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"Cable Signal Strength"

Home Cable Internet Conferences Cable Modem Discussion (Public)
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Original message

Mike	10/27/2002, 07:27 PM ()
"Cable Signal Strength"
A question for all you techies out there. Can anyone tell me what the signal strength should be at the demarcation point in decibles? I have both video and broadband service thru my cable company. If the signal strenth can vary for video and broadband, please tell me what the optimum should be for both and acceptable tolerances
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Table of contents

RE: Cable Signal Strength, Anonymous Coward, 11/02/2002, (1)

RE: Cable Signal Strength, Me, 01/14/2003, (3)

RE: Cable Signal Strength, chad liner, 11/28/2002, (2)

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Messages in this topic

Anonymous Coward	11/02/2002, 05:09 PM ()
1. "RE: Cable Signal Strength"
A perfect signal on the downstream (coming in) is exactly 0 DbmV. This is no loss and no gain. Acceptable ranges are between -10DbmV and +10DbmV with -7 to +7 being optimum and 0 being perfect. For upstream (outgoing) your modem should have to push no more than 55DbmV at the maximum. Around 40 to 50 is about as perfect as it gets in most cases. This of course does not take into consideration microreflections or SNR issues that may arise from ingress or pushing back through too many splitters and/or amplifiers.
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chad liner	11/28/2002, 04:49 AM ()
2. "RE: Cable Signal Strength"
The optimum level would be 45db upstream and around 0 db on the down however that is in a perfect world. If its between 40-55db up and plus or minus 15db on the down its ok
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