Cisco ASR 903, Installation Manual, Page: 172 / 200

Description Direction Signal
Name Pin
Not used — — 6
Not used — — 7
Not used — — 8
GPS Port Pinout
The platform is capable of receiving or sourcing GPS signals of 1 PPS & 10 MHz. These interfaces are
provided by two mini-coax 50-Ohm, 1.0/2.3 DIN series connector on the front panel. Similarly there are two
mini-coax 50-Ohm connectors provided in the front panel to output this 1PPS and 10MHz.
The table below summarizes the GPS port pinouts.
Table 26: GPS Port Pinout
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
Table 27: GPS Port Pinout for ASR 900 RSP3
1PPS (input and output) 10 Mhz (input and output)
Input—Rectangular pulse
Output—Rectangular pulse
Input—Sine wave
Output—Sine and 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
Cisco ASR 903 and ASR 903U Aggregation Services Router Hardware Installation Guide
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Troubleshooting
GPS Port Pinout