zl30100 Zarlink Semiconductor, zl30100 Datasheet - Page 14

• Manufacturer Part Number: zl30100
• Description: T1/e1 System Synchronizer
• Manufacturer: Zarlink Semiconductor

Examples:
HMS=1: When 10 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 3.13 Ps.
where:
REF
Output
Clock
-
-
-
-
-
REF
Output
Clock
REF
Output
Clock
REF
Output
Clock
Phase
Phase
Phase
0.15 ppm is the accuracy of the Holdover mode
0 ns is the maximum phase discontinuity in the transition from the Normal mode to the Holdover mode
holdover_drift
mode_change
10 changes
= 10 x (300 ns + 13 ns) = 3.13 Ps
TIE_CLR=0
Normal mode
Phase drift in Holdover mode
Return to Normal mode
= 0.15 ppm x 2 s = 300 ns
= 0 ns + 13 ns = 13 ns
HMS = 0
Figure 8 - Timing Diagram of Hitless Mode Switching
Zarlink Semiconductor Inc.
ZL30100
14
REF
Output
Clock
REF
Output
Clock
REF
Output
Clock
REF
Output
Clock
TIE_CLR=0
Normal mode
Phase drift in Holdover mode
Return to Normal mode
HMS = 1
Data Sheet