OIF Unveils CEI-112G-XSR+-PAM4 Extended Extra Short Reach Implementation Agreement, Paving the Way for Advanced Interconnectivity

Organization also releases C-CMIS IA, publishes AI network operations and 400ZR+ demo white papers and announces next CMIS webinar

Fremont, Calif. -- January 17, 2024 – OIF, where the optical networking industry’s interoperability work gets done, has published a new Implementation Agreement (IA) for Common Electrical I/O (CEI) CEI-112G-XSR+-PAM4 Extended Extra Short Reach.

The CEI-112G-XSR+-PAM4 IA specifies a 112 Gb/s PAM4 electrical interface for die-to-die (D2D) and die-to-optical-engine (D2OE) interconnect with bump-to-bump insertion loss up to 13 dB at the Nyquist frequency and baud rate in the range 36 Gsym/s to 58 Gsym/s. The intended applications encompass multiple-chip modules (MCM), co-packaged optics (CPO) and near-package optics (NPO) assemblies. It also details the requirements for the CEI-112G-XSR+-PAM4 extended extra short reach high-speed electrical interface with nominal baud rates between 36 Gsym/s and 58 Gsym/s using PAM4 modulation.

“The CEI-112G-XSR+-PAM4 IA represents a significant milestone, extending the reach of previously published XSR class specifications at this speed range,” said David Stauffer, OIF Physical and Link Layer Working Group Chair and Kandou Bus, S.A. “This IA empowers advanced interconnectivity solutions in die-to-die and die-to-optical-engine scenarios, supporting baud rates up to 112 Gb/s (58 Gsym/s). These specifications have the opportunity to revolutionize multiple-chip modules, co-packaged optics, and near-package optics applications, pushing the boundaries of high-speed data transmission.”

Matt Brown, editor of the CEI-112G-XSR+-PAM4 IA and Alphawave Semi, added, “The CEI-112G-XSR+-PAM4 IA addresses a gap in the set of OIF CEI specifications to address new applications identified by the diverse membership of the OIF.”

OIF also recently released the Coherent Common Management Interface Specification (C-CMIS) IA 1.3, published an Application of Artificial Intelligence (AI) to Enhanced Network Operations technical white paper, published the ECOC 400ZR+ demo white paper and launched a series of CMIS technical webinars.

C-CMIS IA 1.3: This Implementation Agreement extends the Common Management Interface Specification [CMIS] to allow the management of digital coherent optics (DCO) modules. Initially covering 400ZR modules, this IA supports the management of modules that have a single data path with an eight-lane host interface for a 400GBASE-R Ethernet signal and a single-lane 400G coherent media interface based on the 400ZR specification. Future extensions to accommodate other DCO modules are anticipated.

Application of Artificial Intelligence (AI) to Enhanced Network Operations Technical White Paper: This new white paper addresses the interoperability requirements for enhanced network functions that interface between transport networks and their management-control systems. It identifies various use cases for applying AI to guide interoperability and provides insights into data requirements, processing needs, output specifications and interfaces relevant to each use case.

ECOC 400ZR+ Demo White Paper: This paper presents the methodology and results of an interoperability study of OpenZR+ MSA QSFP-DD transceivers conducted during the ECOC 2023 plugfest. Ten different transceivers were cross-connected in a matrix of transmitter-to-receiver combinations using a noise-loaded link to characterize the penalties associated with supplier interoperability. Individual transceiver performance was tested using 400GE traffic over a shortened optical line system link with a DWDM 75GHz fixed channel grid and a separate configuration to capture the transmitter error vector magnitude (EVM) performance. The transceiver receiver OSNR performance is compared against the transceiver transmitter EVM performance for each vendor.

CMIS Technical Webinar Series: OIF is hosting a series of free, public CMIS tutorial webinars. The next webinar, “Data Path State Machine (DPSM) and Application Advertising,” will be held on February 7th. These webinars aim to equip engineers, developers and industry professionals with a comprehensive understanding of CMIS. More information on the series can be found here.

About OIF

OIF is where the optical networking industry’s interoperability work gets done. With more than 25 years of effecting forward change in the industry, OIF represents the dynamic ecosystem of 150+ industry leading network operators, system vendors, component vendors and test equipment vendors collaborating to develop interoperable electrical, optical and control solutions that directly impact the industry’s ecosystem and facilitate global connectivity in the open network world. Connect with OIF at http://www.oiforum.com.