ITU-T M 605-1988 ROUTINE MAINTENANCE SCHEDULE FOR INTERNATIONAL PUBLIC TELEPHONY CIRCUITS《国际公用电话电路例行维护进度表》.pdf

1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 - TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU-!).4%.!.#% ).4%2.!4)/.!,G0G04%,%0(/.%G0G0#)2#5)432/54).%G0G0-!).4%.!.#%G0G03#(%$5,%G0G0 an example of its use is givenin Figure 2/M.605.As far as possible the schedule is drawn up on the principle of batch m

2、easurements of circuits on a given routeand shows the days and times during which the routine maintenance measurements should be carried out.Each international test centre will require a set of eight forms to cover the four weeks of the odd and the fourweeks of the even months, four weeks constituti

3、ng a month for the purpose of the schedule.Week 1 is the first whole week of a month beginning with a Monday. Week 4 may include days belonging tothe following calendar month.Odd months denotes January, March, May, etc., and even months February, April, etc.The schedule form allows for simultaneous

4、testing on two different routes where two test positions areprovided for routine measurements. If more than two routine test positions are available, additional or suitably modifiedforms will be required.2.2 Arranging the scheduleThe periodicity for circuit routines should be determined from Recomme

5、ndation M.610.The total time required to routine test all the circuits on a route should be assessed. It will depend on:a) the total number of circuits,b) the type of measurements and tests to be made, andc) the expected rate of completion of routines for each circuit.The determination of item c) wi

6、ll require particular care. The duration of circuit routines may be expected todiffer from one test centre to another due to the different facilities provided: for example, circuit test accessarrangements, and the organization of the work. Thus, no guidance can be given to the expected rate of compl

7、etion ofroutines.To reduce the need to make frequent changes to the schedule, due allowance should be made for any plannedincrease of the number of circuits on a route.The individual testing periods may be of 1, 2, 3 or 4 hours duration. Where the total routine time required for aroute would make a

8、single testing period impracticable, two or more testing periods should be allocated to the route, butthese periods should be separated in time by at least 4 hours._1)In some Administrations this function may be delegated by the technical service, but in all cases the technical services areresponsib

9、le for ensuring the satisfactory preparation and application of the schedule.2 Fascicle IV.1 - Rec. M.605The days and times of the testing periods will be decided by a bilateral agreement between the two technicalservices concerned. To initiate the scheduling of routines for a route, the technical s

10、ervice to which the circuit controlstation is responsible should request copies of the current schedule form from the distant end technical service. Thecontrolling end technical service should indicate on the forms the day(s) and time(s) it proposes, choosing anyunallocated periods on the forms for

11、this purpose. The forms should then be returned to the distant technical service andagreement sought on the proposals2).It is intended that individual testing periods be allocated to the circuits of one control station only. However,subject to the bilateral agreement between the two technical servic

12、es involved, individual testing periods may be used ona common basis for the circuits of both control stations.2.3 Use of echo canceller devicesThe number of echo cancellation stages and the echo path delay characteristics must be stated in order toprogram tests properly using the echo canceller tes

13、t facility as specified in Recommendation O.22 1. Thesecharacteristics should be included in ATME No. 2 schedule forms when exchanged between Administrations. IfATME No. 2 is not used between Administrations, echo canceller delay information should be conveyed by othermeans, for example a telex mess

14、age, or the manual routine testing schedule (Figure 1/M.605).2.4 Changes to the scheduleAs far as possible testing periods should be chosen so that new circuits can be incorporated without change tothe schedule.Modifications to the days and/or times of testing for existing circuits, or expansion of

15、the schedule toaccommodate additional circuits or new routes should be determined by the technical service to which the circuit controlstation is responsible, in agreement with the other interested technical service(s). If the technical service responsible for acircuit sub-control station considers

16、it necessary to alter the routine maintenance schedule, it should propose changes andobtain the agreement of the technical service responsible for the control station. Any intended modifications or additionsto the schedule should be entered in red on a current copy which should be forwarded to the d

17、istant technical service(s)concerned. Agreement or counterproposals can then be made by any suitable means3).2.5 Programming of routine measurements and testsIt is the responsibility of each Administration to decide how the agreed scheduled test periods should beutilized for the effective completion

18、 of routines on the circuits it controls.This will involve determining the type of measurements and tests to be made on each circuit taking intoaccount the recommended periodicities.2.6 Unscheduled periodsAvailable periods in the schedule which are unallocated may be used for any purpose relating to

19、 circuitroutines. Such use is on an ad hoc basis and each occasion must be agreed by the terminal control and sub-controlstations concerned.3 Circuit routines by automatic transmission measuring equipment ATME No. 23.1 Schedule formFor the orderly and effective use of ATME for circuit routines it is

20、 necessary to schedule its use.For each distant end international centre an Administration will require the following information to enable itto make proposals for ATME routines on the circuits for which it has control responsibility:a) type and quantity of responding facilities at distant end;b) pe

21、riods when distant end responding facilities are not scheduled for use;c) periods to be avoided due to exchange peak traffic at distant end._2)In some Administrations this function may be delegated by the technical service, but in all cases the technical services areresponsible for ensuring the sati

22、sfactory preparation and application of the schedule.3)In some Administrations this function may be delegated by the technical service, but in all cases the technical services areresponsible for ensuring the satisfactory preparation and application of the schedule.Fascicle IV.1 - Rec. M.605 3This in

23、formation should be applied by the distant end Administration on request and use of a standard form forthis purpose is considered necessary. The form to be used is shown in Figure 3/M.605; an example of its use is given inFigure 4/M.605. Weeks 1, 2, 3 and 4 and odd and even months are as defined in

24、2.1 above.For ATME No. 2, three types of responding facilities are possible (see Recommendation O.22 1):type a for signalling tests and transmission measurements;type b for signalling tests only;type c for busy flash tests.Two forms will be required for each type a and b responding equipment to cate

25、r for odd and even months. Ifthe controlling end wishes to conduct routines at monthly or more frequent intervals then appropriate entries will need tobe made on both odd and even month forms.The type of ATME No. 2 responding equipment (type a or b ) needs to be entered on the form. Each formshould

26、be given a unique reference number for administrative purposes.Although two forms are required for each type a and b responding equipment, this does not imply that aparticular responding equipment of the required type will be accessed. This will depend on local incoming arrangements.Separate forms a

27、re not required for type c responding facilities. Where busy flash tests are to be made at thesame time as transmission and/or signalling routines they should be considered as an extension of these routines and dueallowance should be made for them when estimating the scheduled testing time required.

28、 An indication to show if type cresponding facilities are or are not provided should be given on the schedule forms for type a and b responders.The incoming access address for each type of responding facility is standard for each signalling system (see theRecommendation cited in 2) and need not be e

29、ntered on the schedule form.3.2 Arranging the scheduleThe technical service of an Administration wishing to commence routine testing using its ATME directingequipment, or to modify its routine programme, should request a copy of the current schedule of responding equipmentavailability for the distan

30、t international centre(s) of interest from the technical service concerned. This schedule will beentered on the form given in Figure 3/M.605.The technical service at the controlling (i.e., directing equipment) end should indicate the test period(s) itproposes on the schedule and return it to the dis

31、tant end for agreement.The technical service at the controlling end will need to take the following factors into consideration whendetermining the test periods required on a route:a) circuit routine periodicity (from Recommendation M.610);b) total routine time for all circuits on the route. This wil

32、l depend on:i) total number of circuits;ii) type of tests and measurements;iii) routine time for circuits;c) quantity of available responding equipments of required type at distant end (This is required when it isintended to test with more than one directing equipment simultaneously to the same dist

33、ant testingcentre.);d) quantity of directing equipments to be used;e) that test periods should be multiples of 1 hour;f) that busy traffic periods should be avoided.To reduce the need to make frequent changes to the schedule, due allowance should be made for any plannedincrease of the number of circ

34、uits on a route.3.3 Utilization of scheduled test periodsIt is the responsibility of each Administration to decide how the agreed scheduled test periods should beutilized for the effective completion of routines on the circuit it controls.4 Fascicle IV.1 - Rec. M.6053.4 Unscheduled periodsDemand tes

35、ting with ATME No. 2.During the busy traffic period, when ATME No. 2 is not being used for routine testing, it can serve the need topermit single and rapid circuit testing on a demand basis for fault location and for testing of individual circuits followingfault clearance, as well as for testing of

36、new circuits to be added. For this reason responding equipments should beavailable at all times. Demand testing of large numbers of circuits for whatever purpose should be agreed betweentesting centres concerned.3.5 Utilization of directing equipmentIn addition to a current schedule of the availabil

37、ity of responding equipments at each of its international centresfor the information of other Administrations, each Administration will have to maintain a schedule of the utilization ofits own directing equipments. This is a matter for each Administration to arrange and does not require formulating

38、byCCITT but the same type of form may also be used as indicated in Figure 5/M.605.3.6 Down time of ATME No. 2 equipmentIf ATME No. 2 equipment is to be out of service for a long period of time (several days), e.g. due to a faultcondition or rearrangements in the international centre, so that automat

39、ic testing cannot be carried out or is heavilyaffected, the Administrations concerned should be advised accordingly.Fascicle IV.1 - Rec. M.605 5d01-scFIGURE 1/M.605.D016 Fascicle IV.1 - Rec. M.605d02-scFIGURE 2/M.605.D02Fascicle IV.1 - Rec. M.605 7d03-scFIGURE 3/M.605.D038 Fascicle IV.1 - Rec. M.605d04-scFIGURE 4/M.605.D04Fascicle IV.1 - Rec. M.605 9d05-scFIGURE 5/M.605.D05References1 CCITT Recommendation CCITT automatic transmission measuring and signalling testing equipment ATMENo 2., Vol. IV, Rec. O.22.2 CCITT Recommendation Maintenance access lines, Vol. IV Rec. O.11.