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Transceiver module spec averts mismatching

Posted: 27 Mar 2015 ?? ?Print Version ?Bookmark and Share

Keywords:Rev. 3.0? transceiver? Style 3? P802.3bs? 400Gbit/s?

Rev. 3.0 of the 400Gbit/s (16 x 25Gbit/s) pluggable electrical-to-optical transceiver specification has been released, according to the announcement made by the CDFP Multi-Source Agreement (MSA) at OFC 2015.

The release includes mechanical specifications for a new Style 3 module that's intended for active optical cables based on proposed draft specifications from the IEEE P802.3bs 400Gbit/s Ethernet task force. Style 3 modules will use the same connectors as Style 1 and Style 2 modules, but Style 3 modules address an issue of mating with Style 1 and Style 2 receptacles. Style 3 modules will be mechanically keyed to prevent incorrect mating. Figure 1 shows the modules.

Keyed modules

Figure 1: Keyed modules prevent insertion into wrong sockets. (Source: CDFP MSA)

Figure 2, from the specification, shows the keying details.

Details of module keying

Figure 2: Details of the module keying. (Source: CDFP MSA specification Rev. 3.0)

CDFP electrical-to-optical interfaces support data rates of 25Gbit/s over 16 lanes. That's an aggregate data rate of 400Gbit/s through a single module. The CDFP 400Gbit/s interface specification defines short-body and long-body modules. Style 3 modules can be used with direct attach cables, active optical cables and optical modules.

- Martin Rowe
??EE Times

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