Basic Node
3.5.2.1.5 VC-12
This block maps 63xE1 (or 21xE1) to/from 63xVC-12 (or 21xVC-12) adding
overhead bytes.
The LTU B 155 registers 21xE1 interfaces from the first TUG3, that is the KLM
numbers 1.1.1-1.1.3, 1.2.1-1.2.3 through 1.7.1-1.7.3.
3.5.2.1.6 MS/RS VC-4
This block maps the VC-12s to/from one VC-4 adding path overhead.
The block provides the electrical and optical STM-1 line interfaces for external
connection.
3.5.2.1.7 SDH Equipment Clock
This block handles timing and synchronization.
The LTU 155 utilizes the synchronization functions described in Section 3.10
on page 52.
3.6 Ethernet Traffic
3.6.1 Overview
• ETU2 provides five 10/100BASE-T interfaces and one 10/100/1000BASE-T
interface. See Section 3.6.3 on page 33.
• NPU2 provides one 10/100BASE-T interface, combined for Ethernet Traffic
and Ethernet Site LAN. See Section 3.3.1 on page 20.
• NPU3 provides two 10/100BASE-T interfaces, one for Ethernet Traffic and
one for Ethernet Site LAN. See Section 3.3.1 on page 20
• ATU provides one 10/100BASE-T interface for Ethernet Traffic and one
10BASE-T interface for Ethernet Site LAN. See Section 5.2 on page 94.
The Ethernet traffic is transported between NEs in multiple E1s, over a single
hop or through a network. Figure 33 on page 32 shows an example of how the
different units can be used in a network.
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4/1555-CSH 109 32/1-V1 Uen B 2007-09-14
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