Basic Node
• System control and supervision
• IP router for DCN handling
• SNMP Master Agent
• Ethernet interface for connection to a site LAN
• Storage and administration of inventory and configuration data
• USB interface for LCT connection
There are also some specific functions associated with each NPU type as
summarized below.
NPU1 B
• 2x(4xE1) for traffic connections
• Three User Input ports
• Three User Output ports
NPU2
• 1x(4xE1) for traffic connections
• Filters the external power and distributes the internal power
• The Ethernet interface can be used for Ethernet bridge
applications
NPU3 • 1x(4xE1) for traffic connections
• Two User Output ports
3.3.2 Functional Blocks
This section describes the internal and external functions of the NPUs, based
on the block diagrams in Figure 25 on page 22, Figure 26 on page 22 and
Figure 27 on page 23.
21
4/1555-CSH 109 32/1-V1 Uen B 2007-09-14
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