[aprssig] What is "TNC Channel Switching"?

Robert Bruninga bruninga at usna.edu
Fri Apr 11 08:28:18 CDT 2014


The pipe and tilde characters were sensed as a STREAM switch in the
Kantronics dual-band TNC's.
I figured it was good to aovid them so that these TNC's could not get
inadvertently switched into the wrong mode.
Seemed like a good idea at the time.

Bob, WB4APR

-----Original Message-----
From: aprssig-bounces at tapr.org [mailto:aprssig-bounces at tapr.org] On Behalf
Of Andrew Pavlin
Sent: Friday, April 11, 2014 9:23 AM
To: aprssig at tapr.org
Subject: [aprssig] What is "TNC Channel Switching"?

Greetings, all.

I was slogging through the APRS spec, and came upon a mention that the
ASCII characters '|' and '~' were reserved for TNC channel switching, and
couldn't appear in any messages or even as a symbol code.

What does this mean, and is it still applicable? Will I break the APRS-IS
or some ancient TNC somewhere if I send those characters in an APRS
message?

Just curious.

Andrew Pavlin, KA2DDO
Sent from my Verizon Wireless BlackBerry
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