Introduction

This section summarises technical specifications for operation of Multimedia Over Coax Alliance (MoCA) devices (“nodes”) using in-home coaxial wiring for transport of multimedia content. The section describes the MoCA node protocol stack and physical network model.

The MoCA system network model creates a coax network which supports communications between a convergence layer in one MoCA node to the corresponding convergence layer in another MoCA node. The protocol stack of a MoCA node is shown in Figure 1-1. The MoCA specification does not include layers above the convergence layer.

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MoCA 1.1 Specification for Device RF Characteristics

More about MoCA

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Figure 1-1: MoCA Node Protocol Stack

Physical Network Model

Typical in-home coaxial networks are configured as a branching tree topology.  The point of connection  to the first splitter is called the Root Node. The MoCA nodes inside the home communicate with each other by having their signals traverse across one or more splitters. The signal path transmission between two MoCA nodes is the superposition of several individual paths. Each individual signal path may have a different magnitude and delay resulting in an aggregate signal path with frequency nulls, large attenuation, and significant delay spread. The MoCA Network will operate under these channel conditions.

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Figure 1-2: A Typical In-home MoCA Network

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Objects

MoCA object in its DML layer: 

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moca_GetIfConfig / moca_SetIfConfig
moca_IfGetStaticInfo
moca_IfGetDynamicInfo
moca_IfGetStats
moca_GetNumAssociatedDevices
moca_GetAssociatedDevices
moca_FreqMaskToValue
moca_GetMocaCPEs
moca_HardwareEquipped

Useful links:

MoCA 1.1 Specification for Device RF Characteristics

MoCA - The Technology Standard