User's Manual

Elpro Technologies 450U-E Wireless Ethernet Modem & Device Server User Manual
20 www.cooperbussmann.com/wirelessresources Rev Version 1.4.0
Radio Operating Parameters 3.1
Frequency Bands
The radios will operate within the range 360-512MHz; however the radio must be factory set to one of the 20MHz
frequency bands shown below. Care must be taken when ordering to select the correct band for your locale as the
frequency cannot be configured outside of its band.
The following Frequency bands are available.
370
360 380 MHz
390
380 400 MHz
410
400 420 MHz
430
420 440 MHz
440
430 450 MHz
460
450 470 MHz
480
470 490 MHz
500
490 512 MHz
Note: Modems must be ordered to operate in the chosen band; modems cannot be tuned to a
frequency that is outside of this band.
Data Rate
The 450U-E can be configured with different radio transmission rates. Selections available are 9600 and 19200 bps for
wide band radios or 4800 & 9600 bps for narrow band. The Data Rate only applies to transmit messages as the radio is
able to receive on all available data rates.
Reducing the data rate can increase the reliable communication range of the module, i.e. if the received signal level is a
little low, the data rate could be reduced to improve the communications.
It is important that the Data Rates on the Client radios be configured appropriately for the radio link. The default Data Rate
will be set to the high level depending on the bandwidth, i.e. 19.2kbps if the radio is wide band (25 KHz) and 9.6kbps if
the radio is narrow band (12.5 KHz). If the signal strength (RSSI) for the radio is les than -100dBm for narrow band and -
110dBm for wide band radios it is recommended that the Radio Data Rate is reduced to the lower rate. The Receiver
Signal Strength Indication (RSSI) can be viewed on the Connectivity page (see Section 4.1 Connectivity for details)
When an Access Point first communicates with a Client it remembers what data rate it is using and
from then on will communicate at that rate. All UDP broadcast traffic and beacon messages for the
will use the lowest date rate from all the modules in the system.
Receiver
The Radio Receive Sensitivity will vary depending on the radio channel width, whether it is a wide band radio using 25
KHz channels or if it a narrow band radio using 12.5 KHz channel. The transmit data rate will also vary the receiver
sensitivity. Refer to the table below for Receiver Sensitivity
Receiver Sensitivity
Baud Rate
Bandwidth
4.8kbits
9.6kbits
19.2kbits
25KHz Channel
N/A
-110 dBm
-99 dBm
12.5 KHz Channels
-111 dBm
-100 dBm
N/A