EXFO FTB-800 Series for FTB-1 - Manual (Page 151)

Test Setup - Test Configurator, Timer, and System
NetBlazer 141
Interface - Port (Fibre Channel)
Login
After a link is established, it is possible to login to the Fibre Channel
Network to send and receive data between a local and remote fibre
channel port.

Enable check box when selected (default) allows to press the Login
button to start the login process.

Advertised BB_Credit is the number of frame buffers the local port has
available to receive frames from the remote port: 1 to 65535 (default is
10). Advertised BB_Credit is advertised to the remote port through the
Login process. Changing the Advertised BB_Credit requires to
manually re-send a login using the Login button.

Login button allows the initiation of the Login process with the
selected Advertised BB_Credit. Available when the Login - Enable
check box is selected. The capability to login is available only with
Framed Layer 2 (FC-2) when a successful link has been established.
There are two Login processes supported by Fibre Channel: Port
Login (PLOGI) and Fabric Login (FLOGI).
It is possible to skip the Login procedure and use the BB_Credit value.
This is called Implicit Login and ia only applicable for Point-to-Point
topology. For Point-to-Point topology, you must manually configure the
Available BB_Credit value for the remote port.

Discovered Topology indicates the discovered topology.
Fabric: Ports are interconnected to a fabric switching network. A
Fabric and Port login are required, and the BB_Credit value is set
based on the buffer capacity of the fabric switch.
Point To Point: Direct link between two ports.