Spectracom TSync-PCIe - Table 6-1: IRIG Input Reference Formats

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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 supports synchronization with the following analog and DCLS IRIG input

formats:

A – DCLS A – AM B – DCLS B – AM G – DCLS G – AM

A000 A130 B000 B120 NA NA

A001 A131 B001 B121 G001 G141

A002 A132 B002 B122 G002 G142

A003 A133 B003 B123 NA NA

A004 A134 B004 B124 NA NA

NA NA NA NA G005 G145

Table 6-1:

IRIG Input Reference Formats

The TSync-PCIe supports the IRIG B variant NASA36 as an input format, as well as the IEEE

C37.118-2005 (which is an IRIG B format with extensions as an input format). The IEEE

C37.118-2005 specification supersedes IEEE 1344-1996. The TSync-PCIe is backward com

patible to IEEE 1344-1996 by compliance with IEEE C37.118-2005.

The board can automatically detect IRIG formats A, B, G, and NASA36. However, IRIG format

IEEE1344, coded expression, and control field information cannot be auto-detected.These must

be specified by the user if these inputs are to be used.

NOTE – Always configure IRIG parameters in the following order: format, coded

expressions, control field definitions.

In operation, the TSync-PCIe board receives IRIG input data and any time code messages trans

mitted, performs signal conditioning on the data, and decodes the data per its manually set

parameters and automatically detected functions. In turn, the board provides a serial time code

data message and a 1PPS reference. It also returns the IRIG input message’s raw serial time

code data in Spectracom’s data format. (This is useful in debugging serial time code source

and hardware implementations.)

The TSync-PCIe module also accepts as input any non-standard IRIG format generated by the

Spectracom Netclock, including the non-standard BCDYEAR found in the Control field. This is

6.1 Input References

CHAPTER 6 • Instruction Manual XYZ Rev. R