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(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)
Internal port (1 through 14) configuration is limited to the port state as shown in Figure 19 on page
113 To open the Port Properties window, select one or more internal ports and click Port> Port
Properties.
112
SBCEFCSW/SBFCM: HMM and Troubleshooting Guide
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