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SONET_Usr.bk Page 61 Wednesday, December 13, 2000 11:11 AM
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HOW TO:
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Setting the Interfaces - SONET Operation
Setting Transmit Interface
If you wish to set the OmniBER 720 transmitter and receiver to the same interface
settings choose
OTHER
SETTINGS CONTROL COUPLED
Laser On/Off Control
If you wish to switch off the laser when connecting/disconnecting cables, set the
field between the wavelength and INTERNAL selections to OFF. When the laser is
on the laser symbol at the bottom right of the display is illuminated (yellow).
.
1 Make your choice of SIGNAL rate.
Choose
unless
INTERNAL
chosen, see "Setting THRU Mode " page 64.
2 Make your choice of CLOCK source. The clock can be internally sourced from
the instrument, recovered from the signal at the optical RECEIVE port or
externally sourced from the CLOCK REF IN ports (MTS 64 kb/s, BITS 1.5 Mb/
s or 10 MHz REF).
3 If required choose the FREQUENCY OFFSET value. See "Adding Frequency
Offset" page 84.
4
Choose the required
F/G MAPPING
and the BACKGROUND selection. The FOREGROUND
B/G MAPPING
selection is the channel that is chosen for test purposes. The BACKGROUND
is required. If
THRU MODE
and PAYLOAD TYPE, then select
is
THRU MODE
61
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