{{technical, date=August 2016
The SCTE Hybrid Management Sub-Layer (HMS) refers to a set of
specifications
A specification often refers to a set of documented requirements to be satisfied by a material, design, product, or service. A specification is often a type of technical standard.
There are different types of technical or engineering specificati ...
intended to support the design and implementation of inter-operable management systems for evolving HFC cable networks.
The HMS Physical (PHY) Layer Specification describes the physical layer portion of the
protocol stack
The protocol stack or network stack is an implementation of a computer networking protocol suite or protocol family. Some of these terms are used interchangeably but strictly speaking, the ''suite'' is the definition of the communication protoc ...
used for communication between HMS-compliant
transponders
In telecommunications, a transponder is a device that, upon receiving a signal, emits a different signal in response. The term is a blend of ''transmitter'' and ''responder''.
In air navigation or radio frequency identification, a flight trans ...
interfacing to manage outside plant network elements (NE) and a centralized headend element (HE).
The HMS
Media Access Control
In IEEE 802 LAN/MAN standards, the medium access control (MAC), also called media access control, is the layer that controls the hardware responsible for interaction with the wired (electrical or optical) or wireless transmission medium. Th ...
(MAC) Layer Specification describes the messaging and protocols implemented at the
Data Link Layer
The data link layer, or layer 2, is the second layer of the seven-layer OSI model of computer networking. This layer is the protocol layer that transfers data between nodes on a network segment across the physical layer. The data link layer p ...
(DLL), Layer 2 in the 7-layer ISO-OSI reference model, that support reliable and efficient communications between HMS-compliant transponders interfacing to managed
outside plant
In telecommunications, the term outside plant has the following meanings:
*In civilian telecommunications, outside plant refers to all of the physical cabling and supporting infrastructure (such as conduit, cabinets, tower or poles), and any asso ...
(OSP) network elements (NEs) and a centralized headend element (HE).