET) C Jitter and Wander at Network and Equipment Interfaces.pdf
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1、 AMERICAN NATIONAL STANDARD FOR TELECOMMUNICATIONS ATIS-0900105.03.2013 SYNCHRONOUS OPTICAL NETWORK (SONET) JITTER AND WANDER AT NETWORK AND EQUIPMENT INTERFACES As a leading technology and solutions development organization, ATIS brings together the top global ICT companies to advance the industrys
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5、TEL). For more information, visit . AMERICAN NATIONAL STANDARD Approval of an American National Standard requires review by ANSI that the requirements for due process, consensus, and other criteria for approval have been met by the standards developer. Consensus is established when, in the judgment
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10、the American National Standards Institute require that action be taken periodically 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 Di
11、sclaimer specific jitter generation requirements for individual network elements are in Table A.9. NOTE 2 - At the lower (high-pass) cutoff frequency F1or F2, the measurement filter is a first-order filter, which has a roll-off of 20 dB/decade. At the upper (low-pass) cutoff frequency F3, the measur
12、ement filter has a maximally-flat Butterworth characteristic and a roll-off of 60 dB/decade. NOTE 3 - For OC-192, the effect of dispersion and non-linearities on the eye opening and on the choice of this value is for further study. NOTE 4 The OC-768 (STM-256) values were taken from ITU-T G.825 Amend
13、ment 1. 6 Jitter on Payload Signals This clause provides specifications for jitter on payload signals from SONET networks due to mapping and pointer adjustments. The jitter specifications for DS1 and DS3 signals were developed based upon hypothetical SONET island network models and respective jitter
14、 budgets (Annex B for DS1 and Annex D for DS3), and the SONET timing short-term stability characteristics (in ATIS-0900101). More information on the effects of SONET on payload jitter can be found in T1.TR.17-1993. In addition, Table 2 lists the cutoff frequencies of the filters specified for use in
15、 the measurements described in this clause. Table 2 - SONET payload jitter measurement filter characteristics DSn level Lower cut-off frequencyNote 1(Hz) Minimum upper cut-off frequencyNote 2(kHz) DS1 10 40DS1A 20 100DS2 10 60 DS3 10 400NOTE 1 - At the lower (high-pass) cutoff frequency the measurem
16、ent filter is a first-order filter, which has a roll-off of 20 dB/decade. NOTE 2 - At the upper (low-pass) cutoff frequency the measurement filter is a first-order filter for DS1, DS2 and DS3, and has a maximally-flat Butterworth characteristic and a roll-off of 60 dB/decade for DS1A. ATIS-0900105.0
17、3.2013 6 6.1 Jitter Caused by Mapping 6.1.1 VT Level Payloads These requirements are specified to control jitter generated in the VT mapping process. The mapping jitter specifications for DS1 payloads when using the asynchronous mapping are given below in 6.1.1.1. For other VT level payloads when us
18、ing the asynchronous mapping, the stuffing mechanism that generates the C-bits (justification control bits) shall be chosen such that, given a desynchronizer whose characteristics are that of a second-order low-pass filter with the 3 dB bandwidths specified in Table 3, the output jitter shall be les
19、s than 1.0 UIppand 0.3 UIrms. The previous requirement assumes the following: There is no jitter or wander on the payload signal at the input to the SONET network; and There is no pointer adjustment activity. Table 3 - VT assumed desynchronizer bandwidths VT payload signal Desynchronizer bandwidth (
20、Hz) DS1A 300 DS2 5006.1.1.1 DS1 Payloads DS1 mapping jitter is specified such that the allocation allowed for asynchronous and SONET mapping jitter described in Annex B can be achieved. DS1 mapping jitter is the jitter on a DS1 signal caused by the process of mapping the DS1 payload into a VT1.5 SPE
21、 and then desynchronizing back to a DS1. The jitter on the DS1 payload signals out of a SONET island shall be less than 0.7 UIpp, given no jitter or wander on the DS1 payload as it enters the network and no pointer adjustment activity in the SONET network. To ensure synchronizer-desynchronizer inter
22、operability, the DS1 mapping mechanism shall meet the following requirement: The stuffing mechanism that generates the C-bits (justification control bits) shall be implemented such that, given a desynchronizer, the characteristics of which are that of the transfer mask given in Figure 1, the mapping
23、 jitter shall be no more than 0.7 UIpp. In addition, to limit jitter accumulation through tandem SONET islands, the following requirement applies to the DS1 desynchronizer: In the process of extracting the DS1 from the VT1.5 SPE, the mapping jitter shall be filtered by a desynchronizer whose transfe
24、r characteristic is under the mask given in Figure 1. ATIS-0900105.03.2013 7 0.1 40Jitter transfer (dB) Frequency (Hz) Slope = -20 dB/decade Figure 1 - Jitter transfer mask for DS1 and DS3 desynchronizers 6.1.2 STS Level Payloads 6.1.2.1 DS3 Payloads DS3 mapping jitter is specified such that the all
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