Basic System Configuration Guide System Management
Edition: 01 3HE 11010 AAAC TQZZA 245
6.4.6.7 PTP Ordinary Slave Clock for Time of Day/Phase Recovery
The following equipment supports PTP slave clock for time of day/phase recovery:
• all fixed platforms listed in Table 25
• all cards listed in Table 26
The 7705 SAR can receive and extract time of day/phase recovery from a 1588
grand master clock or boundary clock and transmit the recovered time of day/phase
signal to an external device such as a base station through an external time of day
port, where available. The PTP slave clock can be used as a reference for the router
system time clock, providing high-accuracy OAM timestamping and measurements
for the following equipment:
• 7705 SAR-8
• 7705 SAR-18
• 7705 SAR-A
• 7705 SAR-Ax
• 7705 SAR-H
• 7705 SAR-Hc
• 7705 SAR-M
• 7705 SAR-W
• 7705 SAR-Wx
• 7705 SAR-X
On the 7705 SAR-8 CSMv2, 7705 SAR-A, 7705 SAR-Ax, 7705 SAR-M, and
7705 SAR-X, transmission is through the ToD port with a 1 pulse/s output signal that
is phase-aligned with other routers that are similarly time of day/phase synchronized.
An RS-422 serial interface within the ToD port connector communicates the exact
time of day of the rising edge of the 1 pulse/s signal. The serial interface on the ToD
out port and the ToD in port on the CSMv2 are currently not supported; therefore, the
7705 SAR-8 does not support Time of Day messages.
On the 7705 SAR-H, transmission is through the IRIG-B Out port. An RJ-45 interface
is used for the IRIG-B Out port to communicate the exact time of day by the rising
edge of the 1 pulse/s signal, an IRIG-B000 unmodulated time code signal, and an
IRIG-B12X modulated time code signal.
This Time of Day message output is only available when the router is configured with
an active IP PTP slave clock or boundary clock. It is not available when Time of Day
is recovered from an Ethernet PTP clock or integrated GNSS.
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