Symmetricom XLi IEEE 1588 User Manual

1

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.

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 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.