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TC12 General Handbook

666/HB/43100/000 Page 5-3 Issue 9

Figure 8 - MESSAGE FORMAT - FULL AND HALF DUPLEX

CONTROL

Control Message to all OTUs on the line

Reply from OTU 1

Reply from OTU 2 Reply from OTU 3

HALF DUPLEX

FULL DUPLEX

Control Message to all OTUs on the line

from OTU 1

from OTU 2

from OTU 3

from OTU 4

Inter message Gap

CONTROL

1 SECOND

Assume that our system comprises four OTUs and the data transmission rate is 300 Baud.

Referring to Table 1 it can be seen that for full and half duplex configurations five appears in the

column, this means that in a half duplex configuration the total number of Control and Reply bytes

is five. For a full duplex system the Replies start to come in whilst the Control message is being

transmitted, therefore in addition to the five Reply bytes, three Control bytes can also be supported

in the 1 second cycle time.

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