V.92 specification allows a PCM upstream at rate from 24,000bps to 48,000bps. The rate increments in steps of 1.33 kbps as in V.90. Upstream rates could be 24k, 25.3k, 26.6k, 28k, etc. This is a 30% increase over the 33.6K bps attainable by V.90 modems. This higher upstream speed offers numerous benefits including a reduction in the upstream data transfer time for large e-mails with attachments and for ftp site uploads, as well as improved operation for interactive applications. Due to the real conditions of the phone lines the 48 kbps upstream is very hard to obtain.