Routing and Switching in Telecommunications Network
Explore the process of call routing and switching in a telecommunications network, from call origination to termination. Learn how the network determines the calling number, routes calls based on portability, and directs them to the appropriate subscriber's line. Understand the role of different classes and the interplay between switches in ensuring successful call connections.
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Presentation Transcript
Pre NNP 1
Pre NNP A call is originated Originating Switching Network Determines Calling Number s presubscribed IXC IXC Queries Database for LRN Slides 14-22 Is the Dialed Number Local No Originating Switching Network Queries Database for LRN Slides 17-22 Yes Based upon query Response (CdPN/LRN,) Call is routed to Inter Switch trunk toward terminating network Yes IXC Switch determines if Dialed NPA NXX is portable Slides 7-13 Local Switch determines if Dialed NPA NXX is portable Yes Based upon query Response (CdPN/LRN,) Call is routed to Inter Switch trunk toward terminating network No Slides 3-6 No Call is routed to the appropriate terminating end office or network for termination to subscriber s Line Slides 14-16 Call is routed to the appropriate terminating end office or network for termination to subscriber s Line 2
Pre NNP PSTN Class 5 Non-portable NXX Intra Switch Local Call Routed to Subscriber Class 5 Switch A B C D E 3
Pre NNP PSTN Class 5 to Class 5 Non-Portable NXX Inter Switch Local Call Routed to Subscriber Class 5 Switch A B C D ISUP Trunk E F 4
Pre NNP PSTN Class 5 to Class 4 to Class 5 Non-Portable NXX Inter Switch Local Call Routed Direct to Subscriber Class 5 Switch Class 4 Switch A B C D ISUP Trunk E F 5
Pre NNP PSTN Class 5 to Class 4 to Class 5 Non-Portable NXX Inter Switch Local Call Routed Direct to Subscriber Class 5 Switch Class 4 Switch Class 4 Switch A B C D ISUP Trunk E F 6
Pre NNP PSTN Class 5 Portable NXX Non-Ported Number Intra Switch Local Call Routed to Subscriber Class 5 Switch LNP Database A B C LNP Query D CdPN E F G 7
Pre NNP PSTN Class 5 to Class 5 Portable NXX Non-Ported Number Intrer Switch Local Call Routed to Subscriber Class 5 Switch LNP Database A B C LNP Query D CdPN E F ISUP Trunk G H 8
Pre NNP PSTN Class 5 to Class 4 to Class 5 Portable NXX Non-Ported Number Inter Switch Local Call Routed to Subscriber Class 5 Switch LNP Class 4 Switch Database A B C LNP Query D CdPN E F ISUP Trunk G H 9
Pre NNP PSTN Class 5 to Class 4 to Class 4 to Class 5 Portable NXX Non-Ported Number Inter Switch Local Call Routed to Subscriber Class 5 Switch LNP Class 4 Switch Class 4 Switch Database A B C LNP Query D CdPN E F ISUP Trunk G H 10
Pre NNP PSTN Class 5 to Class 5 Portable NXX Ported Number Inter Switch Local Call Routed to Subscriber Class 5 Switch LNP Database A B C LNP Query D LRN E F ISUP Trunk G CdPN = LRN, GAP = DN, M-bit = 1 H 11
Pre NNP PSTN Class 5 to Class 4 to Class 5 Portable NXX Ported Number Inter Switch Local Call Routed to Subscriber Class 5 Switch LNP Class 4 Switch Database A B C LNP Query D LRN E F ISUP Trunk G H 12
Pre NNP PSTN Class 5 to Class 4 to Class 4 to Class 5 Portable NXX Ported Number Inter Switch Local Call Routed to Subscriber Class 5 Switch LNP Class 4 Switch Class 4 Switch Database A B C LNP Query D LRN E F ISUP Trunk G H 13
Pre NNP PSTN Class 5 to IXC to Class 5 Portable NXX Non-Ported Number Inter Switch Long Distance Call Routed to Subscriber Class 5 Switch IXC LNP Database A B C D LNP Query E CdPN F ISUP Trunk G H 14
Pre NNP PSTN Class 5 to Class 4 to IXC to Class 5 Portable NXX Non-Ported Number Inter Switch Long Distance Call Routed to Subscriber Class 5 Switch IXC LNP Class 4 Switch Database A B C D LNP Query E CdPN F ISUP Trunk G H 15
Pre NNP PSTN Class 5 to Class 4 to IXC to Class 4 to Class 5 Portable NXX Non-Ported Number Inter Switch Long Distance Call Routed to Subscriber Class 5 Switch IXC LNP Class 4 Switch Class 4 Switch Database A B C D LNP Query E CdPN F ISUP Trunk G H 16
Pre NNP PSTN Class 5 to IXC to Class 5 Portable NXX Ported Number Inter Switch Long Distance Call Routed to Subscriber Class 5 Switch IXC LNP Database A B C D LNP Query E LRN F ISUP Trunk G H 17
Pre NNP PSTN Class 5 to Class 4 to IXC to Class 5 Portable NXX Ported Number Inter Switch Long Distance Call Routed to Subscriber Class 5 Switch IXC LNP Class 4 Switch Database A B C D LNP Query E LRN F ISUP Trunk G H 18
Pre NNP PSTN Class 5 to Class 4 to IXC to Class 4 to Class 5 Portable NXX Ported Number Inter Switch Long Distance Call Routed to Subscriber Class 5 Switch IXC LNP Class 4 Switch Class 4 Switch Database A B C D LNP Query E LRN F ISUP Trunk G H 19
NLRN Option 1 20
NNP NLRN Option 1 Query by IXC A call is originated Based on LRN, Call is routed to Inter Switch trunk toward terminating network Switch Determines Calling Number s presubscribed IXC Slides 31-44 Yes Switch determines if Dialed NPA NXX is portable Is the Dialed Number Local Slides 39-44 Yes Yes Yes Is the Dialed Number Local IXC Queries Database for LRN Call is rejected by Calling Number s IXC No No Call is rejected by Calling Number s IXC Slides 32-38 No Slides 42-44 Slides 25-31 Slides 38-41 Slides 36-38 No Call is routed to the appropriate terminating end office or network for termination to subscriber s Line Call is routed to the appropriate terminating end office or network for termination to subscriber s Line Is the Dialed Number Ported Call is routed to the appropriate terminating end office or network for termination to subscriber s Line Slides 32-35 21
NNP NLRN Option 1 Query by IXC PSTN Class 5 Non-portable NXX Intra Switch Local Call Routed to Subscriber Class 5 Switch A B C D E 22
NNP NLRN Option 1 Query by IXC PSTN Class 5 to Class 5 Non-Portable NXX Inter Switch Local Call Routed to Subscriber Class 5 Switch A B C D ISUP Trunk E F 23
NNP NLRN Option 1 Query by IXC PSTN Class 5 to Class 4 to Class 5 Non-Portable NXX Inter Switch Local Call Routed Direct to Subscriber Class 5 Switch Class 4 Switch A B C D ISUP Trunk E F 24
NNP NLRN Option 1 Query by IXC PSTN Class 5 to Class 4 to Class 5 Non-Portable NXX Inter Switch Local Call Routed Direct to Subscriber Class 5 Switch Class 4 Switch Class 4 Switch A B C D ISUP Trunk E F 25
NNP NLRN Option 1 Query by IXC PSTN Class 5 to Class 4 to IXC to Class 4 to Class 5 Non-Portable NXX Inter Switch Long Distance Call Routed to Subscriber Class 5 Switch IXC A B C D ISUP Trunk E F 26
NNP NLRN Option 1 Query by IXC PSTN Class 5 to Class 4 to IXC to Class 5 Non-Portable NXX Inter Switch Long Distance Call Routed to Subscriber Class 5 Switch IXC Class 4 Switch A B C D ISUP Trunk E F 27
NNP NLRN Option 1 Query by IXC PSTN Class 5 to Class 4 to IXC to Class 4 to Class 5 Non-Portable NXX Inter Switch Long Distance Call Routed to Subscriber Class 5 Switch IXC Class 4 Switch Class 4 Switch A B C D ISUP Trunk E F 28
NNP NLRN Option 1 Query by IXC PSTN Class 5 Portable NXX Non-Ported Number Intra Switch Local Call Routed to Subscriber Class 5 Switch IXC LNP Database A B C LNP Query D CdPN E F G H 29
NNP NLRN Option 1 Query by IXC PSTN Class 5 to Class 5 Portable NXX Non-Ported Number Intrer Switch Local Call Routed to Subscriber Class 5 Switch IXC LNP Database A B C LNP Query D CdPN E F ISUP Trunk G H 30
NNP NLRN Option 1 Query by IXC PSTN Class 5 to Class 4 to Class 5 Portable NXX Non-Ported Number Inter Switch Local Call Routed to Subscriber Class 5 Switch IXC LNP Class 4 Switch Database A B C LNP Query D CdPN E F ISUP Trunk G H 31
NNP NLRN Option 1 Query by IXC PSTN Class 5 to Class 4 to Class 4 to Class 5 Portable NXX Non-Ported Number Inter Switch Local Call Routed to Subscriber Class 5 Switch IXC LNP Class 4 Switch Class 4 Switch Database A B C LNP Query D CdPN E F ISUP Trunk G H 32
NNP NLRN Option 1 Query by IXC PSTN Class 5 to IXC to Class 5 Portable NXX Non-Ported Number Inter Switch Long Distance Call Routed to Subscriber Class 5 Switch IXC LNP Database A B C LNP Query D CdPN E ISUP Trunk F G 33
NNP NLRN Option 1 Query by IXC PSTN Class 5 to Class 4 to IXC to Class 5 Portable NXX Non-Ported Number Inter Switch Long Distance Call Routed to Subscriber . Class 5 Switch IXC LNP Class 4 Switch Database A B C LNP Query D CdPN E ISUP Trunk F G 34
NNP NLRN Option 1 Query by IXC PSTN Class 5 to Class 4 to IXC to Class 4 to Class 5 Portable NXX Non-Ported Number Inter Switch Long Distance Call Routed to Subscriber Class 5 Switch IXC LNP Class 4 Switch Class 4 Switch Database A B C LNP Query D CdPN E ISUP Trunk F G 35
NNP NLRN Option 1 Query by IXC PSTN Class 5 to Class 5 Portable NXX Ported Number Inter Switch Local Call Routed to Subscriber Class 5 Switch IXC LNP Database A B C LNP Query D LRN E F ISUP Trunk G H 36
NNP NLRN Option 1 Query by IXC PSTN Class 5 to Class 4 to Class 5 Portable NXX Ported Number Inter Switch Local Call Routed to Subscriber Class 5 Switch IXC LNP Class 4 Switch Database A B C LNP Query D LRN E F ISUP Trunk G H 37
NNP NLRN Option 1 Query by IXC PSTN Class 5 to Class 4 to Class 4 to Class 5 Portable NXX Ported Number Inter Switch Local Call Routed to Subscriber Class 5 Switch IXC LNP Class 4 Switch Class 4 Switch Database A B C LNP Query D LRN E F ISUP Trunk G H 38
NNP NLRN Option 1 Query by IXC PSTN Class 5 to IXC to Class 5 Portable NXX Ported Number Inter Switch Long Distance Call Routed to Subscriber Class 5 Switch IXC LNP Database A B C LNP Query D LRN E ISUP Trunk F G 39
NNP NLRN Option 1 Query by IXC PSTN Class 5 to Class 4 to IXC to Class 5 Portable NXX Ported Number Inter Switch Long Distance Call Routed to Subscriber Class 5 Switch IXC LNP Class 4 Switch Database A B C LNP Query D LRN E ISUP Trunk F G 40
NNP NLRN Option 1 Query by IXC PSTN Class 5 to Class 4 to IXC to Class 4 to Class 5 Portable NXX Ported Number Inter Switch Long Distance Call Routed to Subscriber Class 5 Switch IXC LNP Class 4 Switch Class 4 Switch Database A B C LNP Query D LRN E ISUP Trunk F G 41
NLRN Option 2 42
NNP NLRN Option 2 Portable = LD A call is originated Switch Determines Calling Number s presubscribed IXC Slides 54-66 Yes Switch determines if Dialed NPA NXX is portable IXC Queries Database for LRN Based on CDPN, Call is routed to Inter Switch trunk toward terminating network Based on LRN, Call is routed to Inter Switch trunk toward terminating network No Slides 54-60 Slides 61-66 Slides 47-53 No Yes Is the Dialed Number Ported Call is routed to the appropriate terminating end office or network for termination to subscriber s Line Call is routed to the appropriate terminating end office or network for termination to subscriber s Line Call is routed to the appropriate terminating end office or network for termination to subscriber s Line 43
NNP NLRN Option 2 Portable = LD2 PSTN Class 5 Non-portable NXX Intra Switch Local Call Routed to Subscriber Class 5 Switch A B C D E 44
NNP NLRN Option 2 Portable = LD Portable = LDPSTN Class 5 to Class 5 Non-Portable NXX Inter Switch Local Call Routed to Subscriber Class 5 Switch A B C D ISUP Trunk E F 45
NNP NLRN Option 2 Portable = LD PSTN Class 5 to Class 4 to Class 5 Non-Portable NXX Inter Switch Local Call Routed Direct to Subscriber Class 5 Switch Class 4 Switch A B C D ISUP Trunk E F 46
NNP NLRN Option 2 Portable = LD PSTN Class 5 to Class 4 to Class 5 Non-Portable NXX Inter Switch Local Call Routed Direct to Subscriber Class 5 Switch Class 4 Switch Class 4 Switch A B C D ISUP Trunk E F 47
NNP NLRN Option 2 Portable = LD PSTN Class 5 to Class 4 to IXC to Class 4 to Class 5 Non-Portable NXX Inter Switch Long Distance Call Routed to Subscriber Class 5 Switch IXC A B C D ISUP Trunk E F 48
NNP NLRN Option 2 Portable = LD PSTN Class 5 to Class 4 to IXC to Class 5 Non-Portable NXX Inter Switch Long Distance Call Routed to Subscriber Class 5 Switch IXC Class 4 Switch A B C D ISUP Trunk E F 49
NNP NLRN Option 2 Portable = LD PSTN Class 5 to Class 4 to IXC to Class 4 to Class 5 Non-Portable NXX Inter Switch Long Distance Call Routed to Subscriber Class 5 Switch IXC Class 4 Switch Class 4 Switch A B C D ISUP Trunk E F 50
