Now for some TEA !
Today my good friend visited me... the one who works in Telecom for Orange. You know the one who gave 2 weeks ago this very orange telephone hand set to test copper line, and these 2 huge Alcatel xDSL related boards.... well today he gave yet something !
In some technical building he was working in, as per usual... guess what he found ? Some other Tech left something behind ! A handheld xDSL test instrument ! Friend told me it works just fine, and battery even still fully charged ! Whoever lost it, was very recently !
Now I know squat about telecom stuff, but well I just got copper lines installed 3 months ago, and the house builder ran a few Ethernet cables in the house... so could have some fun running tests on that ?!
Device only does xDSL and LAN. At the front is has an RJ11 connector for DSL / copper lines, and an RJ45 for LAN.
Little LCD graphical screen. I don't understand 90% of it but I noticed at the top right a menu entry by the name of " DMM Test ". Hey at least I know what a DMM is so let's try that !
Apparently it can measure Vdc and Vac, as well resistance, inductance and capacitance. From that it can tell you the length of cable. Maybe it can do some TDR / fault finding this way ?! Don't know.
Learned something anyway : friend said that on a copper line/pair, a healthy line measures 50nF of capacitance to ground, per kilometer of cable, ... and that's what mostly explains why the signal gets weaker over distance, hence why ADSL speed quickly diminished as you get farther from the source/emitter, whatever it's called, I don't know !
The device bears no manufacturer name that I can see. Not too surprise, Orange / ex France Telecom was wealthy enough back in the day, to get their own stuff custom made. Might still be an off the shelf yet unbranded device, I don't know... maybe someone does...
Anyway, model number written at the back reads : " ST332B ". Maybe I can find a user manual for it on the web.. would be helpful !
Quick tear down pics below.
Main board runs with this Micro : " Nuvoton " never heard of them, model number NUC120RE3AN. Somehow I found the datashett for that !
It's apparently a 50MHz 32 bit ARM "Cortex 0" chip. Specs nothing special. ROM/RAM and peripheral wise, it's like your basic 8 micro, except it embeds a 32 bit core rather than 8 bit.
There is a daughter board that handles the Ethernet stuff I think... carries a big BROADCOM chip, P/N BCM 63381 , for those who actually know this stuff.... ie not me !
There are half a dozen cute little relays in the thing. Keyboard : tactile switches, however not the cheap kind : Look at them, 100% metallic construction ?!
Never seen luxurious ones like that... probably because all the ones I salvaged came form cheap consumer devices, not pro stuff made for field use !