Nokia 7705 - Page 246

System Management
246
Basic System Configuration Guide
3HE 11010 AAAC TQZZA Edition: 01
Table 28 lists the 1 pulse/s signal (1pps) support and Time of Day messaging
support per platform.
For incoming IEEE 1588 packets, the destination IP address is the 7705 SAR-M,
7705 SAR-H, 7705 SAR-Hc, 7705 SAR-A, 7705 SAR-Ax, 7705 SAR-W,
7705 SAR-Wx, or 7705 SAR-X loopback address. The ingress interface can be an
SFP Ethernet port on the faceplate of the chassis, an RJ-45 port on the faceplate of
the chassis, or a port on an installed module.
Each PTP slave clock can be configured to receive timing from up to two PTP master
clocks in the network. If both master clocks are available, the slave clock uses default
BMCA to determine which of the two master clocks it should synchronize.
PTP messaging between the PTP master clock and PTP slave clock is done over
UDP/IP using IPv4 unicast mode with a fixed IP header size. Unicast negotiation is
supported. Each PTP instance supports up to 128 synchronization messages per
second.
PTP recovered time accuracy depends on the delay of the forward path and the
reverse path being symmetrical. It is possible to correct for known path delay
asymmetry by using the ptp-asymmetry command for PTP packets destined for the
local slave clock or downstream PTP slave clock.
Table 28 1pps/ToD Message Support
1pps Out ToD Messages Out 1pps In ToD Messages In
7705 SAR-8 with
CSMv2
YesNoNoNo
7705 SAR-A Yes Yes for IP PTP
No for Ethernet PTP
No No
7705 SAR-Ax Yes Yes for IP PTP
No for Ethernet PTP
No No
7705 SAR-H Yes Yes for IP PTP
No for Ethernet PTP
No No
7705 SAR-M Yes Yes for IP PTP
No for Ethernet PTP
No No
7705 SAR-X Yes Yes for IP PTP
No for Ethernet PTP
No No