Schmid Watson Installation Guide Page 118

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SZ-DOC-W5-1.pdf LTU/NTU
Version: 1.5 Operating Manual
109 Revision: 2002-09-10
12 Firmware Download
12.1 Download Procedure
Application firmware download to LTU and NTU is carried out with a special Flashloader program
running on a PC.
During a remote download to the NTU via the LTU, the DSL link is not available for payload data
transfer. The DSL link is transparent forward between local V.24 and DSL in this case.
The loader program on the remote modem is started in the RAM (it cannot re-establish a DSL
link), it communicates over DSL timeslots and saves the new program in a backup area of the
flash memory on the NTU (secondary image area).
Note:
A DSL link disconnection or 8 failed retries during a remote download will cause reset and a
restart of the old application program at the remote site.
After successfully saving the new program, an indication flag in the old application FW of the
remote modem is set to status “valid but old”. Automatic reset of the remote modem will then
copy the new program from secondary to primary image area of the flash memory.
The remote downloading process uses an end-to-end flow control. Bit failures will cause a re-
sending of the last data package instead of re-starting the download procedure.
The application FW file includes a program type identifier. This identifier can be displayed by the
File Information command of the Flashloader program. The type identifier is evaluated by the
loader program on the target device as well. It checks if the firmware is allowed to run on the
target HW. If a wrong program is tried to be loaded, the downloading process will fail and gives
an error messages in the Flashloader program. The program type identifier is a 32 bit set, that
describes product and device type, e.g.
Product: Watson4, Watson5, Pegasus, etc.
Device: NTU, LTU_SINGLE, LTU_DUAL, REGENERATOR, etc.
The operator of the Flashloader program is responsible for choosing the right application
program file and version, as well as the correct addresses of the target devices. E.g. loading
Watson5 dual LTU application on a Watson4 dual LTU device will fail and leave the Watson4 dual
LTU device retrying to load the right program.
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