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Monoprice SlimRun Cat6a Ethernet Cables: 10-Pack 10' (Yellow) $15, 5-Pack 5' Expired

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Last Edited by jagoodie January 29, 2020 at 06:27 PM
FYI - thinner wires may be problematic for POE applications but work great otherwise

Basic Voltage Drop Law
Vdrop = IR

P(loss) = V(drop)*I
V(drop) = I*R
Substitute for V and the formula for power loss is I^2*R

where:
I : the current through the object, measured in amperes
R : the resistance of the wires, measured in ohms

comparing these cables to a cat6/6A which has 23 AWG copper wires:

AWG inch mm per inch per cm kcmil mm2 O/km O/kFT
23 0.0226 0.573 44.3 17.4 0.509 0.258 66.79 20.36
30 0.0100 0.255 99.7 39.3 0.101 0.0509 338.6 103.2

103/20 = about 5

So a 30 AWG wire has 5x the resistance vs a 23 AWG wire

basically you're looking at losing 5x more power when using a 30 AWG wire compared to a 23 AWG wire.

ref:
https://www.calculator.net/voltag...lator.html

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Featured Comments

TL;DR: For short patches these aren't bad despite the "experts" here going on about "but physics". (I've got an CompE degree too TYVM)


I assure you, they accounted for 'physics' when they wrote 802.3at Type2 "PoE+" and the resistance numbers you're quoting are actually incorrect to boot. How about we also look up the POE+ and cable specs?
- max cable resistance is 12.5 ohms
- max voltage drop is 7.5v (based on PSE vs PD)
- max power loss is 4.5w (based on PS vs PD)

MonoPrice lists: 37.6 ohms/100m so the 50' (15m) cable is 5.5 ohms.
22g/23g cat6 usually comes in ~9-9.5 ohms/100m

Calculate your run length + patch cord and decide accordingly. If thin patch cables are needed due to cable count, aesthetics, or other reasons make sure your total run is in spec.
e.g. 25m plenum cat6 + 2m patch = 3.13 ohms and is well with spec.


*Mic drop*


But wait... calculating for volts and then talking about power (watts)? Those are NOT the same thing/unit/measurement. Might as well say you've got a 18 gallon gas tank therefore your MPGs are better. If we want to work out the math for fun:

P(loss) = V(drop)*I
V(drop) = I*R
Substitute for V and the formula for power loss is I^2*R

- 600ma (0.6A) max @ 12.5 ohms max = 7.5V (which is exactly what the PoE spec calls for)
- Power loss would thus be 0.6^2*12.5 = 4.5w (which, shockingly, is exactly to spec)


And EXTRA ALSO - this is *only* for PoE delivery. It has NOTHING to do with attenuation which is *far* more relevant for 1G/10G runs. Folks having problems with these cables are almost certainly having signal issues, not PoE, and especially so if they've got longer runs near/at/over max spec.
very thin wires: 30AWG

recommend not using these for PoE and go instead with cable that has copper 23/24 AWG wires for PoE
For those wondering, thickness of wire increases as the gauge number decreases. It's counter intuitive. So, thought I'd mention. 30 is less thick than 24.

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Joined Dec 2011
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> bubble2 1,278 Posts
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sagrr
01-23-2020 at 05:38 AM.
01-23-2020 at 05:38 AM.
It seems like it's a lot cheaper on amazon usually?
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DenMan
01-23-2020 at 07:44 AM.
01-23-2020 at 07:44 AM.
Quote from sagrr :
It seems like it's a lot cheaper on amazon usually?
I just compared prices - for these particular sets of cables they are definitely cheaper on Monoprice as of now. I thought shipping would make them even out but I'm actually getting the rare free shipping from Monoprice for these sets.

Edit to add - I like these cables a lot, I have about a dozen of them now. They are nice and slim yet rugged. Not totally "lay flat" but not nearly as bad as most ethernet cables that keep that coil shape.

Thanks OP, picked up two packs.
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Last edited by DenMan January 23, 2020 at 08:17 AM.
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> bubble2 393 Posts
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The_Wilder_Spirit
01-23-2020 at 08:26 AM.
01-23-2020 at 08:26 AM.
I love these cables. Really practical and less Ridgid than traditional cat cable.
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Joined Mar 2008
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> bubble2 9,308 Posts
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mat2000
01-23-2020 at 08:46 AM.
01-23-2020 at 08:46 AM.
very thin wires: 30AWG

recommend not using these for PoE and go instead with cable that has copper 23/24 AWG wires for PoE
Reply
Joined Jun 2014
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> bubble2 154 Posts
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SickNotes
01-23-2020 at 08:59 AM.
01-23-2020 at 08:59 AM.
For those wondering, thickness of wire increases as the gauge number decreases. It's counter intuitive. So, thought I'd mention. 30 is less thick than 24.
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Joined Dec 2016
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> bubble2 474 Posts
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fvp1992
01-23-2020 at 09:02 AM.
01-23-2020 at 09:02 AM.
👍 Does this work for any other lengths/colors?
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Joined Dec 2008
The Discerning Bargainer
> bubble2 244 Posts
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elmedico27
01-23-2020 at 09:03 AM.
01-23-2020 at 09:03 AM.
Quote from mat2000 :
very thin wires: 30AWG

recommend not using these for PoE and go instead with cable that has copper 23/24 AWG wires for PoE
Thanks for the heads up. Have you used these in a PoE situation with negative results? I actually have a pack of these in 1ft that I really like but I'm looking into adding a PoE switch for a couple devices and was wondering if I should move to some non-SlimRun cables for those.
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dragontales
01-23-2020 at 09:06 AM.
01-23-2020 at 09:06 AM.
Anyone run these under carpet? Any noticeable bump?
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spamdie
01-23-2020 at 09:08 AM.
01-23-2020 at 09:08 AM.
Quote from elmedico27 :
Thanks for the heads up. Have you used these in a PoE situation with negative results? I actually have a pack of these in 1ft that I really like but I'm looking into adding a PoE switch for a couple devices and was wondering if I should move to some non-SlimRun cables for those.

They can work with poe but the range is limited. The top end brand that sells and certifies their cables that is not monoprice has like a maximum of 27 meters. But normal wires would be better in any case. It all depends on the device though. If it is a low power device you can get away with it.
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Last edited by spamdie January 23, 2020 at 09:10 AM.
Joined Dec 2009
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spamdie
01-23-2020 at 09:11 AM.
01-23-2020 at 09:11 AM.
Quote from dragontales :
Anyone run these under carpet? Any noticeable bump?

Probably not good to run this wire under carpet.
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mat2000
01-23-2020 at 09:13 AM.
01-23-2020 at 09:13 AM.
Quote from elmedico27 :
Thanks for the heads up. Have you used these in a PoE situation with negative results? I actually have a pack of these in 1ft that I really like but I'm looking into adding a PoE switch for a couple devices and was wondering if I should move to some non-SlimRun cables for those.
Hi elmedico27

Physics

The ability of a wire to transmit power is based on the surface area, the smaller the diameter of the wire the higher the resistance, heat, power loss - which means less efficiency and less distance the cable can run.

http://poe-world.com/Calculator/

Basically: you really do not want to use thin wires to transmit power
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Joined Sep 2011
Deplorable
> bubble2 2,918 Posts
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jhooper
01-23-2020 at 09:20 AM.
01-23-2020 at 09:20 AM.
FYI: All CATx certified cables must be pure copper. CCA (Copper Clad Aluminum) isn't up to spec, but it's a lot cheaper.
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