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Sound Reinforcement - Forums for Live Sound Professionals - Your Displayed Name Must Be Your Real Full Name To Post In The Live Sound Forums => LAB: The Classic Live Audio Board => Topic started by: TomBoisseau on February 02, 2017, 05:12:54 PM
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I'm about to purchase my first Cisco SG300-10 switch for use with a Yamaha QL1 and QL5. The problem is that there seems to be MANY choices within this same product line (see the link below and the click "View All").
The features I want are:
10 ports
PoE
But, even then there appears to be a few different versions. Could someone please assist me in choosing?
Thanks,
Tom
http://www.cisco.com/c/en/us/support/switches/small-business-300-series-managed-switches/tsd-products-support-series-home.html
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They are great switches. This is my understanding of of the differences:
SG300-10 - no POE
SG300-10P has 8 POE ports but is limited to 15W/port and total of 64watts
SG300-10MP has 8 POE ports but is limited to 15W/port and total of 124watts
SG300-10MPP has 8 POE ports but is limited to 30W/port and total of 124watts
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They are great switches. This is my understanding of of the differences:
SG300-10 - no POE
SG300-10P has 8 POE ports but is limited to 15W/port and total of 64watts
SG300-10MP has 8 POE ports but is limited to 15W/port and total of 124watts
SG300-10MPP has 8 POE ports but is limited to 30W/port and total of 124watts
Ah! Okay. That helps a lot.
Thanks so much.
I'm inclined to purchase the model with the highest wattage for PoE with 10 ports. I suspect while I might not need it now, in the future I'll probably glad I spent the few extra dollars. I'm leaning towards the SG300-10MPP which is 124W (PoE+ supported). What do you think? Any comments?
I see there is a comparison chart with specs here:
http://www.cisco.com/c/en/us/products/collateral/switches/small-business-smart-switches/data_sheet_c78-610061.html
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Personally, I find the 10 port Cisco SG300 with POE a pain to package. You can rack mount them but there is a large external power supply.
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Personally, I find the 10 port Cisco SG300 with POE a pain to package. You can rack mount them but there is a large external power supply.
You make a good point, and I am aware that many prefer to get the rack mount version with 20 ports or more. For my application, this unit will never be in a rack and, I just prefer to have a smaller footprint.
Thanks,
Tom
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Are there any concerns plugging non PoE devices into the PoE ports of the SG300-10MPP? For instance a console, Rio box, or another non PoE switch?
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Are there any concerns plugging non PoE devices into the PoE ports of the SG300-10MPP? For instance a console, Rio box, or another non PoE switch?
I haven't seen any problems connecting QLs, Rios, WAP and other switches. I've never felt the need to check but I suspect POE is configurable by port on the SG300 and I believe POE is only supplied after handshaking.
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I believe POE is only supplied after handshaking.
I wonder how handshaking works when one of the devices hasn't been powered up yet...
Mac
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I wonder how handshaking works when one of the devices hasn't been powered up yet...
Mac
A Powered Device has a 25k resistor across the powered pair(s) when powered off. Higher or lower resistance means that power isn't supplied.
High power modes are negotiated after an initial low power startup.
Philip
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I wonder how handshaking works when one of the devices hasn't been powered up yet...
Mac
An active device can interrogate a passive device before the interrogated device is powered. This is a protocol that is used in electric vehicle charging for example but now we are off topic...
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An active device can interrogate a passive device before the interrogated device is powered. This is a protocol that is used in electric vehicle charging for example but now we are off topic...
802.3af is the specification. It's and IETF spec. Being able to plug a non-powered device in without damage is a requirement. http://www.rhyshaden.com/eth_poe.htm
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Well...
I just picked up a SG300-10MPP. You guys are right! That's a BIG, nasty, power supply. I understand now why so many were recommending the rack mount 20/24 port version with an internal power supply! That probably makes sense.
Tom