Trango Systems, Inc. GigaPlus User Manual Rev 3.1 120
The two steps above must be done on both ends of the link, starting with the unit that
does not have output band management or which relies on the GigaPlus IBM
connection for management
Step 6: Set the Speed and Modulation
The speed setting may require a license key if the resulting payload speed is above 100
Mbps. The command speed shows the current modulation, Bandwidth in MHz, Symbol
Rate in Msym/sec, and the payload speed (capacity) in Mbps.
(CLI-config)# speed
Modulation: 128QAM
Bandwidth: 20.00
Symrate: 17.42
Speed: 111.00
Step 7: Enable the Transmitters
Turn opmode on on both ends of the link. This enables the transmitter on the unit.
After the opmode is turned on, the TX frequency cannot be changed unless opmode is
turned off again.
(CLI-config)# opmode on
Opmode: on
SUCCESS
Step 8: Verify the link is working
Run the linktest command to confirm that the link is running properly after enabling
ACM. Notice that the Tx and Rx modulation levels are now shown. Now, if the link
conditions degrade due to rain fading, either the Tx or Rx may downshift during the fade
event. Running the linktest command again will show the lower modulation such as
64QAM, 32QAM, etc. for Tx or Rx. The RSSI will also likely change for rain fading, but
may remain unchanged if the link degradation is due to multipath. The modulation/RSSI
will automatically return to the set value once the fading condition has passed.
(CLI-config)# linktest
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