*
* 7 6 5 4 3 2 1 0
* +----+----+----+----+----+----+----+----+
- * | B | E | C=0|seq. (high 4 bits) | EA |
+ * | B | E | C=0|seq. (high 4 bits) | EA |
* +----+----+----+----+----+----+----+----+
* | sequence (low 8 bits) |
* +----+----+----+----+----+----+----+----+
- * | DLCI (6 bits) | CR | EA |
+ * | DLCI (6 bits) | CR | EA |
* +----+----+----+----+----+----+----+----+
* | DLCI (4 bits) |FECN|BECN| DE | EA |
* +----+----+----+----+----+----+----+----+