zl30102 Zarlink Semiconductor, zl30102 Datasheet - Page 16

• Manufacturer Part Number: zl30102
• Description: T1/e1 Stratum 4/4e Redundant System Clock Synchronizer For Ds1/e1 And H.110
• Manufacturer: Zarlink Semiconductor

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 2.13 µs.
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REF
Output
Clock
REF
Output
Clock
REF
Output
Clock
REF
Output
Clock
Phase
Phase
Phase
holdover_drift
mode_change
10 changes
= 10 x (200 ns + 13 ns) = 2.13 µs
TIE_CLR=0
Normal mode
Phase drift in Holdover mode
Return to Normal mode
= 0.1 ppm x 2 s = 200 ns
= 0 ns + 13 ns = 13 ns
HMS = 0
Figure 9 - Timing Diagram of Hitless Mode Switching
Zarlink Semiconductor Inc.
ZL30102
16
REF
Output
Clock
REF
Output
Clock
REF
Output
Clock
REF
Output
Clock
TIE_CLR=0
Return to Normal mode
Normal mode
Phase drift in Holdover mode
HMS = 1
Data Sheet