Nokia 7210 Configuration Manual page 299

7210 SAS-M, T, R6, R12, Mxp, Sx, S Basic System
Configuration Guide
3HE 17358 AAAB TQZZA
• When changing the clock-type to or from a boundary clock on the
7210 SAS-Mxp, 7210 SAS-R6, 7210 SAS-R12, 7210 SAS-Sx 1/10GE, and
7210 SAS-T platforms, the node must be rebooted for the change to take effect.
Nokia recommends taking appropriate measures to minimize service disruption
during the reboot process.
• On the 7210 SAS-M, use of PTP and SyncE as a reference simultaneously is
not allowed. Either SyncE or PTP can be configured as a reference, but not both
together.
• The 7210 SAS-Mxp, 7210 SAS-R6, 7210 SAS-R12, 7210 SAS-Sx 1/10GE, and
7210 SAS-T support the use of PTP and SyncE as a reference simultaneously;
that is, on these platforms, the ref-order can be set to config>system>sync-if-
timing>ref-order ref1 ref2 ptp.
• The 7210 SAS-M, 7210 SAS-Mxp, 7210 SAS-R6, 7210 SAS-R12,
7210 SAS-Sx 1/10GE, and 7210 SAS-T support the PTP hybrid mode of
operation. Frequency recovery is provided by the central clock through either
SyncE or BITS, depending on which reference is configured. PTP is used for
time recovery only. In this mode, the node can recover very stable frequency
using a reduced PTP packet rate.
• The 7210 SAS-M uses CPU processing cycles for frequency and time recovery.
Use of PTP hybrid mode reduces the amount of CPU processing cycles needed,
helping customers scale better.
• To enable PTP hybrid mode on the 7210 SAS-Mxp, 7210 SAS-R6,
7210 SAS-R12, 7210 SAS-Sx 1/10GE, and 7210 SAS-T, run the
config>system>ptp>clock>freq-source ssu CLI command. To enable pure
PTP mode, the user must execute the command
config>system>ptp>clock>freq-source ptp.
For a change of value from ssu to ptp (or vice-versa) to take effect, the operator
must save the configuration changes and reboot the node.
• On the 7210 SAS-R6 and 7210 SAS-R12, only the BITS1 port can be used to
provide a reference to the system clock or to distribute the reference. The use
of the BITS2 port is not supported.
• On the 7210 SAS-T and 7210 SAS-Mxp, both the BITS1 and BITS2 ports can
be used to provide a reference to the system clock or to distribute the reference.
• On the 7210 SAS-M, Nokia strongly recommends using PTP in hybrid mode
only. Hybrid mode facilitates reduced PTP packet rates and improved scalability.
Use subject to Terms available at: www.nokia.com
© 2021 Nokia.
System Management
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