Banner MultiHop Product Manual - page 12
dio’s device address is displayed
under its *RUN menu).
Single click button 1 to scroll be-
tween all the master radio’s chil-
dren. When you reach the child ra-
dio you want to run the site survey
with, single-click button 2.
Single-click button 2 to select PARENT or
CHLDRN.
If conducting the site survey with one of the re-
peater’s children, single-click button 1 to scroll
among a repeater’s children radios. (Each da-
ta radio’s device address is displayed under its
*RUN menu.)
Single-click button 2 at the device address
screen to select the child or parent and begin
the site survey.
Single-click button 2 to begin the site
survey.
The site survey begins. LED 2 on both the parent and child radios flash for every received RF packet. To indicate the parent
is in site survey mode, LED 1 is a solid green. The data radio analyzes the quality of the signal between the parent and child
by counting the number of data packets received and measuring the signal strength (green, yellow, and red).
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Examine reception readings (G, Y, R, M) of the devices at various locations. M displays the percent of missed packets while
G, Y, and R display the percent of received packets at those signal strengths. These values are continuously updated as long
as the site survey is running.
GRN = GREEN excellent signal strength; YEL = YELLOW good signal strength; RED = RED marginal signal strength; MIS =
Percentage of missed packets. When possible, install all devices to optimize the percentage of YELLOW and GREEN data
packets received.
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While the site survey is in process, single-click button 2 to pause or resume autoscrolling the site survey results. While
paused, button 1 single-step advances through the four signal strength categories: green, yellow, red, and missed. Double-
click button 2 to exit the results display.
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Double-click button 2 on either the child or the parent device.
Site survey ends and the devices automatically resume operation.
Interpreting the MultiHop Site Survey Results
Site survey mode works by having two radios (one child and one parent) repeatedly exchange data packets. For every round-trip ex-
change of data, the child data radio keeps track of the weaker of the two paths. Both units report the statistics as a percentage on their
LCD display.
The reports consists of sorting the data into one of four categories: Green, Yellow, Red, or Missed Packets.
• Green indicates strong signal,
• Yellow is less strong but still robust,
• Red means the packet was received but has a margin of less than 15 dB, and
• A missed packet means the data did not arrive or contained a checksum error. (During normal operation, missed packets are re-tried
until they are received without errors. During a site survey, missed packets are not re-tried.)
For applications with only a few hops, the system can tolerate up to 40% missed packets without serious degradation, but situations with
more missed packets should be reviewed for proper antenna selection and placement, cabling, and transmit power levels. If your applica-
tion includes many hops, modify the installation and antenna placement to reduce the missed packet count.
Any radio can initiate a site survey. Other radios on the same network ID remain synchronized to the network, but are blocked from
sending data while the site survey is running. In installations with multiple child radios, the site survey analyzes the signal strength be-
tween the selected child and its parent radio only. Disable site survey on one radio before initiating it from another.
Radios in site survey mode have a solid green LED for the duration of the site survey and the LCD display scrolls the results. Because
the statistics represent the lesser of the round-trip results, one person can ascertain the link quality from either device.
Installing Your SureCross™ Radios
The following are some recommendations for installing your wireless network components.
MultiHop Radio Product Manual
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