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That's called Full Duplex.



>the loss at 19mhz obviously isnt hurting you here. what I think it is, is the downstream signal. As the modems talk or pole the headend, there is a upstream and a downstream conversation for lack of a better word. So what is the downstream frequesncy speaking to this modem, is it being affected by to much loss?
>
>Imagine the modem asking the headend a question upstream at 19 mhz, its working just fine, but the answer at a higher freq is attenuated to much through the splitters. Just a thought
>good luck
>Jeff
>
>>I install a lot of cable modems. Have installed several kinds but the ones I'm havinf trouble with is the GI Surfboards. The cable modem is external and connects to an ethernet card.etc,etc,etc,
>>the problem is that when it is hooked to a four way splitter or eight way the modem becomes unstable or works intermittingly. I use primarily Regal Gold 120db EMI or Tru Spec 120dB EMI. The modem would work fine thru a 2way or three way but 4's and 8's would kill it. The RF being sent back was 19MHz and it measured 45db before the 4 ways and 45 dB out of the four way input. This was very strange and have no explanation for it.Has anyone come across this before or know why this happens. It is easily gone around to get it going again but the WHY is peckin at me. help if ya can. Thanks
>> (-REDACTED-)
This is CABL.com posting #28255. Tiny Link: cabl.co/mhvT
Posted in reply to: Re:Return path Problem w/ Modems by Jeff@CableResourcesInc
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