Improvement of Call completion ration in CDoT Xge

H:\MAX\LECTURE\CCRIMPROVEMENT 1C-DOT Proprietary

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CCR IMPROVEMENT IN CCR IMPROVEMENT IN CCR IMPROVEMENT IN CCR IMPROVEMENT IN CCCC----DOT EXCHANGEDOT EXCHANGEDOT EXCHANGEDOT EXCHANGE


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CCR – CALL COMPLETION RATIO

CSR – CALL SUCCESS RATIO

Certain TerminologiesCertain TerminologiesCertain TerminologiesCertain Terminologies


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CATEGORY OF CALLSCATEGORY OF CALLSCATEGORY OF CALLSCATEGORY OF CALLSOriginating & Terminating Call (ORGOriginating & Terminating Call (ORG--TRM)TRM)

All Local Call (Intra BM + Inter BM + AN-RAX + WLL)

Total Local Call Attempts (i.e. Dial Tone Given)Total Successful Call Attempts (i.e. Call Processed)Total Completed Call Attempts (i.e. Answer Calls)


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CATEGORY OF CALLSCATEGORY OF CALLSCATEGORY OF CALLSCATEGORY OF CALLSOriginating & Outgoing Call (ORGOriginating & Outgoing Call (ORG--OG)OG)

All Route Call & MultiOperator CallsTotal Outgoing Call Attempts (i.e. Dial Tone Given)Total Successful OG Call Attempts (i.e. Call Processed / State of Call received)Total Completed Call Attempts (i.e. Answer Signal Received)

Terminating Call (IC-TRM)All Local/Route Terminating Calls

Total Terminating Call AttemptsTotal Completed Terminating Attempts (i.e. Answered Calls)


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CALL FAILURE ANALYSISCALL FAILURE ANALYSISCALL FAILURE ANALYSISCALL FAILURE ANALYSISAbandoned After Dialing CompleteAbandoned After Dialing Complete.

ØDue to Subscriber’s Behavior.ØDue to More Nodes in Network.

No AnswerNo Answer.ØDue to Subscriber’s Reason.ØDue to Seasonal/Climatic Cause.ØDue to Technical Reasons.

Called Subscriber BusyCalled Subscriber Busy.ØHeavy Callers/Hospitals/Helpline Nos.

Partial DialingPartial Dialing.ØDue to Subscriber’s Behavior

No Digits DialedNo Digits Dialed. (This Contribute 25% failure)ØDue to Subscriber’s Behaviour (Check Dial Tone /

Flashing Hook before Dialing)


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INTERNAL REASONSINTERNAL REASONSINTERNAL REASONSINTERNAL REASONS

Scope of Improving CCR.Scope of Improving CCR.

Feed the Dial Tone in Time.Feed Proper Announcement.Check the various Call Processing Parameters.Check the Resource Allocation.Provide Adequate Trunk Circuits.Routine Testing of CM & BM Hardware.Data Check to Avoid No-answer.


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SOLUTION TO SWITCH(INTERNAL) SOLUTION TO SWITCH(INTERNAL) SOLUTION TO SWITCH(INTERNAL) SOLUTION TO SWITCH(INTERNAL) REASONREASONREASONREASON

Dial Tone Delay & NoDial Tone Delay & No--Dial Tone.Dial Tone.All subs. Should be of DTMF(PSTN+AN) and instrument should be modified for Tone Working.All Line BM,RBM & VU-BM should be equipped 4MFC cards and all ports are configured as DTMF.Routine testing of MFC cards using tst-srv:301 using calendar.

Feed Proper Announcement at Appropriate Time.Feed Proper Announcement at Appropriate Time.Announcement card should be equipped & inservice in all BMs.Proper OG-barring, Feature Invocation announcement.Q-annc in case of busy subs. if assigned “calledcalled--callcall--waitingwaiting”. Do wide publicity to popularize call-waiting facilities.


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SOLUTION TO SWITCH(INTERNAL) SOLUTION TO SWITCH(INTERNAL) SOLUTION TO SWITCH(INTERNAL) SOLUTION TO SWITCH(INTERNAL) REASONREASONREASONREASON (CONTD.)(CONTD.)(CONTD.)(CONTD.)

Check Call Processing.Check Call Processing.For effective call check the following System Parameters.

ROUTING: Minimum digits required for processing route call in open-number scheme. It should be 6.MIN-SUBS-DIAL: Minimum digits required for processing local call.DNA-TMR: This parameter is effective for Diversion on No-Reply. It should be 280.

Resource Allocation.Resource Allocation.In Line BM/RBM/VU-BM all 4MFCs should be created as DTMF.In Trunk BM equip all 4 MFCs as MF-SENDR/MF-RCVR for MOD-R2 Calls.


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Providing Adequate Trunk Circuits.Providing Adequate Trunk Circuits.Sufficient junction should be provided towards TAX/Parent Exchg. as the call should not fail due to Non-availability of Trunks.For the improvement of ORG-OG traffic efficiency, test DTS/DTCs on routine basis.TUC should be interchanged & Tested regularly.Other than 2_2_(7.7)_6 s/w rel., 21st slot/4th TU should not be equipped.


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Check of CM & BM Hardware.Check of CM & BM Hardware.Routine Testing CM Hardware (BUS Wise & Plane Wise) to avoid one way speech and cross-talk related problem.Testing of TIC/SPC cards on routine basis using the cmdfile.

Data Check for Avoiding NoData Check for Avoiding No--Answer Case.Answer Case.Check System Parameters to reduce NoCheck System Parameters to reduce No--Answer Case.Answer Case.

For Exchange Type :2(Working as Local For Exchange Type :2(Working as Local ExchgExchg.).)

CSH:600CL-RINGING:600

For Exchange Type :4(Working as TAX/ILT)For Exchange Type :4(Working as TAX/ILT)

RING-TAX-TM-OUT:600CSH-TAX-TM-OUT:300


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Threshold ParametersThreshold ParametersThreshold ParametersThreshold Parameters

Threshold % should be Calculated for CCS#7 and V5.2 based on the number of :

FOR CCS#7 DATA (Applicable to Complete System)ØNo. of DATA Links (NO7-THR).ØNo. of BMs having #7 TGPs (INT-THR).

FOR VUBM DATA (Applicable per VU BM basis)ØNo. of Terminal for Internal Comm. (VU-INT-THR)ØNo. of Links for VU Interface (V5-THR)


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Different Numbering SchemeDifferent Numbering SchemeDifferent Numbering SchemeDifferent Numbering Scheme

OPEN Numbering SchemeØ The open numbering scheme is followed in the stages

of the network where the exchange either routes the call to a TANDEM/TAX and not aware of the details of numbering scheme/number length of the destination.

CLOSE Numbering SchemeØ The closed numbering scheme is followed in the

stages of the network where the exchange either terminates the call or routes the call directly to a terminating exchange and is aware of the details of numbering scheme/number length of the destination.


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SIGNALLINGSIGNALLINGSIGNALLINGSIGNALLING


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Originating Exch.

Originating Exch.

Terminating Exch.

Terminating Exch.

Transit Exch.

Transit Exch.

END-TO-ENDEND-TO-END

ENDENDENDEND----TOTOTOTO----ENDENDENDEND

In End-to-End mode, Signaling is between Originating Exchange and Terminating Exchange thus signals can be transferred very quickly.


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Originating Exch.

Originating Exch.

Terminating Exch.

Terminating Exch.

Transit Exch.

Transit Exch.

LINK BY LINKLINK BY LINK

LINK BY LINKLINK BY LINKLINK BY LINKLINK BY LINK

In Link-by-Link mode, Signal is between Two Nodes only thus slowing down the Transfer of the Signal.



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TYPE OF TYPE OF TYPE OF TYPE OF TAXsTAXsTAXsTAXs

Leading TAXLeading TAXØ First TAX in the Network has to Function as a Leading

TAX.

Transit TAXTransit TAXØ This is doing only Transiting Function and no TAX

business. It passes all the digits.

Terminating TAXTerminating TAXØAbsorbs Area Code and sends exchange digits to the

Terminating Exchange using appropriate Rank Of Digit.


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ORG Exch.ORG Exch.

Terminating TAX

Terminating TAX

Leading TAX

Leading TAX


TYPES OF TAXTYPES OF TAXTYPES OF TAXTYPES OF TAXEND-TO-ENDEND-TO-END

TransitTAX

TransitTAX

TRMExch.TRMExch.OG TGP-

TYP=TTAXOG TGP-

TYP=TTAX

IC TGP-TYP=ORDIC TGP-

TYP=ORD

OG TGP-TYP=TTAXOG TGP-

TYP=TTAX

IC TGP-TYP=TTAX

IC TGP-TYP=TTAX

OG TGP-TYP=TTAXOG TGP-

TYP=TTAX

IC TGP-TYP=TTAX

IC TGP-TYP=TTAX

OG TGP-TYP=ORDOG TGP-

TYP=ORD

IC TGP-TYP=TTAX

IC TGP-TYP=TTAX


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PROGRAMING OF PROGRAMING OF PROGRAMING OF PROGRAMING OF TGPsTGPsTGPsTGPs

ALL THE I/C TRK GROUPS FROM TAX OR ILT SHOULD BE PROGRAMMED AS TTAX WITH THE UNIQUE 'TGP-CAT' OTHER THAN '1' AND NOT ALLOCATED TO ANY OTHER TGP.

ALL THE I/C TGPs FROM THE PARENTED EXCHANGES (IN TAX) SHOULD BE DEFINED AS 'ORD'.

PROPER CHARGE RATE NUMBER FOR I/C CALLS FROM OTHER TAXs FOR WHICH OUR TAX IS NOT A LEADING TAXØ CRG-RTN (=4) WITH

CHARGE MODE = NO-METMETERING INFO = METERED/ANS-XP/NRM-RNG

Ø NO CHARGE BAND SHOULD BE ASSOCIATED WITH THIS CRG-RTN


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SUBS. PRIORITYSUBS. PRIORITYSUBS. PRIORITYSUBS. PRIORITYSubscriber Priority (SUBSubscriber Priority (SUB--PRI)PRI)

This Parameter is used for assigning preference to Subscriber LINES.ØPriority 1 to 8 assigned by CRP CommandØPriority 9 to 14 assigned by the system

Spare11,14

Operator13

PBX12

CCB-STD10

ORD-CCB9

Priority Subscriber2,3,4,5,6

Ordinary Subscriber1,7,8

MeaningSUB-PRI at LE


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In MFIn MF--R2 R2 SignallingSignallingSubs Priority 2 to 6 is send as Priority Subs.In Terminating Exchange if Priority 2 is not allowed in TGP-Choice field then call will fail.If Priority 13 is not allowed TO calls from the Network will fail.In case of Subs Priority 9,10&12 Local Incoming TGP-PRI data takes precedence at Transit Exch.

PRIORITY ROUTINGPRIORITY ROUTINGPRIORITY ROUTINGPRIORITY ROUTING


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PRIORITY ROUTINGPRIORITY ROUTINGPRIORITY ROUTINGPRIORITY ROUTINGIn CCS#7 In CCS#7 SignallingSignalling

Except Trunk Operator & Ordinary Except Trunk Operator & Ordinary Calling Subs, all other Priority Subs in Calling Subs, all other Priority Subs in the Transit Network Selection are the Transit Network Selection are Treated as Priority=1 for the purpose of Treated as Priority=1 for the purpose of Outgoing Trunk Selection irrespective Outgoing Trunk Selection irrespective

of Incoming TGP Priority.of Incoming TGP Priority.


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SUGGESTIONSUGGESTIONSUGGESTIONSUGGESTION

Always create Two or Three smaller size TGPs with TENs from Two/Three BMs. TGP choice in rotating order for different route codes and for different priorities.

(Advantage: Processor Load & Trunk Selection Time will Decrease considerably)

For Non-Metered Special Service routes, Non-Metered type CRG-RTN should be given instead of PRD-TAX.End-to-End MF Signalling can be adopted, wherever possible.Use proper TGP-TYPE and EXCH-TYPE.

Improvement of Call completion ration in CDoT Xge

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