doc frame types

git-svn-id: https://svn.spreadspace.org/mur.sat@423 7de4ea59-55d0-425e-a1af-a3118ea81d4c

1 files changed, 25 insertions, 1 deletions

diff --git a/doc/protocols/ground-rxtx.txt b/doc/protocols/ground-rxtx.txt
index 96dd7fb..49d006b 100644
--- a/doc/protocols/ground-rxtx.txt
+++ b/doc/protocols/ground-rxtx.txt
@@ -240,9 +240,28 @@ Content Types Bit Field:
 BC2P is the Bernhard Christian Patrick Protocol
 
 
+Frame Types:
+* [Dn] Data Frame
+* [RS] Reed Solomon FEC Frame, carrying FEC Data for previous N (configurable via DFpRS) data frames
 
+variable DFpRS ratio: If too many frame errors are encountered, the ration can be increased up to 1:1,
+                      respectively if no errors are encountered it can be set to 1:inf (i.e. switch of FEC Frames)
+                      Note that in AX.25 Mode, where a TNC may just discard frames with bad CRC without forwarding it to the PC,
+                      this may not a very helpful FEC mode and should thus be switched off.
+                      Thankfully, GENSO operates it's TNCs in FlexNet Mode and thus get's the raw AX.25 frames which it stores as recieved.
 
-Open Questions:
+variable FrameLength:   should be configured depending on encountered fading.
+                        i.e. should be very small in the beginning and can be increased for more throughput,
+                        once it is clear that satellite rotation (source of rapid fading) is slow enough.
+
+Possible Frame Sequence with DFpRS 1:3 (meaning 1 in 3 errornous frames can be corrected):
+
+...[D1][D2][D3][RS][D4][D5][D6][RS]...
+
+
+
+
+"document this" TODO:
 * frame bits !!
 * maximum Frame length ????
 * think it through..
@@ -252,3 +271,8 @@ Open Questions:
 * Layers ?
 * ...
 
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