ZL30409_06 Datasheet, PDF (14/32 Pages) Zarlink Semiconductor Inc – T1/E1 System Synchronizer with Stratum 3 Holdover

ZL30409
Data Sheet
Description
State
Input Controls
Freerun
Normal
(PRI)
Normal
(SEC)
MS2 MS1 RSEL PCCi
S0
S1
S2
0
0
0
0
0
0
0
1
0
0
1
X
0
1
0
X
0
1
1
X
1
0
X
X
S1
-
S1 MTIE
S1
-
S1 MTIE
S2
S2 MTIE
-
/
S1H
/
/
S2H
S2H
-
S0
S0
Legend:
-
No Change
/
Not Valid
MTIE State change occurs with TIE Corrector Circuit
Refer to Control State Diagram for state changes to and from Auto-Holdover State
Table 4 - Control State Table
Holdover
(PRI)
S1H
S1
S1 MTIE
S2 MTIE
-
/
S0
Holdover
(SEC)
S2H
S1 MTIE
S1 MTIE
S2 MTIE
/
-
S0
S0
Freerun
(10X)
S1
Normal
Primary
(000)
S1A
{A}
Auto-Holdover
Primary
(000)
S2A
Auto-Holdover
{A}
Secondary
(001)
S2
Normal
Secondary
(001)
(PCCi=0)
(PCCi=1)
S1H
Holdover
Primary
(010)
S2H
Holdover
Secondary
(011)
NOTES:
(XXX) MS2 MS1 RSEL
{A}
Invalid Reference Signal
Movement to Normal State from any
state requires a valid input signal
Phase Re-Alignment
Phase Continuity Maintained (without TIE Corrector Circuit)
Phase Continuity Maintained (with TIE Corrector Circuit)
Figure 7 - Control State Diagram
14
Zarlink Semiconductor Inc.