Hi welcome to Tear Down! Tuesday And yes, I'm actually, uh, letting some people watch this. Uh, well, live. Not through my live cam setup yet, but through my new drop cam. There it is up there.

So Hi to everyone watching at the moment. And I've got one of these new highdefinition drop cams cams. It's a Wi-Fi uh webcam that hooks up uh to and streams live to the net. So uh, the link is down below Eev Blog.com slive if you want to.

uh, well, watch me 247 when I'm here. Anyway, So um, I've turned the mic on. Ordinarily the mic's not on. but anyway, that's an aside.

So I'm not sure how many people are are watching me at the moment. But anyway, here we go. Tear Down! I Scored these just the other day from the Dumpster Room if you're following on. Twitter I Posted a photo of these and what they are is a digital Pabx system.

Obviously someone in the building here has, uh, decided to move out or replace it or shut down or whatever and they've dumped all this gear. Panasonic and NEC uh stuff. So we what we have here is a uh, digital super hybrid system. It's a KX uh, TD 816 Al and this is a TVP 100 voice processing system.

and uh so this voice processing system has uh, inboxes and things like that. So it's got 64 voicemail inboxes. so I expect some digital recording, uh stuff inside this and uh, and this is the actual and I Believe this NEC unit down here is the actual line interface. Uh unit.

It supports two lines with uh, six digital extensions or something like that. I'm not really big on my Pabx system, so someone with more knowledge might know how all these things work and go together. I'll post links down below Anyway, so this digital super hybrid system here. it's designed to hook up to these, uh, digital super hybrid phones.

You may have seen this before I got this from uh, the dumpster along time ago I think I may have even included it in a tear down or something. I'm not entirely sure Anyway, Um, so they're obviously throwing these away back then. that was a long time ago. that was like 9 months ago or something like that.

But this is one of the Uh units which hooks up to one of these systems designed for, you know, sort of a medium, uh, size office. Maybe with, you know, because it's a 64 voicemail inbox? This one. So up to 64 users with their own uh, voicemail inbox. There were multiple versions of these NEC uh line interface units down there, so they could have had many lines with different Uh switching.

In fact, they probably would have. There were about four or five of these down here, but I only nabbed one of them because, well, some of them, like had their guts just spewed out all over the Uh, all over the garbage room floor. anyway. uh, let's crack these open and have a look what's inside I Suspect: Uh, lots of combination of uh dip and I'm not sure what vintage these are, but probably uh, dip with some um surface mount technology.

Lots of digital recording I mean this one's a voice processing system with a 64 inboxes I Expect there to be, you know, digital recording? What's going to store it in? uh, some? SRAM SD ram? uh, something like that I suspect so that'll have some decent processing in it. Uh, this will be like a line interface uh type unit and this one here digital. uh, the actual Uh phone? uh system itself. I'm not sure.

it looks like it's got some sort of modu things on the top I don't know. Anyway, let's crack them open. So the first one is this digital hybrid system Kxd 816 Al This is like the main controller made in Japan beautiful and uh yeah. as I said, it looks like they got like some modules on the top or something like that and uh along the bottom they got Rs23 old school Rs232 interface.

Uh, they got a paging output. um so that' be an audio output. uh, external music so you can Fe feed in your music for your on hold Uh crap and stuff like that normal clear, actually clear the uh system, the firmware and stuff like that and to reset system make sure clear switch is on. that's just like a four pin MX connector or something like that and 240 volt in and that's it.

And clearly this port here is designed. These are like the interface modules so this port here looks like just covers all the cables coming out here so they looks like they wire into here in the two modules and then all the pairs come out. Actually I Expected more uh I/O than this, but it's just got uh things that says uh, 2co and uh PFT ports over here. Um so yeah, not much at all and then this one over here will be exactly the same.

So I mean they've You know, for a big system you probably need multiple units of these. So they got some screws on here and I expect these modules to just pop off the top and it looks like everything. Just um, you know these things are designed for servicing and access and stuff like that because it's just got screws in here and these just pop open like that. Now these ones aren't held captive, but the other ones were and uh, nice little springs on those too.

Nice. I Like that. Um and uh yeah. and there's a hinge on the back here.

So this whole cover. Well there we go. Whole cover will just lift off so it looks like I don't even although there's boards in there. let's let's start out with these ones on the top.

So here we go, let's pop the hood on these and oh oh no fail. They undid the screw and uh oh there we a. duh look at that. Nice.

Okay, that's beautiful. Huge multiway ribbon cable coming out of there. Check out the Ferite. Check out the size of that Bloody Ferite that is Enormous.

Absolutely enormous. Trying to uh uh, do some EMC there and uh, this is what is this. It's a 4 Co line unit. There you go.

So hence we had those uh. two ports each. So I presume we can. Just no looks like we have to pop.

This Hood On here. Hey, here we go. Okay, now we're talking Okay, this is interesting. Check out all the uh, all the uh plastic is that yellowed by the way.

uh, the old plastic like this turns yellow so this could be substantially older. It could be because it heats up. uh, which will do it even sooner I believe. Oh I can see some uh, gas discharge tubes down in there anyway.

um yeah. look here's our uh. here's our lines. so yeah uh.

co1 and 2 3 4 external line One external line two four and up to eight. Hence we had the four two four point units. so this supports eight Co lines and uh, there we go. so we can should be able to whip those out now.

Nice and modular. Really like that that is that is is terrific. But yeah, look at that. look at that big ass Ferite.

I'll keep that that's for sure. It's A.1 in header there for the door phone and check it out. Caution: Do Not remove uh, this cover except qualified personel. Well, I'm ah, broke off look at that.

Hey the ROMs There we go. You can change the ROMs on the sucker obviously. but you know you got to update the uh firmware in these things. And here's just a little module I pulled out next to those.

uh ROMs there. Check it out. Looks like we have ourselves a Uh 16384 MHz uh oscillator here looks like a you know, a fairly Schmick one and parts that you've uh, never heard of Mitel networks unless you're in the trade Mt uh 89, uh 41 BP and I look that up and it is a T1 trunk uh PLL chip. So there you go, that sort of stuff and there'll be a whole bunch of telecoms related uh, chips in here which you would recognize the part number.

bet your bottom dollar on it. Okay, let's pop the hood on this four line Co unit I Still don't know what Co Uh stands for. Uh I Don't know. You'd have to probably read the manual or be in the know in the trade to know what that sort of stuff meant.

but there a lot of engineering which goes into these suckers. this whole thing I mean you know how big is the Design Group at Uh Panasonic that manufactures this? There we go. There's our light. That's what you'd expect.

Uh, you expect all the line interface stuff. We got relays got. uh, gas discharge tubes? Look at that. Yeah, now we're talking There we go.

Looks like we got ourselves a neon lamp too. They're uh, uh, quite common for um, on phone. uh side of things for protection. So uh, and gas discharge? choose they little inductors there.

um got some Ms by the looks of it. So a whole bunch of protection stuff with for all that lightning. You know, because uh, when you've got these sorts of phone systems even though they're not, they're usually only all internal. uh oh no, this would be the one.

No, this, these would be the ones. These would be the yeah, the line interface units going to The Exchange So yes, they do leave the building. So these ones, um, you know, lightning could strike them whatever surges or sorts of stuff. So you know, faing other equipment down the line.

So you got to make sure that all this, uh, is protected and you'll notice these neat little custom hybrids there with something on the other side. They're probably like, uh, uh, no. Reay it says it's marked with Reay there. So these are little, uh, maybe uh, little solid state reays or something.

weird. Yeah, try and buy those or get a data sheet on them. Well, it's actually a M part, so your odds might be a bit better than, uh, usual. Anyway, I had a quick Google of that.

couldn't really find anything but yeah, that's interesting, especially the big bulge on the other side. Look at that. you can get a whole bunch of useful Parts out of these things. and if you can ever Salvage uh, something like this I think we're going to find lots of useful stuff.

Look at these, you know, top quality Om and reays. We' got some NIS brand solid state relays here. You know you like the inductors you can rip out of these things. and you know, little telecoms Transformers You know, very nice stuff.

There's a big ass Fielder cap on here just sitting out there on its loans. some 2200 microfarads 16 volts. So it's not a super cap, but it is a big beast of a cap you wouldn't uh, ordinarily expect to see on here, so it could be for, you know, momentary line outages or something like that, or really, uh, just some heavyduty filtering for the uh Reay switching and stuff like that just so it doesn't interfere with all the uh, line and audio stuff. And here's the back of the board.

Check it out. We got a whole bunch of uh, surface mount stuff on the bottom so they've gone wave soldering of course on the bottom you can, uh, you can tell they're wave soldered and not reflow solder those pads. It just looks entirely different. Got a lot more uh, solder on there.

So these are gone. These have been glued down and then gone through the wave solder process. And of course, they're serious about shielding these things. There we go.

Big shielding plate on the bottom and then this big sort of. it's not Myar. it's some really tough, uh insulating film on there just to make sure nothing arcs over nothing's going to Arc through that through to the uh, grounded. Shield All right now, let's uh, pop the hood on this thing.

Couple of fuses here. Line fuses. They got, uh, line and neutral line fuses. Yeah, double fuse there.

Really going to town and I find. it's always interesting to note things like screws for example. You know, people don't think about those. but think about the designer of this thing.

Somebody whoever designed this had to, you know, hold this case together with a certain kind of screw and then what screws are you going to use in this one? Well, you've already specified these in your bill of materials. so exactly the same ones are used to hold these modules together. I Just find it's interesting to note that sort of stuff. Okay, let's lift this thing up.

Tada We're in like Flynn Look at that. Yeah, once again, more line interface. uh stuff around here. Big ass.

Uh Mains Transformer there and looks like we got a big super cap under there. And anyway, let's have a look. Now the first thing I Notice here is all this grounding system. Look at this.

They got a big Central plate. Well, a couple of central plates here all tied together, all crimped. um, all crimped properly. Shake Proof Washers Everything The Transformer down here.

this one goes down to this Transformer and also up to here. and this is a uh, this has got like little fingers in there so they obviously like something like a grounding steak or something plugs into the outside of this. oh no, sorry, no no that goes through. I'll show you.

no, no, check this out there. We go here, we go. There's the matching. There's the case on top and there we go.

It's got a matching tab so this slots directly down into that. Very nice when this lid goes on like that. Ah That's that's just beautiful. That is beautiful design.

I Really like that and there. Serious about their ferites too. They got more there and there. There's another one up there there we go so you know they're not mucking around.

and more ferites on the ribbon cables? look at those there and there. W Belt and braces and they've got good quality. Rubicon caps in there. only 85 C though.

although I'm not sure you know these are designed for office environments. Things like that to be installed uh, inside typically so you know. Not a huge deal and probably not at the end of the day. Not a huge uh, power consumption on these things.

So we got ourselves our switch mode down here. Big heat sink, all largely spread out. Looks really good. Here's these two line fuses on the top.

got one in the active and the neutral. uh lines. They've gone to the effort to make their own plastic body to hold those in place and bring them up and they've gone to the effort to, uh, you know, do a big plastic uh standoff here for this. It's not even a power button, it's just a power lead and they've molded that into the case and bought it out and screwed it in and molded that plastic cover.

and a goodness. And there's the main micro you probably haven't seen before. T Sheba TMP 68301 And it's a 16bit micro. Couldn't get a full data sheet, just a basic pin out and block diagram and stuff like that.

H the J Maybe it's big in Japan Who knows knows. You'll notice though, that the board layout this is actually quite common to. uh, get the get these .1 in headers around here. So this is for development and debugging.

They can, uh, plug the emulator directly in there and debug all the code and everything else so you know this isn't most likely not like a flash microcontroller with your serial interface that you, uh, used to. So they need you know. Really old school, um, uh, sort of. You know.

emulator and development system for this. and we've got our first glimpse of a date code to 01 So 2001. so you know about 13 years old there's another one in here. 02 so maybe 12 years old? something like that.

But the design probably even dates back further than that. And that front door uh interface over here we talked about before. Well, that's got a Myel Uh chip you've never heard of. It's the Mt 8981.

It's a digital switch specifically designed for PCM encoded Uh data streams and in this case it's a multi Channel up to 128 64k bits pers. Second Uh channels it can handle split up into several parts, so 32 of those there's four of them and 32 of those Uh channels are combined to form a 2 megabit St bus. So I'll link in the data sheet for that one for those interested. And once again, the back of this uh daugh board got surface mount stuff on it.

you know, fair amount and it's all uh wave solded as well. So let's have a look at these inputs here. as we saw before this: these are the Uh extension lines. so there's eight extension lines here.

These go to the digital uh phone that we looked at. so these are all the internal wiring, so you'd expect less protection on these internal ones cuz you know it's not. It's not like you're going to get a lightning strike inside the building or something like that, whereas the Um outside lines these Co lines, there's four of those. So let's have a look at how that translates to 8 and 4 over here on the daughter board.

Well, 2, 4, 68. Oh no, sorry, 2, 4, 6, 8. So they're our eight line inputs and you'll notice that all that circuitry around there. For those, there's really no major protection around those, so there's no gas discharg tubes.

There's no Ms or anything like that. you know there's not that huge requirement. Whereas these four down these ones down here, which handle, uh, the four incoming lines which go to the Um which, actually, you know, go outside the building to the exchange. then.

well, here's your four channels here. like two on each, uh, two on each connector there. So once again, you got your big gas discharge uh tubes here and you've got your Uh Ms as well. So you know decent protection on there.

and youve got your line isolation Transformers too. And then these here are your individual Uh channels. Once again, we've got eight of those for those eight internal lines which go to the phone. So yeah, a couple of nice little tiny pitch surface mount s down in there have to get in there, take a look.

But obviously, is that like like another line isolation? Transformer Perhaps. And then maybe some uh uh. line drivers? eh, something like that. So there's a Uh Japan radio Corp Mjn 319.

It's just a dual comparator. The interesting one is over here. On this side. Tada We have ourselves an Mc14 LC 5480 Let's go to to the data sheet.

so this is a real interesting part and as always, I'll link in the data sheet and uh, what is this PCM codec? So it's basically got a Dack and an ADC in there and it's also doing uh, some filtering as well. like it does sin x on X stuff and or you know, companding and all sorts of stuff. Uh, to convert, there's the uh, there's the receive. uh, well, the receive line r Well, it's the Dack it's the output line.

but I guess they've got R receive because that's the that's the labeling on the other end. Anyway, transmit here T which comes in and this comes to the ADC. so I guess they're named based on the phone end and then we've got some filtering. ADC and uh, the transmit shift register.

All this sort of digital side all goes off to your uh uh, microcontroller. so there you go. Very nice little chip does some pretty Advanced uh filtering DAC ADC Allinone custom design for these um, uh, you know PCM type phone applications and they got some really nice descriptions here that are worth reading. and here we go to digitize Intelligible Voice Requires signal to Distortion ratios of 302b over a dynamic range of about 40.

This may be accomplished using a linear 13bit ADC and Dack Well, you know that's a pretty hefty uh Dack So uh, what? They do excess performance per data sample. Two methods of data reduction are implemented by compressing the 13bit linear scheme to compress pseudo logarithmic 8bit schemes. So there you go. the two comp in schemes: Mu Law 255 primarily that's North American Standard and a law used in Europe So all those into your phone systems will know exactly what I'm talking about.

But yeah, and it goes on and on. So this is rather interesting reading. and this big beast that all these codecs feed into here I Mean you know, good luck getting data on that I Suspect had a very quick look. uh, nothing popped up.

So yeah, like there's no manufacturer. Probably some sort of Uh custom uh cell device custom As6 Something like that combining all the individual voice streams into. Um, you know, something that the uh, main processor and everything else can actually manage and the rest of it. There's another custom Asic chip here.

it's got a different number on it. there's another ROM so that's probably another some sort of process or something like that. We' got some system memory over here. Um, curiously, we' got a big uh, super cap here.

plus we've got a battery backup. so real time clock. So the super cap maybe I don't know. Designed to, uh, keep the processor running so it can shut down gracefully.

Who knows. And there's the wave soldon arrow for all the dip. Parts They put them through the wave soldon. not going to bother to take this board out.

There could be some surface mount stuff on the bottom, don't know. But anyway, yeah, the uh as always, the direction of Arrow shows which way this board should travel through the wave solder machine. So there you go. That's what's inside a main.

P BX controller that controls four uh, sorry, eight different uh phones with uh, four incoming Lines by the looks of it. So let's now go have a look at that voice processor which presumably uh, attaches to this system is all part of one big Uh system optional. Of course, you don't have to get the voicemail service, but let's take a look at that. There's going to be some digital recording in that sucker.

Now for the TVP 100 voice processing system: KX TVP 100 Oh, exciting. So let's lift the hood on this sucker. and uh, once again, uh, cabling on here. and Z hey dead spider, there we go.

Yes, like all products, this one has bugs. There's not much in the way of, uh, cable access. We got two ports here on each of these, uh, cards in here. an empty module slot here.

Not sure what's uh, supposed to go in there. There's no, uh, cable, uh, gland holes for the cables to come up or anything like that. So maybe that's just some sort of other management or some board. maybe that sits in between those or something like that.

But see, these are nice. These come out as little two card modules. Look at that. Really, quite neat.

Um, got some surface mount stuff double-sided load and we got all our usual uh line interface stuff there I Don't see any um, uh, huge protection devices in there, so presumably they're not going to outside lines just connected to the other device internal and this is all just held together by our uh headers. so let's whip that apart. There we go. So we got a line interface board.

uh oh yeah. There's a couple of, uh, couple of little uh, neon lamps in there. So bit of protection there, but like nothing. No big gas discharge tubes for lightning strikes and things like that.

so obviously only internal connection, uh, through to the other unit. We've got some sort of custom processor up here. It's got some. Well, it may not be a processor, it may just be something.

it's got some memory attached to it. but yeah, don't even bother looking for the part number for that. There's some sort of uh interface board which takes the uh data stream and uh, encodes it and decodes it. Um, because you got to, uh, not only uh, not only record The Voice coming in, you got to play it back as well on on command.

So all of the uh, voice, and uh, data and uh, and all the Control Data goes through here. Hello! that looks for all the world, like like a hard drive. Aha, have they forgotten to erase their stuff? Who knows, We may have all the company's phone calls. Oops, Classic.

Check it out. Uh, Tashiba 5V IDE interface uh, notebook hard drive H could still read that although you've got to expect it to be a proprietary uh encoding scheme. It's not like they're you know, running Windows and this is going to be like a fat uh file system or or something like that. probably I don't know, but it would be worth, uh, hooking up just to see if it was actually readable.

and I guess with hindsight, Well, the hard drive is the only thing that made sense I Was hoping that uh, you know we'd be able to get um, you know, some really big ass, uh, digital recording Hardware in here, but you can't beat uh, you know, a consumer hard drive for uh, you know, bang per buck in terms of that storage. So really not surprising. So there's not going to be anything too huge in here. No, in fact, oh, it's boring as well.

Sorry to disappoint, but that's all she wrote. Really? yeah, it's all the Magic's in the hard drive. We got this looks like that same 16bit Tashiba processor again and we got the robins for that. Another custom chip up here which once again has the uh oh, there's a live spider, live spider, he's he's over there.

he just ran here we go I'll provoke him, he just ran under there. but yeah, there all his cobwebs so he's in there somewhere. Look at that and the only thing interesting here is this uh Mt 8952 It's a Hdlc, uh, protocol controller and it's basically um, formatting data in the X25 uh format. nothing fancy.

look 96 vintage 38th week so nothing. uh, you know, that's pretty much it. Not a huge amount of stuff and you'll notice that uh, this, um, micro custom, uh as or cell device over here also has that uh, debugging emulator interface over here. so obviously you know, designed for, uh, they would solder on on the development boards during that prototyping and development.

and uh, debugging. they solder headers on there and then they'd be able to tap in there and emulate that chip and you'd leave it off and then you can tap right into it. Excellent stuff. you got to design that stuff in, otherwise you know it's a real dog to to do these.

It's an essential requirement back in the day before. Well, everything's got an in circuit serial programming head of these days. but hey, for these types of things, no way. Jose that's the only way to do it.

And last, and maybe least we have ourselves an NEC Zen Alpha So this one's uh, very curious. You know there's like a Main's cord going into it and uh, basically, uh, you know, Jack all. there's one cable port and that's it. It's an empty box and something rattles inside.

Got ourselves some uh, um, SLA batteries there H They would have seen better days, no doubt. But anyway, out they come and uh, what else. phone cord and some sort of interface board no idea what that's doing and metal plates. yeah, this thing's just been hacked.

There's a Serial sort of uh port and a couple of plug-in boards. and well, yeah, there's a whole bunch of line stuff down here. This is an interesting hotch poch. actually.

there's you know, not as well sort of designed or thought out as the other ones, really. But anyway, we got some line stuff happening over here. presumably. yeah, there's the Co again.

so we've got the uh, the yeah, we got Co1 CO2 and then St ST1 through St6 external speaker. Uh, maybe that's for a PA thing or something like that. Yeah, or this could be an entirely separate uh unit. Perhaps nothing to do with the Panasonic system? maybe? Oh yeah, I was able to get like the uh spec sheet for this thing and yeah, it seems to be like a complete PX solution.

Nothing to do with the Panasonic and the manual is just as hotch poch as the Uh as the design in here look. you know, they' sort of nonsymmetrical and everything's just s of, you know, random connectors placed all over the place. and I don't know. it's these vertical Riser boards.

It's all about how you're doing. Not that impressed. Anyway, yeah, it's like got a couple of uh uh Mainline inputs. no gas discharge tubes there that I can see anyway.

so uh, not nearly as much, uh, filtering. Not nearly as much line protection as we saw on the uh Panasonic anyway. but uh yeah, I don't know. this one's just a bit crusty and these boards are all over the shop.

but this is something, uh, familiar. There you go Hatachi H8s So you know, um, you know, that's uh, pretty familiar IDT 57201 And you know we got some serious flash happening there. and uh, you know that's yeah, who knows what that board does. and then there's a whole bunch of other boards.

Look at these. I mean yeah, what? This one's got battery back up. Oh yeah, we could go to town, but nothing hugely interesting happening in here. So that's a oh, that's a, um, that's a co uh expansion one.

uh, or was that this one? No, here we go. this is the Co expansion one so it gives you a couple of extra uh lines so you know me. Nothing exciting I don't know we're seeing or before in the Panasonic is that a Tamara What is that? I don't know Google that part number I Doubt you'll find anything but obviously. uh, some sort of main system processor something like that.

And here's what I'm talking about. uh, salvaging Parts there's an excellent 3 wat isolated DC to DC converter 24 volts in plus - 12 volts out. uh, 3 Watts You definitely NAB that and that's the thing with these boards. If you got the room, you would just keep all these boards in a box.

So if you're desperately short of a part on a weekend you know, and the electronic Shop's closed, or you're working at midnight or something, you definitely need a uh, you know, a 200 volt 33 mic electrolytic cap. Yeah, it's old, but you could rip that out and reuse it. So there you go. I Won't go into any more detail on this uh NEC unit.

Video's probably gone long enough, but there's a a look inside. a couple of typical Pabx uh systems that you'll find in a business. you know, quite old ones. sort of.

you know, 10 15 year old sort of. uh, voice systems. but typically these stay in place for a long time. So they probably bought these 10 years ago and uh, installed them and they've been using them for a decade.

um, ever since. So you know only now that they've moved. or maybe they have upgraded. maybe the you know, moving to all VoIP uh based systems or something like that.

H Who knows. But yeah, old school PA is not too old. old school. but you know, relatively that um, sort of.

of. you know, mid to late '90s 2000 type vintage technology anyway I hope I like you like that tear down. there are some highes photos of this uh, they're always Linked In on the Eev blog.com uh website and my little uh drop cam camera has been recording this so maybe I'll actually uh, try and extract the uh data from that and uh uh, you know you can have a look at that I'll post that on my alt Zone Channel if I do that, certainly won't go on this. uh main Channel but hope you enjoyed it.

Catch next time.