Basic Node
3.10 Protection Mechanisms
This section describes the protection mechanisms provided by the Basic Node.
Protection of the radio link is described in Section 4.6 on page 93.
3.10.1 Overview
To ensure high availability, MINI-LINK TN R4 provides protection mechanisms
on various layers in the transmission network as illustrated in Figure 41 on
page 51.
• Network layer protection using the 1+1 SNCP mechanism provides
protection for the sub-network connection a-b in Figure 41 on page 51.
Network layer protection uses only signal failure as switching criterion.
• Physical link layer protection using MSP 1+1 indicated by the link c
between two adjacent NEs 1 and 2 in Figure 41 on page 51. Physical
link layer protection uses both signal failure and signal degradation as
switching criteria.
• By routing the protected traffic in parallel through different physical units,
equipment protection can also be achieved. An example using two plug-in
units is shown for the NEs 1 and 2 in Figure 41 on page 51.
1
2
4
3
6
5
a
b
c
=
= Plug-in unit
6627
Equipment protection
Network layer protection
Physical link layer protection
Network Element (NE)
Figure 41 MINI-LINK TN R4 provides high availability through various
protection mechanisms
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12/221 02-CSH 109 32/1-V1 Uen A 2008-03-14
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