MITS Janus Time Engine
Page 38 of 39
Copyright© Instrumentation Technology Systems 2020
20200929
Function
Parameter
Specification
Notes
IRIG B12x
Input
AM modulated time code stream is a transformer isolated,
600 Ω input impedance. Synchronization to this input is
highly dependent on the signal quality, p-p amplitude of the
carrier at the destination and accuracy of the receiving time
code decoder. If B120-123 is applied, the YYYY value must
be entered manually and between 1 second ticks.
IRIG B00x
Input
DC level shifted (DCLS) TTL time code stream is shall be a
TTL compatible input having an output impedance of 50Ω.
MJTE will attempt to synchronize the time master rollover to
the one second marker within 300 ±150 nanoseconds when
chosen as the preferred time reference.
If B000 to B003 is applied, the YYYY value must be entered
manually and between 1 second ticks.
This input can be configured to accept either a single ended
or differentially driven input. The MJTE can be configured
to synchronize to the rising or falling edge of the time
markers
1PPS Input
This input shall be a TLL pulse per second stream where the
pulse width shall be not less than 10 µsec and no more than
500 µsec.
The synchronization may be programmed to align to the
rising or falling edge of the 1PPS input.
This input can be configured to accept either a single ended
or differentially driven input. The MJTE can be configured
to align to the 1PPS or the inverted 1PPS signal.
Optional GPS
Receiver
A GPS receiver may be purchased that will track up to 12
satellites and provide weeks, hours, minutes, seconds and
1PPS data for use by the MJTE.
IRIG B127 out
Time code transformer isolated, 600 Ω output impedance.
Drives up to 100 meters of 50Ω coax. The output is
adjustable (programmable) form 1-9.9 Vp-p output. Time
code is compliant with IRIG B127.
IRIG B 007
out
Time code is compliant with IRIG B007. One second
marker is coincident with the time master ±30 nanoseconds.
Drives up to 10 TTL loads up to 100 meters over 50Ω coax.
Physical output is configurable to be single ended or
differential drive and deliver pulses with the rising or falling
edge coincident with the time master one second rollover.
