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2.9 Precision Time Protocol (PTP) Card and IEEE1588 v2
The Precision Time Protocol (PTP) card option for the RSG2288 adds the ability
to provide time synchronization via IRIG-B, and to synchronize to an external
IRIG-B source or to the GPS network. The time synchronization capabilities of
the RSG2288, both with and without the PTP card option, are summarized
below:
Synchronization Source
Without PTP
Card
With PTP
Card
NTP
IEEE 1588 v2
IRIG-B PWM
GPS
Table 9: RSG2888 Time Synchronization Sources
Synchronization Service
Without PTP
Card
With PTP
Card
NTP
IEEE 1588 v2
IRIG-B AM
IRIG-B PWM
Table 10: RSG2288 Time Synchronization Services
NTP (Network Time Protocol) is the standard for synchronizing the clocks of
computer systems throughout the Internet and is suitable for systems that require
accuracies in the order of 1 ms.
IRIG-B (Inter Range Instrumentation Group, mod B) time synchronization is an
even older, established, inter-device time synchronization mechanism providing
accuracy on the order of 1ms to 1µs.
The Global Positioning System (GPS), as a source of accurate time, requires an
external GPS antenna input to provide accurate time signals on the order of
500ns. The RSG2288 can use the GPS receiver on the PTP card to provide the
time base for the system.
IEEE 1588 is designed to fill a niche not well served by either of the two older,
dominant protocols, NTP and IRIG-B. IEEE 1588 is designed for local systems
requiring accuracies on the order of 100 nanoseconds. IEEE 1588 is also
designed for applications that cannot bear the cost of a GPS receiver at each
node or for which GPS signals are inaccessible. Every Ethernet port on the
RSG2288 supports IEEE1588.
The PTP card option is an ideal product for use in existing installations already
well served by NTP, IRIG-B or GPS. It also provides a migration path for the use
of the new IEEE 1588 v2 standard. As more end devices enter the market with
IEEE 1588 compatibility this card provides an easy transition to this new time
synchronization standard.
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RSG2288 Installation Guide rev103