Cisco Systems ASR 903 manual GPS Port Pinout, Time of Day Port Pinout

Chapter 5 Troubleshooting

Pinouts

Table 5-1		BITS Port Pinout (continued)
Pin	Signal Name		Direction	Description
6				Not used
7				Not used
8				Not used

GPS Port Pinout

Table 5-2summarizes the GPS port pinouts.

Table 5-2	GPS Port Pinout
		10 Mhz (input and output)	1PPS (input and output)
Waveform		Input—Sine wave	Input—Pulse shape
		Output—Square wave	Output—Pulse shape
Amplitude		Input— > 1.7 volt p-p	Input— > 2.4 volts TTL
		(+8 to +10 dBm)	compatible
		Output— > 2.4 volts TTL	Output— > 2.4 volts TTL
		compatible	compatible
Impedance		50 ohms	50 ohms
Pulse Width		50% duty cycle	26 microseconds
Rise Time		Input—AC coupled	40 nanoseconds
		Output—5 nanoseconds

Time of Day Port Pinout

Table 5-3summarizes the ToD/1PPS port pinout.

Table 5-3		RJ45 1PPS/ToD Port Pinout
Pin	Signal Name		Direction	Description
1	1PPS_P		Output or Input	1PPS RS422
				signal
2	1PPS_N		Output or Input	1PPS RS422
				signal
3	RESERVED		Output	Do NOT connect
4	GND
5	GND			Time of Day
				character
6	RESERVED		Input	Do NOT connect

Cisco ASR 903 Router Hardware Installation Guide

5-2 OL-25178-04