Round trip delay (rtd) – EXFO FTB-8100 Series Transport Blazer for FTB-200 User Manual
Page 357
Advanced Tabs
SONET/SDH Application
345
Round Trip Delay (RTD)
Round Trip Delay (RTD)
Press Main, Test, Advanced, and Round Trip Delay.
Round Trip Delay (RTD) measurements are needed to quantify the time it
takes for the signals to reach their destination. Usually, transport delay is
due to two factors: long configured paths and transit times through the
network elements along the path. Therefore, RTD measurements are
significant in systems that require two-way interactive communication,
such as voice telephony, or data systems where the round-trip time directly
affects the throughput rate.
Note: To do Round Trip Delay test, the remote NE should be configured to provide
a loopback. However a local DSn test can be configured to use loopback
codes allowing RTD testing.
Note: Be aware that RTD requires error free operation conditions to provides
reliable results. Therefore, RTD results could be affected by error injection
or error introduced by the network.
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