GNSS Module
The GNSS module (PID=A920-CM-GNSS) provides the time-of-day (ToD), 1PPS, and 10MHz network
synchronization signals. The GNSS module is not hot swappable.
Network Timing Interfaces
• 1PPS—1PPS input for GPS Synchronization. This connector on the front panel can provide 1PPS output
as well from Cisco ASR-920-12SZ router. The input or output direction can be configured using software.
• 10MHZ—10MHz input for GPS Synchronization. This connector, present on the front panel, can also
provide 1PPS output from the Cisco ASR-920-12SZ router. The input or output direction can be configured
using IOS-XE software.
• BITS—The BITS interfaces support clock recovery from either a T1 at 1.544 MHz or an E1 at 2.048
MHz, configurable by software. BITS interface is provided through a standard RJ-48 connector on the
front panel.
• ToD—The time-of-day interface can output the ToD in a format configurable by software. However,
this interface can be configured as an input interface also. In this case, the router can read the ToD
information from the external GPS unit.
ToD interface is provided through a standard RJ-48 connector on the front panel.
Management Interfaces
Alarm
The router supports four dry contact alarm inputs through an RJ-45 jack on the front panel.
• Normally Open—indicates that no current flows through the alarm circuit and the alarm is generated
when the current is flowing.
Each alarm input can be provisioned as critical, major, or minor.
Console
The RS232 console port provides transmission (Tx), reception (Rx), and ground (Gnd).
Auxiliary Console
The Auxiliary Console port provides transmission (Tx), reception (Rx), and ground (Gnd).
Cisco ASR-920-12SZ-A and Cisco ASR-920-12SZ-D Aggregation Services Router Hardware Installation Guide
11
Overview
GNSS Module
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