Cisco NCS 55A2-MOD-SE-S Manual - Página 22
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Connecting a Cable to the GNSS Antenna Interface
Figure 18: GNSS Port- NCS 55A2
The GNSS RF In coaxial cable shield must be connected to the Facility Equipment Ground through the chassis. The
chassis must have the ground wire connected to the Facility Equipment Ground.
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
Connect Router to the Network
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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
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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