ZMODEM Transfers failing too many times 1

[PS2GT3]

Can anyone explain to me why 30% of the time ZMODEM transfer fails? It could be uploading or downloading, I have read and implemented various scripts using $XFERSTATUS from this group to ensure that I am transferring correctly and still 3 out of 10 times the transfer of data fails. We are using PSTN lines, it this the expected failure rate. Dail up and login always works but I can't seem to guarantee the transfers will go OK. Should I be retrying the transfer? if so how many times? Anyone had similar experiences?

 

[knob]

Do you only see the problem when you use a script, or does it also occur when you perform the transfer manually?


aspect@aspectscripting.com

http://www.aspectscripting.com

 

[PS2GT3]

Yes it happens with manual transfer but only on large files i.e. 1.8Mb Zipped. Should I use an alternative protocol which maybe manages compressed files better?

 

[knob]

Zmodem should have no problems with that file, but you can also try Kermit if the system you are connecting to has that protocol available.

Also, here is a technical bulletin that may help you diagnose a problem with the connection and/or your modem (they discuss the DOS version of Procomm, but most content is applicable to the Windows product):

http://www.aspectscripting.com/support/pcplus2/tb193.txt

Also, I saw on the Symantec forum where one of the original developers of ASPECT created an updated DLL to workaround the hard-coded limit of 20 CRC errors in the program. I could probably get you in touch with him and see if the new DLL is available for public consumption. That would most likely resolve this problem.

aspect@aspectscripting.com

http://www.aspectscripting.com

 

[PS2GT3]

Thanks Knob, I'll digest the tech bulletin and see if I can make any adjustments. Kind Regards