Introduction - Symmetricom TimeSource 2700 Manual

Cdma primary reference source

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Introduction

TimeSource 2700

The TimeSource 2700 is a Primary Reference Source (PRS) that

tracks and ensembles multiple CDMA pilot signals. The CDMA

pilot signals originate from CDMA base stations equipped with

GPS based timing sources traceable to UTC. A pilot channel is

transmitted continuously by each CDMA base station. Pilot

channels allow the handset to acquire timing, provide phase data

for demodulation, and provide a signal strength comparison

between base stations.

The TimeSource 2700 provides Stratum 1 outputs by using

advanced BesTime technology. By using inputs from one to eight

CDMA pilots and a rubidium local oscillator, the TimeSource 2700

meets Telecondia GR2830 network performance requirements. If

the CDMA signals are disrupted, the BesTime algorithm continues

to predict CDMA timing information, which enhances system

holdover performance.

Since CDMA is one of the most widely-used digital wireless

services in the United States, the TimeSource 2700 can be

installed in most metropolitan areas. Because the antenna is

located inside the building within a few feet of the shelf, the

antenna installation problems sometimes encountered with GPS

based systems are eliminated.

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