Tektronix 071-0855-05 user manual Packet Over Sonet POS, SPE/VC3 Stuff Column Control

Operating Basics: User Interface

Signal Structure

Signal structure allows the user to choose the mapping structure of the transmitted 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	4 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

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)

POS (Only valid when Signal Structure is STS-192c/VC-4-64C)

When Fixed Data is selected a button marked Edit Fixed Data is displayed. To change the Fixed Data to a different value, click the Edit Fixed Data button and type the new value into the text box beside the button. In the Test Pattern selection box, observe that the value after Fixed Data changes to match the newly entered value.

Packet Over SONET (POS)

In order to use the POS testing capabilities, POS must be selected as the Active Channel Test Pattern. Select POS from the drop down menu under Active Channel Test Pattern in the Receiver Setup menu. The following setup conditions must exist before POS can be selected:

•Signal Source is set to Internal.

•Timing Source is set to Internal.

•Signal Structure is set to STS-192c.

NOTE: To transmit a POS test pattern, the Signal Structure must be set to STS-192c and the signal source cannot be through mode.

SPE/VC3 Stuff Column Control

The stuff column control allows column 30 and column 59 of the SPE (VC3) to be stuffed with either all zeros or with the payload pattern. This option is only available if the Signal Structure

is STS-1 or VC3. Set channel from 1 to 192 or set all.

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