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 HP 37718A 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.
NOTE | You can only measure Round Trip Delay on a 64 kb/s test signal obtained | |
| from a 34 Mb/s or 2 Mb/s DSn interface or DSn payload signal. | |
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HOW TO: | 1 | If measuring on an SONET interface, set up the SONET transmit and |
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| receive interfaces and payloads required. See "Setting SONET |
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| Transmit Interface " page 4 and “Setting SONET Receive Interface” |
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| page 17. |
| 2 | If measuring on a DSn interface, set up the DSn transmit and receive |
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| interfaces and payloads required. See “Setting DSn Transmit |
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| Interface” page 2 and “Setting DSn Receive Interface” page 15. |
| 3 | Connect a loopback to the network equipment. |
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