pmeerw's blog

Mon, 10 Apr 2017

GL.iNet AR150 WiFi AP with PoE (803.3af) and OpenWrt pre-installed

GLi's AR150 is a 802.11n WiFi router with two ethernet ports (WAN, LAN). It comes with OpenWrt pre-installed. The unique features (for a 25€ device) is PoE 802.3af support.

Other features: 400 MHz Atheros MIPS CPU, 64 MB RAM, 16 MB SPI flash, 1x USB 2.0, 4 GPIOs + UART on a 2.54 mm header (nicely marked)

posted at: 23:04 | path: /review | permanent link

Mon, 04 Jan 2016

Unboxing TP-Link TL-POE10R PoE splitter

Got a TP-Link TL-POE10R Power-over-Ethernet (PoE) splitter (Ver: 4.0), complying with IEEE 802.4af; output is selectable: 5V/9V/12V into a 5.5mm OD, 2.1mm ID center positive barrel receptacle. Ethernet supports up to 1000Mbps.

It is not galvanically isolated and has a ground loop issue.

PCB top

There is a Feeling Technology FP5001 PWM (pulse width modulation) controller with SCP (short-circuit protection) / DTC (duty control); click to enlarge.

PCB bottom

There is a Linear LTC4257 PoE interface controller; click to enlarge.

Images courtesy Armin Langhofer.

posted at: 21:55 | path: /review | permanent link

Mon, 21 Dec 2015

More Zyxel GS1900 switches

Got another Zyxel GS1900-8HP switch, with 70 W PoE. Read a nice review.

Unfortunately, the root shell capability is gone with firmware 2.10. Playing with EEE (Energy-Efficient Ethernet, IEEE 802.3az) and LLDP (Link Layer Discovery Protocol, IEEE 802.1ab) now...

posted at: 23:54 | path: /review | permanent link

Fri, 10 Oct 2014

Linux on the Lenovo Thinkpad X240

posted at: 12:00 | path: /review | permanent link

Thu, 11 Sep 2014

More managed ports: Zyxel GS1900-8

Needed more Ethernet ports (8x 10/100/1000), so got a web-managed switch, the Zyxel GS1900-8. Can do 802.1q, 802.1x, 802.3az (VLAN, port auth., green ethernet), 2.7 W when idle.

Want root?

cat /proc/version

Linux version 2.6.19 (
(gcc version 3.4.4 mipssde-6.03.00-20051020) #2 PREEMPT Wed Jun 25 15:14:20 CST 2014
cat /proc/cpuinfo
system type		: RTL8380
processor		: 0
cpu model		: MIPS 4KEc V7.0
BogoMIPS		: 498.07
wait instruction	: yes
microsecond timers	: yes
tlb_entries		: 32
extra interrupt vector	: yes
hardware watchpoint	: yes
ASEs implemented	: mips16
VCED exceptions		: not available
VCEI exceptions		: not available

posted at: 22:54 | path: /review | permanent link

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