PT7A4410 Datasheet, PDF (12/34 Pages) List of Unclassifed Manufacturers – T1/E1/OC3 System Synchronizer

Data Sheet
PT7A4410/4410L
T1/E1/OC3 System Synchronizer
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Table 6. Manual Operation Mode
Input Control
State
MS2 MS1 RSEL GTi
0
0
0
0
0
0
0
1
0
0
1
X
0
1
0
X
0
1
1
X
1
0
X
X
Fr ee-Run
S0
S1
S1
S2
/
/
-
Nor mal
(PRI)
S1
-
-
S2 TIE
S1H
/
S0
Nor mal
(SEC)
S2
S1 TIE
S1 TIE
-
/
S2H
S0
Holdover
(PRI)
S1H
S1
S1 TIE
S2 TIE
-
/
S0
Holdover
(SEC)
S2H
S1 TIE
S1 TIE
S2 TIE
/
-
S0
Legend: -: No change
/: Not valid
TIE: State change occurs with TIE Corrector circuit.
Refer to figure 6 for state changes to and from Auto-Holdover state.
Figure 7. Diagram of State Change in Manual Mode
S0
Free-Run
(10X)
S1
Normal
Primary
(000)
S1A
IR _{Auto-Holdover}
Primary
(000)
S2A
Auto-Holdover ^IR
Secondary
(001)
S2
Normal
Secondary
(001)
GTi=1
GTi=0
S1H
Holdover
Primary
(010)
S2H
Holdover
Secondary
(011)
Notes:
(xxx): (MS2 MS1 RSEL)
IR: Invalid Reference Signal
: Phase re-alignment
: Phase continuity maintained without TIE Corrector
: Phase continuity maintained with TIE Corrector
* Movement to Normal State from any state requires a
valid input signal.
PT0106(09/02)
12
Ver:0