JDS Uniphase CellAdvisor JD780A Series, User Manual

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JD780A Series Analyzers
Using T1 Analyzer
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Introduction
The T1 is what telephone companies have traditionally used to transport digitized telephone
conversations between centra
l offices. As early as the 1960’s, a single T1 circuit made it possible for a
telephone company to deliver 24 high quality voice conversations. T1 is a fully digitalized service with
no possibility of crosstalk, which is common in analog carrier networks where copper pairs pickup
emissions from neighboring pairs. Significant increases in noise immunity were also achieved by
adopting this new digital transmission standard.
Since the early 1980’s, T1 service has been available to private industry throughout the country. This
document will discuss the various types of T1 measurement items, how to measure them, and
understand the general guidelines of T1 analysis using the JD785A Base Station Analyzer.
This portable test instrument can be a useful tool to check the overall health of the transmission
system and assist in locating the source of problems or defects. The T1 Analyzer function provides
following measurements:
 Monitoring
 RX Signal Level
 BERT Testing
 Loop Testing
Display overview
Figure 273 provides descriptions for each segment of the measurement screen.
Figure 273 T1 analyzer screen