Summit Communications Ltd Training Session 1

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

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

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.

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.

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.

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.

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

Total Internal Reflection

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

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

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

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)

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

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

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

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

DEVICES AND ELEMENTS

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

Passive Elements Enclosure Splicer Ribbon Splicer

Optical Distribution Frame Passive Elements Optical Distribution Frame Optical Power Meter

Passive Elements OTDR

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

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)

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

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

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