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ZL30105 Datasheet(PDF) 15 Page - Zarlink Semiconductor Inc

Part No. ZL30105
Description  T1/E1/SDH Stratum 3 Redundant System Clock Synchonizer for AdvancedTCA and H.110
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Maker  ZARLINK [Zarlink Semiconductor Inc]
Homepage  http://www.zarlink.com
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ZL30105 Datasheet(HTML) 15 Page - Zarlink Semiconductor Inc

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ZL30105
Data Sheet
15
Zarlink Semiconductor Inc.
Figure 10 - Timing Diagram of Hitless Mode Switching
Examples:
HMS=1: When ten Normal to Holdover to Normal mode transitions occur and in each case the Holdover mode was
entered for 2 seconds then the accumulated phase change (MTIE) could be as large as 330 ns.
-
Phaseholdover_drift = 0.01 ppm x 2 s = 20 ns
-
Phasemode_change = 0 ns + 13 ns = 13 ns
-
Phase10 changes = 10 x (200 ns + 13 ns) = 330 ns
REF
Phase drift in Holdover mode
HMS = 0
Normal mode
Return to Normal mode
REF
Output
Clock
REF
Output
Clock
REF
Output
Clock
Phase drift in Holdover mode
Normal mode
Return to Normal mode
Output
Clock
REF
Output
Clock
REF
Output
Clock
HMS = 1
TIE_CLR=0
REF
Output
Clock
TIE_CLR=0
REF
Output
Clock


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