Tellabs 6325 - Page 58

58 MA365 • Rev. A2
Tellabs
®
6325 Edge Node 3 Reference Information
Synchronization function
in holdover mode
The following table describes the specifications for the synchronization func-
tion in holdover mode.
Change of clock
source
EN 300417-1 The change-over of synchronization
from one source to another (each
traceable to the same PRC) shall be
performed so that the resultant fre-
quency/phase change is compliant
with the MRTIE mask (constraint by
disturbances) given in EN 300 462-5.
The transition between synchroniza-
tion sources may introduce a phase
transient which may result in the
generation of AU/TU pointer ad-
justments but should not introduce
bit errors
Jitter
Jitter transfer
function
EN 300 462-5 Gain < 0.1 dB, Clock bandwidth 1 to
10 Hz
Parameter Reference SETG output
Parameter Reference SETG output
Frequency Stability
Memorized frequency
resolution
Tellabs 0.025 ppm
Frequency offset EN 300 462-5 +/- 4.6 ppm end of life
Frequency offset on en-
try into holdover.
implicit G.813, EN 300
462-5
+/- 0.05 ppm
Frequency drift over
temperature
EN 300 462-5 +/- 2.0 ppm
Phase stability MRTIE
Long term phase tran-
sient response
EN 300 462-5 figure 7 • S>15s: (a
1
+ a
2
)S +
0.5bS
2
+ c [ns]
•a
1
=50 ns/s (initial
frequency offset
(0.05ppm)
•a
2
=2000 nS/S ac-
counts for tempera-
ture variations
(2ppm)
• b=1.16x10
-4
ns/s
2
accounts ageing
(0.01 ppm/day)
• c=120ns