UM0934 datasheet(98/113 Pages) STMICROELECTRONICS

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Extended functions

UM0934

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Doc ID 17389 Rev 2

7.3.2

Server

The ST7570 set as Server also accepts a CMD_RC_Request if the command is received

from the external host while a transmission, reception or repetition is in progress over the

powerline only; otherwise it refuses it. A positive or negative confirmation

(CMD_RC_Confirm(RC_Result)) is always generated.

If accepted, the node will start the Repeater Call mode at the beginning of the first timeslot

after the completion of the current transmission, reception or repetition.

During the Repeater Call mode, the Server listens for RC messages and may also transmit

a RC pattern.

The transmitting subtimeslot position is different according the local MAC address:

●

if the node is registered (address not equal to NEW), the transmitting position of the RC

message transmitted matches the local MAC address. The parameter “TxPosition” in

the CMD_RC_Request (Section 5.3.23) has to be equal to 0000h;

●

if the node is not registered (address NEW) or its local MAC address is higher, the

transmitting position of the RC message transmitted matches the parameter

“TxPosition” declared in the CMD_RC_Request (Section 5.3.23) message received.

During RC messages reception, the Server performs an estimation of signal (SRC) and

noise (NRC) by averaging the amplitude of signal and amplitude of noise on both channels

(f0 and f1):

Equation 4

The RC message is considered valid only if the SRC > NRC and SRC is greater than the RC

detection threshold passed in CMD_RC_Request(Section 5.3.23) or (if RC_THRESHOLD =

0) written into MIB object 000Ch (RC Threshold, Section 6.5.13).

Figure 27

shows and example of Repeater Call procedure for Server, with both received and

transmitted patterns.

Figure 27.

Repeater Call for Server

⎪

⎩

⎪⎪

⎨

⎧

CC = 3

i + 1

CC = 2

i + 2

CC = 1

i + 3

CC = 0

i + 4

i ‐ 1

i ‐ 2

CMD_RC_Reques t()

RE QUEST RE FUSED

RC MODE

REQUEST ACCEPTED

CMD _RC_Re quest()

NORMAL MODE

RC MOD E

NORMAL MODE

CMD_ RC_Confirm()

CMD_RC_Confirm()

RC pattern eventually received and

notified (S, N levels and TX position ) in

CMD _RC_Confirm()

RC pattern transmitted in subtimeslot

expressed in CMD_RC_Request()

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