Fig 1 - uploaded by Loay Alzubaidi
Content may be subject to copyright.
SDH Multiplexing Structure When a VC-12(LO trail) is mapped into a VC-4 (HO trail), then the HO trail cannot support a future VC-4 request since the full capacity is not available any more, but it can accommodate 2 VC-3 & 22 VC-12. If 3 VC12s are provisioned in the 3 different VC-3s, then that VC-4 trail cannot accommodate any further VC-3 requests, because all VC-3s are broken. It can accommodate 60 VC-12 only or 18 VC-2 and 6 VC-12.
Source publication
The Synchronous Digital Hierarchy (SDH) and the
Synchronous Optical Network (SONET) are international
standards for high speed telecommunication over optical
networks, which can transport digital signals in variable
capacities. SDH/SONET is a time division multiplexing
technology widely used for the delivery of voice and data
services in access and...
Context in source publication
Context 1
... are then multiplexed into tributary unit groups (TUG) which are then multiplexed into higher order virtual containers like VC-3 and VC-4. They are pointed to by their administrative unit (AU) pointers and then multiplexed into administrative unit groups (AUG) which are in turn multiplexed into one of the possible Synchronous Transport Modules (STM) which are the units of transmission in SDH see Fig 1. Due to the multiplexing structure of SDH, each link has various integer units of capacity and the free capacity cannot be obtained simply by subtracting the allotted capacity from the maximum capacity. ...
