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CXR Larus 80-100-400 Issue 2, July 2006 2-9
Table 2-A
T1 Clock Strata Performance
Stratum
Accuracy,
Adjustment
Range
Pull-in Range
Stability
Time to First
Frame Slip
1
x 10
1
-11
/A
N
/A
N
2 days
7
2
1.6 x 10
-8
Must be capable
of synchronizing
to clock with
accuracy of ±1.6
10
x
-8
1 x 10
-10
/day
7 days
3E*
x 10
4
-7
.6 x 10
4
-6
x 10
5
-9
/day
hours
7
3E
1.0 x 10
-6
Must be capable
of synchronizing
to clock with
accuracy of ±4.6
10
x
-6
1 x 10
-8
/day
3.5 hours
3
4.6 x 10
-6
Must be capable
of synchronizing
to clock with
accuracy of ±4.6
10
x
-6
3.7 x 10
-7
/day
6 minutes
(255 in 24 hours)
4E
32 x 10
–6
Must be capable
of synchronizing
to clock with
accuracy of ±32
10
x
-6
Same as
accuracy
Not yet specified
4
32 x 10
-6
Must be capable
of synchronizing
to clock with
accuracy of ±32
x 10
-6
Same as
accuracy
N/A
* CXR Larus-enhanced performance. Performance requirements for the remaining stratum levels (except
Stratum 3E) are taken from ANSI/T1.101-1994, Synchronization Interface Standard for
Telecommunications, and Bellcore GR-1244-CORE, Clocks for the Synchronized Network: Common
Generic Criteria. The Stratum 3E level is defined only by Bellcore.
