Comtech EF Data MM200 - Manual (Page 22)

Theory of Operation MM200 High-Speed Microwave Modem
3-4 TM086 - Rev. 4.1
6.
Modem should lock with SNRs > 32 dB.
3.2.2 Sample Setups
3.2.2.1 Transmitting G.703 T3 From Interface Slot 3 (other interfaces
disabled) Sample Setup
1.
In System, User Mode, set to ‘Level 2’.
2.
In Modulator, set the frequency to ’70 MHz’.
3.
In Tx Interface 3, set Control to ‘Enable’ (ensure all other interfaces are disabled).
4.
Set Interface to ‘T3’.
5.
Set Data Inv to ‘Norm’.
6.
Set Bandwidth in the Modulator Menu to ‘30,000,000’.
7.
Set the Demodulator to a frequency of ‘70 MHz’.
8.
In Rx Interface 3, set Control to ‘Enable’ (ensure all other interfaces are disabled).
9.
Set Interface to ‘T3’.
10.
Set Data Inv to ‘Norm’.
11.
Set the bandwidth in the Demodulator Menu to ‘30,000,000’.
3.2.2.2 Transmitting STM-1 From Interface Slot 1 (other interfaces
disabled) Sample Setup
1.
In System, User Mode, set to ‘Level 2’.
2.
In Modulator, set the frequency to ’70 MHz’.
3.
In Tx Interface 1, set Control to ‘Enable’ (ensure all other interfaces are disabled).
4.
Set Interface to ‘STM-1’.
5.
Set Data Inv to ‘Norm’.
6.
Set the bandwidth in the Modulator Menu to ‘30,000,000’.
7.
Set the Demodulator to a frequency of 70 MHz.
8.
In Rx Interface 1, set Control to ‘Enable’ (ensure all other interfaces are disabled).
9.
Set Interface to ‘STM-1’.
10.
Set Data Inv to ‘Norm’.
11.
Set the Bandwidth in the Demodulator Menu to ‘30,000,000’.
3.2.3 Hardware Reset