1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 - TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU-!).4%.!.#%G0 G0G0).42/$5#4)/.!.$G0G0%.%2!,G0G002).#)0,%30%2 i.e., maintenance ( 2), verification ( 3.1) orcharacterization ( 3.2);b) the amount of data and their resolution should be adjusted so as to minimi
2、ze the amount of data collected,stored and reported consistent with the uses of performance monitoring data in 2.3.1;c) the data should be of a form which allows comparison of performance among different transmissionsystems and equipment;d) for each data element it is important to select an appropri
3、ate measurement time interval.2.4 Types of interfaces to monitoring equipment2.4.1 For specific applications, Administrations should consider using a serial interface for transfer of performancemonitoring data between the monitored entity and the equipment which is monitoring it. To derive maximum b
4、enefit inusing the performance monitoring data, very fine resolution for representing each data element may be necessary. Thismay imply that an impractically large number of wires may be required if a serial interface is not used. For otherapplications where little performance data is transferred or
5、 where each performance data element can be represented withfew levels of coarse resolution, a discrete interface may be appropriate (see 4.3 of Recommendation M.32).2.4.2 It is recommended that Administrations evaluate both interface arrangements using the above considerationsand use the one which
6、is most economical and feasible for the specific application.2.5 Data collection and report screening2.5.1 Performance monitoring implies the collection of data from transmission systems and equipment which may beperforming satisfactorily a large portion of the time they are monitored. To meet the o
7、bjectives for performancemonitoring, a means of screening the data is desirable so that only useful information is provided. Administrationsshould base the amount of screening on the desired maintenance staff responses and the processing, storage andcommunications needs related to the data quantitie
8、s.Fascicle IV.1 - Rec. M.34 32.5.2 As an example of screening, consider the case where there are two thresholds available in a remotely locatedperformance monitoring equipment. For a particular monitored entity, a storage threshold may be used such thatperformance data for that entity measured over
9、a given time interval need not be stored or reported unless the thresholdis exceeded. Then a deferred maintenance alarm threshold may be used such that when the performance data exceedsthis threshold, the monitoring equipment will not only store the data but also generate a deferred maintenance alar
10、m.2.5.3 Note that in a system in which processing is shared between remotely located monitoring equipment and acentral processor, the central processor may contain thresholds which may be used to further screen or processinformation reported to the maintenance staff.3 Other possible uses of performa
11、nce monitoring dataIn addition to maintenance, performance monitoring data may be used for:a) verification of transmission system or equipment performance objectives,b) characterization of transmission systems and equipment.3.1 The verification of objectives is concerned with the transmission system
12、s and equipment as a whole and howwell the analogue or digital signal streams are being delivered to the aggregate of customers using these systems andequipment. Thus, even if a particular regular equipment is operating poorly, when a protection equipment is operatingproperly, signal streams are sti
13、ll being delivered to customers intact. Thus, monitoring for verification of objectivesshould usually be done only when the equipment which is the object of the verification is carrying live traffic. Themonitored verification data can be used to give a general picture of the performance of the trans
14、mission system andequipment, construct network measures, and verify that transmission objectives are being met.3.2 Characterization includes collection of data that may be used by transmission system and equipment designers.This type of data is often very specialized, and often must be collected in very large quantities in order to do anappropriate system characterization. It is also often collected with monitoring equipment specifically designed for thepurpose.
