Protection Settings - Alcatel-Lucent 9500 MXC User Manual

Chapter 7. Node and Terminal Plug-ins

Protection Settings

Vol. IV-7-18
Item Description
6 Enter the polarization and location of the protected co-channel partner RAC
40s.
For the Node, the displayed options depend on the protection type selected in the
Protection screen.
For protected Terminals, the Plug-ins screen does not indicate protection
settings. Each Terminal (primary and secondary) is separately configured.
Within a Node Plug-ins screen the Protection Settings panel provides:
• Confirmation of the protection type selected in the Protection screen.
• For hot-standby and frequency diversity (single antenna operation), a
Coupler Loss menu for user entry of the loss values for primary and
secondary plug-ins (RACs). The entered losses are purely informational;
they do not offset Tx power and RSL indications. Coupler losses must
therefore be manually accounted for in the calculation of effective radiated
power and of receive signal level for fade margin purposes.
Two types of coupler are provided; an equal split coupler with insertion
losses of nominally 3.5 dB per side, and an unequal split coupler, which has
a nominal split of 1.5 / 6.5 dB. Refer to Table 7-4 on page 7-19 for details of
the losses by frequency band for the equal and unequal options.
For the unequal split coupler, the low-loss side must be assigned to the
primary RAC. (The primary RAC must be the RAC/ODU combination
connected to the primary arm of the coupler)
Loss figures can be entered directly or by using the up-down tabs.
The losses apply for Tx and Rx. For instance, if the primary side has an
insertion loss of 1.6 dB, then the total additional primary-primary path loss
due to the coupler at each end of the link will be 3.2 dB.
• For a hot-standby, co-channel link (protected RAC 40 operation), a panel
will appear prompting entry for polarization and locations of the partner
co-channel RACs. The entered data is purely informational; it does not
impact operation.
For protected co-channel operation:
- ATPC must not be used.
- An equal-loss coupler must be used.
- The co-channel RACs must be set for the same capacity and modulation.
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