1. Summit Communications Ltd
Training Session 1

2. Introduction What is NTTN?
Nationwide Telecommunication & Transmission network
As per BTRC’s guideline, an operator with an NTTN license has the authority to lay fiber, both overhead & underground, throughout the whole country. In short, build their own infrastructure & accommodate other operators in their network.
The license has been awarded to SCL on 9th December 2010
Validity-15 years
Renewal every year

3. Clients ISP Wimax Telco Link3, Aamra, Optimax, ConnectBD, etc
Banglalion, Qubee, Ollo
Telco
Airtel, GP, Robi, Teletalk

4. Objective
To implement and operate telecommunication network throughout the whole country.
To serve the industry with durable, reliable and affordable network solution in the long run.
To innovate and serve the industry with up to date transmission technology which will serve current & future demand of the market.

5. Optical Fibers Constructed from glass
Usually 5 to 20 micrometers in diameter
Used to carry signals in the form of light over distances up to 50 km.

6. Construction of Optical Fibers
Core – Thin glass center of the fiber where light travels.
Cladding – Outer optical material surrounding the core
Buffer Coating – Plastic coating that protects
the fiber.

7. Type of Fibers Optical fibers come in two types:
Single-mode fibers – used to transmit one signal per fiber (used in telecommunication). They have small cores(9 microns in diameter) and transmit infra-red light from laser.
Multi-mode fibers – used to transmit many signals per fiber (used in computer networks). They have larger cores(20 microns in diameter) and transmit infra-red light from LED.

8. How Does Optical Fiber Transmit Light ?
Total Internal Reflection.
Fiber Optics Relay Systems has
-Transmitter
-Optical Fiber
-Optical Regenerator
-Optical Receiver

9. Total Internal Reflection

10. Advantages: Thinner Less Expensive Higher Carrying Capacity
Less Signal Degradation& Digital Signals
Light Signals
Non-Flammable
Light Weight

11. Disadvantages: Scattering: i) Linear, ii) Non-Linear
Absorption: i) Intrinsic, ii) Extrinsic
Bending: i) Macro, ii) Micro
Dispersion: i) Modal, ii) Chromatic

12. Optical fiber cable (OFC)
SCL is currently using 4 types of cables:
6 core
12 core
144 core
432 core

13. Types of OFC (Contd..)
Optical fiber cables follow the below color coding:
Blue, Orange, Green, Brown, Slate, White, Red, Black, Yellow, Violet, Pink, Aqua
Six core cables have the first six colors
12 core cables have all the colors
144 core cables have 12 tubes & the mentioned 12 cores in each tube (12 X 12 = 144)

14. Types of OFC (Contd..) 432 core cable
Color coding for this type of cable is slightly different.
There are:
9 slots
8 ribbons per slot
6 cores per ribbon
9 X 8 X 6 = 432

15. CORES Cores: Summit Uses Single Mode Fiber
i) 144 Core SM Cable iii) 432 Ribbon Cable

16. Services
The main service of Summit Communications Limited is to facilitate network transmission service.
SCL provide network service through -
Dark Fiber Leasing
Bandwidth Leasing
BTS connectivity

17. CONNECTORS
Connectors: SCL Basically Uses 3 types of Connectors FC SC LC

18. DEVICES AND ELEMENTS

19. Splicing Methods Fusion Splicing
Fusion splicing is the recommended method of fusing two fibers together.
In a fusion-splice, the two fibers are "welded" together with an electric arc.
Mechanical Splicing
A typical mechanical splice uses a gripping mechanism to prevent fiber separation, a means for fiber alignment, and includes index matching gel to reduce signal loss.
SCL uses Fusion Splicing

20. Passive Elements
Enclosure
Splicer
Ribbon Splicer

21. Optical Distribution Frame
Passive Elements
Optical Distribution Frame
Optical Power Meter

22. Passive Elements
OTDR

23. Under Ground (UG) HDD or Open Cut work is done for cable blowing (UG)
Optical fiber is then blown in the Duct using an air compressor which can propel it up to 2 kilometers away.
Core is allocated to POC to POC
Core is Spliced in to the POP of the clients
UG Building solution is done for last mile connectivity
Refer to kmz file

24. Civil Work
Horizontal Direction Driven (HDD) is done for Duct and Optical fiber blowing
Hand Hole (HH) is make for cable reservation
Point of Connection (POC) is make for GCO installation (UG Connectivity)

25. SCL NETWORK Under Ground Network 1. Dhaka City 2. Savar
Over Head Network
2. Sylhet
3. Chittagong
4. Narayangong
Show .kmz file

26. Business expansions International Terrestrial Cable. (ITC)
International Internet Gateway. (IIG)
Interconnecting exchange. (ICX)

27. THANK YOU