Newtec MDM6000 - Transparent BBF over IP

Newtec Proprietary
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Feature Descriptions MDM6000 Satellite Modem
14.14 Transparent BBF over IP
This feature allows to check on invalid baseband frames and forward these frames as BBF over IP
out towards a proper decapsulator that can handle the invalid frames.
When enabled the following is detected:
• CRC-8 Handling Errors: Some malicious user could corrupt the value of the CRC-8 byte and
inject hidden traffic.
A regular demodulator would drop frames with uncorrectable frames, which would then go
unnoticed. A "hacked" demodulator could then be programmed to still output those specific
corrupted frames.
The Transparent BBFoIP option on the MDM6000 will output even the frames that have CRC-8
errors and increment the monitoring parameter "CRC-8 Errors" in order to signal this.
• Non-zero padding bytes: A way to hide data is to use the padding data that should normally
consist of all zeros.
A regular demodulator would strip the zero padding. The Transparent BBF over IP feature allows
you to not strip the zero padding and transparently output it with the rest of the frame. The
monitoring parameter "Non-zero padding" is incremented to signal this.
A particular case in the non-zero padding, is the DFL handling.
Some malicious user could set the DFL (Data Frame Length) to zero but still insert data into the
frames.
The check on the invalid frames is performed in the BBF over IP Out block.
Refer to the following figure:
Proceed as follows:
» Enable the BBF over IP Out block;
» Configure the destination IP Address and destination UDP port;
» Enable Invalid Frames.
(When enabling this feature, baseband frames with CRC-8 Errors and baseband frames with
Non-zero padding are detected and forwarded as BBF over IP out towards the proper
decapsulator.)
When enabled, the BBF over IP packets are to be handled by an external
(non-Newtec) processing equipment. The NOP1760 cannot process the transparent
BBFs.