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Name Server Data window
The Name Server Data window displays information about the port and the connected device. To open the
Name Server Data window, select one or more switch modules in the Topology window and click the Name
Server tab below the data window. You can also open the Name Server Data window in the Faceplate window.
See Table 19 on page 100 for a description of the Name Server Data window entries.
Configuring ports
✏ NOTE
For external ports (0, 15), all port parameters apply. For internal ports, only the port state setting is
configurable.
The external Fibre Channel ports are self-configuring GL_Ports that auto-negotiate transmission speeds of 1
Gbps or 2 Gbps depending on the connected device. A GL_Port connects to a loop of public devices or a
single device and configures itself as a fabric loop port (FL_Port), fabric port (F_Port), or an expansion port
(E_Port). Each external port has 12 buffer credits. This enables a cable length up to 20 km at 1 Gbps or 10 km
at 2 Gbps. Eleven credits from one port can be borrowed by the other port to extend transmission distances.
The buffer credit flow control mechanism provides a way to ensure full use of the media, regardless of length,
by providing for frame streaming. With frame streaming, the sender can transmit as many frames as there are
credits without having to wait for a response to one frame before transmitting the next frame. The media can
then be continuously in use at its rated capacity.
The external port (0,15) settings or characteristics are configured using the Port Properties window shown in
Figure 18 To open the Port Properties window, select one or more external ports and click Port / Port
Properties.
Figure 18. External Port Properties window
The Port Properties window displays the switch module name and the selected external ports. Use the Port
Properties window to change the following parameters:
• Port state
• Port speed
• Port mode
• TL mode
• Port buffer credits
• I/O stream guard (RSCN suppression)