Q-Logic 5200, 5202 manual Changing Port Symbolic Name, Using the Extended Credits Wizard

5 – Managing Ports	0
Using the Extended Credits Wizard

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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