4.3. Link test
Verify the functionality of the radio link. Switch in screen Status - Brief:
•
Status Bar displays
Link: Ok
.
If the alarm message appears at Local or Peer, this doesn’t necessarily mean there is a problem.
The message indicates that the limit at any of the monitored parameters has been exceeded. Es-
sential is the
Link: Ok
message.
•
The
Status
screen contains values for both Local and Peer units. N/A next to Peer indicates that
the data from the Peer unit has not been transferred. If
Link
is
Ok
, simply click Refresh at the bottom
of the screen and Peer data will be updated.
•
Menu
Status – Detailed – Radio
indicates link RSS and SNR values, in case of ACM also the selected
modulation and Netbitrate. If the ATPC function is enabled (menu
Settings – Radio
) it also indic-
ates instantaneous / max. allowed power and for SNR and RSS values it indicates immediate /
target value size.
•
Menu
Tools – Graphics – Bar indicators
display current size of RSS, SNR and BER.
•
Menu
Tools – Ping
allows you to send a ping test to the selected IP address.
Try out the possibility of modulation:
•
Modulation ACM. In menu
Settings – Radio
enable ACM. Set the TX modulation parameter to the
required maximum value. In menu
Status – Brief – Radio
you can monitor (Refresh or Start) changes
in used modulation based on the instantaneous SNR signal quality. Status and quality of modulation
is demonstrated well in menu
Tools – Graphics – RX constellation diagram
, hit Refresh.
•
To set a fixed modulation go to
Settings - Radio
, switch off ACM and set the TX modulation to a
value from the range of QPSK through 256-QAM based on the results of the previous test. If you
choose modulation higher than allowed by SNR, the connection will be lost.
Status Link
will lose its
Ok
value. Both units will need to be moved closer to resume the link. If this is not possible, use
ethernet to access each unit individually and set the basic modulation QPSK. You can monitor the
quality of the received signal under
Tools – Graphics – RX constellation diagram
.
Verify the functionality of the entire link:
•
If possible, connect user devices to both RAy units over PoE and test mutual communication.
•
Another way of testing this is to connect a PC to the other unit and send a ping from one PC to the
other.
•
The minimum variant of this test is to use ethernet cable connection from the PC connected to the
local RAy to the PC connected to the remote RAy and test communication between both units over
ethernet. This will verify ethernet functionality.
Prepare installation configuration:
•
Bandwidth e.g. 3.5 MHz. To get the highest possible receiver sensitivity, set the bandwidth as narrow
as possible according to specific frequency band.
•
TX channel: Use your allocated channel. If you don't have allocated channel yet, use for example
channel L1.
•
RX channel will setup automatically when channel lock activates.
•
TX modulation QPSK to get the highest possible sensitivity.
•
RF power according to selected antenna and according to individual frequency licence. Set the
output power as high as possible.
•
Record the access parameters from the Service access menu, especially the IP addresses.
33
© RACOM s.r.o. – RAy Microwave Link
Step-by-step Guide