Comments on: High power PoE and HDBaseT https://www.epanorama.net/blog/2012/05/02/high-power-poe-and-hdbaset/ All about electronics and circuit design Thu, 23 Apr 2026 21:20:30 +0000 hourly 1 http://wordpress.org/?v=3.9.14 By: Wesley https://www.epanorama.net/blog/2012/05/02/high-power-poe-and-hdbaset/comment-page-5/#comment-1872095 Fri, 27 Feb 2026 10:43:54 +0000 http://www.epanorama.net/blog/?p=8310#comment-1872095 Strong overview of PoE evolution and the move toward higher power delivery like HDBaseT. The key takeaway is safety and standards compliance. Once deployments push beyond 60W or approach 100W, thermal limits and NEC requirements become critical.

HDBaseT’s structured PD detection and adherence to IEEE specifications make it far safer than proprietary high-wattage claims. As PoE demands grow for cameras and displays, standards-based infrastructure matters.

For compatible enterprise networking hardware, see:
https://ormsystems.com/routers/cisco-routers-price.html

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2012/05/02/high-power-poe-and-hdbaset/comment-page-6/#comment-1849891 Sat, 29 Mar 2025 16:29:56 +0000 http://www.epanorama.net/blog/?p=8310#comment-1849891 Raspberry Pi Power-over-Ethernet Injector zaps life into networks lacking spark
Official PoE+ HAT+ for the Pi 5 still MIA
https://www.theregister.com/2025/03/24/raspberry_pi_poweroverethernet/

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2012/05/02/high-power-poe-and-hdbaset/comment-page-6/#comment-1844288 Wed, 22 Jan 2025 09:45:54 +0000 http://www.epanorama.net/blog/?p=8310#comment-1844288 USB-C poweroinnissa on mahdollisuudet eri jännitteille parhaimmillaan alueella 5-48V ja virta maksimissaan 5A uusimpien standardien mukaan. Suurimmalla jännitteellä teoriassa jopa 240W. Tuo jännitevaihtoehtojen tukeminen toki tuo monimutkaisuutta johdon kumpaankin päähän. Suunniteltu kaapelin pituudelle pari metriä.

Vertailun vuoksi PoE standardit tarjoaa maksimissaan luokkaa 100W tehoa mutta paljon pidemmille matkoille. PoE käyttää tyypillisesti 48-57V jännitettä.

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2012/05/02/high-power-poe-and-hdbaset/comment-page-6/#comment-1841126 Fri, 13 Dec 2024 09:11:42 +0000 http://www.epanorama.net/blog/?p=8310#comment-1841126 RJ12, RJ45, RJ50: max current per pin?
EEVblog
13 Dec 2020 — I push up to 1A through a wire pair ( 24Vdc and GND return) of CAT-5 and RJ45 connectors. For “Power Over Ethernet” which is an offical standard …
https://www.eevblog.com/forum/projects/rj12-rj45-rj50-max-current-per-pin/

Do not forget that the connector contacts are not the weakest point, there is also a thin wire and not very strong connection of the knives with the wire in the connector. Wurt Electric offers two types of PoE connectors: 350mA (pn 74982104400) and 600mA (pn 74984104400) both THR. Note that this is the current for a pair of contacts.

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2012/05/02/high-power-poe-and-hdbaset/comment-page-6/#comment-1841125 Fri, 13 Dec 2024 09:10:07 +0000 http://www.epanorama.net/blog/?p=8310#comment-1841125 https://wiki.opensourceecology.org/wiki/Cat_5_Ampacity

Ethernet cable is a common type of cable – it is CAT 5 or 6 cable. It typically comes in 4 pairs, but is also available in 12 or more.

http://www.sumidacrossing.org/LayoutElectricity/MRRWire/WireAmpacity/ – says AWG 24 carries 3.5A open and 2A enclosed.

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2012/05/02/high-power-poe-and-hdbaset/comment-page-6/#comment-1841124 Fri, 13 Dec 2024 09:09:11 +0000 http://www.epanorama.net/blog/?p=8310#comment-1841124 around 1.5 amperes
The maximum current rating for an RJ45 connector is typically around 1.5 amperes. This is the maximum amount of current that the connector can safely handle without overheating or becoming damaged.
https://www.a1securitycameras.com/blog/what-is-an-rj45-connector/

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2012/05/02/high-power-poe-and-hdbaset/comment-page-6/#comment-1836076 Sat, 21 Sep 2024 09:15:01 +0000 http://www.epanorama.net/blog/?p=8310#comment-1836076 https://www.hackster.io/alan43/a-really-small-poe-ip-camera-fc37a5

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2012/05/02/high-power-poe-and-hdbaset/comment-page-6/#comment-1832932 Fri, 26 Jul 2024 08:00:48 +0000 http://www.epanorama.net/blog/?p=8310#comment-1832932 https://ui.com/switching/professional-max

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2012/05/02/high-power-poe-and-hdbaset/comment-page-6/#comment-1832182 Sat, 13 Jul 2024 13:22:19 +0000 http://www.epanorama.net/blog/?p=8310#comment-1832182 Waveshare Shrinks Its Raspberry Pi 5 Power-over-Ethernet HAT, Boasts Official Case Compatibility
A new, more compact L-shaped board leaves room for an official Raspberry Pi 5 Case cooling fan to do its thing.
https://www.hackster.io/news/waveshare-shrinks-its-raspberry-pi-5-power-over-ethernet-hat-boasts-official-case-compatibility-f098a82d4ed5

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2012/05/02/high-power-poe-and-hdbaset/comment-page-6/#comment-1831647 Fri, 05 Jul 2024 20:31:39 +0000 http://www.epanorama.net/blog/?p=8310#comment-1831647 Kuinka paljon jännitettä ja virtaa verkkokaapeli kestää?
https://fi.kbs-connector.com/info/how-much-voltage-and-current-can-the-network-65409910.html

Verkkokaapelin suurin jännitearvo 15 V on jännitearvo, joka ei aiheuta suoraa kuolemaa tai toimintakyvyttömyyttä. Normaalissa ympäristössä “turvallinen extramatala jännite”, johon ihmiskeho sallii jatkuvan kosketuksen, on 36 V. Ihmiskeho ei pysty havaitsemaan alle 36 V:n jännitettä. Ja Ethernet-dataa lähettävän ja vastaanottavan signaalin AC-korkeataajuisen signaalin jännite 100M sisällä ei ylitä 3V.

Yleensä tietokoneiden välisen verkkokaapelin siirtosignaalin AC-korkeataajuisen signaalin jännitearvo ei ylitä 3 V

Jos kuormitusta tarvitaan, sinun on käytettävä POE-laitetta, jonka jännitearvo on noin 48 V.

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