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This part of IEC 62148 defines the physical dimensions and interface specifications for directly modulated laser (DML) devices used in optical telecommunication and optical data transmission applications. The intent of this document is to adequately specify the physical requirements for DML devices so as to enable mechanical interchangeability of laser devices or transmitters complying with this document both at the printed circuit board and for any panel-mounting requirements. The document contains dimensional drawings of the various connector elements, outline dimensions, and pin assignments. There are no restrictions on the scope of application of the document. The standard increases investment security for manufacturers and users through its application and provides testing laboratories and manufacturers with defined specifications for testing, ensuring compatibility across manufacturers.