Protection Mechanisms - Ericsson MINI-LINK TN R3 ETSI Technical Description

MINI-LINK TN R3 ETSI
3.9

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 81.
3.9.1 Overview
To ensure high availability, MINI-LINK TN R3 provides protection mechanisms
on various layers in the transmission network as illustrated in Figure 42 on
page 44.
•
•
•
Figure 42
protection mechanisms
44
Network layer protection using the 1+1 E1 SNCP mechanism provides
protection for the sub-network connection a-b in Figure 42 on page 44.
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 42 on page 44. 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 42 on page 44.
Equipment protection
=
Network Element (NE)
= Plug-in unit
MINI-LINK TN R3 provides high availability through various
Network layer protection
Physical link layer protection
2
c
a 1
3
5
6
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