Introduction to Telecommunication Network... Comparison between Copper – Fiber – Radio Copper...
Transcript of Introduction to Telecommunication Network... Comparison between Copper – Fiber – Radio Copper...
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Fathur AB
Anin A
Afif A
Hari A
Gary A
Dhika AB
April AB
Mulya AB
Rizka B
Dion AB
Siska AB
Mirel AB
Hani AB
Airita AB
Yusuf AB
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PSTN Extended Transmission Media
Course Number : TTH2A3
CLO : 1
Week : 2 extended
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Three main networks in PSTN
Local Network Local Network
Core Network
1. Backbone / Core network
2. Access Network / Local Loop
3. Interconnection Network
Access Network
Other Licensed Operator
Interconnection Network
Backbone Network
Local Exchange
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Topology
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Comparison between Copper – Fiber – Radio
Copper Fiber Optic Radio
Speed Fastest Slowest
Cost Highest Lowest
Distance Nearest Farthest
MTTF* Shortest Longest
MTTR** Shortest Longest
MTTI*** Longest Shortest
Quality (S/N)**** Best Worst
*MTTF = Mean Time To Failure (Longest = good) **MTTR = Mean Time To Recovery (Shortest = good) ***MTTI = Mean Time To Install (Shortest = good) ****S/N = Signal to Noise Ratio
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Copper Wire
1. Always in pair, one for transmitting (Tx) and one for receiving (Rx)
2. Designed for transmitting analog voice (0 – 4 KHz)
3. Performance measured for attenuation (R) and phase shifting ()
Tx Tx
Rx Rx
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Coaxial Wire
• Up to 2Gbps and 1km
• Wider bandwidth high frequency signal
• Example: antenna cable for television
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Fiber Optic Wire
• Made from silica glass or plastic
• Low attenuation best for long distance connection
• Widest bandwidth best for multimedia services
• Transmitter may use Light Emitting Diodes (LED) or Injection Laser Diodes (ILD)
• Receiver my use PIN or Avalanche Photodiode
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Radio
• Factors to be considered: distance, weather, landscape/contour and channel capacity
• Type: Terrestrial and Satellite: – LEO (Low Earth Orbit)
– MEO (Medium Earth Orbit)
– GEO (Geostationary Orbit)
Tx Rx
2h
1h
1d 2d
d
hc
hs
q
STASIUN BUMI TX STASIUN BUMI RX
SATELIT
UPLINK DOWN LINK
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PSTN Extended Local Exchange
Course Number : TTH2A3
CLO : 1
Week : 2 extended
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Inside Local Exchange
• Exchange Control System manages call establishment
• Switch Block connects subscribers
• Ringing Peripheral provides special information for signalling
SLTU MUX
MF
SIG
TONE
SUBS.
LINE
CONTR
OLLER
SUBS
CONS
SWITCH
BLOCK
(SCSB)
GROUP
SWITCH
BLOCK
MF
SIG
CAS
CCS
OPERRATIONS
COMMONDS
TERMINAL
Telephone
analog
trunk
Digital
trunk
Group Switch UnitSubscriber Concentration Unit
ANALOG LINE
DIGITAL LINE
CONTROL
PATH
EXCHANGE CONTROL SYSTEM
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Mesh Topology
• All nodes connected to one another
• When S = number of nodes and N = number of connections, then:
• Benefits: – All nodes have the same priority
– Simpler switching mechanism
– Better fault tolerance
• Losses: – Inefficient (low utilization)
– Hard for interconnection
A
E
B
D
C
2
1SSN
sconnection102
20
2
4.5
2
155
2
1
5
SS
N
Nodes
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Star Topology
A B
D C
T
Transit
Exchange
• All nodes connected to one main or tandem node
• When S = number of nodes and N = number of connections, then
N = S - 1
• Benefits: – Applicable for lower traffic
– High efficiency
• Losses: – Fault in T means all connections will fault
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Mesh + Star Topology
• Benefits: – More efficient
– Low volume traffic going through T, while high volume traffic use direct connection
– Possibility to use alternate route
• Losses: – More complex mechanism
A
T T
T T
B C
D
E
FG
H
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Ring Topology
A B
C
DE
• All nodes connected max to 2 other nodes
• When S = number of nodes and N = number of connections, then
N = S
• When A sends information to C, B acts as a repeater
• Benefits:
– Easy to install and configure
– Easy to locate fault
• Losses:
– One node fail means all network fail as a solution use double ring topology
– Only one traffic allowed at one time
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Bus Topology
• One bus transmits everything (broadcast)
• Benefits:
– Easy to install
– Shorter wiring cable
• Losses:
– Inflexible (additional node create all changes)
– Fault intolerance (fault in bus makes network down)
A
B
C
D
E
F
G
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Tree Topology
• Derived from star topology
• Tandem node acts as repeater uplink and downlink
• Central node acts as an active node, while other nodes act as passive nodes
• Benefits and losses follow the star topology
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Hierarchy Topology
• Designed for a very wide area network
• Takes longer time to establish call
• Inefficient network utilization, needs routing mechanism
IX
T C
L E
S C
P C
T C
L E
S C
P C
Tertiary Centre
Secondary Centre
Primary Centre
Local Exchange
International (Gateway)
Exchange
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Next Evolution
• ISDN (Integrated Services Digital Network)
• IN (Intelligent Network)
• PLMN (Public Land Mobile Network)
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See you on next class