Network Timing Interfaces
• 10Mhz input or output—Miniature coaxial connectors for 10Mhz timing (input or output). You can use
this interfaces with an external GPS device to send or receive clocking from the router
• 1PPS input or output and ToD input or output—This interface is used for input or output of time-of-day
(ToD) and 1PPS pulses. ToD format includes both NTP and IEEE 1588-2008 time formats.
The same RS422 pins for 1PPS and TOD are shared between input and output directions. The direction for
each can be independently configured through software.
• GNSS RF IN—This interface is used to connect the external GPS antenna to the in-built GPS module.
External Alarm Inputs
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.
Management Interfaces
The following management interfaces are supported:
Management ENET Port
A single management copper ENET port supporting 100/1000Base-T operation is provided on the front panel.
It uses a standard RJ-45 jack.
RS232 Console Port
The RS232 console port provides transmission (Tx), reception (Rx), and ground (Gnd).
The RS232 console port is enabled only through the Cisco-designed cable adapter USB type A cable to
RJ-45 adapter cable. To use this port, disable the flow control on the terminal.
Note
Do not plug the USB-to-RJ45 adapter cable in the USB Memory port.Caution
Cisco ASR-920-12SZ-IM Aggregation Services Router Hardware Installation Guide
9
Cisco ASR 920 Series Aggregation Services Router Overview
Network Timing Interfaces
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