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Optical Fiber Communications 4th Edition by Gerd Keiser
Edition 4ISBN: 978-0073380711Optical Fiber Communications 4th Edition by Gerd Keiser
Edition 4ISBN: 978-0073380711 Exercise 1
At the lowest TDM level of the digital service scheme, 24 channels of 64 kb/s each are multiplexed into a 1.544-Mb/s DS1 channel. How much is the overhead that is added
( b ) The next higher multiplexed level, the DS 2 rate, is 6.312 Mb/s. How many DS 1 channels can be accommodated in the DS 2 rate, and what is the overhead
( c ) If the DS 3 rate that is sent over a T 3 line is 44.376 Mb/s, how many DS 2 channels can be accommodated on a T 3 line, and what is the overhead
( d ) Using the above results, find how many DS 0 channels can be sent over a T 3 line. What is the total added overhead
( b ) The next higher multiplexed level, the DS 2 rate, is 6.312 Mb/s. How many DS 1 channels can be accommodated in the DS 2 rate, and what is the overhead
( c ) If the DS 3 rate that is sent over a T 3 line is 44.376 Mb/s, how many DS 2 channels can be accommodated on a T 3 line, and what is the overhead
( d ) Using the above results, find how many DS 0 channels can be sent over a T 3 line. What is the total added overhead
Explanation
Verified
Verified
(a)
At each multiplexing level some overhead bits are added for synchronization purpose. The lowest TDM level of the digital service scheme, 24 channels of
each are multiplexed into a 
channels.
At digital system
the overhead is, 
Thus, overhead that is added at 
channel is 
.(b)The number of 
channels can be accommodated into digital system 
are, 
Select maximum possible integer 
value such that term 
should not greater than 
. 
Thus, Four 
channels can accommodate into digital system 
.At digital system 
the overhead is, 
Thus, overhead that is added at 
channel is 
.(c)The number of 
channels can be accommodated into digital system 
are, 
Select maximum possible integer 
value such that term 
should not greater than 
. 
Thus, seven 
channels can accommodate into digital system 
.At digital system 
the overhead is, 
Thus, overhead that is added at 
channel is 
.(d)The number of 
channels can be accommodated into digital system 
are, 
Select maximum possible integer 
value must be multiples of 24 and term 
should not greater than 
. 
Thus, 672 
channels can accommodate into digital system 
.At digital system 
the overhead with respect to 
is, 
Thus, overhead that is added at 
channel is 
.
At each multiplexing level some overhead bits are added for synchronization purpose. The lowest TDM level of the digital service scheme, 24 channels of
each are multiplexed into a channels. At digital system
the overhead is, Thus, overhead that is added at channel is .(b)The number of channels can be accommodated into digital system are, Select maximum possible integer value such that term should not greater than . Thus, Four channels can accommodate into digital system .At digital system the overhead is, Thus, overhead that is added at channel is .(c)The number of channels can be accommodated into digital system are, Select maximum possible integer value such that term should not greater than . Thus, seven channels can accommodate into digital system .At digital system the overhead is, Thus, overhead that is added at channel is .(d)The number of channels can be accommodated into digital system are, Select maximum possible integer value must be multiples of 24 and term should not greater than . Thus, 672 channels can accommodate into digital system .At digital system the overhead with respect to is, Thus, overhead that is added at channel is .
Optical Fiber Communications 4th Edition by Gerd Keiser
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