DXD8/PTP User Manual (rev 2.15)
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3. Reference & Sync Menus
Installing the PTP option will affect some of the menus and offer new choices. Please refer to the DXD-8 manual for instructions
on how to navigate through the menus and how to change some of the settings..
3.1 REFERENCE MENU (MENU 1.1)
A new choice is available in the reference menu after installing the PTP option: PTP Mode.
•
PTP Mode
is a little different than other references. Selecting PTP Mode is required for the
DXD-8 to become a PTP slave, i.e. be ‘referenced’ to a PTP Grandmaster. However, selecting
PTP Mode also means that the DXD-8 will participate in the selection process of the PTP
Grandmaster and, depending on the outcome of the BMCA, the DXD-8 will either be a PTP
Slave or the Grandmaster (see 9.5 for more on the BMCA). Explanatory text has been added
to the REFERENCE menu when PTP Mode is activated.
NOTE: When PTP Mode is selected, the PTP port needs to be turned on (menu 5.1). If not, the DXD-8 will lock to its internal
crystal and a ‘PTP
NO
PORT’ warning message will appear in the middle of the display. The LOCK bar at the bottom of the
Main Rotation display will also indicate NO PORT (for more information, see chapter 14.1 Troubleshooting).
•LOCAL REF WHEN GM:
When PTP Mode is selected , if GPS is available, this fields enables GPS to be set as the reference when the DXD-8 is the
Grandmaster. Enabling this field will announce the DXD-8 as GPS referenced, giving it a higher priority at being selected by the
BMCA.
This field only appears if the optional DXD/GPS receiver has been installed.
3.2 SYNC PARAMETERS (MENU 1.2)
New parameters are available in this menu with the PTP options.
•
BNC INPUT TIME JAM SOURCE:
Selects the source of a Time Jam (see 5.2).
•
BNC INPUT TIME JAM RESYNC:
Used for a manual Time Jam (see 5.2)
•
PTP
JUMP THRESHOLD:
When the difference between the internal TOD and the PTP reference is above the value entered,
the DXD will not attempt a smooth transition (slew) but will instead jump instantly to the new time.
Value can be adjusted from 5 msec to 15 sec, or set to ‘Never’. Default value is 5
msec.
4. PTP Menus
4.1 PORT MODE (MENU 5.1)
This menu allows you to have PTP enabled or disabled. Choices are ‘on’ and ‘off’.
With the port enabled, the DXD-8 automatically becomes a candidate for PTP Grandmaster. Keep in mind however that it’s
ability to be a PTP slave depends on the reference selection in menu 1.1:
-
MASTER/SLAVE: if ‘PTP Mode’ is selected, the DXD-8 can become a PTP slave.
-
MASTER-ONLY: if another reference is selected, the DXD-8 can only be a PTP master, not a PTP slave.
NOTE: When the port is enabled and a reference other than ‘PTP Mode’ is selected menu 1.1, if the BMCA selects another
unit as PTP Grandmaster, the port will automatically go in the PASSIVE state.
