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Each byte is checked for parity or framing errors. If a parity error is detected and
ignore parity is not configured, or if a framing error is detected, the parity error
substitution character is stored in a system buffer. The "bad" character is echoed to
the device if echoplex is in use. If the port is configured for 7-bit data, the 3708
removes the parity from the character by placing a zero in the high order bit.
If either user-defined or default translation is specified, the received character is
translated.
Note:
Before a session is established, default translation is enforced.
After the character is translated, it is stored in a system buffer. The translated data
character is tested to see if it is a LT A character. If the current receive transaction is
terminated, the data contained in the current system buffer is transmitted to the
host. If the character is not a L T A character, the system buffer is checked to see if
it contains 256 bytes. (The maximum RU size for the 3708 is 256 bytes). If it does,
the accumulated data is forwarded to the host as a first or middle chain element.
After processing characters from the queue, the following actions can occur:
• Any data on the write queue that is waiting to be transmitted is sent to the
downstream device.
• If the 3708 is still in receive state (the last character processed was not aLTA
character), the text timer is started.
• The inactivity timer is started, if specified.
Chapter 5. 3708 Protocol Enveloping Mode
5-13
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