GRASS VALLEY IQUCP25, User Manual

Page: 182 / 338

182
MADI Processing SDC
Histogram Panel
Histogram Panel
When
Details
has been set, the Histogram provides a graphical representation of the
distribution of differences between the card's clock and the PTP grandmaster clock. Every
time the clock difference is recalculated, the relevant bar is incremented. A correctly
Message Timeouts Increments if none of the following are received within any 2-
second period:
follow_up
delay_resp
sync
announce
Clock Steps Back If the IQUCP25/50 receives a time earlier than the last, this
counter is incremented. This could be because of a fault with
the grandmaster, or because there are multiple grandmasters
in the system.
Clock Blips This increments if the local clock offset is >300ns, <-300ns.
Delay Blips This increments if the network delay is >120%, or <80% of the
previous value.
Correction Blips Uses the
correctionField
in the header of
delay_resp
message from the grandmaster.
From IEEE1588 13.3.2.7: "The
correctionField
is the value of
the correction measured in nanoseconds and multiplied by
65536. For example, 2.5 ns is represented as 0x28000.
Increments if the
correctionField
is > 40000 (0.61ns).
FollowUp OoS Errs Increments for every
follow_up
message that is out of
sequence.
FollowUp ID Errs Increments for every
follow_up
message that is not from the
expected clock.
Response OoS Errs Increments for every
delay_response
message that is out of
sequence.
Response ID Errs See Histogram Panel on page 182.
Item Description