8/10/2019 Notes Ch 10

1/5

0:02

this is lecture 10

0:04

fiber-optic Association lecture series on fiber optics

0:08this is our second lecture and fiber optic network design

0:12

discussing planning the network

0:18

once we determine the need for a fiber-optic network

0:22

we now have to start doing the serious planning

0:25

we have to decide what kind of communications euipment t!pes

0:29

her to be used where the links will be going

0:"2

how long will the! be where the cable will be placed in

0:"#

where the! an immediate spices and terminations will be done

0:40

when testing is reuired documentation is necessar!

0:44

and what standards relevant to this particular0:4$

pro%ect

0:52

the ne&t step is to establish the root of the lake

0:55

determine the path from point A to point '

0:58

their network will run how far it is

1:01

and what obstacles rain its wa! ()m outside plant link we might do that

1:0#

satellite photos like we show here and on a premise islamic we would do it on a

1:11

cab drawing a building

1:12

then we wanted to determine the communication needs so we know what kind

1:1#

of euipment

1:1$we were on on this network

8/10/2019 Notes Ch 10

2/5

1:24

ne&t we)ll want to mapped the route map

1:2$

and great detail will review the prancer maps and surve! the site

1:"2in person we want to do it in person and take pictures so ( have records that we

1:"#

can refer to

1:"$

later on in the planning process it)s necessar! to determine the e&act cable

1:4"

path and links determine the location slices and termination

1:48

what hardware going to be necessar! to support caps

1:51

we)re going to *as page and we)ll talk about that more in a minute

1:55

and then we)ll start looking at timing in the pool

1:5+

how long it will take us 20 components on the %ob site

2:02

what special euipment we)re going to need for installation

2:05

an all!2:11

ever! pro%ect we)re going to create documentation package

2:15

it is impossible to overemphasi,e the importance

2:20

()ve documenting the pro%ect at the design level

2:24

for estimating installation testing

2:28

troubleshooting and restoration ever! part of the process

2:"2

depends ()m having ver! good

2:"#

documentation

2:40

the communications euipment will be chosen to make the communication needs

2:4"

to the user

2:44whether the! be at Alcoa cable . compan!

8/10/2019 Notes Ch 10

3/5

2:48

a utilit! the militar! all the needs can be uite different

2:52

so the communications euipment must be carefull! specified b!

2:5#the customer and then it will be looked at

":00

for compatibilit! with the cable plant

":05

designer should understand how fiber-optic data links work

":0+

with the e&ception of fiber to the home which onl! uses 15 per

":1"

most fiber-optic data links transmitted over 25 !ears

":1$

and one in each direction for full-duple& transmission the

":22

transceivers a used to convert

":24

optical to electrical signals and vice versa

":2$

the! use lasers earl! da!s as transmitters and photodetectors

":"1

to convert optical signals back to electrical signals and receiver":"+

as the transmitter sends a signal down optical fiber

":42

the signal amplitude is attenuated adding attenuation the optical fiber

":4$

and reduced b! the loss of connectors are spliced

":51

so what we)re interested and is the amount of receiver power we have

":55

for an! given awa! that performance /aturda! link

":5+

is going to be determined b! its bearer rate for the number bits

4:04

received in error and that is a function of received optical power

4:08

it must have enough power for an adeuate signal to noise ratio

4:12

but not so much power that receivers overloaded

4:1+for each network we know how much loss it can sustain overla!ing

8/10/2019 Notes Ch 10

4/5

4:2"

so what we do is we calculate now

4:2#

it pro%ected loss r able plan and compare it

4:"0to the d!namic range ()ve the wake itself that wa! we know if we have

4:"5

adeuate amount of power

4:"$

when we get to the receiver we call this a link power budget

4:40

and we do it for ever! network we design for ver! long networks we ma! also have

4:4#

to consider chromatic dispersion

4:48

for polari,ation mode dispersion warm even multimode fiber dispersion

4:5"

her missus links

4:5+

oogle 3iber

5:00

optic link reuires a lot of hardware an! outside planet splice closures and

5:05

controlled environment polic! region5:0$

thoughts and pedestals an! premises networks is

5:11

wall rack mount a patch panels and wall outlets in cable trends

5:1#

the t!pe of hardware we need

5:1+

and a location that hardware is a ver! ver!

5:2"

essential part ever! network design

5:2$

and it)s one of the reasons that we said earlier it)s important

5:"0

actuall! do a site visit !ou know e&actl! where ever!thing is

5:"5

and !ou)ve got pictures to refer back to for !our design pro%ect

5:4"

we)re the fiber optic Association professional societ! a fiber optics

5:4$for more information on designing fiber optic networks and other technical

8/10/2019 Notes Ch 10

5/5