Ant	High performance antenna for challenging EMI environments. Available with GPS option only.
DC	DC Operation: Requires the unit to be powered from a DC source exclusively, typically +12 to +35 VDC.
ESE	ESE Time Code Input. Cannot be ordered with the IRIG input.
GPS	GPS Receiver. An internal GPS receiver and LCD menu synchronization option are added.
IRIG	IRIG-A/B/G input plus IRIG-B Analog & TTL outputs. Cannot be ordered with the ESE Time Code input.
NTP	NTP Time Server. NTP Time Server output & Network Control input via Ethernet (10/100Base-T, RJ-45).
NTP-C	NTP Client: NTP Client Displays synchronize exclusively with an NTP server (replaces all standard inputs).
OCXO	OCXO: Provides an Oven Controlled Crystal Oscillator.
RS	RS-232C output of GPS receiver. Motorola Binary Format, Position/Status/Data Message once per second. Available with GPS option only.
UL	"UL" Approved Power Supply: The unit is supplied with a UL/CSA approved wall mount power supply.