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The HMS Physical (PHY) Layer Specification describes the physical layer portion of the protocol stack used for communication between HMS-compliant transponders interfacing to managed outside plant network elements (NE) and a centralized head-end element (HE)
It specifies the minimum information necessary for the exchange of materials
What is BS 7755-3
which was withdrawn upon publication of BS 6143-2
the operating conditions and operating cycles in Annex B can be used in such cases
Ships and marine technology. Ship's mooring and towing fittings. Cruciform bollards Ingestion-build-266356 The HMS Physical (PHY) Layer1 Scope This document specifies the types, nominal sizes, dimensions and materials, as well as construction, manufacturing and marking requirements, for cruciform bollards suitable for installation on sea going vessels to meet normal mooring and towing requirements.