Project Optica Fiber

8/3/2019 Project Optica Fiber

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ABOUT C-DOT

The Centre for Development of Telematics (C-DOT)is the Telecom

Technology development centre of the Government of India. It was

established in August 1984 as an autonomous body. It was vested with full

authority and total fleibility to develop state!of!the!art telecommunication

technology to meet the needs of the Indian telecommunication networ". The

"ey ob#ective was to build a centre for ecellence in the area of telecom

technology.

$hile the initial mandate of %!&'T in 1984 was to design and develop

digital echanges and facilitate their large scale manufacture by the Indian

Industry( the development of transmission e)uipment was also added to its

scope of wor" in 1989.

C-DOTs current product portfolio spans world!class &igital *witching

*ystems( Intelligent +etwor" *olutions( Access +etwor" products( ,oice over

I- solutions( *& / $&0 technologies( *atellite %ommunication *ystems(+etwor" 0anagement *ystems and 'peration *upport *ystems.

&igital *witching systems( Intelligent +etwor" systems and ural Telecom

products from %!&'T dominate the large Indian Telecom +etwor". This

distinction emerges from the cost!effectiveness and ruggedness of %!&'T

products as well as a comprehensive technology transfer and field support

methodology that focuses on long!term relationship with the technology

recipients( networ" operators and service providers.

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FOCUS AREAS -

%ommercial support for legacy system.

Advanced Intelligent +etwor" *ervices.

'perational *upport *ystems.

+etwor" 0anagement *ystems.

2ied and 0obile ural $ireless *ystems.

+et Generation +etwor" *ystems for Intercity Trun" 3changes.

*trategic *ector &evelopment -ro#ects.

OB!ECT"#ES-

-rovide solutions for current and future re)uirements of

telecommunication and converged networ"s including those re)uired for

rural applications.

-rovide mar"et orientation to /& activities and sustain %!&'T as a

centre of ecellence.

uild partnerships and #oint alliances with industry( solution providers(

Telcos and other development organisations to offer cost effective

solutions.

*upport Telcos and service providers in the introduction of new

technologies( features and services by optimal utili5ation of installed

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networ"s.

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$RODUCTS OF C-DOT

%& %!&'T %I%IT *$IT%!

ural automatic echange

0ain automatic echange

T'E C-DOT DSS A FA"*+

Total *olutions for $ide Area Telecommunication

The %!&'T &igital *witching *ystem 0ain Automatic 3change :&**

0A;< is a family of The %!&'T digital switching systems that offers total

switching solution for national telecom networ"s. The %!&'T &** 0A;

products have the proven ability to serve as local( toll( transit and Integrated

=ocal!cum!Transit :I=T< switches. The in!built support for **> enables the

%!&'T0A; to function as integrated *ignal Transfer -oint :*T-< andintegrated *ervice *witching -oint :**-


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%!&'T A; is a digital stored program control switching system with upto

6? terminations or ports. It employs a non!bloc"ing 4!wire -%0 switching

networ". %!&'T A; is a digital stored program control switching system

with upto 6? terminations or ports. It employs a non!bloc"ing 4!wire -%0

switchingnetwor".

It is ideal for rural applications since it provides immediate basic telephoneconnections with practically no infrastructure. It is easy to install and

possesses a fault!tolerant system with inbuilt redundancy. esides re)uiring

no air!conditioning( it withstands dust( wide temperature fluctuations :!? to

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%!&'T offers complete and cost!effective Intelligent +etwor" :I+< solution

comprising *ervice %ontrol -oint :*%-


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CO$ACT ST-"

The world is fast becoming a global village. This has led to an eplosion in

the demand for sophisticated telecom service. Today services such as

videoconferencing remote database access and multimedia file transfer

re)uire a high capacity networ" with the availability on demand of virtuallyunlimited bandwidth. The current networ"( based on high plesiochronous

transmission systems is not ideally suited to the efficient delivery and

management of high bandwidth connections. It had evolved mainly

tosupport plain voice telephony. *ynchronous &igital ierarchy :*&4 bytes for *T*!1( or 674@ bytes for *T0!1B*T*!

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If you have thin trac"s :W6? thou< then itVs nice to add a Schamfer to

any ST!#unction( thus eliminating any 9@ degree angles.

0inimi5es the number of hole si5es.

&ouble chec" for correct hole si5es on all your components

3nsure that all your vias are identical( with the same pad and hole

si5es.

%hec" that there is ade)uate physical distance between all your

components.

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%ircuit connectivity. It chec"s that every trac" on your board matches

the connectivity of your schematic.

3lectrical clearance. Uou can chec" the clearance between trac"s(

pads( and components.

0anufacturing tolerances li"e minBma hole si5es( trac" widths( via

widths( annulus si5es( and short circuits.

%>&0oo. 0ro,n.in4

Grounding is fundamental to the operation of many circuits. There are

several grounding techni)ues which are always good practices to

incorporate into any design.

The more copper you have in your ground path( the lower the

impedance Always dedicate one of your planes to ground on multi!layer boards.

0a"e it the layer closest to the top layer.

un separate ground paths for critical parts of your circuit( bac" to the

main filter capacitor

If using a ground plane( utili5e Ssplit plane techni)ues to give

effective star grounding.

S*titch re)uired points straight through to your ground plane( donVt

use any more trac" length than you need. se multiple vias to decrease your trace impedance to ground.

.

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and soldering is the traditional method typically used for prototypes

and small production runs

$ave soldering is a common process used for surface mount and

through hole production soldering. It involves passing the entire board

over a molten bath of solder.

eflow soldering is the latest techni)ue and is suitable for all surface

mount components. The blan" board is first coated with a mas" of

solder paste over the pads.Then each component is placed. The entire

board is then loaded into an infrared or nitrogen oven and ba"ed. The

solder paste melts on the pads and component leads to ma"e the #oint.

%&Electrical Testin4

2inished -% is chec"ed for electrical continuity and shorts at the timeof manufacture. This is done with a automated flying probe test

machine.It chec"s that the continuity of the trac"s matches your -%

file.It is mandatory for multi!layer boards. If you have a manufacturing

error on one of your inner layers it can be very difficult to fi.

%&Si4nat,re

=i"e any wor" of art( no board is complete without adding your name orsignature to itH A signature can be placed on any of the copper layers( or

on the component overlay.

Project Optica Fiber

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