Chapter 3. 9500 MXC Nodes
Vol. II-3-76 Alcatel-Lucent
• Equal-split has a nominal 3.5/3.5 dB loss per side.
• Unequal-split has a nominal 1.6 /6.4 dB insertion loss.
For more information on coupler losses, refer to Coupler Losses on page 7-19,
Volume IV, Chapter 7.
Dual Protection
Dual protection enables master protection of two subordinate protected links, or
one protected link with one non-protected link.
The dual protection options are:
• Frequency diversity over hot-standby
• Frequency diversity over space diversity
Table 3-28 summarizes the dual link protection options; two protected
subordinate links are in turn protected by a higher, frequency diversity master.
All RACs (RAC 30 or RAC 3X) must be located in the same INUe. Except for
the Space Diversity pairings where two vertically separated antennas are
required, a single dual-polarized antenna can be used.
Table 3-28. Dual Protection Options
Figure 3-46 illustrates the action of a frequency diversity master with
subordinated space diversity links.
• The two space diversity links are on different frequencies, F1/F1’and F2/F2’
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.
• Both space diversity links are online transmitting.
• At any one time only one of the space diversity links is sending received data
to the INUe backplane bus.
• Master protection controls which of the two space diversity links is sending data
to the INUe backplane bus; default the secondary link under master (frequency
diversity) configuration.
Master Protection Subordinate Protected Link Pairings
Link A Link B
Frequency Diversity Hot Standby Hot Standby
Hot Standby Non-protected
Space Diversity Space Diversity
Space Diversity Non-protected
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F1/F1’ and F2/F2’ denotes Tx high and Tx low and its corresponding Rx.
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