PT7A4410 Datasheet, PDF (13/34 Pages) List of Unclassifed Manufacturers – T1/E1/OC3 System Synchronizer

Data Sheet
PT7A4410/4410L
T1/E1/OC3 System Synchronizer
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Table 7. Automatic Operation Mode (MS1 MS2=11, RSEL=0)
Input Control
State
LOS2 LOS1
GTi
1
1
X
X
0
0
X
0
1
0
1
0
0
1
1
1
1
X
RST
0 to 1
1
1
1
1
1
Fr ee-Run
S0
-
S1
S1
S2
S2
-
Nor mal
(PRI)
S1
S0
-
-
S1H
S2 TIE
S1H
Nor mal
(SEC)
S2
S0
S1 TIE
S1 TIE
-
-
S2H
Holdover
(PRI)
S1H
S0
S1
S1 TIE
-
S2 TIE
-
Holdover
(SEC)
S2H
S0
S1 TIE
S1 TIE
S2 TIE
S2 TIE
-
Legend: -: No change
/: Not valid
TIE: State change occurs with TIE Corrector circuit.
Refer to figure 7 for state changes to and from Auto-Holdover state.
Figure 8. Diagram of State Change in Automatic Mode
(11X) RST=1
(11X)
Reset
(X0X)
S1
Normal
Primary
(X0X)
(X0X)
S0
Free-Run
(X0X)
IR
S1A
Auto-Holdover
Primary
(011)
(01X)
(01X)
(01X)
S2A
IR
Auto-Holdover
Secondary
S2
Normal
Secondary
(X01)
(X0X)
(010 or 11X)
(011)
(X0X)
(010 or 11X)
(011)
(11X)
(X00)
S1H
Holdover
Primary
S2H
Holdover
Secondary
(11X)
(01X)
(010 or 11X)
Notes:
(xxx): (LOS2 LOS1 GTi)
IR: Invalid Reference Signal
: Phase re-alignment
: Phase continuity maintained without TIE Corrector
: Phase continuity maintained with TIE Corrector
(11X)
* Movement to Normal State from any state requires a
valid input signal.
PT0106(09/02)
13
Ver:0