MT9044 Mitel Networks Corporation, MT9044 Datasheet - Page 10

• Manufacturer Part Number: MT9044
• Description: T1/E1/OC3 System Synchronizer
• Manufacturer: Mitel Networks Corporation

MT9044
master clock may have a temperature coefficient of
temperature, while the MT9044 is in Holdover Mode
may result in an additional offset (over the
is much greater than the 0.05ppm of the MT9044.
The other factor affecting accuracy is large jitter on
the reference input prior
mode switch. For instance, jitter of 7.5UI at 700Hz
may reduce the Holdover Mode accuracy from
0.05ppm to 0.10ppm.
Freerun Mode
Freerun Mode is typically used when a master clock
source is required, or immediately following system
power-up
achieved.
In Freerun Mode, the MT9044 provides timing and
synchronization signals which are based on the
master clock frequency (OSCi) only, and are not
synchronized to the reference signals (PRI and
SEC).
The accuracy of the output clock is equal to the
accuracy of the master clock (OSCi). So if a 32ppm
output clock is required, the master clock must also
be 32ppm. See Applications - Crystal and Clock
Oscillator sections.
10
0.1ppm per degree C. So a 10 degree change in
0.05ppm) in frequency accuracy of 1ppm, which
before
network
(30ms to 60ms) to the
synchronization
is
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