Cisco Systems ASR 901 10G Manuale Utente
B-7
Cisco ASR 901 10G Series Aggregation Services Router Hardware Installation Guide
OL-28105-02
Appendix B Cable Specifications
GPS Port Pinouts
GPS Port Pinouts
The Cisco ASR 901 10G router has a 10Mhz and a 1PPS GPS port that allow you to configure input or
output clocking with a GPS device.
output clocking with a GPS device.
summarizes the pinouts for the 10Mhz and 1PPS
interfaces.
Note
For pinouts related to ToD and 1PPS using the BITS interface, see
.
The 1PPS interface type is Series 1.0 / 2.3, 50 ohms.
For instructions on how to configure the 10 Mhz and 1PPSs ports, see the Cisco ASR 901 Series
Aggregation Services Router Software Configuration Guide.
Aggregation Services Router Software Configuration Guide.
3
Not connected
4
Ground
5
Ground
6
Not connected
7
TOD_N
Output/Input
Time of Day RS422 differential input
or output
or output
8
TOD_P
Output/Input
Time of Day RS422 differential input
or output
or output
Table B-7
Time of Day RJ-45 Interface Pinout
Pin
Signal Name
Direction
Description
Table B-8
GPS Port Pinouts for the Cisco ASR 901 10G router
10 Mhz
1PPS
Waveform
Input—Sine wave
Output—Square wave
Input—Pulse shape
Output—Pulse shape
Amplitude
Input— > 1.7 volt p-p
(+8 to +10 dBm)
(+8 to +10 dBm)
Output— > 2.4 volts TTL
compatible
compatible
Input— > 2.4 volts TTL
compatible
compatible
Output— > 2.4 volts TTL
compatible
compatible
Impedance
50 ohms
50 ohms
Pulse Width
50% duty cycle
26 microseconds
Rise Time
Input—AC coupled
Output—5 nanoseconds
40 nanoseconds