Wireshark-bugs: [Wireshark-bugs] [Bug 5635] Create a ETSI TETRA dissector for wireshark
Date: Mon, 31 Jan 2011 07:30:52 -0800 (PST)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=5635

--- Comment #14 from Harald Welte <[email protected]> 2011-01-31 07:30:50 PST ---
Unfortunately the TETRA spec has no ASN.1 in it.  It simply describes its
encoding rules and then gives textual tables of the information elements and
their ordering.

It is my understanding that the staff at the Beijing Institute of Technology
which has manually converted those tables into ASN.1 and then applies PER
unaligned. encoding rules.

I'm not sure why the TETRA specs don't give ASN.1 by themselves.  Possibly
because they predate PER unaligned? Or maybe because they simply wanted to
leave more work to the implementors and keep unwanted competition out?

Motorola has published an IEEE paper on how they implemented TETRA, and they
went the route of designing a domain-specific language and re-typing the tables
from the TETRA spac in that DSL.

Regards,
Harald

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