Nokia 7210 SAS-Mxp - Using Synchronous Ethernet Timing for T1;E1 MDA; Clock Source Quality Level Definitions

7210 SAS-MXP, R6, R12, S, SX, T BASIC SYSTEM
CONFIGURATION GUIDE RELEASE 22.9.R1
System management
Figure 28: timeReceiver clock
6.5.8 PTP boundary clock for frequency and time
Although IEEE 1588v2 can function across a packet network that is not PTP-aware, performance may
be unsatisfactory and unpredictable. PDV across the packet network varies with the number of hops,
link speeds, utilization rates, and the inherent behavior of routers. By using routers with boundary clock
functionality in the path between the grandmaster clock and the timeReceiver clock, one long path over
many hops is split into multiple shorter segments, allowing better PDV control and improved timeReceiver
performance. This allows PTP to function as a valid timing option in more network deployments and allows
for better scalability and increased robustness in certain topologies, such as rings.
Boundary clocks can simultaneously function as a PTP timeReceiver of an upstream grandmaster
(ordinary clock) or boundary clock, and as a PTP timeTransmitter of downstream timeReceivers (ordinary
clock) and boundary clocks. The time scale recovered in the timeReceiver side of the boundary clock is
used by the timeTransmitter side of the boundary clock. This allows time distribution across the boundary
clock.
The following figure shows routers with boundary clock functionality in the path between grandmaster clock
and the timeReceiver clock.
3HE 18197 AAAB TQZZA
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