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SOPHO-LAM P375.
Two data ports are only able to communicate correctly with each other if they use the same
data port set-up. This is:
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Transmission mode (synchronous/asynchronous);
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Conversation mode (full/half duplex);
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Transmission speed;
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Data format (byte length, stop bits, parity);
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Terminal rate adaption method;
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Terminal rate adaption options (flow control, Network independent Clock).
Only in this case are the data bits and the control signals transmitted and received in the same
fixed positions in the frame structure.
It may be necessary for a DTE to be connected with other DTEs employing different data port
set-ups. The use of `data profiles' makes it possible to connect normally incompatible parties.
A data profile is a data port set-up that can be used for the duration of a single data call. The
profile is used to temporarily change the set-up of the local data port according to a set-up as
used by another remote DTE. A data profile contains a complete data port set-up.
Four profiles can be defined. A profile must also be allocated to an entry in the name directory
of the DCE.
When either an incoming call from or an outgoing call to another DTE is made, the DCE
automatically changes the data port set-up to that of the profile; the two data ports are
compatible.
When a call is initiated using the name directory and a profile is assigned to the name then the
data port set-up is adjusted according to the information in the profile. With an incoming call,
the DCE checks the received calling party identification. If the received number is stored in
the directory and a profile is assigned to it, then the data port set-up is adjusted according to
the information in the profile.
The information in the profile is only valid for the duration of one data call. After releasing the
call, the set-up of the data port is restored to the local programming as was used before the
profile changed the set-up.
More details on profiles are contained in the User Guide/Data Guide of the DCE.
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