LevelOne GSW-0890 user manual

Speed / Duplex Mode:

Display the speed and duplex of all port. There are three speeds 10Mbps, 100Mbps and 1000Mbps supported for TP media, and the duplex supported is half duplex and full duplex. If the media is 1Gbps fiber, it is 1000Mbps supported only. The status of speed/duplex mode is determined by 1) the negotiation of both local port and link partner in “Auto Speed” mode or 2) user setting in “Force” mode. The local port has to be preset its capability.

Default: None, depends on the result of the negotiation.

Flow Control:

Show each port’s flow control status.

There are two types of flow control in Ethernet, Backpressure for half- duplex operation and Pause flow control (IEEE802.3x) for full-duplex operation. The switch supports both of them.

Default: Disabled

Wait State:

For 10/100M ports, there is no side effect on this setting.

For Gigabit ports, setting of Wait-State will remove the issue with ignored pause frames but resolve in the minimum interframe gap being at least 14 bytes instead of the usual 12 bytes. This applies for uncongested traffic as well. The larger interframe gap will result in throughput rates less than 100%. For example, a stream of 64-byte frames and a stream of 1518-byte frames, their maximum throughput is 97.7% and 99.9% respectively.

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