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Forums » US Cable Support » Comcast » Comcast HSI » [Connectivity] Motorola 5100 vs. 5120
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« [Connectivity] Throw me a C-Bone  

Nerdtalker
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Re: [Connectivity] Motorola 5100 vs. 5120

SB5100
• Has some upstream issues in ex-attbi areas, possibly firmware related
• Broadcom chipset handles noise better, and is thus hardier in 256QAM environments

SB5120
• Doesn't have the same upstream issues the SB5100 has (as far as I know)
• TI (Texas Instruments) chipset is more susceptible to noise related issues, especially in a 256QAM modulated plant
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permalink · 2005-10-08 17:19:12 · Print · Reply to this
rseiler

join:2001-11-01

Re: [Connectivity] Motorola 5100 vs. 5120

said by Nerdtalker See Profile :

SB5100
• TI (Texas Instruments) chipset is more susceptible to noise related issues, especially in a 256QAM modulated plant
Could you expound on that? Noise from what? Is there something I should be keeping it away from? And what's a "modulated plant"?

Incidentally, I note that I have firmware "SB5120-2.9.2.10-SCM03-NOSH," and I've seen references to it going back to last year. If it's still current, I guess they don't update it very often.
permalink · 2005-10-08 17:52:19 · Print · Reply to this

Nerdtalker
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join:2003-02-18
Tucson, AZ
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Re: [Connectivity] Motorola 5100 vs. 5120

said by rseiler See Profile :

Could you expound on that? Noise from what? Is there something I should be keeping it away from? And what's a "modulated plant"?
Noise as in low SNR (Signal to Noise Ratio). It just isn't as good at handling excessive noise (below 33dB) when the downstream channel is using 256QAM for modulation as the SB5100's broadcom chipset is.

Plant is just a term for cable system.
--
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permalink · 2005-10-08 17:58:25 · Print · Reply to this
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