Keysight EXG and MXG X-Series Signal Generators User’s Guide 15Signal Generator OverviewRear Panel Overview (N5171B, N5172B, N5181B, & N5182B)Digital Modulation Connectors (Vector Models Only)I OUT, Q OUT, OUT, OUTBB TRIG 1 & BB TRIG 2EVENT 1OUT and OUT, require Option 1EL.Connector Type: female BNC Impedance: 50 ΩDC–coupledSignalI OUT The analog, in–phase component of I/Q modulation from the internal baseband generator.Q OUT The analog, quadrature–phase component of I/Q modulation from the internal basebandgenerator.OUT Used in conjunction with the I OUT connector to provide a balanced a baseband stimulus.a. Balanced signals are signals present in two separate conductors that are symmetrical relativeto ground, and are opposite in polarity (180 degrees out of phase).OUT Used in conjunction with the Q OUT connector to provide a balanceda baseband stimulus.Damage Levels > 1 Vrms DC OriginOffsettypically <10 mVOutput Signal Levels into a 50 Ω Load— 0.5 V pk , typical, corresponds to one unit length of the I/Q vector— 0.69 V pk (2.84 dB), typical, maximum crest factor for peaks for π/4 DQPSK,alpha = 0.5— 0.71 V pk (3.08 dB), typical, maximum crest factor for peaks for π/4 DQPSK,alpha = 0.35— Typically 1 V p–p maximumConnector female BNC Impedance nominally 50 ΩSignal Reserved for arbitrary and real-time baseband generators I/O, such as markers or trigger inputs.Connector female BNC Impedance: nominally 50 ΩSignal A pulse that can be used to trigger the start of a data pattern, frame, or timeslot.Adjustable to ± one timeslot; resolution = one bitMarkersEach Arb–based waveform point has a marker on/off condition associated with it.Marker 1 level = +3.3 V CMOS high (positive polarity selected); –3.3 V CMOS low (negativepolarity selected).Output on this connector occurs whenever Marker 1 is on in an Arb–based waveform (see“Using Waveform Markers” on page 203).Damage Levels < −4 and > +8 VI QI QIQ
