User's Manual

Exalt Installation and Management Guide
ExtendAir G2 24GHz Digital Microwave Radios
209866-002 41
2015-09-09
• ACM Target Modulation parameter sets the desired modulation for the link under normal unfaded
conditions. The radio attempts to remain in mode at all times, unless link conditions cannot
support it. Again, licensing and/or local regulations may govern the maximum setting for this
parameter.
• Set the Mode parameter to the designed selection. The value of this setting is determined in the
design/engineering stage and by the licensing process. The Mode parameter must match at both
ends of the link. In conjunction with the Bandwidth parameter, the Mode parameter setting directly
relates to the capacity of the system, as well as critical RF parameters, including receiver
threshold, carrier-to-interference ratio, and in some cases, maximum radio transmit power.
• Set the TX Frequency (GHz) parameter and Rx Frequency (GHz) parameter to the center
frequencies. The frequencies must match the same pair at both ends of the link, but in opposite Tx/
Rx orientation.
• The Transmitter/Receiver (TR) frequency spacing is automatically determined based on the
frequency settings and configured bandwidth in MHz. This is reported to verify the intended
frequency settings, as a confirmation to proper input.
• Buzzer Timeout (minutes) parameter creates an audio signal for antenna alignment. Turn on the
buzzer continuously during antenna alignment or preset a period of time that the buzzer will
sound. If the buzzer stops before alignment activities are complete, change the selection and press
the Update button or select the ON option until alignment activities are complete.
• Full-Duplex Throughput parameter provides information about user capacity of the wireless link,
in the current configuration. The ‘new value’ column reflects throughput if changes are made to
Bandwidth or Mode. Click the “Full-Duplex User Throughput” link for details on how capacity
information is determined.
Note: Changing Mode will temporarily interrupt traffic. The Mode setting must match at
each end. Adjust the far-end radio first, and then the near-end radio. Changing Mode changes
the radio’s threshold, carrier-to-interference ratio, and also may have impact on the Radio
Transmit Power. A lower mode has better threshold performance and carrier-to-interference
ratio, and in some cases, higher output power, therefore if changing to a higher mode (for
example, from Mode 1 to Mode 2), there is an opportunity that the link may be lost and
unrecoverable through GUI control. Check the available fade margin and interference profile,
and determine if the impact to RF performance is sufficient to maintain the link and desired
performance. If the link is lost due to increasing the Mode parameter, travel to the radio
location(s) may be required to reset the value.
Note: Changing RF Frequency will temporarily interrupt traffic. The RF Frequency
parameter pair must be opposite at each end. Adjust the far-end radio first, and then the
near-end radio. If the link is lost due to changing the RF Frequency parameter, travel to the
radio location(s) may be required to reset the value.