Regarding Ethernet or 10GBASE-T, since 2017 [10GBASE-T, finally popular?], we delivered all 11 episodes and 2 extra episodes.However, twisted pair copper wiring Ethernet is up to 10GBASE-T, and 25/40GBASE-T has not yet been put into practical use.As introduced last time, the transceiver module standards used in 10GBASE were used in the order of XENPAK → X2 → XFP → SFP+.This time it will be the second part.There are no specific regulations regarding the weight, and most of the products on the market actually weigh several tens of grams, and there are not many that exceed 100g.However, there were quite a few products such as the "XFP Twinax Cable" introduced last time, which were provided by integrating the cable and the module, so the weight regulation may not be very meaningful.By the way, "XFP MSA" released "XFP Revision 3.1 Adapted Revision" in 2003, "Revision 4.0" on April 13, 2004, and "Revision 4.5" on August 31, 2005. It isHowever, the activity as XFP MSA seems to have ended in August 2005 when Revision 4.5 was released.Only three XFP MSA press releases were issued in 2002, and even on the XFP MSA site, only Revision 3.1 was distributed (the website itself survived until 2009).However, the changes after 3.0 are as follows, and there is not much change.Releases after 4.0 will be distributed by the SFF Committee (which later became SFF-SIG and is now integrated into SNIA) instead of the XFP MSA, and the document number "INF-8077i" will also be used. attached.The XFP MSA was in charge of formulating the specifications, and the SFF Committee was in charge of distribution. I thinkThe latest version, Revision 4.5, is available from SNIA's SFF Specifications.The following "SFP+ (Small Formfactor Pluggable Plus)" is a standard that gradually replaced XFP and is still widely used today.This SFP+ was also released as "SFF-8431" by the SFF Committee, and "Public Draft Revision 1.0" was first released in June 2006, and "Revision 4.1", which was finally standardized, was announced in July 2009. rice field.After that, "Revision 4.1 Addendum" was added in September 2013.The SFP+ specification was developed by the SFF Committee itself.The member companies involved in developing the specification include AMCC, Amphenol, Arista Networks, Avago, Broadcom, Cinch, Clariphy, Cortina Systems, EMC, Emulex, ETRI, Finisar, Foxconn, Fujitsu CPA, Hewlett Packard, Hitachi GST, JDS Uniphase. , Luxtera, Molex, NetLogic uSyst, OpNext, Panduit, Picolight, QLogic, Samsung, Sumitomo, Sun Microsystems, Tyco, Vitesse Semiconductor and WLGore.By the way, since it is written as SFP+, the SFP that is the basis of it is as introduced in the previous series "From 10 Mbps "MII" to 1000 Mbps Cisco proprietary standard "SGMII"".According to its specifications, the size is 56.5 x 13.7 x 8.6mm (by the way, the insertion part into the cage is 45 x 13.7 x 8.6mm), which is slightly slimmer than the XFP.The electrical interface uses RMII for 100Mbps and SGMII for 1Gbps, making it possible to use 1Gbps Ethernet while maintaining a 20-pin connector.SFP+ is a standard devised to pass 10Gbps while maintaining compatibility with this SFP module.ZENPAK/X2/XFP were all proprietary standards and were not compatible with existing 100M/1G transceivers.By having compatibility here, we are trying to improve the convenience of the end user.So, the mechanical shape and connector layout remained the same as the SFP, and only the signal passing through became SFI.SFI is defined in SFF-8431 as “the name of a high-speed signal that connects between the host and the SFP+ module”, but in short it is XFI.SFI is a signal with an impedance of 100Ω that can be pulled around a maximum of 300mm on the FR4 board, and the electrical characteristics are practically the same as XFI.XFI is a term for XFP, and as SFP+, it was necessary to redefine it again, so I guess it was named SFI.Power consumption was even more difficult than XFP.There are two "Power Level I Module" and "Power Level II Module", the former is only 1W and the latter is only 1.5W.Actually, at this point in time, the 10GBASE-T module in 2009 was annihilated because the controller alone consumes 2 to 3W, but on the contrary, it seems that it was decided that this could be handled with regard to the optical module.As an aside, this SFP+ is still in the Draft stage, and “10GSFP+CU” was added as an option.This is for handling 10GBASE-CX with SFP+, introduced in "Coaxial-based '10GBASE-CX4' and SFP-adopted '10GSFP+CU' spread ahead of others".This is contained in Appendix E of SFF-8431, but in "Revision 2.1" issued in August 2007, Appendix E itself is still blank, and in "Revision 2.2" in December 2007, to some extent added up to, and brushed up in May 2008 "Revision 3.0".In a previous article, I wrote, "Actually, from the end of 2008 to 2009, some vendors stopped or froze 10GBASE-T compatible products and started announcing products with 10GSFP+CU instead." , which was based on this Revision 3.0.I think that it is a great achievement that 10GBASE-CX can be used as a relay until the spread of 10GBASE-T due to the spread of this.As an aside, recently, the power consumption of 10GBASE-T controllers has decreased, so there are some that can fit in SFP+ modules, but some of them are also available in 2.5GBASE-T/5GBASE-T There are compatible products (eg Mikrotik's "S+RJ10").In this case, the balance will not match unless the SFI speed is lowered, but at least the SFF-8431 does not have such an option at the moment (1.25GBd Option is added in Appendix F, but this inconsistent in terms of performance).Freelance technical writer.His expertise spans a wide range of fields, from CPUs, memories, and chipsets to communications, OS, databases, and medical-related fields.Homepage is http://www.yusuke-ohara.com/10GBASE transceiver module standard shifted from XENPAK→X2→XFP→SFP+10GBASE transceiver module standard shifted from XENPAK→X2→XFP→SFP+From 10Mbps "MII" to 1000Mbps Cisco proprietary "SGMII"Copyright ©2018 Impress Corporation.