Basic Node
3 Basic Node
This section describes the Basic Node functions, hardware and traffic interfaces.
3.1 System Architecture
The system architecture is based on a Node Processor Unit (NPU)
communicating with other plug-in units, via buses in the subrack backplane.
The buses are used for traffic handling, system control and power distribution.
10065
Plug-in Unit
Plug-in Unit
Power Filter
Unit
Node Processor
Unit
Backplane
High Speed
PCI
SPI
Power
BPI
TDM
Figure 6 System architecture
3.1.1 TDM Bus
The Time Division Multiplexing (TDM) bus is used for traffic routing between
the plug-in units. It is also used for routing of the DCN channels, used for
O&M data transport. The lowest switching level is E1 for traffic connections
and 64 kbit/s for DCN channels. The traffic connections on the TDM bus are
unstructured with independent timing.
The bus has a switching capacity of 820 Mbit/s. It is redundant for additional
protection against hardware failures.
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