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b.
MPR-e and MSS-1c User Manual 3DB19901EFAA Edition 01
iv.
Select the Modem Profile Option: Current Mask Standard Profile or
New Mask Standard Profile
MPR-E: Current mask standard profile or New mask standard profile
MPR-A: Choose Standard Profile
v.
In the Reference Modulation field, select the Modulation scheme:
MPR-E:
up to 256 QAM for MPT-HC V2, MPT-MC, and MPT-XP
up to 1024QAM for MPT-HC-HQAM (if the compatibility with MPT-
HC box is unchecked)
MPR-A:
up to 256 QAM for MPT-HC V2, MPT-XP, and 9558HC
up to 1024QAM for MPT-HC- HQAM (if the compatibility with MPT-
HC box is unchecked)
vi.
Based on the selected Channel Spacing and the Reference Modulation,
the relevant capacity will appear in the Net Radio Capacity field.
Operation with Adaptive Modulation (ACM)
Adaptive Modulation in a point-to-point system is to adjust the modulation as
well as a range of other system parameters based on the near-instantaneous
channel quality information perceived by the receiver, which is fed back to the
transmitter with the aid of a feedback channel.
The switching between the modulation schemes is hitless and maintains the
same RF channel bandwidth.
To configure Adaptive Modulation:
i.
In the Coding Modulation Type field, select "Adaptive (ACM)".
ii.
In the Channel Spacing field, select the channel spacing.
iii.
For MPT-HC-HQAM only: check the MPT-HC compatibility check box
if needed. If the MPT-HC compatibility check box is checked, MPT-HC
HQAM and MPT-HC can be mixed on both sides of a radio hop.
iv.
Select the Modem Profile Option:
MPR-E: Choose Current mask standard profile or New mask standard
profile
MPR-A: Choose Standard Profile
v.
In the Reference Modulation field, select the reference modulation. For
MPT-HC/HC-HQAM/MC/XP/XP-HQAMP this modulation scheme is
the lowest one.
vi.
In the Allowed Modulation field, select all the modulation schemes to be
used with the Adaptive Modulation. The modulation schemes (from the
lowest to the highest scheme) must be contiguous. Modulation is limited
to 256QAM for MPT-HC, MPT-MC and MPT-XP. For MPT-HC
HQAM/XP-HQAM modulation up to 1024QAM is available if the
Navigator area
(Figure
4.58)
231
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