Aethra d2001 nx Manuale Utente
USER’S MANUAL
ISDN TESTER AND ANALYZER D2001
NX
The protocol is in Master mode by default when the instrument is
configured as NT1-S.
configured as NT1-S.
3.4.4. Measuring the round trip delay of a B channel
The delay can be measured in ISDN configuration, after connecting a B channel. The
delay is the time needed to transport a byte from the local to the remote terminal and
back. Its value depends on the call routing.
delay is the time needed to transport a byte from the local to the remote terminal and
back. Its value depends on the call routing.
The ISDN is oriented to transport one byte at a time (byte-timing).
For a correct measurement, the remote terminal must make a data loop on the
channel.
channel.
This measurement can be useful in case of users with video
terminals that are sensitive to the delay between B channels. A
channel can have a different delay values for different calls,
according to the call route in the switching exchanges.
terminals that are sensitive to the delay between B channels. A
channel can have a different delay values for different calls,
according to the call route in the switching exchanges.
To measure delay:
1
Make a connection to a terminal with data loop.
2
Scrolls to page three
3
Makes the measurement
The instrument can measure delay up to ten seconds. In case of higher values, or if
the remote terminal does not make the data loop, the instrument will inform the user
with the "NO REMOTE LOOP".
the remote terminal does not make the data loop, the instrument will inform the user
with the "NO REMOTE LOOP".
Once the delay has been measured, the delay value is saved until the call is
disconnected. Subsequently the active call can be looped with the LOOP softkey.
See § 3.4.2. The delay for this call is displayed on the B channel status page. See
chapter 6.
disconnected. Subsequently the active call can be looped with the LOOP softkey.
See § 3.4.2. The delay for this call is displayed on the B channel status page. See
chapter 6.
CHAPTER 3 - PERFORMING A MANUAL TEST
45