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The ADSL ATM BERT can be configured as follows:
• A single
loopback.
(transported in ATM cells) and the pattern is looped
back to the receiver. The BERT operates only on the
lower of the two ADSL line speeds (up to 800 Kbps
upstream speed). The ATM PHY or cell level loopback
must be invoked in the DSLAM (ATU-C) or in the
modem (ATU-R).
• Two
ADSL line. This test runs a full bandwidth BERT at
upstream and downstream line speeds. You must set up
the testers to send and receive the same BERT pattern
at known line speeds over known VCCs (Virtual
Channel/Circuit Connections).
• A single
behind the DSLAM.
used to generate ATM cells containing the BERT
pattern.
Note
The BERT pattern available on
by the software version installed.
Displaying ADSL physical layer BERT Results
See
DSL Layer
Setting up an ATM BERT
Note
To be able to run an ATM BERT, you must set up the ADSL
layer to be connected.
-1- From the Select Test Mode screen, press F4 Setup
-2- Select BERT to display the BERT Setup screen.
Issue 7 - 05/02
AuroraPresto
AuroraPresto
AuroraPresto
AuroraPresto
on page 4-33.
to display the Main Setup screen.
Section 5 - ATM Layer Tests
with remote ATM PHY level
generates the BERT Pattern
testers terminating the ends of the
AuroraJazz
with
AuroraPresto
and
AuroraJazz
connected
AuroraJazz
are
may be limited
4-59
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