MT9044 Ver la hoja de datos (PDF) - Mitel Networks

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MT9044

T1/E1/OC3 System Synchronizer

Mitel Networks 

MT9044

master clock may have a temperature coefficient of

±0.1ppm per degree C. So a 10 degree change in

temperature, while the MT9044 is in Holdover Mode

may result in an additional offset (over the

±0.05ppm) in frequency accuracy of ±1ppm, which

is much greater than the ±0.05ppm of the MT9044.

The other factor affecting accuracy is large jitter on

the reference input prior (30ms to 60ms) to the

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 before network synchronization is

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.

Advance Information

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