1. DESIGN OF TELECOM
NETWORK
IN SIKKIM
Presented by
Anwesha Sarkar
Anurag Mondal
Ankan Debgupta
Subham Chakraborty

2. AIM OF THE PROJECT
 Design of a Transmission Network for the State of Sikkim.
 Establish a Network for Wireline Services.
 We have to provide the Wireline services to 10,000
subscribers.
 Establish a Network for Broadband Services.
 We have to provide the Broadband services to 5,000
subscribers.

3. OUR IMPLEMENTATION
 The State of Sikkim has 4 Districts (North,South, East,West).
 We have selected the following 9 Sub-division Towns :
 Local Exchanges are placed in each of the Town.
 We have placed the TAX( Tier 1) in Gangtok to support
Wireline Traffic & Tier-1 switch & BNG to support the
Broadband Traffic in Backbone Network .
 We have placed one TAX ( Tier -2) in each of the district .
Therefore 4 TAX (Tier-2) in total to support Backhaul Wireline
Traffic.
• Pakyonk
• Namchi
• Soreng
• Rongli
• Gangtok
• Chungthan
g
• Mangon
• Ravong
• Gyalsing

4. OUR IMPLEMENTATION
(CONT.)
 To support the Backhaul Broadband Traffic , we have place
one Tier-2 Swiches in each District. Total 4 switches are
placed.
 Wireline Traffic & Distribution of connection is estimated
based on the population density.
 Each Broadband Subscriber is provided Bandwidth in the
range of 256 -1024 Kbps.
 OFC is predominantly used in Broadband Backbone &
Backhaul Network.
 We have used both OFC & Microwave (Traffic < 2E1)are
used in designing the Wireline Backhaul & Backbone
Network.
 STM Rings are formed in Backbone Network to provide
protection from OFC cuts.

5. NETWORK NODES FOR WIRELINE & BROADBAND NETWORK
Tier 2 Switch
Tier 1 Switch
BNG
TAX(Level 2)
TAX(Level 1)
Local Exchange

6. WIRELINE NETWORK

7. ARCHITECTURE OF WIRELINE
NETWORK
W
N
S
E
ADM
-1
E1
E1
E1
E1
ADM
-1
ADM
-1
ADM
-1
ADM
-1
STM-1
Ring
2E
1
2E1
3E1
6E1
3E1
10
E1
10 E1
53
E1
33 E1
STM
-1Manga
n
(250)
Chungthu
ng
(250)
Ravong
(750)
Namac
hi
(750) Rongli
(1500)
Pakyon
g
(1500)
Gangto
k
(4000)
Soreng
(500)
Gyalsin
g
(500)
Gangto
k
To
Siliguri
TAX(Level 2)
TAX(Level 1)
Local
Exchange
ADM
Microwave
OFC

8. TRANSMISSION LINK DETAILS
: WIRELINE
SL.NO
Access Network Backhaul Network Backbone Network
Local Exchange Node Link Node Link
1 Gangtok TAX-2(East) OFC TAX-1 via TAX-2(East) OFC
2 Mangan TAX-2(North) Microwave TAX-1 via TAX-2(North) OFC
3 Chungthang TAX-2(North) Microwave TAX-1 via TAX-2(North) OFC
4 Ravong TAX-2(South) OFC TAX-1 via TAX-2(South) OFC
5 Gyashing TAX-2(West) Microwave TAX-1 via TAX-2(West) OFC
6 Pakyong TAX-2(East) OFC TAX-1 via TAX-2(East) OFC
7 Namchi TAX-2(South) OFC TAX-1 via TAX-2(South) OFC
8 Soreng TAX-2(West) Microwave TAX-1 via TAX-2(West) OFC
9 Rongli TAX-2(East) OFC TAX-1 via TAX-2(East) OFC

9. TRAFFIC DETAILS : WIRELINE
SL.NO Local Exchange No.of Subscriber BHCA
Holding Time
(in sec) Traffic (E1)
1 Gangtok 4000 4 180 33
2 Mangan 250 1 60 1
3 Chungthang 250 1 60 1
4 Ravong 750 2 120 3
5 Gyashing 500 1 90 1
6 Pakyong 1500 3 180 10
7 Namchi 750 2 120 3
8 Soreng 500 1 90 1
9 Rongli 1500 3 180 10
Total 10000 63

10. BROADBAND NETWORK

11. ARCHITECTURE OF
BROADBAND NETWORK
W
N
S
E
ADM
-64
16
E1
16
E1
ADM
-64
ADM
-64
ADM
-64
ADM
-64
STM-64
Ring
32
E1
2 STM-
1
22 STM-
1
4GE
Manga
n
(125)
Chungthu
ng
(125)
Ravong
(375)
Namac
hi
(375) Rongli
(750)
Pakyon
g
(750)
Gangto
k
(2000)
Soreng
(250)
Gyalsin
g
(250)
Gangto
k
To
Siliguri
2 STM-
1
4 STM-
1
STM-1
STM-1 2 STM-
1
1 STM-
16
3 STM-
1
3 STM-
1
BNG
T2 Switch
T1 Switch
Local
Exchange
ADM
BNG
OFC

12. TRANSMISSION LINK DETAILS :
BROADBAND
SL.NO
Access Network Backhaul Network Backbone Network
Local Exchange Node Link Node Link
1 Gangtok T2(East) OFC T1 via T2(East) OFC
2 Mangan T2(North) OFC T1 via T2(North) OFC
3 Chungthang T2(North) OFC T1 via T2(North) OFC
4 Ravong T2(South) OFC T1 via T2(South) OFC
5 Gyashing T2(West) OFC T1 via T2(West) OFC
6 Pakyong T2(East) OFC T1 via T2(East) OFC
7 Namchi T2(South) OFC T1 via T2(South) OFC
8 Soreng T2(West) OFC T1 via T2(West) OFC
9 Rongli T2(East) OFC T1 via T2(East) OFC

13. TRAFFIC DETAILS :
BROADBAND
SL.NO Local Exchange No.of Subscriber Bandwidth(kbps) Traffic
1 Gangtok 2000 1024 STM-16
2 Mangan 125 256 16 E1
3 Chungthang 125 256 16 E1
4 Ravong 375 512 2 STM-1
5 Gyashing 250 512 1 STM-1
6 Pakyong 750 512 3 STM-1
7 Namchi 375 512 2 STM-1
8 Soreng 250 512 1 STM-1
9 Rongli 750 512 3 STM-1
Total 5000 4GE

14. CONCLUSION
 A Wireline Network & Broadband is established in the state of
Sikkim.
 In Total 9 local exchanges, 4 TAX(level 2), 4 T2 switches ,
one TAX(level 1), one T1 switch and one BNG are used in the
implementation of the complete network.
 STM-1 & STM-64 rings are formed in the Backbone of
Wireline & Broadband Network respectively to provide
protection from OFC cuts.
 Network was predominantly constructed over OFC in order to
support higher data rates.

15. THANK YOU