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QMultiFlex-400™ Installation and Operating Handbook
7.2.2 Point-to-Multipoint Routing .............................................................................. 7-6
Cascading Multiple QMultiFlex-400™ Units ........................................................ 7-8
7.3
7.4
Modem Redundancy Protection ........................................................................ 7-10
7.5
7.6
Multiple Streams and Traffic Shaping ............................................................... 7-13
System Considerations .................................................................... 8-1
8.1
Automatic Uplink Power Control ......................................................................... 8-1
8.1.1 Introduction ..................................................................................................... 8-1
8.1.2 Configuring AUPC .......................................................................................... 8-1
8.2
Adaptive Coding & Modulation (ACM) ................................................................ 8-2
8.2.1 Introduction ..................................................................................................... 8-2
8.2.2 Configuring ACM ............................................................................................ 8-4
8.3
Hub Cancellation ................................................................................................ 8-5
8.3.1 HUB Hardware Configuration .......................................................................... 8-6
8.3.2 Initial Configuration ......................................................................................... 8-7
8.3.2.1
Hub Modem Configuration ...................................................................... 8-8
8.3.2.2
Remote Modem Configuration ................................................................ 8-8
8.3.3 Initial Measurements ....................................................................................... 8-9
8.3.3.1
Initial Performance Measurements, Hub Canceller Disabled ................... 8-9
8.3.4 Canceller Operation ...................................................................................... 8-11
8.3.4.1
Enable Hub Outbound Carrier and Canceller ........................................ 8-12
8.3.4.2
Hub Canceller Configuration ................................................................. 8-12
8.3.4.3
Lab Configuration .................................................................................. 8-13
8.3.4.4
Paired Carrier Enable ............................................................................ 8-13
8.3.5 Summary ...................................................................................................... 8-18
8.3.6 Troubleshooting Guide.................................................................................. 8-19
8.3.6.1
Why Can I Not Enable the Hub Canceller? ........................................... 8-19
8.3.6.2
Why Does The Hub Canceller Not Lock? .............................................. 8-20
8.3.6.3
Why does the Hub Canceller Lose Lock after Acquiring? ...................... 8-21
8.3.6.4
Why does the Hub Canceller Es/No Seem Unstable? ........................... 8-23
8.3.6.5
Why is the Es/No Worse when the Hub Canceller is enabled? .............. 8-24
8.3.6.6
RTD Optimisation .................................................................................. 8-24
8.3.6.7
Hub Canceller vs No. of Rx channels .................................................... 8-24
8.4
1:1 Redundancy Operation ............................................................................... 8-25
8.4.1 Overview....................................................................................................... 8-25
8.4.2 Switching Operation ...................................................................................... 8-27
8.4.3 Setup Procedure ........................................................................................... 8-27
8.4.4 IP Addressing and Operation in Redundancy Configurations ........................ 8-28
8.4.4.1
1:1 IP Operation .................................................................................... 8-28
8.4.4.2
1:N IP Operation ................................................................................... 8-28
8.5
Geo Redundancy Operation ............................................................................. 8-29
8.5.1 Geo Redundancy Overview .......................................................................... 8-29
8.5.2 Geographical Redundancy Integration with 1:1 redundancy ......................... 8-30
8.5.3 Geographical Redundancy Hub Failure Modes ............................................. 8-30
8.5.4 Start-up condition .......................................................................................... 8-34
8.5.5 IP Messaging ................................................................................................ 8-34
8.5.6 Restrictions ................................................................................................... 8-34
8.6
Software Activated Features ............................................................................. 8-35
8.7
IP Functionality ................................................................................................. 8-36
8.7.1 Base Modem IP & IP processing card ........................................................... 8-36
8.7.2 IP Addressing ............................................................................................... 8-36
8.7.2.1
Gateways .............................................................................................. 8-37
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