76
6 F 3 B 0 3 6 2
Figure 6.7 Transmission Data Fragmentation in the TCP Socket Interface
g. When the transmission data is fragmented as discussed above, the amount of data transferred
to the T2N in a TCP socket interface receive request differs depending both on the timing with
which the T2N issues the receive request and the timing with which the data arrives at the
Ethernet Port.
h. To handle single units of transmission data on the receiving side as single units as well, the
user software on the receiving side must recognize the end of the transferred data (either by
using counts in the transmitted data or by including an end marker in the transmitted data) and
iterate receive requests until all the transmitted data has been received.
i. User programs must store all incoming data so that the register area used to transfer
data to the T2N is not overwritten when using iterated receive requests.
Ethernet Port
Network
¯First receive
request
2000 bytes
ÀSend request
2000 bytes
Send side T2NEthernet Port
Á1460 bytes
Send side T2N
540 bytes
A A
BB
A
B
°Second receive
request
2000 bytes
1460 bytes
540 bytes
540 bytes
1460 bytes