FTTC in Cable TV Network
o Cable TV uses optical fibers to connect
and multiplex different cable channels
o Coaxial cables coming from individual
premises are multiplexed in the
junction
box and converted to the optical signals
o Optical signals are multiplexed using WDM
at switching office to create wider
BW
optical signals
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ERROR
DETECTION AND CORRECTION
Introduction
o Networks
must be able
to transfer data
from one device
to another with
complete
accuracy
o A system that cannot guarantee that the
data received by one device is
identical to the
data
transmitted by another device is essentially useless
o Anytime the data is TX from source to destination,
it gets corrupted on the way
o Many factors including NOISE can alter or
wipe out one or more bits of a given data
unit
o Reliable systems must have a mechanism
for detecting and correcting such ERRORS
o Error
detection and Correction
is implemented either
at the data
link layer or
at the
Transport
layer
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