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Publication 1747-RM001G-EN-P - November 2008

SLC Communication Channels 13-83

Figure 13.13 Applying DF1 Radio Modem Protocol

Figure 13.14 Store & Forward Table for Node 2

Node 4

No Bits

Node 3

1, 2, 4

Node 2

1, 3, 4

Node 1

No Bits

CMD 1

(DST = 4, SRC = 1)

REPLY 1

(DST = 1, SRC = 4)

CMD1

(1st Rebroadcast)

Note 1

(2nd Rebroadcast)

REPLY 1

CMD 1

(2nd Rebroadcast)

(1st Rebroadcast)

REPLY 1

Note 4

Note 2

Note 1 – The link layer of Node 1 blocks the re-transmission of a packet that is received with the SRC byte equal to the

receiving node’s station address. Packets received that originate from the receiving node should never be re-transmitted.

Note 2 – To prevent Node 2 from re-transmitting a duplicate packet, the link layer of Node 2 updates the duplicate packet

table with the last 20 packets received.

Note 3 – The link layer of Node 4 blocks the re-transmission of a packet that is received with the SRC byte equal to the

receiving node’s station address. Packets received that originate from the receiving node should never be re-transmitted.

Note 4 – To prevent Node 3 from re-transmitting a duplicate packet, the link layer of Node 3 updates the duplicate packet

table with the last 20 packets received.

Note 3

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