Industrial Communication Systems

61-6 Industrial Communication Systems

• No operation: 1 byte option used as ller between the options and as padding.

•

End of options:

1

byte

option

used

as

padding

at

the

end

of

options

led.

Data

portion

of

the

se

gment

fo

llows

im

mediately.

• Maximum segment size (MSS): Option denes the maximum size of a chunk of data

that can be received. It refers to the size of data not the whole segment. It is used only

during the establishment of the connection. e receiving party denes the maximum

size of thedatagram sent by the sender. If not specied, the default maximum is 536.

Because the length of the datagram is not specied in the TCP header, there is no length

limitation for an individual TCP packet. However, the MSS value that is nego