Compaq T1500 - Windows-based Terminals - 72 MB RAM, Installation Manual

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Configuring Terminal Start-Up Resources
19 19 19 19
Files ending in a
.txt
name are treated as text files. Any other filename is treated
as an RFC-compliant file.
Use of this option requires a TFTP server. Since path names are included in the file,
the TFTP server must accept UNIX-style file separators, not DOS-style separators.
Likewise, the default transfer mode must be binary, and the file (either format) must
be capable of being read by the terminal without modifications (i.e., the terminal
does not accept carriage returns at the end of lines).
This provides the ability to give arbitrarily large option data to the terminal,
bypassing the limitations of the Maximum DHCP Message Size option and some
servers.
Option 43 Option 43 Option 43 Option 43
Option 43 is the industry-standard method for providing vendor-specific option data
to network devices. The three disadvantages are: the total length of option 43 (i.e.
all vendor specific options) is 255 bytes; the option data is typically hard to enter;
and some servers do not maintain different scopes of option data based upon
Vendor ID, Client ID, or other device-defining tag. The Option Ids for these options
are listed in an earlier table.
Options 128+
Options 128+ Options 128+
Options 128+
There is debate in the DHCP community about whether or not options 128 through
254 are for vendors’ use. If your server is incapable of sending different option 43
values based upon an identifier, if you can not use TFTP, if you do not want to edit
binary data, or if the total set of T1500 options is greater than 255 bytes, all T1500-
specific options are available as text strings in this option space. All T1500 options
have the prefix 0080_ and are described in an earlier table. By default (i.e., without
configuring), the terminals request none of the 127 options in this space. By
running Setup
Setup Setup
Setup, the set can be increased. Any T1500 option can be placed
anywhere in this option space, since the 0080_ tag is checked to determine
whether or not it is a valid option. If you know what option numbers are going to be
used, you can use Setup
Setup Setup
Setup to define the requested set to just this set of option
numbers; if you do not know, you can expose the entire option space.