Cisco ASR 902 Troubleshooting Manual page 2

GPS Port Pinouts
GPS Port Pinouts
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 2: GPS Port Pinouts
Waveform
Amplitude
Impedance
Pulse
Width
Rise Time
Table 3: GPS Port Pinout for ASR 900 RSP3
Waveform
Amplitude
Impedance
Pulse
Width
Rise Time
Time-of-Day Port Pinouts
To ensure proper signal integrity at the receiver, we recommend that you use a 50-ohm termination, as shown
in the figure below. The output swing at 50-ohm load is guaranteed to be 2.9 V.
Troubleshooting
2
10 MHz (Input and Output)
Input—Sine wave
Output—Square wave
Input— > 1.7 volt p-p(+8 to +10 dBm)
Output— > 2.4 volts TTL compatible
50 ohms
50% duty cycle
Input—AC coupled
Output—5 nanoseconds
10 Mhz (input and output)
Input—Sine wave
Output—Sine and Square wave
Input— > 1.7 volt p-p(+8 to +10 dBm)
Output— > 2.4 volts TTL compatible
50 ohms
50% duty cycle
Input—AC coupled
Output—5 nanoseconds
1PPS (Input and Output)
Input—Rectangular pulse
Output—Rectangular pulse
Input— > 2.4 volts TTL compatible
Output— > 2.4 volts TTL compatible
50 ohms
26 microseconds
40 nanoseconds
1PPS (input and output)
Input—Rectangular pulse
Output—Rectangular pulse
Input— > 2.4 volts TTL compatible
Output— > 2.4 volts TTL compatible
50 ohms
26 microseconds
40 nanoseconds
Troubleshooting