Re: tlug: Linux telecom nexus

["A.Tomita" <atomita@example.com>]

At 00:04 98/06/02 +0900, you wrote:
> 	1. In Akihabara and Shinjuku, I haven't seen any of the supported
> 	   boards given as examples (i.e., Hauppauge Win/TV PCI, Miro
> 	   PCTV, STB TV PCI, Diamond DTV2000, Videologic Captivator PCI,
> 	   AVerMedia TV-Phone, Matrix Vision MV-Delta).  However, I have
> 	   seen several boards using the proper chip (Brooktree Bt848).
> 	   
> 	   Where can I buy a board that is known to work?  Has anyone
> 	   tried a local board?  How compatible are they apt to be?

Last month I saw at A-Master (block D3 at the impress' Akiba map)
a Bt848-based board been demonstrated under FreeBSD. I think it
will also work with Linux. 

> 	3. Current boards (e.g., Hauppauge) are around $100 and have
> 	   cool features like decoding various data sent in the VBI.
> 	   The Japanese TV boards are more expensive (around JPY20,000).
> 	   Do they decode similar data?  (Closed-captioning and such?)
> 	   I think it differs from country to country, but it would be
> 	   really trick to have my box scan the captions for keywords.
> 	   Otherwise, I am favoring the cheaper boards without tuners.

They decode "moji housou" (how do you call it in English?), i.e., text
data sent in the interval between frames, with a quality similar to
videotext. Some models can also decode Bitcast signals.

> 	4. Some boards have S-VHS input.  What is the advantage over
> 	   composite video RCA jacks?  (I.e., how much is S-VHS worth?)

S-VHS input means the luminance and crominance signals come separated
(Y-C), giving better quality and more robustness against noise.

> 	2. I think I understand dialing out, but how can I dial-in to
> 	   my box at home via a digital channel?  (E.g., see the Mobile
> 	   Phase below.)  Do I need to rent a second phone number from
> 	   NTT?

One idea I had in mind was to use NTT's called ID service in the
following way:
	
	1) call home from my PHS
	2) my TA (a Zyxel Omni TA128) gets the caller ID and sends
          it over the RS-232C
       3) mgetty identify the number as belonging to my PHS
	4) hang up
	5) mgetty starts a dial-out process that connects to my ISP
       6) upon connection, update the name server entry with DynDNS
       7) and I can access my box from outside

Calls from numbers other than of my PHS would be ignored by mgetty
and handled by my answering machine.

The difficult I found trying to implement the process above was getting
steps 2 and 5 to work. Anyone familiar with mgetty dare to try patching
it?


---
A.Tomita,Jr.   atomita@example.com
               atomita@example.com

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