MINI-LINK TN R3 ETSI
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Tx
Rx
Tx
Rx
Protected E1
Unprotected E1Unprotected E1
Protected E1
1+1 E1 SNCP group
1+1 E1 SNCP group
Link or
sub-network
Figure 43 1+1 E1 SNCP principle
Performance data is collected and fault management is provided for unprotected
as well as protected E1 interfaces (that is the 1+1 E1 SNCP group). This gives
accurate information on the availability of network connections.
3.9.2.2 Ring Protection
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Ring
Tree
Star
Figure 44 Network topologies
The 1+1 E1 SNCP mechanism described in the previous section can be used to
create protected ring structures in the microwave network. In a ring topology, all
nodes are connected so that two nodes always have two paths between them.
An E1 connection entering a ring at one point and exiting at another point can
therefore be protected with a 1+1 E1 SNCP group configured at each end of
the connection. The traffic is transmitted in both directions of the ring and the
traffic is received from two directions at the termination point.
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/1555-CSH 109 32/1-V1 Uen B 2007-09-14
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