Digital Link DL3800 DS1, User Manual

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4-28 DL3800 DS1 Inverse Multiplexer User Guide—February 1999
4
RAM Software Options
RAM Software Options - Query RAM Software
This feature determines when a valid software image exists in RAM by
checking the CRC and image ID. The query indicates if the software can be
activated in the unit. This is important if a remote software download is
being done from a DL3900 to a DL3800 or the other way around.
The following response messages are possible:
RAM Image is valid.
- CRC is valid, Image ID is valid
RAM Image is active - no reboot necessary.
- CRC is valid, Image
ID is valid, but images are identical.
RAM Image is invalid (Product ID Error) xxxxxx
- CRC is valid,
Image ID is xxxxxx.
RAM Image is invalid (Size too small)
- Header indicated the code
buffer is too small.
RAM Image is invalid (Size too big)
- Header indicated the code
buffer is beyond its range.
RAM Image is invalid (CRC error)
- CRC is invalid.
An image ID is a string consisting of DL3800, DL3900, DL3800E, or
DL3800/DL3900. The image ID DL3800/DL3900 is reserved for use in a
future application.
This command does not activate the software if it is downloaded and is
pending activation, nor does it indicate the software revision of the
downloaded image.
Querying the Remote Unit is performed by Þrst logging into the remote
unit from the Main Menu, then navigating to this menu.
RAM Software Options - Activate RAM Software
This feature activates downloaded software by copying the code from
RAM to FLASH and then rebooting the unit. If a valid (that is, Image ID
and CRC are valid) software image does not exist in RAM, the command
fails and a reboot will not occur.
An extended loss of power causes the non-activated software download to
be lost.
Modifying this setting in the Remote Unit is performed by Þrst logging
into the remote unit from the Main Menu, then navigating to this menu.