2–Planning Performance

Regardless of how many credits are borrowed, extending credits requires a minimum cable length that is dependent on transmission speed. Extending credits over short cables can result in excessive port resets. Table 2-2describes the distances that are possible for a port with 30 credits and the minimum cable lengths.

Table 2-2. Extended Credit Distances and Cable Lengths

Transmission Speed

Range for 30 Credits

Minimum Cable Length

 

 

 

1-Gbps

50 Km (30÷0.6)

3 Km

 

 

 

2-Gbps

25 Km (30÷1.2)

1.5 Km

 

 

 

4-Gbps

12 Km (30÷2.4)

750 m

 

 

 

8-Gbps

6 Km (30÷4.8)

370 m

 

 

 

10-Gbps

4 Km (30÷7.2)

250 m

 

 

 

Bandwidth

Bandwidth is a measure of the volume of data that can be transmitted at a given transmission rate. An SFP port can transmit or receive at nominal rates of 1-, 2-, 4-, or 8-Gbps depending on the device to which it is connected. This corresponds to full duplex bandwidth values of 212 MB, 424 MB, 850 MB, and 1700 MB respectively. X2 ports transmit at a nominal rate of 10-Gbps, which corresponds to a full-duplex bandwidth value of 2550 MB.

For optimal performance, devices connected to the same I/O blade should have the same transmission speed. Connecting devices of different transmission speeds on the same I/O blade can reduce the maximum bandwidth by as much as 10%.

Multiple source ports can transmit to the same destination port if the destination bandwidth is greater than or equal to the combined source bandwidth. For example, two 2-Gbps source ports can transmit to one 4-Gbps destination port. Similarly, one source port can feed multiple destination ports if the combined destination bandwidth is greater than or equal to the source bandwidth.

When additional bandwidth is needed between devices, increase the number of links between the connecting switches. The switch guarantees in-order-delivery with any number of links between chassis.

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59229-05 A

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Q-Logic 9100, 59229-05 A manual Bandwidth, Extended Credit Distances and Cable Lengths

59229-05 A, 9100 specifications

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