Teledyne QMultiFlex-400 Installation And Operating Handbook page 134

QMultiFlex-400™ Installation and Operating Handbook
One-Way: Inbound ACM
HUB Modem
ACM setting: Monitor
All demods report
individual Es/No figure back
to the respective remote
modem according to stream
ID.
Degradation position 1: All remote transmit MODCODS adjust to keep the respective hub
demodulator in lock. Outbound hub carrier is degraded, hopefully within a rain fade margin.
Degradation position 2: One remote transmit adjusts to keep its respective demodulator in
lock. The receive side is degraded, hopefully within a rain fade margin.
ACM & VCM (Bidirectional ACM)
Multiple Tx Streams can be configured in the QMultiFlex-400™ with the remote demod
matching the MODCOD for each stream. Applying ACM will make the VCM links even more
robust, with each individual stream changing to adapt to environmental conditions.
HUB Modem
Multiple Streams Configured.
ACM setting: On
Individual transmit
MODCODs change based on
remote modem Es/No.
All demods report
individual Es/No figure to the
respective remote
according to stream ID.
Degradation position 1: Hub transmit MODCOD changes and reduces throughput for one
or more individual streams if necessary, which ensures system continuity. All remote
transmit MODCODs adjust to keep the respective hub demodulator in lock.
their
1
Figure 8-2 ACM One-Way - Inbound
stream
their
modem
1
Figure 8-4 ACM Bi-Directional with VCM
2
2
8-3
Remote Modems
ACM setting: On
Transmit MODCOD changes
based on HUB demod Es/No
reported.
Stream ID has to match
demod number e.g. Stream
ID 1 for demod 1, ID 2 for
demod 2, etc.
Remote Modems
ACM setting: On
Transmit MODCOD changes
based on HUB demod Es/No
reported. Stream ID has to
match demod number e.g.
Stream ID 1 for Demod 1 etc.
Remote modems reporting
back Es/No information.