Spectracom TSync-PCIe, User Manual

Page: 42 / 61

reference, are also handled accordingly. The system can manage DST transitions set by the user
when running in a local timescale.
6.4 Output References
The output subsystem provides time code and frequency references derived from the input ref
erence. The outputs provided include a single IRIG AM and DCLS output pair, a 10-MHz sine
wave output, and a 1PPS output.
The output subsystem supports setting output offset(s) for each output except the 10-MHz sine
wave output, which can be used to compensate for output cable length delays or downstream
clock accuracy errors. Each output offset can range from -500 msec to +500 msec in 5 or 20-
nsec steps (depending on the type of output).
6.4.1 IRIG Output
The TSync-PCIe board provides one IRIG AM and DCLS pair output. The IRIG output is a rolling
count of the initial value of the system time until synchronized. The board drives the IRIG AM out
put from an associated IRIG DCLS output and outputs the exact same format (except for the AM
modulation).
The TSync-PCIe board supports IRIG outputs with Formats A, B, E and G. It also supports IRIG
outputs using modulation frequency values of pulse width code, also known as DCLS, and sine
wave amplitude modulated coding. It further supports IRIG outputs with frequency/resolution
values of no carrier/index count interval, 100 Hz/10 ms, 1 kHz/1 ms, 10 kHz/0.1 ms, and
100 kHz/10 ms. Coded expressions for the fields BCDTOY, CF, SBS, and BCDYEAR. Are sup
ported, as is IRIG output for the following coded expressions combinations for BCDTOY, CF,
SBS, and BCDYEAR fields:
0 – BCDTOY, CF, SBS
1 – BCDTOY, CF
2 – BCDTOY
3 – BCDTOY, SBS
4 – BCDTOY, BCDYEAR, CF, SBS
5 – BCDTOY, BCDYEAR, CF
The TSync-PCIe board allows the user to select the following Time Code Formats for IRIG output:
A – DCLS A – AM B – DCLS B – AM E – DCLS E – AM G – DCLS G – AM
A000 A130 B000 B120 E000 E110 NA NA
A001 A131 B001 B121 E001 E111 G001 G141
A002 A132 B002 B122 E002 E112 G002 G142
A003 A133 B003 B123 E003 E120 NA NA
32
CHAPTER
6
•
Instruction Manual XYZ Rev. R
6.4 Output References