AES Semigas


18 January 2024

OIF unveils CEI-112G-XSR+-PAM4 Extended Extra Short Reach IA

The Optical Internetworking Forum (OIF) 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 112Gb/s PAM4 electrical interface for die-to-die (D2D) and die-to-optical-engine (D2OE) interconnect with bump-to-bump insertion loss up to 13dB at the Nyquist frequency and baud rate in the range 36-58Gsym/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 36Gsym/s and 58Gsym/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,” says OIF Physical and Link Layer Working Group chair David Stauffer of 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 112Gb/s (58Gsym/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,” he adds.

“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,” says Alphawave Semi’s Matt Brown, editor of the CEI-112G-XSR+-PAM4 IA.

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 7 February. These webinars aim to equip engineers, developers and industry professionals with a comprehensive understanding of CMIS.

Tags: OIF


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