ECS4660-28F_Management Guide-R03

C HAPTER 24 | System Management Commands
Synchronous Ethernet
– 988 –
Table 87: show sync - display description for sync
Field Description
SyncE Status
Port Port identifier
Status Shows if SyncE is enabled or disabled
Clock Source Shows if port is configured as a clock source
candidate
SyncE Clock Source Selection Mode Shows the clock source selection method:
◆
Manual – Manual mode (see synce or synce
ethernet command)
◆
Auto – Automatic mode (see synce auto-clock-
source-selecting command)
◆
SSM – Selection based on SSM messages (see
synce clk-src-ssm command)
SyncE Active Clock Source Locked Shows if clock source port is unlocked, or locked by
manual or forced mode configuration
SyncE Clock Source Status
Port Port identifier
Priority The selection priority determined by the manual
configuration or default setting
Active Clock Source Shows if port is currently operating as the port
actively connected to the clock source
Clock Status Shows if the clock signal is valid or not
SyncE SSM Status
Port Port identifier
Status Shows if reception/transmission of SSM is enabled or
disabled
Priority The selection priority determined by the manual
configuration or default setting
Tx SSM Shows transmitted Quality Level message type:
◆
QL-NONE: This port is not transmitting SSM or
timeout information
◆
QL-EEC1: Transmitting QL-EEC1
*
messages
◆
QL-EEC2: Transmitting QL-EEC2* messages
* The performance characteristics of the Phase Lock Loops (PLL) used to receive and
re-transmit frequency synchronization signals in a SyncE chain are governed the ITU-T
G.8262 standard. It defines two possible PLL performance options: Ethernet Equipment
Clock (EEC) Option 1 and 2. EEC Option 1 is based on the 2.048 kpbs hierarchy
governed by G.813 Option 1 which is used in Europe and Asia. EEC Option 2 is based
on the 1.544 kpbs hierarchy governed by G.812 Type IV or Stratum 3 which is
predominantly used in North America.
Rx SSM Shows received Quality Level message type:
◆
QL-NONE: This port is not receiving SSM or
timeout information
◆
QL-DNU: This port is receiving SSM code but has
not been chosen as the clock source port
◆
QL-EEC1: Receiving QL-EEC1* messages
◆
QL-EEC2: Receiving QL-EEC2* messages