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Correl Roush 2024-12-19 00:19:07 -05:00
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20
20211201125733-power_over_ethernet.org
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| PoE | IEEE 802.3af (Type 1) | 15.4 W | 12.95 W | | PoE | IEEE 802.3af (Type 1) | 15.4 W | 12.95 W |
| PoE+ | IEEE 802.3at (Type 2) | 30 W | 25.50 W | | PoE+ | IEEE 802.3at (Type 2) | 30 W | 25.50 W |
| PoE++ | IEEE 802.3bt (Type 3) | 60 W | 51 W | | PoE++ | IEEE 802.3bt (Type 3) | 60 W | 51 W |
| Poe++ | IEEE 802.3bt (Type 4) | 90 W | 71.3 W | | PoE++ | IEEE 802.3bt (Type 4) | 90 W | 71.3 W |
#+caption: PoE Classes
| Class | Usage | Classification current (mA) | Power range at PD (W) | Max power from PSE (W) |
|-------+------------------------------------------+-----------------------------+-----------------------+------------------------|
| 0 | Default | 0–5 | 0.44–12.94 | 15.4 |
| 1 | Optional | 8–13 | 0.44–3.84 | 4.00 |
| 2 | Optional | 16–21 | 3.84–6.49 | 7.00 |
| 3 | Optional | 25–31 | 6.49–12.95 | 15.4 |
| 4 | Valid for Type 2 (802.3at) devices[fn:1] | 35–45 | 12.95–25.50 | 30 |
| 5 | Valid for Type 3 (802.3bt) devices | 36–44 & 1–4 | 40 (4-pair) | 45 |
| 6 | 36–44 & 9–12 | 51 (4-pair) | 60 | |
| 7 | Valid for Type 4 (802.3bt) devices | 36–44 & 17–20 | 62 (4-pair) | 75 |
| 8 | 36–44 & 26–30 | 71.3 (4-pair) | 90 | |
* Footnotes
[fn:1] Class 4 is not allowed for 802.3af devices

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20241218203359-cisco_8841.org Normal file
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:PROPERTIES:
:ID: a349ada2-9535-4113-9043-da914747eea4
:END:
#+title: Cisco 8841
A [[id:256a8e18-be6e-46a1-8c1a-2f124c145c45][VoIP]] desk phone from Cisco. Supports [[id:6de2329b-bdba-45ff-bfda-d4df5c2879c8][Power Over Ethernet]] Class 2, compatible
with IEEE 802.3af/at.
Input power from a separate power brick is 48V at 0.917A (44.016 W)

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20241218203420-voip.org Normal file
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:PROPERTIES:
:ID: 256a8e18-be6e-46a1-8c1a-2f124c145c45
:END:
#+title: VoIP