UM0934 datasheet(16/113 Pages) STMICROELECTRONICS

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Physical layer

UM0934

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Doc ID 17389 Rev 2

3.5.1

Data services

The data services provided by the physical layer allow the embedded MAC layer (in the case

of a MAC access point) or the external host (in the case of a PHY access point) to manage

data transfer on the power line.

Three primitives are available:

●

P_Data.Request(P_sdu): to ask the PHY layer for the transmission of data P_sdu

●

P_Data.Confirm(T_result): generated by the PHY layer as a response to a previous

P_Data.Request with the result of transmission (T_result)

●

P_Data.Indication(P_sdu): generated by the PHY layer as soon as data P_sdu coming

from the power line has been received.

Figure 3.

PHY data services

3.5.2

Alarm services

The alarm services provided by the physical layer allow the embedded MAC layer (in the

case of a MAC access point) or the external host (in the case of a PHY access point) to

manage alarm transfer on the power line.

Three primitives are available:

●

P_Alarm.Request(): to ask the PHY layer for the transmission of an alarm

●

P_Alarm.Confirm(T_result): generated by the PHY layer as a response to a previous

P_Data.Request with the result of transmission (T_result)

●

P_Alarm.Indication(): generated by the PHY layer as soon as an alarm coming from the

power line has been received.

P_Data.request

P_Data.indication

P_Data.confirm

PHY

Layer

PHY

Layer

Embedded MAC layer

or external Host

Embedded MAC layer

or external Host

Local Node

Remote Node

Power Line

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