Chapter 2: System hardware
PTP-SYNC unit
Page 2-43
Category
Specification
Pulse width
1
μ
s to 500 ms
Polarity
Reference edge is when pin 3 (PPSA) is positive with
respect to pin 6 (PPSB)
Table 49 PTP-SYNC unit timing specifications - 1PPS IN (SMA)
Category
Specification
Signal type
1 Hz signal
Pulse
Positive pulse, reference edge is rising edge
Maximum voltage
5 V
Threshold
0.4 V to 0.6 V
Input impedance
45 ohms to 55 ohms
Pulse width
1
μ
s to 500ms
The pinouts of the PTP-SYNC unit GPS/SYNC IN port are specified in
Table 50 GPS/SYNC IN port pinouts
Pin no.
Connector pinout signal name
Signal description
Pin 1
12VGPS
12 V output to GPS receiver module, 250 mA max
Pin 2
GND
Ground
Pin 3
GPS_1PPSA
1 Hz pulse input
Pin 4
GPS_RXDA
GPS receive data
Pin 5
GPS_RXDB
GPS receive data
Pin 6
GPS_1PPSB
1 Hz pulse input
Pin 7
GPS_TXDA
GPS transmit data
Pin 8
GPS_TXDB
GPS transmit data
Note
The GPS_1PPS, GPS_RXD and GPS_TXD signals conform to International
Telecommunication Union (ITU) recommendation V.11 (RS422)