System Management
7210 SAS D, E, K OS Basic System Configuration Guide Page 195
Synchronizations Option available on 7210 SAS platforms
The following table lists the synchronization options on various 7210 SAS platforms:
Synchronization Status Messages (SSM)
Note: Synchronous status messages are supported only on 7210 SAS-D and 7210 SAS-K devices.
The SSM provides a mechanism to allow the synchronization distribution network to both
determine the quality level of the clock sourcing a given synchronization trail and to allow a
network element to select the best of multiple input synchronization trails. Synchronization Status
messages have been defined for various transport protocols including SONET/SDH, T1/E1, and
Synchronous Ethernet, for interaction with office clocks, such as BITS or SSUs and embedded
network element clocks.
SSM allows equipment to autonomously provision and reconfigure (by reference switching) their
synchronization references, while helping to avoid the creation of timing loops. These messages
Table 21: Synchronizations Option available on 7210 SAS-E, D, and K platforms
Platform 7210 SAS-E 7210 SAS-D 7210 SAS-K
SyncE with SSM (SFP and 10G/
XFP ports)
Not Supported Supported (only on
7210 SAS-D ETR)
Supported on
both 7210 SAS-K
(non-ETR and
ETR)
SyncE with fixed Copper ports
(Master/Slave support)
Not Supported Supported only on
fixed copper port
(only on 7210 SAS-
D ETR). Both
Master and Slave
option supported
Supported on
both 7210 SAS-K
(non-ETR and
ETR)
1588v2/PTP with Port-based
timestamps (both for frequency &
time – also known as PTP pure
mode)
Not Supported Not recommended
for use
OC and BC slave
is supported on
both 7210 SAS-K
(non-ETR and
ETR).
1588v2/PTP with Port-based
timestamps (time only with SyncE
used for frequency recovery – also
known as PTP hybrid mode)
Not Supported Supported only on
7210 SAS-D ETR.
Only PTP hybrid
mode recommended
for use
Supported
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