Differences

This shows you the differences between two versions of the page.

--- packet:reading_traces [2024/04/18 12:14] – created 2e0itb
+++ packet:reading_traces [2025/06/07 20:41] (current) – formatting 2e0itb
@@ Line 1: / Line 1: @@
+====== Reading AX.25 Traces ======
+Often in packet radio you will see output like this:
+{{:packet:sample-trace.png?400|}}
 AX.25 2.2 packets are either "commands" or responses".  Commands can have a "P" poll bit set, and responses will echo that back as an "F" final bit.
-  * SABM (Set Asynchronous Balanced Mode) - Creates a new AX.25 2.0 connection.
+  * C is often used for SABM (Set Asynchronous Balanced Mode) - Creates a new AX.25 2.0 connection.
   * SABME (Set Asynchronous Balanced Mode Extended - Creates a new AX.25 2.2 connection.
   * RR (Receive Ready) - I'm ready to receive more data.
@@ Line 23: / Line 30: @@
    - The first field is the frame type.
-   - The second field is "C" for control, or "R" for response.
+   - The second field is "C" for control message, or "R" for response message.
-   - The third field is "P"/"F" for poll/final, or omited if not set.
+   - The third field is "P"/"F" for poll/final, or omitted if not set.
-   - R# means "I have received all packets before #."
+   - S# means "This packet has sequence number #."
-   - S# means "This is packet sequence number #."
+   - R# means "I have received all packets before sequence number #."
+====Additional reading====
+{{ :packet:bpqterminal_frames.pdf |}}
+{{ :packet:decifering_packet_frame_headers.pdf |}}
+{{tag>frame frames traces}}