Chapter 5

vocabulary

100

Analog

Vary indefinitely and continuously

200

Wavelength

Hz/MHz): Distance between corresponding points on a wave’s cycle

300

Phase

(Degrees): Progress of a wave over time in relationship to a fixed point

400

Modem:

Modulates digital signals into analog signals

500

TDM

• (Time Division Multiplexing)

• 
  

  • Divides a channel into multiple time slots

  • Separate time slot is assigned to every node

vocabulary

100

Baseband:

 Transmissions that are carried on a single channel, with no other transmission sharing the media

200

Multiplexing

Allows multiple signals to travel simultaneously over one medium

300

how does multiplexing work

Multiplexing works by dividing a single channel into multiple subchannels

400

Statistical Multiplexing

Transmitter assigns slots to nodes according to priority and need

500

FDM

 (Frequency Division Multiplexing)

• Assigns a unique frequency band to each subchannel

• Signals are modulated with different carrier frequencies

vocabulary

100

• Broadband

: Technologies in which multiple transmission share a single media

200

Multiplexer

• : A device that can combine many signals on a channel

  • Required at the transmitting end of the channel

  • The demultiplexer is required at the receiving end of the channel

300

WDM

•  (Wavelength Division Multiplexing)

• Enables one fiber-optic connection to carry multiple light signals simultaneously

400

DWDM

• (Dense WDM)

  • Single cable can carry between 80 and 160 channels

  • More wavelengths are used for signaling

500

CWDM 

• (Coarse WDM)

  • Channels are spaced more widely apart across the entire frequency band

  • Cheaper than DWDM and carries less channels

vocabulary

100

• STP (Shielded Twisted Pair)

• STP (Shielded Twisted Pair)

  • Uses additional shielding to prevent EMI

  • More costly than UTP

200

• UTP

•  (Unshielded Twisted Pair)

  • Consists one or more insulated wire pairs encased in a plastic sheath

300

• SMF

• (Single Mode Fiber)

  • Narrow core

  • Light travels in a single path over the core

  • Higher bandwidths

  • Longer distances

400

MMF

• (Multimode Fiber)

  • Larger core

  • Multiple pulses of light are transmitted

  • Lower bandwidths

  • Higher attenuation

  • Cheaper than SMF

500

APC 

 (Angled Polished Connector): Latest ferrule technology that is angled at the ends (8 degrees)

vocabulary

100

what are two examples of WDM (Wavelength Division Multiplexing)

• DWDM (Dense WDM)

• CWDM (Coarse WDM)
  
  

200

UPC 

• UPC (Ultra Polished Connector): Polished ferrule with increased efficiency

300

• PC 

• PC (Physical Contact): Older type of ferrule with a curved tip

400

• GBIC 

• GBIC (Gigabit interface converter): Standard type of modular interface that supports Gigabit Ethernet

500

OPM (Optical Power Meter):

Measures the amount of light power transmitted on a fiber-optic line