Tektronix 071-0855-05 user manual Edit Path Overhead, Path Through Mode

Operating Basics: User Interface

Edit Path Overhead

To edit the path overhead, click the Edit button. This brings up a Path Overhead dialog box, shown in Figure 2-17. The dialog box displays the overhead bytes in white text boxes. To edit, highlight the appropriate box and type in the desired entry. To set the overhead back to its default state, click the Restore Defaults button. When editing is complete, click OK to return to the main screen.

Path Through Mode

When using through mode, a number of the Path overhead bytes may be overwritten as the external signal passes through the module. This is done through the use of the Through Mode selections available in the Path Overhead menu, as shown in Figure 2-

18.If the box is checked for Regenerate B3 Parity, the receiver will recalculate the B3 parity and insert the new information into the overhead as the signal is passed through the module. To disable B3 parity regeneration, ensure that the Regenerate B3 Parity box is not selected.

To overwrite an incoming byte, click in the box beside the selection under the Overwrite Incoming heading. If you wish to keep a byte from being overwritten, make sure the box beside the selection is not checked. The bytes available to be overwritten are J1 Trace, C2, G1, F2, H4, Z3, Z4, and Z5. B3 parity regeneration is always enabled if any of the byte or payload overwrite selections are checked.

If Overwrite Payload is checked, the payload data is replaced with the Test Pattern selected on the Signal page.

NOTE: There is no explicit byte edit for G1. Checking the G1 overwrite setting provides the ability to insert REI-P.

Figure 2-17: Path Overhead dialog box

NOTE: The Tx Signal Structure in the Tx Setup menu must match the Signal Structure of the mating Rx in order for intrinsic Path Through mode to operate correctly. If the Signal Structure of the Tx does not match the Signal Structure of the Rx, the overwritten bytes will not be accurate. This is also true for B3 regeneration.

OTS9100 User Manual 2-35