INTRODUCTION TO PBX PRIVATE BRANCH EXCHANGE TELEPHONE NETWORK

INTRODUCTION TO PBX PRIVATE BRANCH EXCHANGE

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

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

EXTENSION PBX CO LINE 111 500 -1000 PSTN 500 -1001 222 500 -1003 333 TIE LINE to PBX ATTENDENT CONSOLE 500 -11

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

EXTENSION PBX CO LINE 111 500 -1000 PSTN 500 -1001 222 500 -1003 333 TIE LINE to PBX ATTENDENT CONSOLE 500 -11

EXTENSION PBX Dial Access code 9 or 0 660 -2222 CO LINE 111 500 -1000 PSTN 500 -1001 222 500 -1003 333 TIE LINE to PBX ATTENDENT CONSOLE 500 -11

EXTENSION PBX INTERFACE TOPSTN 111 PSTN 222 500 -11 TIE line 333 ATTENDENT CONSOLE PBX Extension

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

Individual line interface EXTENSION PBX CO LINE 111 500 -1000 PSTN 500 -1001 222 500 -1003 333 TIE LINE to PBX ATTENDENT CONSOLE 500 -11

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

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

Incoming call with DID EXTENSION PBX Digital trunk interface 111 222 333 PSTN DTMF and MFCR 2 signaling Interface with digital trunk (PCM E 1( Not used Operator Call from PSTN direct to Extension 500 -11

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

CO line Interface Signaling. 1 line Signaling - dc loop - reverse polarity - reverse pulse - ground start 16 - khz. 2 Addressing signal - DP - DTMF 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

CO line interface PBX EXTENSION CO line interface DTMF P S T N 111 222 DP 333 Subscriber line interface CO line interface Register signaling. 1 Dial pulse(DP(. 2 Dual tone Multi-frequency(DTMF( 500 -11 Line interface circuit Line signaling. 1 DC loop 4. ground start. 2 Reverse polarity 5. 16 k. Hz. 3 Reverse Pulse

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

CO line Interface Signaling . 2 line Signaling 2. 1 dc loop 2. 2 reverse polarity 2. 3 reverse pulse 2. 4 ground start 16 2. 5 k. Hz Local exchange PBX DC loop 48 v + Speech circuit CO line interface Line circuit 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

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

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

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

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

Multi hunting group EXTENSION 111 222 333 PBX TO type for hunting method. 1 Sequence hunting . 2 Random hunting Pilot number 500 -1000 500 -1001 PSTN EL=xxxxxx 500 -11 Member with DN Member without DN Member with slip/without slip ATTENDENT CONSOLE for incoming call from LE

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

EXTENSION ringing Service feature call pick up group Call from PSTN to extension number 111 bu PBX extension 222 or 333 can be answer 500 -1000 111 500 -1001 PSTN 500 -1003 answer 222 answer 333 Call pickup group ATTENDENT CONSOLE 500 -11

EXTENSION 500 -1000 111 ringing 222 333 Service feature call forwarding Call from PSTN to extension number 111 bu PBX system forward call to extension number 222 500 -1001 PSTN 500 -1003 3 type forwarding. 1 forward no condition. 2 forward for busy ATTENDENT CONSOLE. 3 forward no answer 500 -11

Service feature conference call EXTENSION PBX Conference circuit 500 -1000 111 500 -1001 PSTN 500 -1003 222 333 Conference circuit ATTENDENT CONSOLE 500 -11 2 type for conference 1. 1 Extension 2 PSTN SUB. 1. 2 PSTN sub. 2 Extension

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

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

DID PBX GSP 6020020 DTI (PCM 30( 6020030 Exchange code 602 E 1 Signaling -DTMF, MFC R 2 -Primary (DSS 1( Interface between GSP and PBX DTI (PCM 30) digital trunk interface Two type of signaling analog (MFC R 2 and DTMF( Digital primary rate access (DSS 1( DTI DID PBX 123 456 300 Exchange code 8051 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 (

GSP 6020020 6020030 Call flow from GSP to DID (MFC R 2( DID PBX DTI (PCM 30( DTI E 1 MFC R 2 Exchange code 602 Exchange code 8051 Dial 02 8051 123 Sizure Sz. ACK Digit “ 0” A 1 Digit “ 3” Ring tone A 3 Cat. 2(ord(. B 1(Free with charge( Answer Conversation MFC R 2 ringing Answer 123 456

Call floe from DID to GSP (DTMF( 6020020 DTI 6020030 DTI (PCM 30( MFC R 2 Exchange code 602 E 1 DTI 123 456 Exchange code 8051 Dial access code(9 or 0( Sizure Sz. ACK DTMF ringing Answer DTMF (digit 0( Ring tone Answer Conversation Dial tone Dial digit (DTMF) “ 0”

Trunking Access GSP DTI Data base Trunk group ISP (Remote access server( DTI E 1 PCM 30 Signaling interface Access number 6000000 Digit analysis 6000000 - MFC R 2 Signaling Routing - CCS No 7 Signaling Trunk group