User guide
39
Wireless I/O Extender User’s Guide
PN 161-09981-007A
January 2010
Menu (4): Show Radio Statistics
Number of Disconnects
The value records the number of times the radio has lost the RF link and re-establishes a link. The value indicates the
total number of disconnects that have occurred from the time the transceiver is powered on until the radio is put into Setup
mode. Under ideal operating conditions, the number of disconnects should be 0. One or more disconnects may indicate a
weak link, the presence of severe interference problems or loss of power to any of the radios in the link.
Radio Temperature
The Radio Temperature value is the current operating temperature of the transceiver in degrees Celsius. For proper
operation, a radio must be in the temperature range of -40° to +75° C.
Antenna Reflected Power
This is a measurement of the transmitted power that is reected back into the transceiver from mismatched antennas or
cables, or loose connections between the transceiver and antenna. A reading of 0-5 is good and 5-30 is acceptable, but a
30+ number would indicate that the connections from the radio to the antenna should be inspected for a loose connection
and the cable quality checked.
Transmit Current (mA)
This measures the current draw of the transmitter in milliamps. Refer to the radio model specs for typical values.
Average Noise Level
The average noise level indicates the level of background noise and interference at this radio and at each of the radios
used as repeaters in the link.
The average noise levels will typically fall in the range of 15 to 35 “J”, and the noise levels should be below 70 “J”. Higher
noise levels are an indication of a high level of interference that may degrade the performance of the link. High noise
levels can often be improved with:
•The addition of a bandpass lter for out-of-band noise
•Relocation of the antenna or antenna polarization.
•Proper antenna and equipment grounding
Average Signal Level
The average signal level indicates the level of received signal strength at this radio and each repeater in the link. For each
of these, the signal source is the radio that transmits to it.
Low Average Signal Levels can often improved with:
•Using higher gain antennas or directional instead of omni
•The relocation of the antenna to improve the line of site
•The use of repeaters
The signal and noise number is an average of the received levels measured at each frequency in the radio’s frequency
hop table. The individual measurement values at each frequency hop channel are shown in the frequency table. The
frequency table is accessed by pressing the ENTER key on the computer when in the Show Radio Statistics menu.
For a reliable link, the margin or delta between the signal and noise should be at least 26 “J” units.
Overall Rcv Rate (%)
The Overall Rcv Rate measures the percentage of data packets that were successfully transmitted from the master to the
remote on the rst attempt without requiring retransmission.
A number of 75 or higher indicates a robust link that will provide very good performance even at high data transmission
rates. A number of 25 or lower indicates a weak or marginal link that will provide lower data throughput. An Overall