Техническая Спецификация для Cisco Cisco BWX 2305 Basestation Antenna
Data Sheet
© 2009 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information.
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Cisco BWX 8303 Basestation Timing System
Standards-compliant Mobile WiMAX systems require extremely accurate frequency and
timing to ensure an optimal user experience. The Cisco
®
BWX 8303 Basestation Timing
System receives a timing signal from a GPS antenna and provides a 1-pulse-per-second
(PPS) signal along with an extremely accurate 10-MHz reference signal that is locked to
the GPS timing signal. With the base stations all synchronized to the same GPS
reference signal, interference in the network is reduced, allowing the user to experience
the full potential of the network.
Features and Benefits
The Cisco BWX 8303 Basestation Timing System offers service providers the following benefits:
●
Control and monitoring with console (DB-9) connector over RS-232, Telnet, or RJ-45
connector for Ethernet over Simple Network Management Protocol (SNMP)
●
Minimum 1 hour holdover time in the event of satellite communication disruption
●
Compact 1-rack-unit (1RU) design
●
Maintenance-free design
Figure 1. Cisco BWX 8303 Basestation Timing System
Product Architecture
The Global Positioning System (GPS) consists of 24 satellites orbiting the earth. Originally
deployed for military applications, the satellites send signals that are used commercially for
extremely accurate timing and positioning functions. Each satellite transmits signals with unique
identifying codes that are traceable to the United States Naval Observatory Master Clock System.
GPS receivers on earth can receive these signals and calculate the position of the receiver to
extreme accuracy. In addition, a local oscillator can be locked to these timing signals to generate a
phase-locked 10-MHz reference signal.
The Cisco BWX 8303 provides DC power to and receives input from the GPS antenna. The
internal receiver is capable of tracking up to eight satellites simultaneously; however, only four
satellites are required to initially obtain frequency lock, after which the Cisco BWX 8303 can
maintain the lock with just a single satellite being tracked.