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Enterprise Fabric Suite 2007 User Guide • September 2008
on the operational state of the port. The AL Fairness option controls how frequently
the switch can arbitrate for access. Applies only to ports running in loop (FL) mode.
To open the Advanced Port Properties dialog, select one or more ports, open the
Port menu, and select Advanced Port Properties.
the switch can arbitrate for access. Applies only to ports running in loop (FL) mode.
To open the Advanced Port Properties dialog, select one or more ports, open the
Port menu, and select Advanced Port Properties.
FIGURE 6-7
Advanced Port Properties Dialog
Using the Extended Credits Wizard
The Extended Credit Wizard is a series of dialogs that leads you through the process
of extending credits based on transmission distance requirements. Warning dialogs
are provided to help you avoid un-intentional changes. Each port is supported by a
data buffer with a 16-credit capacity; that is, 16 maximum sized frames.
of extending credits based on transmission distance requirements. Warning dialogs
are provided to help you avoid un-intentional changes. Each port is supported by a
data buffer with a 16-credit capacity; that is, 16 maximum sized frames.
For fibre optic cables, this enables full bandwidth over the following approximate
distances:
distances:
■
26 kilometers at 1-Gbit/sec (0.6 credits/Km)
■
13 kilometers at 2-Gbit/sec (1.2 credits/Km)
■
6 kilometers at 4-Gbit/sec (2.4 credits/km)
■
3 kilometers at 8-Gbit/sec (4.8 credits/km)
Beyond these distances, there is some loss of efficiency because the transmitting port
must wait for an acknowledgement before sending the next frame.
must wait for an acknowledgement before sending the next frame.