4. HOW TO USE
30
4.7
LTC Signal I/O
LTC on the rear panel receives and outputs time codes and outputs alarms.
On the LT 4448,
time codes are called LTC1 to LTC3.
Pin
No. Pin Name I/O
Pin
No. Pin Name
I/O
1
GND
-
14
LTC1-_P
I
2
LTC1+_P
I
15
LTC1-_O
O
3
LTC1+_O
O
16
LTC1-_B
I
4
LTC1+_B
I
17
LTC2-_P
I
5
LTC2+_P
I
18
LTC2-_O
O
6
LTC2+_O
O
19
LTC2-_B
I
7
LTC2+_B
I
20
LTC3-_P
I
8
LTC3+_P
I
21
LTC3-_O
O
9
LTC3+_O
O
22
LTC3-_B
I
10
LTC3+_B
I
23
GND
-
11
GND
-
24
GPI_P_O
O
12
GPI_P
I
25
GPI_B_O
O
13
GPI_B
I
● Time Code I/O
Apply the primary signal to LTC1 to 3+_P and LTC1 to 3-_P and the backup signal to LTC1
to 3+_B and LTC1 to 3-_B.
Depending on the front-panel SYNC SOURCE setting, the primary or backup signal is
transmitted from LTC1 to 3+_O and LTC1 to 3-_O.
Switching method between the primary signal and the spare signal is electronic switch.
● Alarm output
Apply the primary signal to GPI_P and the backup signal to GPI_B. They are passed
through to GPI_P_O and GPI_B_O, respectively.