Take,
we can indeed agree that transmitting an hash key could be better than to
send a full call sign.
Anyway when you transmit an hash key you miss the possibility for receivers
to go back to the original information unless they decode a complete
sequence of messages.
With FT8 or with all the other modes implemented in WSJT-X you don't need
to listen to a complete message sequence in order to understand the source
and the destination of a message.
Such a property is not shared by the hashing scheme I've seen at the
beginning of this thread.
If you miss msg #1 and/or msg #2 you have no way to understand the origin
and/or the destination of the other four messages.
This is not a big problem in telephone and internet networks, where
actually this is an advantage, but it is an issue if you would like to
mantain the decodability of anything you receive at the single message
level.
Can you recover the complete caller or destination address of a message
from a single message of a DHCP/HLR/VLR message sequence?
I guess no.
Furthermore what is an area code in HF communications? Is something we can
rely on to abbreviate our callsign and say to eavesdroppers "Hey, look! I'm
NWV and I'm calling from Italy" ?
I guess no again.
This is the problem we have to face with, not just encoding hashes in FT8
as done in DHCP or in anything else:
Is it acceptable that anybody on the band, besides the caller and the
recipient, has no way to understand who is sending something to someone
else just because he missed part of the QSO?
73
Nico / IV3NWV
2018-09-06 4:41 GMT+02:00 Tsutsumi Takehiko <ja5...@outlook.com>:
> Nico,
>
>
>
> It sounds Igor’s proposal as futuristic but the callsign abbreviation and
> subscriber profile exchange practice via control signal plane can be seen
> anywhere in network protocols. Internet example is DHCP protocol, which
> makes the connection possible more than 4,294,967,296 devices with IPv4
> 32-bit address limitation. If you remember old telephone system, you do
> not need to dial full 15 digit telephone numbers which ITU defines if you
> want to connect to other party within area code or city code. If you
> demand subscribers to dial 15 digits with rotary dial telephone at call
> setup, how long do they spend? I am sure it will be longer than one FT8
> sequence. Subscriber profile exchange on control signal plane is similar if
> you look into HLR/VLR specification of cellular networks.
>
>
>
> Does FT8 live in Titanic age or after telephone and Internet age?
>
>
>
> Regards,
>
>
>
> take
>
>
>
> de JA5AEA
>
>
>
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________
wsjt-devel mailing list
wsjt-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/wsjt-devel
