54
Verification Manual
1
Performance Tests
–8.5 dBm and –7.5 dBm
OC-48/STM-16 Rates
1
Press
<Menu>
, choose
System > Stored Settings
then press
<Select>
. Select
Default
then
Recall
.
2
Set the optical attenuator to:
ATTEN 15 dB
WAVELENGTH 1550 nm (or 1310 nm depending on
wavelength used)
CAL=0
ENB ON
Set the optical power meter to
WAVELENGTH 1550 nm (or 1310 nm depending on
wavelength used)
Connect the optical attenuator between the power meter and
the OmniBER OTN’s
Optical Out
port (ensure that all
connections are tight and that the cable has no twists).
3
Set the OmniBER OTN Transmitter to provide OC-48 output
with PRBS bulk payload as follows:
Press
<Menu>
, choose
Tx/Rx > Transmitter Settings >
Physical
then press
<Select>
. Set the
Signal Mode
to
SONET
and
Signal Rate
to
OC48
,
Wavelength 1550 nm
(or if this is
not fitted, select
1310 nm
). Ensure the
Laser
is set to
ON
.
Check the laser LED is illuminated at the selected output
port.
4
Adjust the optical attenuator to obtain a reading of –28 dBm
on the power meter (that is, the receiver minimum sensitivity
for 2.5 Gb/s rate). Take note of the attenuator setting.
5
Set the optical attenuator to Disable mode.
Note:
do not switch OFF the OmniBER OTN laser.
Verification.book Page 54 Monday, January 19, 2004 1:40 PM
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