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The small form-factor pluggable double density (SFP-DD) multi-source agreement is a standard published in 2019 for doubling port density. According to the SFD-DD MSA website: "Network equipment based on the SFP-DD will support legacy SFP modules and cables, and new double density products." [48] SFP-DD uses two lanes to transmit.
SFP-DD modules are used for high-density applications that need to double the throughput of an SFP Port. SFP-DD is defined by the SFP-DD MSA and enables breakout to two SFP ports. Two rows of electrical contacts enable doubling the throughput of SFP modules in a similar fashion as QSFP-DD. The quad small form-factor pluggable (QSFP) module ...
QSFP28 modules use the CAUI-4 electrical interface. SFP-DD or Small Form-factor Pluggable – Double Density modules use the 100GAUI-2 electrical interface. Cisco's CPAK optical module uses the four lane CEI-28G-VSR electrical interface. [127] [128] There are also CXP and HD module standards. [129] CXP modules use the CAUI-10 electrical interface.
The technical details of coherent optical modules were proprietary for many years, but have recently attracted efforts by multi-source agreement (MSA) groups and a standards development organizations such as the Optical Internetworking Forum. Coherent optical modules can either plug into a front panel socket or an on-board socket.
An optical module is a typically hot-pluggable optical transceiver used in high-bandwidth data communications applications. Optical modules typically have an electrical interface on the side that connects to the inside of the system and an optical interface on the side that connects to the outside world through a fiber optic cable.
[10] [11] These modules were preceded by Medium Attachment Units connected via Attachment Unit Interfaces to switches [12] [13] and have evolved over time: the first modules were Gigabit interface converters, followed by XENPAK modules, SFP modules, XFP transceivers, SFP+ modules, QSFP, [14] QSFP-DD, [15] and OSFP [16] modules. Pluggable ...
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