Symmetricom XLi IEEE 1588 PTP Master or Slave PRI/SEC/STBY, PTP Slave Synchronization Threshold

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PTP Master or Slave (PRI/SEC/STBY)

Configures the PTP node as a PTP master or slave and determines its role as a reference source:

•PTP MASTER - the IEEE 1588 card gets its time from the XLi IEEE 1588 Clock and functions as a PTP master on the timing network.

•PTP SLAVE PRI - the IEEE 1588 card functions as a PTP slave on the timing network and operates as a primary reference source to the XLi IEEE 1588 Clock.

•PTP SLAVE SEC - the IEEE 1588 card functions as a PTP slave on the timing network and operates as a secondary reference source to the XLi IEEE 1588 Clock.

•PTP SLAVE STBY - the IEEE 1588 card functions as a PTP slave on the timing network but does not operate as a reference source to the XLi IEEE 1588 Clock.

See “F74 – Clock Source Control” on page 77 for more information about reference sources.

IMPORTANT: If one of the PTP slaves on the timing network is a Symmetricom IEEE 1588 card, the interval for all PTP masters and PTP slaves must be set to 2 SECONDS.

PTP Slave Synchronization Threshold

Sets the synchronization threshold for the PTP slave to lock to the PTP master, determining whether the F130 parameter SLAVE CLOCK SYNCHRONIZED reports LOCKED or UNLOCKED. Use the 5 microsecond setting for timing networks that traverse approximately 2 hubs or switches. Try the 1000 microsecond setting if the PTP slave is having difficulty synchronizing or remaining synchronized on timing networks with the following characteristics:

•Multiple layers of hubs and switches

•Routers

•Heavy or bursty network traffic levels

The default factory setting is “5 microseconds”.1

PTP Preferred Master Configuration

PTP slaves synchronize with PTP masters that have the preferred master setting enabled versus those that don’t. Enable this setting to ensure that PTP slaves remain synchronized to a particular PTP master or set of PTP masters.

The default factory setting is “Disable”.

Keypad (plus factory defaults and settings)

Guidelines for using the keypad:

•Use the left/right arrow keys to position the cursor

•Use the up/down arrow keys to change a value or select an option.

1.On the keypad display interface, this setting is only displayed when PTP CLOCK CONFIG is set to SLAVE.

122 XLi IEEE 1588 Clock

997-01510-03, Rev. C, 12/12/2006