Cisco Cisco ONS 15454 SONET Multiservice Provisioning Platform (MSPP) 故障排查指南
and is timing from its own internal clock, the timing source must be within the timing tolerance for a
minimum of 24 hours.
minimum of 24 hours.
Table 1 – Clock Accuracy
Stratum
Accuracy
Adjustment
Range
Pull-In-
Range
Stability
Time
To First
Frame
Slip
1 1 x
10-11
NA
NA
72 days
2 1.6 x
10-8
Must be
able to
synchronize
to clock
with
accuracy of
+/-1.6 x 10-
8 1 x
able to
synchronize
to clock
with
accuracy of
+/-1.6 x 10-
8 1 x
10-
10/day
10/day
14 days
3E 4.6 x
10-6
Must be
able to
synchronize
to clock
with
accuracy of
+/-4.6 x 10-
6 1 x
able to
synchronize
to clock
with
accuracy of
+/-4.6 x 10-
6 1 x
10-8/day 17 hours
3 4.6 x
10-6
Must be
able to
synchronize
to clock
with
accuracy of
+/-4.6 x 10-
6 3.7 x
able to
synchronize
to clock
with
accuracy of
+/-4.6 x 10-
6 3.7 x
10-7/day
23
minutes
minutes
SONET
Minimum
Clock 20
x
Minimum
Clock 20
x
10-6
Must be
able to
synchronize
to clock
with
accuracy of
+/-20 x 10-
6
able to
synchronize
to clock
with
accuracy of
+/-20 x 10-
6
Not
specified
specified
Not
specified
specified
4E 32 x
10-6
Must be
able to
synchronize
to clock
with
accuracy of
+/-32 x 10-
6
able to
synchronize
to clock
with
accuracy of
+/-32 x 10-
6
Same as
Accuracy
Accuracy
Not
specified
specified
Must be
Page 3 of 44
Cisco - ONS 15454 Timing Issues
12/29/2004
http://www.cisco.com/warp/customer/127/Timing/15454_timingissues.html