5-2
Cisco ASR 903 Router Hardware Installation Guide
OL-25178-05
Chapter5 Troubleshooting
Pinouts
GPS Port Pinout
Table 5 -2 summarizes the GPS port pinouts.
Time of Day Port Pinout
Table 5 -3 summarizes the ToD/1PPS port pinout.
5 TX Tip Output TX Tip
6 Not used
7 Not used
8 Not used
Table5-1 BITS Port Pinout (continued)
Pin Signal Name Direction Description
Table5-2 GPS Port Pinout
10 Mhz (input and output) 1PPS (input and output)
Waveform Input—Sine wave
Output—Square wave
Input—Pulse shape
Output—Pulse shape
Amplitude Input— > 1.7 volt p-p
(+8 to +10 dBm)
Output— > 2.4 volts TTL
compatible
Input— > 2.4 volts TTL
compatible
Output— > 2.4 volts TTL
compatible
Impedance 50 ohms 50 ohms
Pulse Width 50% duty cycle 26 microseconds
Rise Time Input—AC coupled
Output—5 nanoseconds
40 nanoseconds
Table5-3 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
4GND
5 GND Time of Day
character
6 RESERVED Input Do NOT connect