I doubt this is a Perl document because

Summary
DuSLIC Infineons High Modem Performance Codec Introduction Modems that
+ use the regular telephone network are and will be the dominant techn
+ology for the internet access and other data applications. The reason
+s among others are inexpensive technology
[download]

Also, I am looking for a package to be downloaded not the documentation.

Thanks,
Ashok.