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Page 66
J-Series Data Radio – User Manual
Issue 09-10
Commissioning
When commissioning an Ethernet radio network, it is important
to ensure that the incoming received signal strength (RSSI) is
adequate to provide reliable communications.
In order for a system to operate reliably, an “adequate” signal level
must be present which allows for fading and interference.
An adequate level is typically 25 to 30dB above the minimum
threshold of the receiving device.
Should this level not be achieved, then either;
1. A more suitable location must be found to mount the antenna.
2. The antenna will need to be mounted higher in a more prominent
location to achieve as close as possible to clear line of site.
3. An alternate Access Point site must be used to achieve
communications or as a last resort.
4. The RF Data Speed should be lowered to 256k to increase the
sensitivity of the radio.
5. The Data Re-transmissions and No Ack Re-Try limit should be
increased to improve the reliability of the Ethernet radio link.
HTML Diagnostics
Overview
After the J-Series radios have been configured and installed,
the next most important step in the commissioning process is to
review the HTML diagnostics which is available in every radio. The
diagnostics that is available is shown in the image below and is as
follows:
Unit Specific:
Date: Specifies the current date and time. For the date and
time to be correct the radio must be configured to
synchronise with a NTP Time Server.
CPU Load: Specifies the amount of CPU load the linux based
kernel is experiencing.
Network Specific:
LAN 1 Rx Packets: The number of Ethernet packets received
on LAN1.
LAN 1 Rx Bytes: The number of bytes received on LAN1.
LAN 1 Tx Packets: The number of Ethernet packets
transmitted on LAN1.
LAN 1 Tx Bytes: The number of Ethernet packets received
on LAN1.
(the same applies for LAN2)
Radio Specific:
Radio Rx Packets: The number of packets received by the
radio.
Radio Rx Bytes: The number of bytes received by the radio.
Radio Tx Packets : The number of packets
transmitted by the radio.
Radio Tx Bytes: The number of bytes transmitted by the
radio.
Radio Reverse Power (dBm) : TX Reverse power measured
in dBm.
Radio Forward Power (dBm): TX Forward power measured in
dBm.
Radio RSSI (dBm): The RSSI (Received Signal Strentgh
Indicator) measured in dBm.
Supply Volts: The DC supply voltage measured in dBm.
Radio Temperature (C): The internal radio temperature
measured in degrees Celsius.
Radio Synched: Displays the status of the radio modem being
in synchronisation with an Access Point (Yes or No)
Lost Sync Count: The number of times a radio has lost
synchronisation with an Access Point.
Failed Tokens: The number of failed token attempts (see
description of Digital Collision Avoidance in Part D of
this User Manual)
Retired Packets: The number of packets that were sent but for
which an acknowledgement from the Access Point
was never received.
Failed Packets: The number of incoming packets that have
failed CRC check and have been discarded.
Part H – Installation & Commissioning