Nowadays, there is an increasing demand for cables which can provide a lower-power means for operation on short fiber optic links or short copper connections such as the SFP+ direct attach cable that will be described in this article.
What Is SFP+ Direct Attach Cable
SFP+ direct attach cable is a fixed assembly that is purchased at a given length, with the SFP+ connector modules permanently attached to each end of the cable. SFP+ direct attach cable provides high performance in 10 Gigabit Ethernet network applications, using an enhanced SFP+ connector to send 10 Gbps data through one paired transmitters and receivers over a thin twinax cable or fiber optic cable. The 10G SFP+ direct attach cable is designed to use the same port as an optical transceiver, but compared with optical transceivers, the connector modules attached to the cable leave out the expensive optical lasers and other electronic components, thus achieving significant cost savings and power savings in short reach applications.
Characteristics of SFP+ Direct Attach Cable
SFP+ direct attach cable is a low cost alternative to traditional fiber and twisted-pair copper cabling in data center deployments. SFP+ direct attached cable provides better cable management for high-density deployments and enhanced electrical characteristics for the most reliable signal transmission. The outstanding advantages are listed as follows:
High speed—support 10 Gbps data rates with backwards compatibility to 1 Gbps
MSA compliant—direct attached compliant and fully conform to the SFP+ MSA specifications
Reliability—RoHS compliant with excellent EMI performance and high reliability
Space saving—offer the smallest 10 gigabit form factor and a small overall cable diameter for higher density and optimized rack space in 10G Ethernet uplinks and Fibre Channel
Cost saving—cost up to three times less than fiber optic solutions, while offering lower latency and consuming up to 50% less power per port than current copper twisted-pair cabling systems
Scalability and flexibility—provide enhanced scalability and flexibility as well as higher density for today's data centers and storage area networks
High speed—support 10 Gbps data rates with backwards compatibility to 1 Gbps
MSA compliant—direct attached compliant and fully conform to the SFP+ MSA specifications
Reliability—RoHS compliant with excellent EMI performance and high reliability
Space saving—offer the smallest 10 gigabit form factor and a small overall cable diameter for higher density and optimized rack space in 10G Ethernet uplinks and Fibre Channel
Cost saving—cost up to three times less than fiber optic solutions, while offering lower latency and consuming up to 50% less power per port than current copper twisted-pair cabling systems
Scalability and flexibility—provide enhanced scalability and flexibility as well as higher density for today's data centers and storage area networks
Types of SFP+ Direct Attach Cable
Generally speaking, SFP+ direct attach cable can be divided into active and passive versions. Active SFP+ direct attached cable is used in active optical system which includes electrically powered switching equipment, such as a router or a switch aggregator, to manage signal distribution and direct signals to specific customers. While passive SFP+ direct attached cable is used in passive optical network which does not include electrically powered switching equipment, but uses optical splitters instead, to separate and collect optical signals as they move through the network. Powered equipment is required only at the source and receiving ends of the signal. Passive cables are cheaper than active cables but have shorter range than active cables, which means that the subscribers must be geographically closer to the central source of the data.
Fiberstore SFP+ DAC Solution
Nowadays, SFP+ direct attach cable is tremendously popular in the market. Fiberstore provides three types of 10G SFP+ cable assemblies: 10G SFP+ passive copper twinax cable (PCC), 10G SFP+ active copper twinax cable (ACC), and 10G SFP+ active optical cable (AOC). Various lengths can be customized according to customers' requirements.
Originally published at http://www.sfp-transceiver-modules.com/wiki_list
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