Commtech's Fastcom Product Support Blog

This is the second recent firmware update to the FCore.

• FSCC Family = FCore version 9.09
• SuperFSCC Family = FCore version 4.11

This fixes another small bug in XSync mode.  If you turned on zero or one insertion in XSync mode, it was not only doing the insertion to the data or payload (intended) but it was also bit insertion the opening and closing flags (bug).  This prevented (for example) correctly being able to receive and transmit HDLC frames while in XSync mode as it would bit-stuff the opening HDLC flag.  In this example the HDLC flag 0x7E (0111 1110) would end up getting bit stuffed and would end up like this:  0111 1101 0.

This bug would have affected anyone who had a sync or term character that had 5 or more contiguous one bits (like: 0xFF or 0x3E).

Note: as of the date of this post, this is considered the current, shipping firmware unless otherwise noted.

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