INTRODUCTION TO PBX

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INTRODUCTION TO PBX
PRIVATE BRANCH EXCHANGE
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TELEPHONE NETWORK (PSTN)
subscriber
METROPOLITAN Area
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PBX LOCATION
subscriber
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500-1111
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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
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500-1111
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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
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Individual line interface
500-1111
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Multi hunting group line interface
500-1111
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Incoming call from PSTN without DID
1. Call via operator
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Incoming call with DID
500-1111
Call from PSTN direct to Extension
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TIE line interface
PBX
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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
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CO line interface
500-1111
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CO line Interface Signaling
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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
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Local exchange
REVERSE POLARITY
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
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Local exchange
REVERSE PULSE
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Local exchange
GROUND start
PBX
-
48 v
DC loop

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

Speech circuit
A sub.
B sub.
Line circuit
CO line interface
Subscriber line interface
Osc 16KHz
Used 16 KHz signal send from LE to PBX for
charging system
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TO type for hunting method 1.Sequence hunting 2.
Random hunting
Multi hunting group
PBX
EXTENSION
Pilot number 500-1000
111
PSTN
500-1000
222
500-1111
500-1001
ELxxxxxx
333
Member with DN
Member without DN
Member with slip/without slip for incoming call
from LE
ATTENDENT CONSOLE
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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
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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
222
500-1111
500-1003
answer
333
Call pickup group
ATTENDENT CONSOLE
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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
222
500-1111
500-1003
333
3 type for forwarding 1.forward no
condition 2.forward for busy 3.forward no answer
ATTENDENT CONSOLE
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Service feature conference call
PBX
EXTENSION
Conference circuit
500-1000
111
PSTN
500-1001
222
500-1111
500-1003
333
2 type for conference 1. 1 Extension 2 PSTN
SUB. 2. 1 PSTN sub. 2 Extension
Conference circuit
ATTENDENT CONSOLE
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operator
DIGITAL
PSTN
SLC-D
TRUNK
Digital telephone
ANALOG
SLC-D
TRUNK
Analog telephone
SLC-A
TIE.T
Tie line
Voice memory
OM
VMI
I/O
I/O
Music
I/O
Hotel-system
PBX architecture
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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
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DID PBX
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)
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Call flow from GSP to DID (MFC R2)
456
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Call floe from DID to GSP (DTMF)
456
DTMF
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Trunking Access
Data base
Digit analysis 6000000 Routing Trunk group