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SyncE - status
The SyncE status is displayed at the bottom of PTP :: Port webpage.
SyncE Status in GM mode
Figure 46 GM SyncE status output on PTP::Port webpage
The above figure is a sample status when EdgeSync is operating as a GM and Port1 is connected to a
SyncE slave and Port2 is not connected to a link partner (link down condition). The following describes
the different fields in this use case:
• SSM channel (ESMC) – it is enabled for both ports.
• Link Mode – This is applicable only for Copper/RJ45. This is as per 802.3 standard which
specifies the physical media and the working characteristics of Ethernet. To work in
conjunction with SyncE, link mode on EdgeSync ports will be (forced) set to master clock and
1000 Mbps full-duplex and auto-negotiation turned off. In the example above, there is a link on
port-1 and its Link Mode set to “master”, while for port-2 there is no link, it shows as “none”.
• Input QL – This is the Quality level in the ESMC message received on that port (from its link
partner).
o For Port1, it indicates AUTO (QL-DNU), and
o For Port2, it indicates AUTO (QL-FAILED)
In GM mode, the input QL processing in EdgeSync is set to AUTO to take the input from the
port and feed it into the PLL as one of the inputs. What is shown in the parentheses is the
actual value received.
• Port1, receives QL-DNU (DNU = do not use) from its link partner.
• Port2, since the link is down, it shows QL-FAILED.
• Output QL – In this use case, the frequency reference is coming from GNSS (or 1pps) and not
from either of the two Ethernet ports. The quality level for that is PRC (or PRS). This QL is
what should be propagated downstream as the EdgeSync is a Grand Master.
o For Port1, the link is up and so the actual QL that is put in the outgoing ESMC message
is QL-PRC as shown in the parentheses.
o For Port2, not that it matters since the link is down, the value that will be put in the
ESMC message will be QL-DNU.
• Active Reference – this will indicate YES or NO to indicate the recovery of frequency on that
Ethernet port. The YES would mean that the frequency is recovered from this port. In a BC
clock mode of operation with SyncE enabled, it will YES on the (slave)port where we get the
frequency reference and NO on the other (master) port. In our sample use case of GM, it will
show NO on both pots as the active reference is from GNSS (1pps) and not from the Ethernet
ports.
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