Artesyn ATCA-8310 Installation and Use (May 2014) - Manual (Page 95)

Functional Description
ATCA-8310 Installation and Use (6806800M72E) 95
4.6.1 Oscillator
The ACS8520B is clocked by an external 12.80MHz oscillator. This means that the Free-run and
Holdover stability is determined by the oscillator quality.
The following Oscillator is used:
CMACStratum 3, E2747, 3.3V
Figure 4-9 Telco Clock Structure Continued

TO11: MFrSync (2kHz)
Zone3
TO10: FrSync (8kHz)
TO5: (77.76MHz)
TO3: (32.768MHz)
TO4: (25MHz)
TO9: T4 (1.544/2.048MHz)
TO1: (6.48MHz)
TO6: DS3_CLK
(34/44/51MHz)
ACS 
8520B 
ADM
I11
166.7Hz
166Hz
3x DSP-FPGA
3x DSP-FPGA
TO2: (16,384MHz)
TO2: (16.384MHz)
TO7: RTM_CLK_TO7