Avp14m Incorrect Length -
Context: The identifier AVP14M refers to a specific Application Process within the Inmarsat-C satellite network. Inmarsat-C is a packet-switched data communication system used globally by merchant vessels for safety communications (GMDSS), Long-Range Identification and Tracking (LRIT), and Ship Security Alert Systems (SSAS).
The AVP14M application is technically defined as the "DNID (Data Network ID) and Member Number Assignment" process. It is utilized by Land Earth Stations (LES) to remotely manage the mobile terminals onboard ships. This process allows the LES to assign, modify, or delete the DNID and Member Number configuration stored in the mobile terminal's Non-Volatile Memory (NVM).
Definition of the Error: The "Incorrect Length" error is a protocol-level failure that occurs when the mobile terminal (the ship’s satellite unit) receives an AVP14M packet where the declared size of the data packet does not match the actual size of the data structure received. avp14m incorrect length
The error avp14m incorrect length is a specific manifestation of a general class of data alignment and protocol consistency bugs. Systematic diagnosis—comparing expected vs. actual lengths, verifying endianness and padding, and checking version compatibility—will resolve the issue. Long-term prevention requires robust serialization practices and version-aware parsing.
Date: October 26, 2023 Subject: Analysis of Incorrect Length Output in AVP14M Operations Report ID: TR-AVP14M-002 Status: Open / Investigation Phase Context: The identifier AVP14M refers to a specific
If possible, enable verbose logging on the host controller or use a logic analyzer to capture the exact transaction. Look for:
The following tests were conducted to isolate the fault: Date: October 26, 2023 Subject: Analysis of Incorrect
| Test ID | Payload Size (Bytes) | Result | Observed Length Field | | :--- | :--- | :--- | :--- | | T-01 | 256 | PASS | 0x0100 | | T-02 | 512 | PASS | 0x0200 | | T-03 | 1023 | PASS | 0x03FF | | T-04 | 1024 | FAIL | 0x0000 | | T-05 | 600 (Fragmented) | PASS | 0x0258 |
Conclusion: The failure is reproducible specifically at the 1024-byte boundary, confirming a buffer overflow logic error.
The standard AVP14M packet structure is defined as:
