EXFO FTB-8500 Series for FTB-500 - Manual (Page 389)

System Tabs
Ethernet and Fibre Channel Application 375
FC Test Preferences
Configuration
Laser On: Allows to select Laser On every time a test is created manually
using the wizard. This setting is selected by default.
Interface Configuration
Note: The following interface configuration parameters are available for both
ports (FTB-8510B).

PSP (Link Protocol): Enabling the Primitive Sequence Protocol (PSP)
allows link management. Disabling the PSP forces the port in Active
mode.

Login: Login is only available with Framed Layer 2 and allows
changing the Advertised BB_Credit value.

Advertised BB_Credit: Advertised BB_Credit is the number of frame
buffers that a local port has available to receive frames from another
port, and is advertised to the remote port through the login process.
Enter the Advertised BB_Credit value. Choices are from 1 to 65535.
The default setting is 10.

WWN Source: The Worldwide name is only available when Login is
selected with Fabric network topology. Enter the Worldwide name
source address.