User's Guide Part 1

Table Of Contents
Chapter 2: System hardware PTP-SYNC unit
The pinouts of the PTP-SYNC unit GPS/SYNC IN port are specified in Table 39.
Table 39
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)
Signal polarities
A 1 PPS timing datum is detected when GPS_1PPSA goes positive relative to GPS_1PPSB. A
serial data start bit is detected when GPS_RXDA (or GPS_TXDA) goes positive relative to
GPS_RXDB (or GPS_TXDB).
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