Volume 3
Terms
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- What does PWM affect
- width or duration
- RS-232 transmit pin
- 2
- What is dispersion
- light pulses spread out as they travel down the fiber
- Color code for UTP
- blue, orange, green, brown
- what does dispersion limit
- fiber's bandwidth
- What does ARQ do
- reciever sends retransmit signal if error found
- In FM, what does the carrier phase shifts at
- rate of modulating signal
- What year did the EIA develop telecomm cabling standards
- 1985
- RS-232 receive pin
- 3
- What does PIM diode do
- converts one photon to one electron
- What is V.35 used for
- internodal trunks between X.25
- Two types of dispersion
- modal & material
- When does employment phase begin
- when first element of convoy departs
- principals of refraction include what
- normal, angle of refraction, angle of incidence
- RS-232 data set ready pin
- 6
- 2 sidebands, no carrier
- DSBSC
- Fiber connector w/no keying device
- Sub-minature, Type A (SMA)
- What is the spectral range of LED
- 700-900 nm
- what is spelled out on the frag order
- frequencies and configurations
- 5 parts of fiber optics link
- driver, source, optic fiber, detector, output circuit
- What is AEFC
- nerve center for all deployment activity
- What does PAM affect
- amplitude
- RS-232 terminal ready pin
- 20
- RS-232 9.6 Kbps length
- 5,000 feet
- RS-530 connector type
- 25-pin D-type (DB-25)
- What authority does AEFC not have
- No chain of command over AEF units
- First step in the recovery
- safety briefing
- Why twist multipair cable
- reduce crosstalk
- Most common error correction technique
- automatic retransmit on request (ARQ)
- What do sidebands take power from
- modulated carrier
- The two reasons to modulate
- ease of radiation & channel allocation
- NACC says how many network problems are cable related
- 70%
- RS-232 stop bits
- 1, 1.5, 2
- Three requirements of fiber light source
- Risetime fast enough to meet bandwidth, Provide enough optical power, wavelengh must take advantage of low-loss propagation
- What is block check sum used with
- LRC
- What does modulation index equal
- frequency deviation/frequency modulating signal
- What must be done to radiate over long distances
- change to analog format
- What determines what light detectors can pick up
- noise floor, signal-to-noise ratio (SNR)
- What must be done to transmit low frequency signals at higher frequencies
- modulation
- How do LEDs differ from lasers
- LEDs incoherent & Lasers coherent
- What do synncronous transmission do with charactors
- blocks many charactors together
- When is turn around complete
- post deployment inspections complete, maintenance actions documented, supply actions documented and items requesitoned
- What do FM sidebands need to be significant
- at least 1% of total power
- What standard uses much of the same pins as RS-232
- RS-530
- What is the STP bendign radius with a sheath
- 6 inches
- Max speed of CAT4
- 20 Mbps
- RS-422 10 Mbps length
- 40 feet
- What is material dispersion
- different velocities for separate wavelenghts
- Wht does the backbone provide
- interconnectivity between buildings
- What are APDs suitable for
- high-speed, long-distance
- What principal does fiber optics work on
- total internal reflection
- What does the surface emitter have
- etched will in GaAs
- What is the PN junction
- depletion region
- Minimum RS-232 pins
- 2, 3, 7
- What is the bending radius of STP without a sheath
- 3 inches
- In RS-232, if connecting two computers what must cross
- 2 & 3, 4 & 5, 6 & 20
- What is the advantage of SSBSC
- 1/2 bandwidth required
- What is the purpose of RS-232C
- provide compatability between various communication devices
- When does the employment phase end
- when the end-ex order is received
- When does the communications network end
- When the communications end-ex order is received
- What varies frequencies of signals
- FM
- How does the FM oscillator deviate
- Deviates above carrier frequency during positive half cycle of the modulating signal
- Why was RS-530 developed
- Due to the disadvantages of RS-449
- In FM, the rate of deviation is proportional to what
- frequency of the modulting signal
- When does fiber require shielding
- When constructed with metallic sheild
- What is the pull tension for unshielded UTP
- 25 lbs
- What is the makeup of a patch cord
- one connector at each end
- What is the life of the cabling systems that EA come up with
- 10 years
- What are the 3 fiber lightsources
- LED semiconductor laser diode, non-semiconductor laser diode
- What part of DSBSC carries info
- amplitude & phase
- What is modal dispersion
- different paths of light in various modes
- What does LRC check
- entire horizonal line for parity
- When is CRC most effective
- When blocks are greater then 512
- what is dark current
- small current with no light
- What are the two ways to connect equpment to transmit serial
- single-ended (unbalanced) & differential (balanced)
- What material is used for semiconductor photodiodes
- silicon
- What is numberical aperture
- fiber's light gathering capability
- What is STP backbone made out of
- 22 or 24 AWG
- What is the fiber optics light range
- 750 to 1500
- What is used to exctract info from the DSBSC
- heterodyne detector
- 1 sideband, no carrier
- SSBSC
- Max speed of CAT5
- 100 Mbps
- RS-232 clear to send pin
- 5
- What is the UTP benging radius
- 1 inch
- What does the AEFC ensure
- ensures AEFs maintainted at peak readiness
- What are broadcast facility records for
- records and drawings pertaining to broadcast system facilities
- What standard is for balanced cirucits
- RS-422
- What is attenuation in fiber described in
- dB/km
- What are the line driver volts for RS-422 and RS-423
- 4.0 to 12.0 volts peak-to-peak
- What is the RS-422 transition region
- -2.0 to +2.0 volts
- What is the DTE
- source and destination of data
- What are the 4 steps in projects
- Inventory, familarization, review, document findings
- RS-423 100 Kpbs length
- 300 feet
- What does Snell's Law state
- if light enters junction of two media at different refractive indices beyond the critical angle, the light is totally internally reflected
- How can Fresnel losses be reduced
- by using index-matching fluids
- What is RG-58 known as
- thinnet
- What is the DCE
- device which transfers data to end point
- What does uniform quantizing do
- define conded amplitude values as steps of equual amplitude range
- What does non-uniform quantizing do
- provide more coded amplitude levels at low signals levels with fewer at high signal levels
- What is done in the review phase
- identify and solve any potential problems
- What are UTCs for
- systematic planning of force packages
- What is the UTC for comm & info
- 6K
- What is the ATM transmission unit
- one charactor in length
- To recover intel from DSBEC, you must reinsert carrier frequency at what
- exact frequency & phase modulation
- What is the ATM parity bit for
- determines if transmission good or bad
- What is 98% effective when used together
- VRC & LRC
- RS-232 56Kbps length
- 50 feet
- How is dispersion measured
- ns/km
- What does responsivity respond on
- wavelength of light
- What is briefed to personnel
- security measures, local conditions, purpose of deployment, estimated duration
- What does band limiting do
- calculates highest and lowest freqencies
- RS-422 10Mbps length
- 4,000 feet
- What is optical pwoer expressed in
- microwatts & milliwatts
- What is the refractive index
- ratio of speed the light in a vacuum to its speed in a medium
- how often are EIA standards reviewed
- 5 years
- In FM, the amount of oscillator frequency change relationed with the signal
- directly proportional ot the amplitude of teh modulating signal
- What are reasons for deployements
- war, national emergency, natural disaster, practice, readiness inspection
- What are the twon important factors of light propagation
- refractive index & angle which the light strikes the junction of the material
- What does the system engineering phase include
- completion of cable sheets, planning system cannibalization, obtaining necessary freuqncy assignments, cre assignment sheets, technical control config, circuit engineering
- When is the frag order used
- used for each tactical operation
- What is the Nyquist sampling theorem
- taking samples at twice the highest frequency in the band-limited signal
- In fiber, attenduation comes from what two things
- absorption and Rayleigh scattering
- RG-58 max length
- 185 meters
- Two types of photodetectors
- positive intrinstic negative (PIN) & avalanche photodiode (APD)
- In PM, the carrier phase shifts at what
- the rate of the modulating signal
- What is the makeup of breakout cables
- connector at one end, multifiber cables at other
- what is the maximum distance of horizonal cables
- 90 meters
- What is MEFPAK
- AF system for UTC package management
- What are the two designs of LEDs
- edge-emitter & surface emitter
- what are the results of overbending fiber
- microbending & macrobending
- What are the steps to pulse code modulation
- band limiting, sampling, quantizing, encoding
- What interconnects backbone media to horizontal media
- mechanical terminators, patch cords, jumper cables
- What prevents direct contact of securing devices to cable's outer sheath
- cable shims
- PPM affects what
- position
- How effective is CRC
- 99%
- How does light bend away from the normal
- passes from a higher-index material to a lower one
- What varies amplitude of the carrier
- AM
- In AM, what needs 2x bandwidth to transmit
- DSBEC
- Disadvantage of DSBEC
- wastes power
- What is forward error control
- recieving end corrects errors
- FM produces how many sidebands
- infinite
- Fiber Optics immune to what
- EMI
- What does AEFC maintain
- lessons learned library from previous deployments
- What is ATM
- High-bandwidth technology with speeds at 600 Mbps or more
- Makeup of Pigtail
- connector at one end and spliced at other end
- What does sampling do
- converts continuous signal into discreet signal
- What is light
- elecromagnetic radiation in the wavelength range
- What does quantizing do
- finite values replaces infinite values
- 8 PSK produces how many bits
- 3 bits
- one-millionith of a meter is
- micron
- FCC establishes limits on what
- modulating signal
- what are post deoployment converence actions
- discuss equipment and circuit problems
- How many AEFs are there
- 10
- What determines the frequency of the wave
- Energy posessed by the photon
- In FM, what is amount of deviation proportional to
- amplitude of the modulating signal
- Max RG-58 length from horizontal to DTE
- 15 meters
- RS-232 logic 0 volts
- +5 to +15 volts
- RG-58 pulling tension
- 25 lbs
- Why divide backbone and horizontal cabling structures
- Keeps LAN/WAN managable
- How many pair grouping in UTP
- 25 pairs
- What is pull tension on shielded UTP
- 450 lbs
- Purpose of AEFs
- meet steady-state rotational reqrirements for forward deployed forces
- 1 carrier and 2 sidebands
- DSBEC
- RS-232 logic 1 volts
- -5 to -15 volts
- function of RS-232 start bit
- indicates beginning of serial character
- What topology distributes backbone and horizontal fiber optic cable
- star
- How many cross-connects are allowed from MC to horizonatal interface in TC
- 2
- What is the single-mode fibers backbone length
- 60 km
- What is a trigger point
- When more forces are required then the AF maintains
- VRC checks for what
- odd or even parity
- LED stands for what
- light emmiting diode
- Non-uniform quantizing and companding decreases the length of the code from
- 11 to 7