GE MDS ORBIT MCR Technical Manual page 125

Multiple modulation rate / bandwidth combinations are provided; as seen in Table 3-15.
RF
Channel
Bandwidth
6.25 KHz
12.5 KHz
12.5 KHz
25.0KHz
25.0KHz
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:
Country
USA
MDS 05-6632A01, Rev. F
Table 3-15. Modulation and Bandwidth for LN radios
Modem
Symbol
rate
4800 sps
9600 sps
10000 sps
16000 sps
20000 sps
Table 3-16. Country Limitations Example
Limitation
Prohibit LN400 25KHz operation using 20ksps
(Except at 450 MHz – 470 MHz)
Table 3-17. LNxxx Interface LED Descriptions
MDS Orbit MCR/ECR Technical Manual
QPSK 16QAM
(x2) (x4)
OTA rate OTA rate
9600 bps 19200 bps
19200 bps 38400 bps
20000 bps 40000 bps
32000 bps 64000 bps
40000 bps 80000 bps
64QAM
(x6)
OTA rate
28800 bps
57600 bps
60000 bps
96000 bps
120000 bps
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