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Chapter 4. Status
4-8 MX2800 STS-1 User Manual 61200659L1-1
TIMING STATUS
The following entries describe the state of the transmit timing
subsystem, including the status of the selected reference clock(s),
availability and status of the external clock sources, timing
acquisition status, and internal clock failures.
Clock Status
This entry describes the condition of the clock synchronization
circuitry. The clock status can be any of the following values:
•
N
ORMAL
– clock synchronization is operating normally.
•
R
ECOVERING
– clock synchronization is in the process of
recovering from a fault.
•
L
OSS
OF
S
OURCE
– the reference clock source has become
invalid
•
O
UT
OF
R
ANGE
– the clock synchronization circuit is unable to
track the reference source.
•
O
UT
OF
L
OCK
– the clock synchronization circuit is unable to
lock to the reference source.
Current Source
Indicates the source of the clock. The values for the clock source
are:
•L
OOP
–
indicates that timing is currently being derived from the
STS-1 receive signal.
•
PRI E
XT
– indicates that timing is currently being derived from
the source assigned to the primary external clock source.
•
SEC E
XT
– indicates that timing is currently being derived from
the source assigned to the secondary external clock source.
•F
REE
-
RUN
– indicates that transmit timing is currently being
derived from an internal +/-20 ppm (Stratum 4) SONET
minimum clock source.