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 Frequency restriction via Diagnostics
Solution Frequency restriction via Diagnostics

Following describes how to restrict frequency band of 918Mhz-924Mhz for n920T setup at 1.1Mbps link rate in PtP mode. Depending on the link rate, channel width and number of channels available varies. For 1.1Mbps link rate there are 16 channels available, at 1500kHz per channel.

Ch # Starting Freq
1. 903750 kHz
2. 905250 kHz
3. 906750 kHz
4. 908250 kHz
5. 909750 kHz
6. 911250 kHz
7. 912750 kHz
8. 914250 kHz
9. 915750 kHz
10. 917250 kHz
11. 918750 kHz
12. 920250 kHz
13. 921750 kHz
14. 923250 kHz
15. 924750 kHz
16. 926250 kHz

For 918Mhz to 924Mhz restriction, channels 10 to 15 have to be restricted. This leaves 10 free channels.

The offsets calculation is as follows.
Start Frequency
917250-902400=14850 -->> 3A 02 h
End Frequency
924750-902400=22350 -->> 57 4E h

Following settings set up restriction on master unit. For detailed description of diagnostics commands please refer to Diagnostics Manual

Set up restrictions from 917250-924750 Mhz
26 00 01 52 00 00 01 3A 02 57 4E FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
Read back restriction for confirmation
04 00 01 2C 00
Change back number of channels to 10
04 00 01 46 55 0A
Read back number of channels for confirmation
04 00 01 14 55
Save changes
03 00 01 53
Reset modem
03 00 01 FF

Settings for slave unit are identical as for master except unit address is changed to 2

Set up restrictions from 917250-924750 Mhz
26 00 02 52 00 00 01 3A 02 57 4E FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
Read back restriction for confirmation
04 00 02 2C 00
Change back number of channels to 10
04 00 02 46 55 0A
Read back number of channels for confirmation
04 00 02 14 55
Save changes
03 00 02 53
Reset modem
03 00 02 FF


Article Details
Article ID: 3
Created On: 23 Apr 2010 12:36 PM

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