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AVOD, How Does It Work?  
User currently offlineReadytotaxi From United Kingdom, joined Dec 2006, 3183 posts, RR: 2
Posted (5 years 6 months 3 days 22 hours ago) and read 7628 times:

Is the system a computer/server type thing with movies and audio stored on a hard disk?
Is it that simple?  Yeah sure


you don't get a second chance to make a first impression!
13 replies: All unread, jump to last
 
User currently offlineTristarSteve From Sweden, joined Nov 2005, 3978 posts, RR: 34
Reply 1, posted (5 years 6 months 3 days 21 hours ago) and read 7616 times:

Yes the movies and audio are stored on a server.
And no its not simple!
When you select a movie, the whole movie is downloaded to the box under your seat. This is how you can stop and start your movie separate from other pax.
The problems arise from all the interactions from other systems. Like when a PA is made, it stops all the movies. On the handset there are controls for movies, and for reading light and call bell which is completely different system, part of the aircraft, not the AVOD.
And loads of aircraft are still flying with non-AVOD systems, where the movies are on Hi-8 tapes which you can see at the purser station.
Biggest problems are the handsets and underseat boxes. Passengers are prone to pulling the handset out of the armrest, and kicking the boxes. Disturb the wrong plug on a seat box and the whole row can go down.
But yes a computor is at its heart, and power off and restart cures a lot of problems!


User currently offlineSP90 From United States of America, joined May 2006, 388 posts, RR: 0
Reply 2, posted (5 years 6 months 2 days 20 hours ago) and read 7407 times:

Why not put the local boxes under the passenger floor instead of under seats. That way the person behind won't be able to kick at it. I'm also curious as to what type of hard disk are used. The constant vibration of flight ops cannot be good for regular spinning hard disk drives.

User currently offlineA10warthog From United States of America, joined Jul 2004, 324 posts, RR: 0
Reply 3, posted (5 years 6 months 2 days 17 hours ago) and read 7383 times:

The seat boxes come from the seat manufacture already installed. Plus you would need access panels all over you floor boards. Easy access is the key and I can tell you even the now some seat boxes are a pain to get to.

User currently offlineGeotrash From United States of America, joined Jun 2001, 326 posts, RR: 0
Reply 4, posted (5 years 6 months 2 days 17 hours ago) and read 7378 times:

Interesting, I always wondered the same thing so thanks for asking the question and thanks to folks for posting what they know. Like most things in aviation, the state of the installed base appears to be well behind the state of the art because of the long cycle times of systems from design to certification and testing.

Thanks to cheap flash memory, virtualization and thin client systems, I can envision that the next gen AVOD systems might eliminate the box under the seat or at least make it wallet sized, eliminating the problem.

Anyone know the technical details of the AVOD systems- OS, hardware, etc.?

Dave


User currently offlineA10warthog From United States of America, joined Jul 2004, 324 posts, RR: 0
Reply 5, posted (5 years 6 months 2 days 15 hours ago) and read 7339 times:



Quoting Geotrash (Reply 4):
Thanks to cheap flash memory, virtualization and thin client systems, I can envision that the next gen AVOD systems might eliminate the box under the seat or at least make it wallet sized, eliminating the problem.

Already there, well almost. On the EX2 system if you have a DSEB seatbox, which is most common in your coach and Biz seat, they are thinner than most guys wallets and only a little bigger than a CD case. The reason why is because the brains of each seat is the monitor. The DSEB is a router, that connects the seat monitor to the ADB (Area Distribution Box), which are located in the ceiling. The ADB connects to the CEC, (Central equipment center) where your servers are located.


User currently offlineSP90 From United States of America, joined May 2006, 388 posts, RR: 0
Reply 6, posted (5 years 6 months 2 days ago) and read 7187 times:



Quoting A10warthog (Reply 5):
Already there, well almost. On the EX2 system if you have a DSEB seatbox, which is most common in your coach and Biz seat, they are thinner than most guys wallets and only a little bigger than a CD case. The reason why is because the brains of each seat is the monitor. The DSEB is a router, that connects the seat monitor to the ADB (Area Distribution Box), which are located in the ceiling. The ADB connects to the CEC, (Central equipment center) where your servers are located.

How very interesting. So the monitor in the seatback in really like a Tablet PC almost. If that is the case then surely it can handle the additional task of routing as well thus eliminating the CD sized, wallet thin thingy altogether. Perhaps in the next product release? Thanks for the insight.


User currently offlineA10WARTHOG From United States of America, joined Jul 2004, 324 posts, RR: 0
Reply 7, posted (5 years 6 months 1 day 22 hours ago) and read 7148 times:



Quoting SP90 (Reply 6):
So the monitor in the seatback in really like a Tablet PC almost. If that is the case then surely it can handle the additional task of routing as well thus eliminating the CD sized, wallet thin thingy altogether. Perhaps in the next product release?

Maybe, it would have to change the way the system works right now. I guess it is possible, but it would take more wiring and I think would have to have one monitor in the seat group being the router. You have to take in account that you have two ethernet wires running from the ADB down to you floor or sidewall disconnect. From there you hook up to your first seat and then Daisy chain through your DSEB to wherever your column ends. I would say normally 6 to 7 seats.

But I just fix the system, I do not design them.


User currently offlineReadytotaxi From United Kingdom, joined Dec 2006, 3183 posts, RR: 2
Reply 8, posted (5 years 6 months 1 day 21 hours ago) and read 7137 times:

Thanks everyone for the input.  Smile


you don't get a second chance to make a first impression!
User currently offlineNycbjr From United States of America, joined Aug 2007, 447 posts, RR: 0
Reply 9, posted (5 years 6 months 1 day 21 hours ago) and read 7135 times:



Quoting Geotrash (Reply 4):
AVOD systems- OS

the one's that i have seen on DL are linux, always amuses me when IC the system rebooted and the Penguin shows up  Smile

oh I'm a linux sysadmin so maybe that's why it amuses me  Silly


User currently offlineTdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 10, posted (5 years 6 months 1 day 5 hours ago) and read 7042 times:



Quoting SP90 (Reply 2):
Why not put the local boxes under the passenger floor instead of under seats.

In addition to the access problems, the underfloor area is *very* cramped. Besides the floor beams, you've got tons or wire bundles running in that area that can't easily be moved or disturbed. Above the center wing tank, you may have as little as 1-2" of clearance between the bottom of the floor panel and the top of the wing.

Also, there are certification requirements regarding smoke migration from the cargo hold to the passenger compartment, so you'd have to put a seal on each and every one of the pass-throughs between the boxes and the seats, which is certainly possible but not something I suspect anybody wants to do.

Tom.


User currently offlineA10WARTHOG From United States of America, joined Jul 2004, 324 posts, RR: 0
Reply 11, posted (5 years 6 months 22 hours ago) and read 6993 times:



Quoting Tdscanuck (Reply 10):
Above the center wing tank, you may have as little as 1-2" of clearance between the bottom of the floor panel and the top of the wing.

I forgot about the clearance issue. I hate having to work the floor disconnects over the center tank.


User currently offlineDocLightning From United States of America, joined Nov 2005, 19389 posts, RR: 58
Reply 12, posted (5 years 6 months 21 hours ago) and read 6978 times:



Quoting SP90 (Reply 2):
Why not put the local boxes under the passenger floor instead of under seats. That way the person behind won't be able to kick at it.

1) They'd be sticking into the cargo compartment where shifting cargo (or shifting rampers) could damage them.

2) How you supposed to fix one without crawling under the floor?

3) What about those ones over the wing spar?

I think the newer systems don't have an under-seat box anymore, the entire thing can fit into the seatback. It's still pretty amazing that it works at all.


User currently offlineA10WARTHOG From United States of America, joined Jul 2004, 324 posts, RR: 0
Reply 13, posted (5 years 6 months 19 hours ago) and read 6953 times:



Quoting DocLightning (Reply 12):
It's still pretty amazing that it works at all.

I takes times and some cases a big headache.


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