Q-Logic 5200 Bedienungsanleitung Seite 138

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5 – Managing Ports
Using the Extended Credits Wizard
5-14 59056-02 A
0
5.2.6
Changing Port Symbolic Name
To change the symbolic name of a port from the faceplate display, do the
following:
1. Open the faceplate display and select a port.
2. Open the Port menu and select Port Symbolic Name.
3. In the Port Symbolic Name dialog, choose one of the following:
Enter a new name for the port in the Set Port Symbolic Name field. The
symbolic name can have up to 32 characters.
Check the Restore Default Port Symbolic Name check box to restore
the default name.
4. Click the OK button.
5.3
Using the Extended Credits Wizard
Each port is supported by a data-buffer with a 16-credit capacity; that is, 16
maximum sized frames. For fiber optic cables, this enables full bandwidth service
over a distance of 26 kilometers at 1-Gbps (0.6 credits per Km) or 13 kilometers at
2-Gbps (1.2 credits per Km). Longer distances can be spanned at full bandwidth
by borrowing credits from designated donor ports thus pooling the buffer
capacities. This is called credit extension. Each donor port contributes 15 credits
to the pool from which the recipient ports can draw. The recipient port also loses
one credit in the process. For example, one donor port contributes 15 credits to
the pool from which a recipient draws for a total of 30 credits (15+15). This
provides approximately 50 Km at 1-Gbps (30÷0.6) or 25 Km at 2-Gbps (30÷1.2).
Only 1-Gbps/2-Gbps ports can donate or borrow credits. To extend credits, open
the Wizards menu and select Ext Credit Wizard. The Extended Credit Wizard
leads you through the following process to extend credits based on transmission
distance requirements:
1. Extended Distance: Explains the concepts and principles of extending port
credits. Click the Next button.
2. Extended Distance Requirements: Specify speed and distance requirements
for each port then click Next.
3. Designate Donor Ports: Select available ports and click >> to move the port
into the Selected Donor Port column shown in Figure 5-3. Match the number
of ports needed with the number of designated donor ports. Click the Next
button.
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