Perle 833IS, User Manual

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Appendix 5: Cisco Configuration Mode
Perle 833IS User Guide 297
through Cisco commands you can delete files from the flash, the files are hidden and
still consume space on the
flash volume. Until the entire flash is erased, the memory
is still consumed by the hidden files.
If configuration of the 833IS is performed using the 833IS Manager, maintenance on
the
flash volume is not necessary. The Manager stores a single firmware image in the
flash volume and a single configuration file in the nvram volume. If the Manager
detects additional files in the
flash volume, a warning message is displayed and you
will be given the option to erase the entire flash volume or abort the download.
When configuration is performed in Cisco Management Mode, there is not extensive
checking done on the new configuration parameters. As each command is executed,
the configuration changes takes effect immediately. The advantage of building up a
configuration interactively is having each modification take immediate effect.
However, these command actions have no validity mechanism to ensure a logical
configuration is operating and not causing any disruption to the online session.
When the 833IS Manager downloads a new configuration to the 833IS it performs a
validity check on the configuration file beforehand. This prevents illogical
configuration parameters from being downloaded to the unit. Once a valid
configuration is successfully downloaded, the unit is required to be rebooted in order
for the new configuration to take effect. Unlike the dynamic interaction of the
configuration of 833IS using Cisco Configuration Mode, the 833IS Manager
maintains the unit’s integrity through validation methods.
Telnet sessions is the means of modifying and managing the 833IS in Cisco
Configuration Mode. Although this method is effective there are certain limitations
that Telnet has, which can affect the capability of certain Cisco and Perle commands.
Telnet restricts the text to characters that are supported by the 7 bit ASCII character
set. This restriction prevents the ability of entering “double byte”characters used in
the Japanese language and accented characters presented in many other languages.
This means that user names and passwords MUST contain only characters that are
available in the ASCII character set.
The 833IS Manager was designed with many language versions to handle this
scenerio. This Windows based application is available in 2 versions:
1) English Single Byte Character Set version which is available for all coun-
tries except Japan.
2) English Double Byte Character Set version which supports text field en-
try of Japanese Kanji characters and is only available for Japan.
The Manager is able to enter, view and download accented and “double byte”
characters. However, when these characters are viewed through a Telnet session
they will be incorrectly displayed.