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