SSID´s in DPRS

[EA1AXY]

Hi to All ...

In the DPRSInterface doc " Section 3 - Installation Instructions " we read ...

Icom radios running as trackers (GPS mode) should have their callsign set to be callsign-space(s)-SSID. The SSID is in the 8th character position (last character). The SSID may be any letter or number. Due to D-STAR repeater design, do not use A, B, C, D, G, S, zero, or space.

Well ... up to now assumed that more or less :

*A - SHF 1200 REPEATER
*B - UHF  430 REPEATER
*C - VHF  144 REPEATER
*D - DV DONGLE
E
F
*G - GATEWAY REPEATER
H - DPRS GATEWAY ?
I - DPRS GATEWAY ?
J
K
L - LINK Dextra Echo ...
M - MOBILE
N - NODE HOT-SPOT
O
P - PORTABLE 
Q
R
*S - INTERNET SERVICE ?
T
U
V
W
X
Y
Z

*0
1 - MULTIPLE HOME OR
2 - DIGI PORT FREC
3 - =     =    =
4 - =     =    =
-5 - YATCH 
6 - SAT 
7 - PORTABLE 
8 - BOAT 
9 - MOBILE 
10 - INET USE 
11 - BALLON
12 - LARGE TRUCK 

* D-STAR REPEATER DESIGN
DS only in LOGIN of APRS-IS

And with the last WB4APR recommendations :

-0 Your primary station, usually fixed and message capable.
-1 Additional station, digi, mobile, weather station etc.
-2 Additional station, digi, mobile, weather station etc.
-3 Additional station, digi, mobile, weather station etc.
-4 Additional station, digi, mobile, weather station etc.
-5 Network sources (smartphones etc.)
-6 Special activity, e.g. satellite operations, camping, 50MHz etc.
-7 Handheld radios and other human portables.
-8 Boats, RVs or second mobile.
-9 Primary mobile.
-10 Internet gateways, Echolink, Winlink, AVRS, APRN, etc.
-11 Balloons, aircraft, spacecraft, etc.
-12 APRStt, DTMF, RFID devices, trackers etc.
-13 Weather stations.
-14 Truckers or other full time drivers.
-15 Additional station, digi, mobile, weather station etc.

With regard to the SSID formed with numbers, without problems ... but with regard to the SSID formed with letters, does the mess of the APRS begin?, is there some reliable list of which and so that they should be used?

Thank´s

[Pete AE5PL]

SSIDs definitions in APRS date back to when there was no way to define station type in the data (presymbol days).  There are NO restrictions on SSIDs in either APRS or D-STAR.  The recommendation for avoidance in D-STAR was due to some early software restrictions.  However, the Icom G2 gateway software does not let you register numeric SSIDs so those should be avoided.  Zero should be avoided because it does not translate properly (conflicts with space) to D-PRS.

Bottom line: use whatever SSIDs you want to to mean anything you want including meaning nothing other than to differentiate between transmitting stations.  All networkable digital protocols require some method for differentiating endpoints.  In amateur radio protocols, the callsign is a guaranteed unique station group identifier but further differentiation is required for specific endpoints (stations).  In D-STAR, it is the ID character in the eighth position.  In APRS and AX.25, it is the SSID.  Because D-STAR stations can be seen on APRS via D-PRS, any IDs/SSIDs must be unique across those networks for different stations under the same callsign.

Long explanation to say "There are no standards for specific ID/SSID usage with individual stations nor should there be.  Use whatever ID/SSID you want to but remember, they must be unique for different stations under your callsign regardless of digital network they may be on."

73,

Pete AE5PL