Nortel 2000 Software Reference Manual page 246

Chapter 3 Using the CLI Commands
Remote Annex Administrator's Guide for UNIX
Book C-228
Use the following procedure to perform the two functions just
described:
• Use the terminal's set-up utility or edit termcap to set the
terminal's control codes to 7 bits and (optionally) to specify
a terminal model number that supports a numeric keypad.
VT100 emulation mode always uses 7 bits, although
not all set-up utilities indicate that
it does.
To access the set-up utility, press the appropriate key
(typically labeled Setup). Then choose the option that lets
you select a value for the emulation mode parameter. (On
VT200s, VT300s, and VT400s, the option is labeled General,
and the parameter you select is Mode. For Mode, select the
value VT400 7bit, VT300 7 bit, or VT200 7 bit.)
Instead of using the set-up utility, you can set the emulation
mode by editing the termcap file.
To set the emulation mode to VT200 7 bit, enter the following
string in an is control sequence in the portion of termcap that
corresponds to the terminal's term_var port parameter:
\E[62;1"p
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