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Making Measurements
Measuring Round Trip Delay
Measuring Round Trip Delay
Description:
The time taken for voice traffic to pass through the network is very important.
Excessive delay can make speech difficult to understand.
The Round Trip Delay feature of the OmniBER 718 measures the delay in a 64 kb/s
timeslot.
A test pattern is transmitted in the 64 kb/s timeslot and a timer is set running. A
loopback is applied to the network equipment to return the test signal. The received
pattern stops the timer and the Round Trip Delay is calculated.
N O T E
You can only measure Round Trip Delay on a 64 kb/s test signal obtained from a
140 Mb/s, 34 Mb/s, 8 Mb/s or 2 Mb/s PDH/DSn interface or PDH/DSn payload
signal.
1 If measuring on an SDH interface, set up the SDH transmit and receive interfaces
HOW TO:
and payloads required. See "Setting SDH Transmit Interface " page 29 and
"Setting SDH Receive Interface" page 49.
2 If measuring on a PDH interface, set up the PDH transmit and receive interfaces
and payloads required. See "Setting PDH/DSn Transmit Interface (option 012)"
page 26 and "Setting PDH/DSn Receive Interface (Option 012)" page 47.
3 Connect a loopback to the network equipment.
4 Choose ACTION
118
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to start the measurement.
ON
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