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Feature Overview
PA-MC-STM-1 Multiplexing Hierarchy
Figure 1 illustrates the synchronous digital hierarchy (SDH) multiplexing structure supported on the
PA-MC-STM-1. The PA-MC-STM-1 multiplexing structure is a subset of that defined in ITU-T G.707.
At the lowest level, containers are input into virtual containers (VC) with stuffing bits to create a uniform
VC payload with a common bit-rate, ready for synchronous multiplexing. The VCs are then aligned into
tributary units (TUs) where pointer processing operations are implemented. This allows the TUs to be
multiplexed into TU groups (TUGs). Three TU-12s can be multiplexed into one TUG-2.
Figure 1
PA-STM-1 Multiplexing Structure
E1
2.048 Mbps
C-12
VC-12
The TUGs are then multiplexed into higher-level VCs, which in turn are multiplexed into administrative
units (AUs).The AUs are then multiplexed into an AU group (AUG), and the final payload from the AUG
is then multiplexed into the Synchronous Transport Module (STM).
Benefits
The PA-MC-STM-1 port adapter provides the following benefits:
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Restrictions
The PA-MC-STM-1 does not support the following:
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12.0(14)S
2
TUG-3
x7
TU-12
x3
TUG-2
High-density IP aggregation
Reduction in provisioning costs
Improved cable management
Easier scaling of services
Improved network availability
VIP2
More than 256 logical channel groups per PA-MC-STM-1
Channel-associated-signaling (CAS) for voice channels
E1 Facility Data Link (FDL)
E3 and subrate E3
Multichannel STM-1 Port Adapter for the Cisco 7500 Series Router
x3
VC-4
AU-4
x1
x1
x3
VC-3
AU-3
x1
x7
x1
AUG
STM-1
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