Spectracom TSync-PCIe, Руководство пользователя

Страница: 43 / 61

A – DCLS A – AM B – DCLS B – AM E – DCLS E – AM G – DCLS G – AM
A004 A134 B004 B124 E004 E122 NA NA
NA NA NA NA E005 E125 NA G145
Table 6-3:
IRIG Output Reference Formats
The TSync-PCIe allows the user to select the IRIG B variant NASA36 as an IRIG output. It also
supports user-selection of IEEE C37.118-2005 as an IRIG output. This is an IRIG B format with
extensions. The board is compliant with IEEE 1344-1996 as IEEE C37.118-2005 supersedes this
specification.
The board generates the non- standard IRIG formats that are generated by the Spectracom
Netclock, including the non-standard BCDYEAR. This provides for compatibility with existing
Spectracom NetClock products.
NOTE –
Configuration of IRIG parameters should always be in the following
order: format, coded expressions, control field definitions.
The TSync-PCIe board supports adjustment of the IRIG output amplitude using a scale ranging
from 0 to 255, with 128 being the middle and default value. The adjustment range approx
imates a linear function.
The IRIG outputs provide an offset that can be applied to adjust its relationship with the internal
system 1PPS, from -500 msec to +500 msec in 5-nsec increments
The IRIG outputs provide signature control, which enables and disables outputs under the fol
lowing conditions:
Signature control off — outputs always on.
Signature control enables output when in sync to input reference only
Signature control enables output when in sync to input reference or in holdover
6.4.2 10-MHz Sine Wave Output
The TSync-PCIe board generates a 10-MHz sine wave output from the disciplined on-board
oscillator. The 10-MHz sine wave output provides signature control similar to the IRIG outputs.
6.4.3 1PPS Output
The TSync- PCIe board generates a digital 1PPS output from the internal 1PPS of the
system. Several parameters of the 1PPS can be controlled. The active edge can be set to either
rising or falling edge, the pulse width can be adjusted, and an offset can be applied to adjust
its relationship to the internal system, 1PPS from - 500 msec to +500 msec in 5- nsec
increments. The 1PPS output provides signature control similar to the IRIG outputs.
6.4 Output References
CHAPTER
6
•
Instruction Manual XYZ Rev. R
33