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Operating Basics: User Interface
2-48 OTS9100 User Manual
BERT Mode
For some modules there is a third option 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 current selections in the setup menus.
Most LED indicators are also invalidated by the BERT mode. The only valid LEDs are Signal
Present, TSE, and LSS.
Signal Structure
Signal structure allows the user to choose the mapping structure of the received signal. The
mapping structures provided are listed in the table below. As shown, the structures all provide
concatenated structures.
SONET SDH
1 x STS-192c 1 x VC4-64c
4 x STS-48c 2 x VC4-16c
16 x STS-12c 16 x VC4-4c
64 x STS-3c 64 x VC4
192 x STS-1 192 x VC3
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.
Test Pattern
Test Pattern allows the user the select a pattern to fill the chosen active channel of the internally
generated 9.95238 Gb/s signal. The patterns available are:
PN15 (PRBS 2^15-1), Inverted PN15 (ITU O.151)
PN23 (PRBS 2^23-1), Inverted PN23 (ITU O.151)
PN31 (PRBS 2^31-1), Inverted PN31 (ITU O.150)
All Zeros
All Ones
Fixed Data (8-bit)
In order to use the POS testing capabilities, POS must be selected as the Active Channel Test
Pattern. In addition, POS must be selected as the Active Channel Test Pattern in the Receiver
Setup menu.
NOTE: To receive a POS test pattern, the Signal Structure must be set to
STS-192c.