Overview of GNSS
Effective Cisco IOS XR Release 7.1.1, the following Cisco NCS 540 variants support GNSS receiver:
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N540X-16Z4G8Q2C-A
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N540X-16Z4G8Q2C-D
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N540X-12Z16G-SYS-A
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N540X-12Z16G-SYS-D
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N540-24Z8Q2C-SYS
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N540-28Z4C-SYS
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N540-ACC-SYS
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N540X-ACC-SYS
Effective Cisco IOS XR Release 7.3.1, the following Cisco NCS 540 variants support GNSS receiver:
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N540-24Z8Q2C-SYS
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N540-28Z4C-SYS
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N540-ACC-SYS
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N540X-ACC-SYS
Effective Cisco IOS XR Release 7.4.1, the following Cisco NCS 540 variant supports GNSS receiver:
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N540-24Q8L2DD-SYS
No license is required to enable the GNSS module. The GNSS LED on the front panel indicates the status of the module. The following table describes the different status of GNSS LED:
LED Status | Description |
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Green | GNSS NormalState.Selfsurvey is complete. |
Amber | GNSS not shut and not locked |
OFF |
If GNSS is not configured or is shut. |
When connected to an external antenna, the module can acquire satellite signals and track up to 32 GNSS satellites, and compute location, speed, heading, and time. GNSS provides an accurate one pulse-per-second (PPS), a stable 10 MHz frequency output to synchronize broadband wireless, aggregation and pre-aggregation routers, and an accurate time-of-day (ToD).
Note |
NCS540X can also receive 1PPS, 10 MHz, and ToD signals from an external clocking and timing source. However, the timing signals from the GNSS module (when enabled) take precedence over those of the external source. |
Note |
We do not recommend that you configure both the front panel (10M, 1PPS and ToD) input configuration and the GNSS input configuration. |
By default, anti-jamming is enabled on the GNSS module.