B	Parallel BCD Output: CMOS compatible, 5-volt logic in parallel four-line format is accessible through a rear-mounted D-sub connector.
Display	.4" LED Display: Six digit 0.4" red LED display for Airborne units.
F	Fuse: A panel mounted fuse is supplied. An internally mounted fuse is standard.
HQ-In	"Have Quick" Time Code Input: Option allows the unit to be synchronized with a "Have Quick" Input and a 1PPS Input. The 1 PPS is required for accuracy. This Option meets the ICD-GPS-060 standard.
SMPTE/EBU	SMPTE or EBU Time Code outputs: SMPTE or EBU Time Code outputs may be specified (not available with IRIG).