Alcatel-Lucent 9500 MXC - Page 179

9500 MXC User Manual
3DB 23063 ADAA - Rev 004 July 2007 Vol. II-3-85
• The path supported by a 1+1 link exhibits a path fail condition. The path
failure switching criteria are the standard ring path failure criteria, with the
exception of the 10
-6
BER option
8
. Refer to Radio Wrap Conditions on
page 3-98.
• The 1+1 link triggers an online Rx and/or Tx switch event. Refer to
Hot-standby and Diversity Switching Criteria on page 3-93.
• The 1+1 link triggers a demodulator not locked alarm on both RACs.
• The decision to unwrap is made when the ring error-free timer times out and, if
set, the time of day timer. Refer to Unwrap Timers on page 3-99.
• Ring wrap and unwrap times for 1+1 ring links are identical to 1+0 ring links.
Refer to Wrap and Unwrap Times on page 3-99.
• Event Browser entries are created for switch events on the ring and subordinate
space diversity link(s).
Figure 3-52 illustrates the protection management hierarchy where both east and
west links on a Node are space diversity.
Figure 3-53 illustrates the heirachy where one ring link is space diversity, and the
other 1+0.
Figure 3-52. Switch Management Heirachy: SD + SD Subordinated Links
Figure 3-53. Switch Management Heirachy: SD + 1+0 Link
8
For 1+1 ring links the 10
-6
BER ring wrap/unwrap option is not supported.
RING
Space
Diversity
Space
Diversity
RAC
RAC RAC RAC
RING
Space
Diversity
RAC
RAC
RAC