equipment installation - facweb.northseattle.edufacweb.northseattle.edu/tfiegenb/mod 13...
TRANSCRIPT
Equipment Installation
Voice
Advanced Skill Set Not for the beginner
VOIP (Voice over Internet Protocol)
• “Internet telephony refers to communications services —voice, fax, Short Message Service, and/or voice-messaging applications— that are transported via the Internet, rather than the public switched telephone network (PSTN).” Wikipedia
• Resides on the HSD portion of cable networks
• Much greater flexibility than the switched network – Voice mail and call history can be checked from anywhere
via the internet
– Call notification as well as messages can occur via e-mail.
VOIP Quality of Service • “Things to consider are:
– Latency: Delay for packet delivery
– Jitter: Variations in delay of packet delivery
– Packet loss: Too much traffic in the network causes the network to drop packets
– Burstiness of Loss and Jitter: Loss and Discards (due to jitter) tend to occur in bursts”
• Quoted from: http://www.voip-info.org/wiki/view/QoS
• DOCSIS---Gives voice packets priority
PSTN • “The public switched telephone network (PSTN) is the
network of the world's public circuit-switched telephone networks.
• It consists of – telephone lines,
– fiber optic cables,
– microwave transmission links,
– cellular networks,
– communications satellites, and
– undersea telephone cables,
– all inter-connected by switching centers, thus allowing any telephone in the world to communicate with any other.” Wikipedia
ITU
• International Telecommunication Union
– Agency of UN
– ITU coordinates the shared global use of the radio spectrum
– Establishes world wide standards
– ITU formally Defined Wikipedia
Circuit Switched
• 10 digits
– Area code (3)
– Central office switch number (3)
– Telephone line (4)
• LNP / FMNP Ability to transfer lines to another service
– LNP Local Number Portability for fixed lines
– FMNP Full Mobile Number Portability (cell phones)
PSTN / Cable Phone
• PSTN
– control and voltage come from Central office
• Cable phone
– Power, dial tone, ring etc. come from eMTA
Off-hook (phone is in use)
• “The condition that exists when a telephone or other user instrument is in use, i.e., during dialing or communicating.
• Note: off-hook originally referred to the condition that prevailed when telephones had a separate earpiece (i.e., receiver), which hung from its switchhook until the user wished to activate it. The weight of the receiver no longer depresses the spring-loaded switchhook, thereby connecting the instrument to the telephone line.”
http://www.dreamstime.com/stock-photography-vintage-candlestick-phone-white-background-image25820822
Supervisory Voltage
• Is applied to the MTA/eMTA phone while the phone is on hook (i.e. not in use)
• This voltage is what tells the MTA/eMTA the phone is off hook (in use)
• Should be -48vDC
– http://www.flashcardmachine.com/cct4-mod-41workingwithbusinessclassequipment.html
CBR / UGS
• UGS Unsolicited Grant Service – Enables voice packets to have priority in the VOIP
system
– Without priority voice packets may arrive out of sequence
• CBR Constant Bit Rate – Enabled through DOCSIS to use UGS
• UGS/CBR Reduces latency and jitter
• Refer to pg. 13.4
8P8C
• RJ 45 connector • Ethernet cables are terminated
with RJ45 connectors. – Often termed an 8P8C connector,
this means there are eight positions which are occupied by eight contacts
• Pg. 13-5 – RG-11 is a 4P4C (4pin, 4
connection). However it is universally used as a 6p6c, can be used 2,4 or 6 wire configuration
RJ-11
• Pin 3 & 4 would support 1 line.
• 2 & 5 a second line
• 1 & 6 a third
• Image from Cisco: http://www.cisco.com/en/US/docs/voice_ip_comm/unity/3x/failover/guide/31/FOG_400.html
Demarcation
• Point where phone company responsibility ends and customer responsibility begins
• Network interface device
Monitored Alarm Systems
• http://wwwb.comcast.com/home-security/?CMP=KNC-IQ_ID_47325674-VQ2-g-VQ3--VQ6-28347533025&iq_id=47325674
ILEC
• Prior to installation disconnect from the Incumbent local exchange carrier (ILEC)
• Currents from both carriers could present a hazard
Qualifying the Drop
• See Chapter 10
MoCA VOIP Amplifier
• Home Amplifier
– Comscope Amplifier
– Features VOIP passive connecter that is not powered so phone will work when power is lost
– This is not the case with older home amplifiers
RJ31-X • Provides for line seizure in alarm systems: • “Standard digital communicators use a regular dial
tone phone line in order to send their signals to the Central Station.
• An alarm message is somewhat like a fax transmission, with a dial sequence, a handshake, a data transmission, another handshake and a hang up.
• If the line is in use when an alarm message starts, or a phone instrument is left off hook, there needs to be a way to clear the line and override all other call activity. Otherwise, the signal could be seriously delayed or blocked completely.”
• Quoted from Verizon.net
DACT
• Digital alarm communicator transmitter
http://www.cpeinterlink.com/fire.html
Example of DACT
FACP: Fire
Alarm Control Panel
Inside wiring - Hybrid
• Pg. 13.10
– eMTA Home Run (HR) method
– eMTA Hybrid using HR & loop
66M1-50 Block
• Punch Down Block
• Supports up to 50 pairs of twisted pair cables
• The name 66 has to do with the part number
• Picture to the right from Amazon.com
Bridge Clip
• Picture to the right from Amazon.com
• Provide electrical continuity between right and left side of block
Tip and Ring
• Tip is ground (it is positive with respect to the ring ) +
• Ring is battery (negative voltage) – Lord of the Rings—ring was negative
T568A standard
• T568C standard addresses phone wiring
• How to wire a phone jack
http://www.lanshack.com/wire_phone_jack.aspx
Outlets
• See pg 13.12
• Modular Connector
– Allows for variation in inputs
PS2?
Measuring Ground Fault pg. 13.16
• Text error
– Should not be measuring an AC voltage with meter set to measure Ohms
Shorts and Crosses
• See 13.16
• Opens and Shorts
Polarity Reversal
• Pg 13.17
Digital Phone Installation
• Read pg 13.18-13.20
• Don’t like to directly read, but a lot of detail
192.168.100.1 from my eMTA
192.168.100.1 from my eMTA (DOCSIS 2 Modem)
Hardware Firmware Versions
Event Log
Event Log cont.
Provisioning
TFTP file: provisions modem for up and down speeds pg. 12.14
CM State
Provisioning
• “Provisions eMTA with the CMTS to allow communications between the eMTA and the headend
• Places the device on the customers account for billing” pg. 13.22
Silver Satin
• Line chord
– 7,14 or 25 foot length
– See pg 13.32
Modular Jacks / Connector
• Modular outlets can be easily upgraded.
• “The term "modular connector" arose from its original use in a novel system of cabling designed to make telephone equipment more modular.” also “RJ”
Siemens Product http://www.automation.siemens.com/mcms/industrial-communication/en/ie/cabling-technology/fast-connect-modular-outlet/pages/fast-connect-modular-outlet.aspx
Station Wire
• Station wire-Originally the term used for the twisted pair telephone wire used to connect "stations“ (telephones and other terminal equipment) to PBXs.
• Also used to describe the wire used to connect the telephones in customers' homes to the NIU (network interface unit) that provides the interface to the local telephone provider. Quoted from SCTE glossary
What kind of wire is this?
Twisted pair
Line chord
Patch Panel Requires
punch down tool
http://images.google.com/images?hl=en&q=scotchlok%20wire%20connector%20uy&um=1&ie=UTF-8&sa=N&tab=wi
Vetco Electronics http://shop.vetcosurplus.com/catalog/
UY connectors enable connecting wires without the need of isolation stripping. They are filled with gel, which protects wires from corrosion.
How to connect video 2:59