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The first number followed by M or G (e.g. 10M, 100M, 1G) represent the data transmission rates. The symbols after "base" indicate the interface types. The T stands for twisted pair followed by duplex mode (either half or full). The SR-LR is shorthand for "short-range" and "long-range" optical modules, it also includes all other variants like LRM, ER, ZR, etc. These link modes should be used with optical modules. The CR stands for twinaxial copper and should be used with direct attach cable (DAC). For 1Gbps DAC the 1G-baseT-fullbaseX link mode is appropriate. The last digit represent the number of lines, with "CR2" meaning two lines and "CR4" indicating four lines. The CCR2004-1G-2XS-PCIe device does not support fec91 on SFP28 interfaces. |
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