From 917fabe2d4ae50df2f358c528125964c1d1ede70 Mon Sep 17 00:00:00 2001 From: Correl Roush Date: Thu, 19 Dec 2024 00:19:07 -0500 Subject: [PATCH] notes --- 20211201125733-power_over_ethernet.org | 20 +++++++++++++++++++- 20241218203359-cisco_8841.org | 9 +++++++++ 20241218203420-voip.org | 4 ++++ 3 files changed, 32 insertions(+), 1 deletion(-) create mode 100644 20241218203359-cisco_8841.org create mode 100644 20241218203420-voip.org diff --git a/20211201125733-power_over_ethernet.org b/20211201125733-power_over_ethernet.org index 0521e9f..e6e0e80 100644 --- a/20211201125733-power_over_ethernet.org +++ b/20211201125733-power_over_ethernet.org @@ -10,4 +10,22 @@ | 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 802.3bt (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 diff --git a/20241218203359-cisco_8841.org b/20241218203359-cisco_8841.org new file mode 100644 index 0000000..5f33092 --- /dev/null +++ b/20241218203359-cisco_8841.org @@ -0,0 +1,9 @@ +: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) diff --git a/20241218203420-voip.org b/20241218203420-voip.org new file mode 100644 index 0000000..74c9815 --- /dev/null +++ b/20241218203420-voip.org @@ -0,0 +1,4 @@ +:PROPERTIES: +:ID: 256a8e18-be6e-46a1-8c1a-2f124c145c45 +:END: +#+title: VoIP