Round Trip Delay - HP 37717C Operating Manual

Communications performance analyzer, pdh / dsn

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PDH / DSn Testing With The HP 37717C

Round Trip Delay

Application

In certain applications the time taken for a signal to pass through the network can be

very important for example Voice Trafﬁc where excessive delay can make speech

difﬁcult to understand. The Round Trip delay feature of the HP 37717C allows

measurement of the delay at any interface or test signal rate.

Default (Known State) Settings

It can be advisable to set the HP 37717C to a known state prior to setting up to make

a measurement. This clears all previous settings and provides a clearly deﬁned

instrument state. For a list of Default Settings and the procedure for accessing them

see Stored Settings in the Mainframe Operating Manual.

Test Setup Procedure (Round Trip Delay)

The following Option must be ﬁtted to the HP 37717C to perform this test:

• UKJ (USA) - Structured PDH Module

This setup is interfaced at 140 Mb/s with a test signal of 64 kb/s. A test pattern is

transmitted in the 64 kb/s slot 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.

Round Trip Delay

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