My work as a telecommunications headend tech Powerpoint presentation 3

My Work as a Telecommunications Headend

Engineering Tech IIby Mark Keefer

Building, troubleshooting and daily operations of a complex telecommunications headend and data center.

Knowing how to get into hundreds of pieces of telecommunications equipment, wire it, configure it, test it, troubleshoot it and fix it. Keep the customers services working without interruption is top priority.

Motorola SEM & APEX devices to take IP Streaming Video and Modulate it onto a QAM RF carrier to send to customers.

Managing and routing live digital streaming IP Video from many sources across the network.

Configure management network and video network and QAM RF Channels.

Encoding analog audio and video into digital streaming video, two common devices are Scientific Atlanta and Big Band Digital Encoders.

Being skilled with IP networking and also an expert in RF analog and digital signals, Quadrature Amplitude Modulation (QAM), DOCIS, QPSK and telemetry signals, audio and video, RF measurement, balancing RF and ensure signal quality using RF meters, spectrum analyzers and QAM analyzers.

Configure Harmonic NSG 9000s, QAM modulators, for streaming IP video for Video On Demand services.

Working with and troubleshooting network switches and routers, wiring, replacing cards, power supplies, SFPs, GBICs, fiber and CAT 5cables, field support.Cisco 7609, 2960, , Juniper, ARRIS C4 CMTS (CAMs, PICs, Fabric cards), Ciena, Nortel transport…

Ciena-NortelOptera 6500 serial rs232 input port 9600baud nn1to initial enter IP, and GUI user interface networkgoes into a CMB tray for drop/add, basically a MUXOptera 5200goes into a OMX tray for drop/add, basically a MUX 3500Passport - command string commandsLong Haul - old legacy, most being decommissioned - command string commandsQB5000 command string commandsFLM150FLM2400

Metro-E Ciena Switches311's Serial cables to copy over scripts3930's3916

Cisco 7600 series 7609 UR Routersand smaller Catalyst routers and switches various model like theCisco 2960s and others

ARRIS C4 CMTS

ARRIS C4 CMTS• Installation, wiring and FMP (First Modem Provisioning) testing of ARRIS C4 CMTS, before the CMTS could be put into

production it would have every port tested for both cable modem and phone services, voice quality, dial out and receive calls, DHCP IP and internet connection, Ping, Trace Rout, data speed tests and RF level and signal quality.

Daily operations, maintenance, testing, troubleshooting, repair replacement of cards, CAMs, PICs, power supplies, failover, scheduled and emergency maintenance tickets, 911 check, NCP (Node Combining Plan) changes and documentation. Engineering site support working with the National Operations Center and field for all work done on this equipment.

Delivering High Speed Internet, Phone, Data services

Simplified view of only one Node fed from a CMTSNot shown here are the CMTS fiber connections to the UR router nor connections into the term server.

DS0

DS1

DS2

DS38

WAY

SPL

IITER

8 W

AY S

PLIIT

ER8

WAY

SPL

IITER

8 W

AY S

PLIIT

ER12

dB

Loss

12 d

B Lo

ss12

dB

Loss

12 d

B Lo

ss

52 dBm

52 dBm

52 dBm

52 dBm

717 MHz 256 QAM723 MHz 256 QAM 729 MHz 256 QAM 735 MHz 256 QAM 8

Way

Com

bine

r12

dB

Loss

All Cable Loss Calculated forRG-59 Headend Cable

9.75 dB Loss/100ft @750MHz

150 FT RG-59 14.5dB Loss

12.5 dBm @ 735MHz39 dBm @ 735MHz

DSPICC

10 FT RG-59 1 dB Loss

20 FT RG-59 2 dB Loss

10.5 dBm @ 735MHzAmp Input

2 W

AYCo

mbi

ner

4 dB

Los

s14 dB MAXNETRF AMP

SA PRISMA II OPTICAL TX

9 dBm 1310nm

100 FT RG-59 9.75dB Loss

24.5 dBm @ 735MHz 22 dBm @ 735MHz 18 dBm @ 735MHz

25 FT RG-59 2.5 dB Loss

8.75 dBm @ 735MHzInto Optical TX TX10111

SAMPLE HEADENDDRAWING

By Mark Keefer

NC AMP 10111

150 FT RG-59 14.5dB Loss

20 FT RG-59 2 dB Loss

10.5 dBm @ 735MHzAmp Input

2 W

AYCo

mbi

ner

4 dB

Los

s

10 dB MAXNETRF AMP

SA PRISMA II OPTICAL TX

12 dBm 1310nm

100 FT RG-59 9.75dB Loss

22 dBm @ 735MHz

25 FT RG-59 2.5 dB Loss

8.75 dBm @ 735MHzInto Optical TX TX10112

24.5 dBm @ 735MHz

14 dB MAXNETRF AMP

NC AMP 10112

-20 dB OutputTest Point

-20 dB OutputTest Point

VOD INPUT

VOD INPUT

OM INPUT

OM INPUT

Broadcast Input

Broadcast Input

12.5 dBm @ 735MHz

-20 dB OutputTest Point

-20 dB InputTest Point

HSI/PHONE/DATA DOWNSTREAM

HSI/PHONE/DATA DOWNSTREAM

HSI/PHONE/DATA DOWNSTREAM

HSI/PHONE/DATA DOWNSTREAM

ARRIS

-20 dB OutputTest Point

8 W

ayCo

mbi

ner

12 d

B Lo

ss

-20 dB InputTest Point -20 dB Input

Test Point

18 dBm @ 735MHz

-20 dB Input test Point

-20 dB Output Test Point

-20 dB Output Test Point

-20 dB Input test Point

-20 dB Output Test Point

-20 dB Output Test Point

-20 dB Input Test Point

-20 dB Input Test Point

-20 dB InputTest Point

• Making design drawings for existing headend or something new to be built.

• Gather information to determine what will be needed to build a design.

• Adapting basic concepts to a unique headend facility to build a new service.

• Being able to calculate RF signal loss and equipment needed for any application.

• Being able to put it all together in a design, gather materials and build it.

Forward LaserOptical TransmitterHeadend

Return LaserOptical TransmitterIn Node in field

Optical ReceiverIn Field Node

ReturnOptical ReceiverIn Headend

1310 nm

1550 nm Hea

dend

Example15 miles

Fiel

d N

ode

SINGLE FIBER TO NODE CONFIGURATION

MUX

USING CWDM MUXING/DEMUXCorse Wave Division Multiplexing

MUX

Optical Receiver

Optical Receiver Optical Transmitter1550 nm

Optical Transmitter1310nm

Forward LaserOptical TransmitterHeadend

Return LaserOptical TransmitterIn Node in field

Optical ReceiverIn Field Node

ReturnOptical ReceiverIn Headend

TWO FIBERS TO NODE CONFIGURATION

1310 nm

1550 nm

Hea

dend

Example15 miles

Fiel

d N

ode

Optical Receiver

Optical Receiver

Optical Transmitter1310nm

Early years of career developing skills in the field working with and updating design maps. Troubleshooting and correcting design flaws.Design maps made with wrong footages and incorrect cable types often needed a field redesign to correct major problems. All part of the job.