MDS 05-6632A01, Rev. F MDS Orbit MCR/ECR Technical Manual 125
Multiple modulation rate / bandwidth combinations are provided; as seen in Table 3-15.
Table 3-15. 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 enabled. Transmit and Receive
frequencies are unprogrammed and left to field installation personel to prevent inadvertant 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, parameter restrictions may be configured by
the factory. These settings can NOT be changed or modified by the user. See the table above:
Table 3-16. Country Limitations Example
Prohibit LN400 25KHz operation using 20ksps
(Except at 450 MHz – 470 MHz)
Table 3-17. LNxxx Interface LED Descriptions
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