Products listed below can be configured as a IEEE-1588/PTP Grandmaster Clock.  Here are the timestamp resolution and accuracy specifications:

Model Timestamp Resolution Timestamp Accuracy to UTC (RMS)
Sonoma (GPS)
Network Time Server
8 nanoseconds 30 nanoseconds
Sonoma (CDMA)
Network Time Server
8 nanoseconds 10 microseconds (typical)
Meridian II
Precision TimeBase
8 nanoseconds 10 nanoseconds
Tycho II
Precision TimeBase
8 nanoseconds 25 nanoseconds