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Cascading 6x8s for those that care.

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Old 02-14-2009, 04:19 PM   #1  
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Default Cascading 6x8s for those that care.

Here is a pic of the 5 room HD/DVRs I did today. Thought I would share.
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Old 02-15-2009, 11:03 PM   #2  
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Originally Posted by justinbwill View Post
Here is a pic of the 5 room HD/DVRs I did today. Thought I would share.
Sorry, you should never, ever cascade WB68s. Zinwell specifically tells you not to. It will work in some installations but there are many examples of problems. If you have long cable runs, passing the power from the receivers through two WB68s (because they are unpowered) can cause you not to have enough power to drive the LNBs and you will get 771s. Multiple WB68s should always be driven in parallel - power-passing wide-band splitters on the four lines from the dish driving the four inputs to two WB68s, giving 16 outputs.
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Old 02-16-2009, 08:47 AM   #3  
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The correct way to drive two WB68s to get more than eight tuners is shown in the "sticky" at the top of this forum, http://www.highdefforum.com/directv-...28jan2007.html
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Old 02-16-2009, 11:14 AM   #4  
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Why not use SWM ?
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Old 02-16-2009, 12:19 PM   #5  
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Why not use SWM ?
An SWM dish would only support 8 tuners and the customer needed more than that, so an SWM dish is a non-starter. DirecTV installers don't typically carry standalone SWM8 multiswitches, and in any case you would need two of them (driven in parallel from splitters, the same way the WB68s should be). The customer would have to buy those himself. Or you could have one SWM8 and one WB68 driven in parallel. Or in this case you could have a WB68 cascading to an SWM8; cascading is acceptable for that configuration because the SWM8 is a powered multiswitch and so you are not reliant on the receivers - but it's still better to drive them in parallel.
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Old 02-16-2009, 02:00 PM   #6  
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An SWM dish would only support 8 tuners and the customer needed more than that, so an SWM dish is a non-starter. DirecTV installers don't typically carry standalone SWM8 multiswitches, and in any case you would need two of them (driven in parallel from splitters, the same way the WB68s should be). The customer would have to buy those himself. Or you could have one SWM8 and one WB68 driven in parallel. Or in this case you could have a WB68 cascading to an SWM8; cascading is acceptable for that configuration because the SWM8 is a powered multiswitch and so you are not reliant on the receivers - but it's still better to drive them in parallel.

Regardless of the splitter, the SWM LNB only supports 8 channels. So you could have 4 DVR's or 8 non DVR's or a combination that equals 8 channels/tuners
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Old 02-16-2009, 04:38 PM   #7  
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wow....what a mess.

im glad dish doesnt do that, only needs one cable per 3 tuner dvr.
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Old 02-16-2009, 05:14 PM   #8  
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wow....what a mess.

im glad dish doesnt do that, only needs one cable per 3 tuner dvr.
The SWM system only uses a single cable to each DVR. What you see in the picture is a configuration using the WB68 multiswitch, which is the "old" DirecTV system. Whichever system you use, supporting 10 tuners in a single installation has its challenges.
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