Huawei releases Wi-Fi 6 router "HUAWEI WiFi AX3 NEW" compatible with IPoE IPv6 at 8,000 yen levelMSI Exhibits Wi-Fi 6E Gaming Wi-Fi Router at TGS 2022Regarding 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.First, let's talk about the OCP (Open Compute Project).It is a project launched by Facebook (now Meta), but the first design started in 2009.In 2011, it was released in the form of OCP, and the project started from here.The OCP first released on January 9, 2017, "Facebook: CWDM4-OCP 100G Optical Transceiver Specification".By the way, this is Spec Version 0.1, but in this state it is called Shared (shared), and this content is almost fixed.As for OCP, like IEEE, it doesn't seem to care about properly raising the version to 1.0.As for the CWDM4-OCP-100G, the specifications themselves are frighteningly simple.The base "CWDM4-100G" is defined by CWDM4 MSA and is also introduced in this article.“CWDM4-OCP-100G” has relaxed the specifications, and the specific differences are as follows.The first change is to reduce the reach from 2km to 500m."25Gbps × 4 is aggregated into one SMF to achieve 100Gbps, ``CWDM4 MSA'' with a reach of 2km and ``4WDM MSA'' with a reach of 10/20/40km" touched on Google's data center, and "400GbE is Facebook and Microsoft's DC operators take the lead, Beyond 400G Study Group insists on standardization of 1.6T at the same time as 800G” shows an example of Facebook's data center, but the data center itself is quite huge and has a reach of 500m. is not enough is the starting point of CWDM4 MSA.The next change is the behavior of Passive Cooling.For CWDM4-100G, more power is needed to achieve 2km range.In addition, since CWDM4 requires stable output of four wavelengths, active cooling was required for the module.This is related to the operating temperature range.The CWDM4-100G has an operating temperature range of 0 to 70 degrees Celsius.Since such an operating environment cannot be fully read on the CWDM4 MSA side, it is natural in a sense to give this degree of width.This relaxes the operating conditions of the light emitting/receiving elements, allowing transceivers to be constructed using less expensive elements.In short, the CWDM4-OCP-100G is based on the CWDM4-100G and is optimized for relatively short distance connections in the data center assumed by OCP.As a result, the minimum value of OMA Each Lane, "Tx OMA," is changed from -4 dBm (≒0.4 mW) to -5 dBm (≒0.3 mW), which is the minimum value of Launch Power, "Tx OMA -TDP” has decreased from -5dBm to -6dBm (≒0.25mW), and the reception sensitivity with a guaranteed BER of 5E-5 has also decreased from -10dBm (0.1mW) to -9.5dBm (≒0.11mW). It became possible to change the specification such as raising to.In addition, Link Loss has also been raised from 3.5dB to 5dB, making it possible to use even slightly poor quality SMF.By the way, on the transmission side, for example, Average Launch Power, which is the maximum output per lane, 2.5 dBm (≒ 1.78 mW), which is the value of each lane (max), and Total average launch power, which is the maximum output of all lanes The parameters themselves, such as power(max) of 8.5dBm (≒7.1mW), have not been changed.Therefore, it is of course possible to use the existing CWDM4-100G module as it is.However, these are only the maximum values, and in fact, it can be used even if the output is reduced more.Then, the power consumption is reduced by that amount, and the module capable of Passive Cooling is defined as CWDM4-OCP-100G.The question is, who will manufacture these modules and switches?That's the story, but when the specifications were announced, it became clear that ColorChip and II-VI Incorporated (formerly Finisar) would provide the transceiver module, and Edgecore Networks and Celestica would provide the switch.Unless you are building a data center according to the OCP specifications, it seems that there will be various troubles, but this "CWDM4-OCP-100G" has started to be distributed relatively widely as a low-priced 100G Ethernet standard. That's why.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/``100GBASE-AR'' and ``400GBASE-AR'' will be standardized in ``IEEE P802.3cw'' by defining PMD specifications in the middle of 2023?Based on "200GBASE-FR4" defined by IEEE 802.3bs, "200G-FR4-OCP" with increased reach to 3kmAchieving 100 Gbps by consolidating 25 Gbps x 4 into one SMF, "CWDM4 MSA" with a reach of 2 km and "4WDM MSA" with a reach of 10/20/40 km400GbE led by Facebook and Microsoft DC operators, Beyond 400G Study Group insists on standardization of 1.6T at the same time as 800GCopyright ©2018 Impress Corporation.