User's Manual

Page 43
E Series Ethernet Radio – User Manual
Version 08-10
Part G – Commissioning
Check DC power connector for correct voltage (10-30VDC for
ER45e and 11-16VDC for EB45e and EH45e) and polarity,
BEFORE plugging in the power connector.
Power-up
Upon power up, the radio will self test and shortly after the green
power LED will be displayed.
Failure of the power LED to light indicates no power, or failure of
the fuse due to incorrect polarity or over-voltage. Or you may have
the System port of the unit plugged into your network, this will
cause the radio to go into shutdown mode.
Other failure such as fatal internal errors will initiate error modes
as detailed in Part E - Getting Started: LED Indicators and Test
Outputs.
LED Indicators
Will depend on the system architecture. If the device is a remote
site receiving a base station with a constant carrier, then the
RXSIG/SYNC LED should be green to indicate healthy reception of
the wanted signal.
If the site has been congured as a constantly transmitting base
station, then the PWR/TX LED should show red.
In other types of systems, TX and RX bursts would be indicated by
the RX or TX LED’s as above.
Data ow to and from the data port is indicated by the TXD/RXD
LED for the data port.
The “Active/Link” LED is used to indicate the state of the LAN port.
(See Part E – Getting Started: LED Indicators and Test Outputs.)
Data Transfer Indications
Bi-colour LEDs are provided to indicate RS232 data being
transmitted and received on the data port. A RED ash indicates
a byte (or bytes) of incoming data from the serial line which will
be transmitted to air, and a green ash indicates a byte of data
received “off air” being released onto the serial line.
If data is being sent to the radio modem and the Data LED does
not ash RED, this may indicate a wiring or conguration problem.
Check that the TX and RX data lines are correctly wired (see Part
E – Getting Started: LED Indicators and Test Outputs).
Also check that character set and parity settings (i.e. N,8,1 etc) are
set identically at the terminal and the radio modem. Note that some
incorrect settings of the character set parameter can still produce
transmittable data, even though the data will not be understood by
the application.
The “Active/Link” LED is used to indicate the state of the LAN
port. If the LED is OFF, there is no activity at all on the LAN port. A
GREEN indication shows an established Ethernet link. The LED will
ash AMBER to indicate Ethernet data transmission is occurring.
Antenna Alignment and RSSI
Testing
Once the RXSIG LED is lit, it is possible to conrm RX signal
strength and align a directional antenna by monitoring the RSSI
output.
This DC voltage appears at Pin 9 of Port B.
A ground reference can be obtained from chassis ground or Pin 5
of Port A or B.
The chart below shows Pin 9 voltage as it relates to signal
strength.
Part G – Commissioning
Link Establishment and BER
Testing
Once communications has been established, it is possible to
conrm the packet error rate performance of the radio path, and
thus estimate the BER gure.
There are a number of tools provided to do this. The easiest is to
use the “indicative packet error test” provided within the TVIEW+
Diagnostics under “statistical performance tools”. Alternatively, it is
possible to use hyper terminal, or other packet test instruments or
PC programs to run end to end or perform “loopback” testing.
Please note that when using a “loopback plug” some
understanding of the packetising process is necessary, since each
“test message’ must be carried in a single packet for meaningful
results to be obtained.
Note also that in PTMP systems, allowance must be made for
collision potential if other data is being exchanged on the system.
VSWR Testing
VSWR testing is achieved using specialized VSWR testing
equipment, or a “Thruline” power meter that measures forward and
reverse power.
VSWR is the ratio between forward and reected transmitter
power, and indicates the health and tuning of the antenna and
feeder system.
VSWR should be better than 2 to 1, or expressed as a power ratio,
<6dB or no more than 25%. To activate the radio’s transmitter for
VSWR testing, use:
a) An RTS loop
b) A system port PTT plug with pins 7&8 shorted.
Analog RSSI Output Characteristics - E Series Data Radio
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
-120 -110 -100 -90 -80 -70 -60 -50 -40
RF Level (dBm)
RSSI (DC Volts)