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10 Gigabit Ethernet Cabling Solutions: 10GBASE-T vs. SFP+
Oct 28th 2015 at 12:02 AM
10GBASE-T SFP+ 10GBASE-T vs. 10G SFP+
- Latency—10GBase-T PHY standard uses block encoding to transport data across the cable without errors. This block encoding requires a block of data to be read into the transmitter PHY, a mathematical function run on the data before the encoded data are sent over the link. The reverse happens on the receiver side. The standard specifies 2.6 microseconds for the transmit-receive pair, and the size of the block requires that latency to be less that 2 microseconds. In contrast, SFP+ uses simplified electronics without encoding, and typical latency is around 300 nanoseconds (ns) per link.
- Distance—10GBase-T can reach 100 meters using the latest Cat 6A or Cat 7 cables. As for SFP+ interfaces, for longer runs, fiber optic transceivers and fiber cables can be intermixed with DACs, allowing distances of 300 meters at a reasonable cost and up to 80 kilometers at a higher cost.
- Power Consumption—When it comes to power consumption, early versions of 10GBASE-T switches required up to 12 Watts per port, but switch vendors now offer a range of 1.5 to 4 W per port depending on distance due to recent advancements. By comparison, SFP+ interface uses less power—typically less than 1 W per port.
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