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COM3000 Integrator’s Installation Manual
5 INSTALLATION
5.1 SATELLITE SIGNAL INPUT
COM51 Card requires two inputs from a digital SWiM 30 as part of a DirecTV approved MFH2 trunk.
Input signal levels must be between -30 and -45dBm with SnR >11.
All signals should be verified with a DirecTV Advanced Installation Meter EIV+ test.
Attenuation
If the cable distance between the COM51 cards and the SSWIM30 is less than 25ft it is possible for the SWIM L-
Band signals to disrupt the low band FSK communication channel at 2.3MHz. This could result in channel tune
issues with the COM3000 system. The syslog will then often report SWM errors.
Additional attenuation between the DSiM30 and the COM51 is required. Recommended device is a DIRECTV
approved DRE loop through tap with a 6-, 9-, or 12-dB value. Connect the input port to the DSWiM30 and the tap
port to the COM51. Terminate the output port.
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