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INTRODUCTION TO PBX

INTRODUCTION TO PBX. PRIVATE BRANCH EXCHANGE. To international. Provincial Area. SC. ITSC. International telephone switching center. PC. LE. SC. SC. Secondary center. Tandem. GSP. TA Network. Tandem exchange. TE. TE. RCU. Subscriber. subscriber. LE. Local exchange. LE. LE.

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INTRODUCTION TO PBX

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  1. INTRODUCTION TO PBX PRIVATE BRANCH EXCHANGE

  2. To international Provincial Area SC ITSC International telephone switching center PC LE SC SC Secondary center Tandem GSP TA Network Tandem exchange TE TE RCU Subscriber subscriber LE Local exchange LE LE LE Remote subscriber TELEPHONE NETWORK (PSTN) subscriber METROPOLITAN Area

  3. subscriber Subscriber line Local exchange Subscriber line Extension PBX LE TE Remote switch Digital trunk(PCM) Digital trunk (PCM) Subscriber line Subscriber line LE PBX Extension PBX LOCATION subscriber

  4. PBX EXTENSION CO LINE 111 PSTN 500-1000 500-1001 222 500-1003 333 TIE LINE to PBX ATTENDENT CONSOLE 500-1111

  5. Traffic cases 1. Internal Call 2. Operator Call 3. Outgoing Call 4. Incoming Call 5. Transit Call Extension to Extension Extension to Operator Extension to PSTN PSTN to Extension via operator PBX TO PBX PBX TYPE 1. PMBX Private Manual Branch Exchange 2. PABX Private Automatic Branch Exchange

  6. PBX EXTENSION CO LINE 111 PSTN 500-1000 500-1001 500-1111 222 500-1003 333 TIE LINE to PBX ATTENDENT CONSOLE

  7. PBX EXTENSION 660-2222 Dial Access code 9 or 0 CO LINE 111 PSTN 500-1000 500-1001 222 500-1003 333 TIE LINE to PBX ATTENDENT CONSOLE 500-1111

  8. PBX INTERFACE TOPSTN EXTENSION 111 PSTN 500-1111 222 TIE line 333 Extension ATTENDENT CONSOLE PBX

  9. TYPE OF INTERFACE TO PSTN 1. CO line (analog subscriber line) - Individual line - Multi - Hunting Group 2. PCM DID 3. BAI - ISDN 4. Primary - ISDN 5. TIE line analog Interface between PBXs

  10. PBX EXTENSION CO LINE 111 PSTN 500-1000 500-1001 222 500-1003 333 TIE LINE to PBX ATTENDENT CONSOLE Individual line interface 500-1111

  11. PBX EXTENSION Pilot number 500-1000 111 PSTN 500-1000 500-1001 222 500-1003 333 Member 500-1001,501-1003 TIE LINE to PBX ATTENDENT CONSOLE Multi hunting group line interface 500-1111

  12. PBX EXTENSION 500-1111 CO LINE PSTN 111 500-1000 500-1001 222 500-1003 333 2. Call via DISA(Direct in to station access) with IVR (interactive voice response) IVR ATTENDENT CONSOLE Incoming call from PSTN without DID 1. Call via operator

  13. PBX EXTENSION Digital trunk interface PSTN 111 222 DTMF and MFCR2 signaling 333 Interface with digital trunk (PCM E1) Not used Operator Incoming call with DID 500-1111 Call from PSTN direct to Extension

  14. PBX EXTENSION 666 111 222 555 TIE line trunk 333 Connected between PBXs used Proprietary interface protocol used 4 wire E&M trunk or 2 wire trunk Interface TIE line interface PBX

  15. CO line Interface Signaling Muti-hunting Function - Sequential type - random type Multi-hunting member - pilot number - member with DN - member without DN - Member with slip function - Member without slip function 1.line Signaling - dc loop - reverse polarity - reverse pulse - ground start - 16 khz 2. Addressing signal - DP - DTMF

  16. CO line interface PBX EXTENSION CO line interface DTMF P S T N 111 222 DP 333 Subscriber line interface CO line interface Line interface circuit Line signaling 1.DC loop 4.ground start 2.Reverse polarity 5.16 kHz 3.Reverse Pulse Register signaling 1.Dial pulse(DP) 2.Dual tone Multi-frequency(DTMF) 500-1111

  17. 1. Addressing signaling (register signaling) 1. 1 Dial pulse (DP) 1.2 Dual tone multi frequency(DTMF) 1209hz 1366hz 1477hz 697 hz 1 2 3 770hz 4 5 6 852hz 7 8 9 941hz * 0 # CO line Interface Signaling

  18. - 48 v DC loop + Speech circuit CO line interface Line circuit CO line Interface Signaling 2. line Signaling 2.1 dc loop 2.2 reverse polarity 2.3 reverse pulse 2.4 ground start 2.5 16 kHz Local exchange PBX Subscriber line interface CO line interface function - detect ringing signal from LE - Send on hook/off hook signal to line circuit - detect line signaling from LE for start charging system - conversation channel

  19. REVERSE POLARITY Local exchange PBX RELAY - 48 v DC loop + Speech circuit control CO line interface A sub. Line circuit B sub. After subscriber B answer control function in line circuit control relay for reverse dc polarity

  20. PBX - 48 v DC loop + Speech circuit control CO line interface A sub. Line circuit Line circuit PULSE B sub. After subscriber B answer control function in line circuit send pulse to CO line interface for charging system REVERSE PULSE Local exchange

  21. Local exchange GROUND start PBX - 48 v DC loop + SLV G Speech circuit A sub. B sub. CO line interface Line circuit Subscriber line interface Ground signal Sleeve Relay Used ground signal for send charging signal to PBX

  22. 16 KHz Local exchange PBX - 48 v DC loop + Speech circuit A sub. B sub. CO line interface Line circuit Subscriber line interface Osc 16KHz Used 16 KHz signal send from LE to PBX for charging system

  23. TO type for hunting method 1.Sequence hunting 2. Random hunting Multi hunting group PBX EXTENSION Pilot number 500-1000 111 PSTN 500-1000 500-1001 500-1111 222 EL=xxxxxx 333 Member with DN Member without DN Member with slip/without slip for incoming call from LE ATTENDENT CONSOLE

  24. PABX Service Feature 1. MUSIC ON HOLD 2. DISA direct into station access and OGM (outgoing message unit) 3.outward dialing 4.Class of service (outgoing call to CO line) 5.speed dial 6.pick up group 7. CO line automatic disconnect 8. HOT LINE with delay/without delay 9.call forwarding 10.call fording without answer 11.call forwarding with busy 12 call waiting 13.conference between Co line and extension 14 REDIAL

  25. Service feature call pick up group Call from PSTN to extension number 111 but extension 222 or 333 can be answer PBX EXTENSION ringing 500-1000 111 PSTN 500-1001 answer 500-1111 222 500-1003 answer 333 Call pickup group ATTENDENT CONSOLE

  26. Service feature call forwarding Call from PSTN to extension number 111 but system forward call to extension number 222 PBX EXTENSION 500-1000 111 PSTN ringing 500-1001 500-1111 222 500-1003 333 3 type for forwarding 1.forward no condition 2.forward for busy 3.forward no answer ATTENDENT CONSOLE

  27. Service feature conference call PBX EXTENSION Conference circuit 500-1000 111 PSTN 500-1001 500-1111 222 500-1003 333 2 type for conference 1. 1 Extension 2 PSTN SUB. 2. 1 PSTN sub. 2 Extension Conference circuit ATTENDENT CONSOLE

  28. operator DIGITAL PSTN SLC-D TRUNK Digital telephone ANALOG SLC-D TRUNK Analog telephone SLC-A TIE.T Tie line Voice memory O&M VMI I/O I/O Music I/O Hotel-system PBX architecture

  29. SLC-D : Digital Subscriber line circuit SLC-A : Analog Subscriber line circuit VMI : Voice memory interface I/O : Input Output device interface TRUNK: digital/analog trunk interface to PSTN TIE.T : TIE line Trunk interface to PBX

  30. DID PBX DTI 6020020 DTI DTI (PCM30) 123 E1 456 6020030 E1 DID PBX Exchange code 8051 Exchange code 602 Signaling - DTMF,MFC R2 - Primary (DSS1) GSP 300 Interface between GSP and PBX - DTI (PCM30) digital trunk interface - Two type of signaling - analog (MFC R2 and DTMF) - Digital primary rate access (DSS1) Call set up - Call direct from public network to PBX extension (EX. Dial 8051123) - call from PBX to public dial access code (EX. 9 or 0)

  31. GSP DID PBX DTI 6020020 DTI DTI (PCM30) 123 E1 MFC R2 6020030 E1 Exchange code 602 Exchange code 8051 Dial 02 8051 123 Sizure Sz.ACK Digit “0” A1 MFC R2 Digit “3” A3 Cat. 2(ord.) ringing B1(Free with charge) Ring tone Answer Answer Conversation Call flow from GSP to DID (MFC R2) 456

  32. DTI 6020020 DTI DTI (PCM30) 123 E1 MFC R2 6020030 E1 Call floe from DID to GSP (DTMF) Exchange code 602 Exchange code 8051 Dial access code(9or0) Sizure Sz.ACK Dial tone Dial digit (DTMF) “0” DTMF (digit 0) Dial digit (DTMF) “0” DTMF (digit 0) ringing Ring tone Answer Answer Conversation 456 DTMF

  33. GSP ISP (Remote access server) Trunk group DTI DTI E1 PCM30 E1 PCM30 Signaling interface - MFC R2 Signaling - CCS No7 Signaling Access number 6000000 Trunking Access Data base Digit analysis 6000000 Routing Trunk group

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