Cisco ASR 903 Hardware Installation Guide

InterfaceLabel
10 MHz input timing port7
10 MHz output timing port8
Time of Day (ToD) timing port9
BITS timing port10
Ethernet management port11
For more information about installing the RSP, see Installing an RSP Module. For more information about
the RSP LEDs, see RSP LEDs.
GNSS Module (A900-CM-GNSS)
The GNSS module is present on the RSP3 modules. It is a pluggable module that allows direct interface with
the external antenna.
Using a single GPS antenna input for both RSPs requires usage of external splitters.Note
To reduce the risk of fire, use only No. 26 AWG or larger telecommunication line cord. Statement 1023Warning
The GNSS module is not hot swappable.Note
GNSS Module RF Input Requirements
•
The GNSS module requires an active GPS/GNSS antenna with built-in Low-Noise Amplifier (LNA)
for optimal performance. The antenna LNA amplifies the received satellite signals for two purposes:
◦
Compensation of losses on the cable
◦
Lifting the signal amplitude in the suitable range for the receiver frontend
The Amplification required is 22dB gain + cable/connector loss + Splitter signal loss.
The recommended range of LNA gain (LNA gain minus all cable and connector losses) at the connector of
the receiver module is 22dB to 30dB with a minimum of 20dB and a maximum of 35dB.
•
GNSS module provides 5V to the active antenna through the same RF input.
•
Surge requirement:
Cisco ASR 903 Aggregation Services Router Hardware Installation Guide
26
Cisco ASR 903 Router Overview
GNSS Module (A900-CM-GNSS)

Cisco ASR 903 Specifications

General

Brand	Cisco
Model	ASR 903
Category	Network Router
Language	English