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Active SFP+ Cables assemblies also incorporate Rx LOS and Tx Disable features

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The passive cable assembly design has no signal amplification in the cable assembly. Electronic Dispersion Compensation (EDC) is typically used on host board designs when passive SFP+ Cables copper assemblies are utilized. EDC allows for an extended length of passive cable assemblies. The industry standard EEPROM signature enables the host system to differentiate between a passive copper cable and a fiber optic module.The active cable assembly design has signal amplification and equalization in the assembly. Active copper assemblies are typically used in host systems that do not employ EDC. Active SFP+ Cables assemblies also incorporate Rx LOS and Tx Disable features. As with passive cables, the industry standard EEPROM signature enables the host system to differentiate between an active copper cable and a fiber optic module.
Limiting modules are preferred except when using old fiber infrastructure which requires the use of the linear interface provided by 10GBASE-LRM modules Also known as Direct Attach (DA), 10GSFP+Cu, 10GBASE-CR,[25] 10GBASE-CX1, SFP+, or 10GbE Cu SFP+ Cables. Direct Attach uses a passive twin-ax cable assembly and connects directly into an SFP+ housing. Twinax copper cable has a fixed-length cable, typically 1 to 7 m (passive cables) or up to 15 m (active cables) in length,[26][27] and, like 10GBASE-CX4, is low-power, low-cost and low-latency with the added advantages of GLC-T, Compatible Cisco SFP Transceive?r 1000Base-T GE CAT5 Copper 100M SFP using less bulky cables and of having the small form factor of SFP+.

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