User's Manual

Exalt Installation and Management Guide
EX-i Series (TDD) Digital Microwave Radios
206501-019 55
2016-05-24
• Set the Bandwidth (MHz) parameter to the designed level. The value of this is determined in the
design/engineering stage. The Bandwidth parameter must also match at both ends of the link. In
conjunction with the Mode parameter, the Bandwidth parameter directly relates to the capacity,
latency, and the number of TDM circuits supported. The transmitter and receiver bandwidth are
modified using this parameter, making it critical that it be set with respect to the local RF noise and
interference profile, and/or in relation to any multi-link network design.
• Set the Mode parameter to the designed selection. The value of this setting is determined in the
design/engineering stage. 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 RF Frequency (GHz) parameter to the designed point. The value of this setting is
determined in the design/engineering stage. RF Frequency must match at both ends of the link. It
may be critical to set RF Frequency with respect to the local RF noise and interference profiles,
and/or in relation to any multi-link network design.
The frequency selection section includes the ability to select from either the complete list of
frequencies (“All”) that can be tuned for the selected band and bandwidth, or, in some cases, a pre-
selected list of non-overlapping center frequencies (“Preferred”) that Exalt determined provides
the most flexible collocation opportunities for large networks of Exalt radios
The frequency selection section includes a band selection button that must be enabled for the
frequency band of operation for which the link was engineered. Some bands may not be selectable
due to regulatory constraints. Some bands also require Dynamic Frequency Selection (DFS), based
Note: The link may be lost and unrecoverable through GUI control. If the link is lost due to
reduction of Radio Transmit Power, travel to the radio location(s) may be required to reset the
value.
Note: Changing Bandwidth will temporarily interrupt traffic. The Bandwidth parameter
must match at each end. Adjust the far-end radio first, and then the near-end radio. Changing
Bandwidth changes the radio’s threshold. A narrower bandwidth has better threshold
performance and improved interference immunity, therefore if changing to a wider
bandwidth, there is an opportunity that the link may be lost and unrecoverable through GUI
control. Check the available fade margin and interference profile to determine if the impact to
threshold and increased bandwidth is acceptable to maintain the link and the desired
performance. If the link is lost due to increasing the Bandwidth parameter, travel to the radio
location(s) may be required to reset the value.
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.