Endace DAG 3.7D, User Manual

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EDM01-06: DAG 3.7D Card User Guide
©2006 8 Version 1: March 2006
Chapter 3:
Confidence Testing
Introduction Confidence testing is a process to determine the DAG 3.7D card is
functioning correctly.
The process also involves a card capture session, and demonstrates
configuration in the style of 'What You Can See You Can Change',
WYCSYCC.
Interface statistics are also inspected during this process.
Card
Sensitivity
Overview
The input signal level to the DAG 3.7D card should be within the dynamic
range of the receiver. If the input signal power is slightly out of range then
an increased bit error rate will be experienced.
If the power is well out of range then the system will be unable to lock to the
PDH frames.
Signal Source Specifications
The signal source should meet DS3 template of ANSI-T102.1993 Figure 4
and STS-1 template of ANSIT102.1993 Figure 5, Loss characteristics of the
WE728A or RG 59B cable should be better than Figure C2 of ANSI-
T102.1993.
Receiver Capability
The receiver can handle up to 450 feet of cable loss (5.5dB) from the DSX
cross-connect.
Input Signal Level
The input signal level is measured in mVp, the Peak Differential Input
Amplitude in millivolts.
There is an optional RX-monitor mode that adds 20dB gain. This is intended
for use with DS3 Monitor signal ports. The DS3 Monitor port is a resistively
attenuated (around -21.5dB) copy of the DSX3 cross connect signal. The
minimum signal level at a DSX3 cross-connect is 360mVp, so the DSX3
Monitor level at minimum is 30mVp, requiring the RX-monitor mode.
Optimum Setup
The optimum way to set up a DAG card is to measure the signal level at the
receiver, and to make sure that it is well within the specified range.