Table 15: Timing Port Pinouts
1PPS (Input and Output)
10 MHz (Input and Output)
Input—Rectangular pulse
Output—Rectangular pulse
Input—Sine wave
Output—Square wave
Waveform
Input— > 2.4 volts TTL compatible
Output— > 2.4 volts TTL compatible
Input— > 1.7 volt p-p(+8 to +10 dBm)
Output— > 2.4 volts TTL compatible
Amplitude
50 ohms
50 ohms
Impedance
26 microseconds
50% duty cycle
Pulse
Width
40 nanoseconds
Input—AC coupled
Output—5 nanoseconds
Rise Time
Time-of-Day Port Pinouts
This table summarizes the ToD/1-PPS port pinouts:
Table 16: RJ-45 ToD/1-PPS Port Pinouts
Description
Direction
Signal Name
Pin
–
–
–
1
–
–
–
2
1PPS RS422 signal
Output or Input
1PPS_N
3
–
–
GND
4
–
–
GND
5
1PPS RS422 signal
Output or Input
1PPS_P
6
Time-of-Day character
Output or Input
TOD_N
7
Time-of-Day character
Output or Input
TOD_P
8
USB Port Pinouts
This following table summarizes the USB port pinouts:
Table 17: USB Port Pinouts
Description
Signal Name
Pin
+5 VDC
Vcc
A1
Cisco Network Convergence System 540 Large Density Routers Hardware Installation Guide
71
Appendix
Time-of-Day Port Pinouts
