User's Guide Part 1

Chapter 2: System hardware PTP-SYNC unit
There are two timing inputs to the PTP-SYNC unit: GPS/SYNC IN (RJ-45) (Table 37) and 1PPS IN
(SMA) (Table 38).
Table 37
PTP-SYNC unit timing specifications - GPS/SYNC IN (RJ-45)
Category
Specification
Signal type Differential 1 Hz signal
Common mode range –7 V to +7 V, relative to GPS/SYNC IN pin 2 (ground)
Maximum differential voltage ±5 V
Threshold ±0.4 V
Impedance 90 ohms to 110 ohms
Pulse width 1 μs to 500 ms
Polarity Reference edge is when pin 3 (PPSA) is positive with
respect to pin 6 (PPSB)
Table 38
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 1μs to 500ms
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