EXFO MAX-800 Series, User Manual

Page: 183 / 495

Test Setup - Test Configurator, Timer, and System
MaxTester
175
Signal - Signal Configuration (OTN)
Signal - Signal Configuration (OTN)
Note:
The following signal configuration parameters are available from the
interface block.
From the
Test
menu, tap
Setup
,
Test Configurator
, the interface block,
and on the Signal tab.

OTU4
,
OTU2
, or
OTU1
Note: At least one of the two check boxes, FEC or Scrambler , must be selected in
order to prevent potential alarms caused by a lack of bit transition on the
optical signal. For example to disable
FEC , first select the Scrambler check
box then clear the FEC check box.

FEC check box when selected (default) enables the FEC in TX/RX
and allows detecting, reporting, and correcting up to 8 symbol
errors (Correctable) per codeword. If there are over 8 symbol
errors detected, they are reported as uncorrectable errors.

FEC-CORR Alarming check box when cleared (selected by
default) does not report the
FEC-CORR
error status
(current/history), seconds, and does not affect the global test
verdict. Only available when
FEC
is enabled.

Scrambler check box when selected (default) provides enough
“0” and “1” transitions on the optical signal for clock recovery.
Note: When the Scrambler check box is cleared, the receiver circuitry is forced to
operate in a condition which is outside of the specified OTN operating
conditions, potentially causing alarms/errors. This configuration can be
used for special analysis in a lab environment.