Maintenance M7/M7L/M7LT Modular Satellite Modem
3-104 M7/M7L/M7LT - Rev. 0.05
3.10.2.1. AUPC Local Mode Setup Guide
Assume a working link between A and any number of sites (N) without any multiplexers or AUPC
enabled and an minimum operating link performance at the remotes of 7.0 dB Eb/No. The AUPC
Local setup simply requires setting up the AUPC parameters in the Site A transmitting modem (the
Hub). No changes are required at any of the remote sites
Figure 3-53 shows a PtMP hub modulator with the optional AUPC demodulator installed that will
monitor the local transmit carrier Eb/No performance and adjust the local transmit power to maintain a
set Eb/No level.
Mod
IF AUPC Mode = Enabled
Unit
IP Control Address = 192.168.1.100
Dmd (option for AUPC)
IF AUPC Remote Path =
Local
Intf
MCC Send Address = 0
MCC Rcv Address = 0
Hub Modulator
E7
Eth
I/O
P1
P2
P3
P4
P5
Broadcast Carrier
Broadcast Carrier from Satellite
Figure 3-53 – Hub Modulator with optional AUPC Demodulator
3.10.2.1.1. Site A AUPC Local Setup
1. Determine the current receive Eb/No at a sampling of the remote sites during clear sky
condition.
2. Read Site A Eb/No.
3. Set the < Mod: IF - AUPC Mode> parameter to “Enabled.
4. Set the < Mod: IF - AUPC Eb/No> parameter to that desired value, e.g. 9.0 dB.
5. Set the < Mod: IF - AUPC Max Level> parameter to the desired level. Determine the value
for this parameter by calculating the maximum power that is allowed to prevent the link from
saturation but should be several dB above the nominal operating point for margin.
6. Set the < Mod: IF - AUPC Min Level> parameter to the desired level. Determine the value
for this parameter by calculating the minimum power that is allowed to prevent the link from
dropping below the operating threshold but should be several dB below the nominal
operating point for margin.
7. Set the <Demod: IF - AUPC Send Path> parameter to “Local”.
The link should now be operating and using AUPC to set the A hub transmit level keeping its own
receive Eb/No constant and therefore the (N) remote sites receive Eb/No almost constant. Alarms will
be generated if the transmit level reaches either the max or min level attempting to maintain the
receive E/b/No.
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