TCM Standards
The Tandem paths are defined in ITU recommendation G.707 Annex D and Annex E
G.707 Annex D for VC4 and VC3
G.707 Annex E for VC2 and VC1
G.707 defines a tandem connection source and sink and describes the responses of each when defect (alarm) and
error conditions are detected
Tandem connection maintenance signals are carried in:
N1 byte for VC4 and VC3
N2 byte for VC2 and VC
These two bytes are structured similarly, but their functions are not identical
10.1.10 Round Trip Delay
The Round Trip Delay (Propagation Delay) measurement works by sending a test pattern with an error. The time it takes for the
error to reach the receiver is the propagation time through the network.
For Round Trip Delay, set Tx and Rx in coupled mode from
Setup
>
Signal
View the Round Trip Delay of a looped back signal
Set check box on Setup RX pattern to Out-of-Service
Round Trip Delay Results
RXT-3900 e-Manual D07-00-111P Rev A00
Summary of Contents for RXT3900
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