Description
Direction
Signal
Name
Pin
Not used
—
—
7
Not used
—
—
8
GPS Port Pinouts
The following table summarizes the GPS port pinouts.
The 10 Mhz and 1 PPS interfaces can be configured as input or output using Cisco IOS CLI commands. For
more information, see the
Cisco ASR 920 Series Aggregation Services Router Configuration Guide
.
Note
Table 12: GPS Port Pinout
1PPS (input and output)
10 Mhz (input and output)
Input—Pulse shape
Output—Pulse shape
Input—Sine wave
Output—Sine or 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
The following table summarizes the ToD/1-PPS port pinouts.
Table 13: RJ-45 1PPS/ToD Port Pinouts
Description
Direction
Signal
Name
Pin
Do Not Connect
Output
RESERVED
1
Do Not Connect
Input
RESERVED
2
1PPS RS422 signal
Output or
Input
1PPS_N
3
Cisco ASR-920-12SZ-A and Cisco ASR-920-12SZ-D Aggregation Services Router Hardware Installation Guide
66
Troubleshooting Aids
GPS Port Pinouts
