MDS 05-6399A01, Rev. F MDS™ Master Station 75
The general specifications for all LN NIC modules are:
Peak Power Output: 20 dBm to 40 dBm peak power in 1.0 dBm steps (DEFAULT = 40 dBm)
Output Impedance: 50 Ohms
Antenna Connector: TNC female
Modulation Type: QPSK, 16QAM, 64QAM
FEC: Convolutional and Reed Solomon
Data Rates: 20kbps - 120kbps
Multiple modulation rate / bandwidth combinations are provided; as seen in Table 5-5.
Table 5-5. Modulation and Bandwidth for LN radios
NOTE The only required steps for basic configuration are: Program transmit and receive frequencies
per user licensing; program a network name in all units; establish one unit as the AP
Minimal configuration is necessary but several advanced tuning facilities are provided.
By default the radio ships from the factory with a 12.5KHz bandwidth and 10k-symbol/sec data
rate. Modem operation is configured for Adaptive Modulation with FEC disabled. Transmit
and Receive frequencies are unprogrammed and left to field installation personnel to prevent
inadvertent operation on the wrong channel.
For the advanced user, the module supports configuring more items including:
Data Retries - Number of times to retry unicast data before declaring NACK.
Power – RF output power control.
ARP Cache – Feature that limits over-the-air ARP traffic
Data and Header Compression – facilities to use LZO data compression for payload and robust
header compression to reduce packet overhead
FEC – facility to selectively enable Forward Error Correction trading off speed and robustness
Allow Retransmit – facility to enable peer-to-peer traffic
In general, it is recommended that users start with the simplest configuration and then make
parameter changes as necessary to meet specific needs.
NOTE To meet country specific regulatory requirements, some parameter restrictions may be
configured by the factory. These settings can NOT be changed or modified by the user.
See Table 6-14. LN Interface LED Descriptions for details on how to interperate the LEDs on
an LN radio.
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