Operating Basics: User Interface
OTS9100 User Manual 2-27
BERT Mode
For some modules a third option is available from the Signal Standard menu, the BERT mode.
With this mode, the OTS9100 becomes a BERT generator. The Test Pattern selection for the
active channel is the only valid selection on the transmitter signal setup page when BERT mode
is selected. When the signal standard is returned to either SONET or SDH mode, the settings
will return to the last settings used.
Most LED indicators are invalidated by the BERT mode. The only valid active LEDs are Signal
Present, TSE, and LSS.
Signal Source
Signal Source selects the data source used as the output signal. The modes available are Internal
mode and Through mode.
Internal Mode: Internal mode provides an internally-generated 9.95238 Gb/s
signal with the data in a PN7 scrambled NRZ format.
Through Mode: If using through mode, the user has the choice of passing a
9.95238 GHz signal through the module in two ways, non-intrusive and intrusive.
Non-intrusive will output an unmodified external signal. Intrusive allows the user to
modify some aspects of the external signal as it passes through the module. To set
the Overhead bytes available for overwriting, refer to the Transport Overhead or
Path Overhead screens.
NOTE: As described in Getting Started, if the modules are not installed into the proper slots,
Through Mode is not available as a signal source option.
Timing Source
The timing source pull-down menu selects either internal or external timing. Internal timing uses
the internal clock. External timing uses the External 155 Clock In connection on the Clock Trig
module.
Trigger Output
The Trigger Output allows the user to select what condition activates the output trigger. Check
the appropriate box for Anomaly Trigger or Defect trigger, or activate both. The triggering on
defects provides an active HIGH for each frame in which a defect is inserted. The triggering on
anomalies provides an active HIGH for each frame in which an anomaly is inserted.
Active Channel(s)
The Active Channel(s) section controls the settings for signal structure and test pattern of the
selected active channel(s). To set the active channel, use the up/down cursors or click the Set
Channel button. When the Set Channel button is clicked, the bar for Active channel changes into
an interactive menu. Type in the text box to select the channel or click Set Channel 1 to choose
channel 1. If the Set All button is clicked, the Background Channels section is grayed out. Set
channel from 1 to 192 or set all.