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Time-division multiplexing usually requires specialized hardware to maintain timing synchronization. This hardware becomes even more complex when dynamic bandwidth allocation is required.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
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Low Cost Time Division Multiplexing with Dynamic Bandwidth Allocation
on a Satellite Channel
Time-division multiplexing usually requires specialized hardware to maintain
timing synchronization. This hardware becomes even more complex when
dynamic bandwidth allocation is required.
This article describes a method in which timing synchronization is obtained
from the satellite link propagation delay and the modem clock, and managed
without significant resources by any Data Communication Equipment (DCE).
The proposed method will be described assuming a point-to-point link
connecting earth stations A and B.
Station A sends a special signal at the time when it has just the number N of
bits to send that can be transmitted during a propagation delay Tp (minus a
guard time Tg). Vb (Tp - Tg) N = ------------ (1) 1000 where Vb is the bit rate of the modem.
A propagation delay later all these bits are in the transmission channel, and
the special signal arrives at station B. At this moment, station B starts
transmitting. Half a propagation delay later, the bit stream from station A to
station B will have completely transited the satellite transponder before the bit
stream from station B to station A arrives there. Therefore, there is no collision.
Another half a propagation delay later, the bit stream from station B to station A
will have arrived at station A, authorizing it to transmit. This closes the circle.
Dynamic Bandwidth Allocation can be performed as follows: If a station has
nothing to transmit, it still must transmit the special signal for synchronization. Its
frame window (Tp - Tg) is lost. If a station has less bits to...