The arrival of SDH
SDH offers significant advantages over the PDH. SDH based
on a digital frame that provides high level, in addition to the top
speed (higher than PDH):
• Greater flexibility as to the possibility of extracting or
to insert directly a component of said multiplex
• Ease of operation and maintenance (Flow
important for these functions)
• An opportunity to move towards high speed (frames
synchronous broadband are built by multiplexing
phase the basic entity. This entity defines the basic
implicitly all frames high speed, the limitation
is more than technological)
• An interconnection of broadband systems facilitated by the
normalization of the frame line and optical interfaces
corresponding
• The network architectures providing security against
the line faults or equipment
• The modularity of SDH equipment is more suited to
advances in technology.
The SDH frames
There are different frames in SDH. The base frame is called
STM-1 (Synchronous Transport Module level 1).
STM-1 to a length of 2430 bytes. Frequency transmission
is 125ns, which gives us a rate of:
2430 * 8 / 125 = 155.52 Mbit / s.
In this frame, 9 bytes are reserved for the management and
addressing, leaving a payload of 150.336 Mbit / s.
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