W900iTR User Guide
1-15
1.8 Technical Specifications
RF transmission rate
1.536 Mb/s
Ethernet throughput
935 Kb/s
Output power
+21 dBm (4 Watts EIRP used with 15 dBi antennae)
Receive sensitivity
-97 dBm at 10e-4 BER (-112 dBm with 15 dBi antennae)
Radio link budget
148 dB with 15 dBi antennae
Range
50 miles LOS with 15 dBi antenna
Radio channels/bandwidth
12 non-overlapping with 2.0833 MHz spacing and 1.75 MHz occupied bandwidth
Automatic Frequency Select
Yes, radio channel automatically selected and adaptively optimized
Manual frequency select
Yes, channel selected with DIP switch
Connector types
RF RPTNC Female / Ethernet RJ45 10BaseT / Power Jack 3pos, 5mm
Status LEDs
Power, Ethernet Link, RF RX, RF TX, 4/Channel, and 6/Link Quality
Error correction technique
Sub-block error detection and retransmission
Adjacent-band rejection
SAW receiver filter attenuates cellular and pager interference
Power consumption
Transmit: 1.9 W, Receive: 1.2 W
Voltage
24 VDC
Temperature range
-40° C to 70° C
Transmit current draw
75 mA
Size
1.5”W x 4”H x 3”D
1.9 Old Method
W900iMTR radios use electronic network keys that allow the user to group radios together to form a
network. Network keys are shared between radios by connecting an Ethernet cable between the RJ45 ports
while the radios are in "key exchange mode" (radios that are in "key exchange mode" display the 6 LINK
QUALITY LEDs blinking sequentially back and forth).
To share the keys and to create the network, the user first selects which radio will be the access point (AP)
by setting DIP switch 1 ON (see Switch Settings on page 1-8). The other radios will function as subscriber
units (SUs) and do not require any DIP settings. The user then connects an Ethernet cable from the AP to
each SU to transfer the network keys. Key exchange will not work through a switch or hub. Once the key
sharing is complete the AP and SU change their LED displays in confirmation of the successful
programming:
The- SU blinks one of the GREEN LINK QUALITY LEDs •
The AP illuminates the LED labeled RF RX and the AP remains in "key exchange mode."
If the user's needs change, additional SUs can be added to the network and/or a SU can be reprogrammed to
join a different network and/or a SU can be changed into an AP and/or an AP into a SU. The radios cannot
be damaged by incorrect programming. If DIP 1 is accidentally toggled then DIP 1 can be turned back and
the radio still retains all the network associations it had in its previous mode (assuming that the radio had not
yet successfully key exchanged with a new network). An AP can be reset by programming it as a SU to a
new AP and then turning it back into an AP again.
SUs that have not yet received a network key boot up in "'key exchange mode" and wait to receive a key.
SUs that have received a network key will boot up for 5 seconds in "key exchange mode" and will look to
see if a new AP is present. If a new AP is present, then the SU exchanges keys with the AP, otherwise the
SU begins normal operation after the 5 seconds.
APs that have not yet issued network keys boot up in "key exchange mode" until they have issued network
keys to at least 1 SU. Once the AP has issued keys it will only boot up for 5 seconds in "key exchange
mode." If a SU is present during the 5 seconds, then the AP will issue new keys to the SU and will then
