US Robotics 56k

• V.90 ITU 56 Kbps
• x2™ technology 56 Kbps download
  ITU V.34 33.6 Kbps
• Compatible with ITU and Bell standards
• V.42/MNP 2-4 error control, V.42 bis/MNP 5 data compression
• Faxing: Class 1 and 2.0 Group III 14.4 Kbps send and receive

Zoom 56k

• Supports both V.90 and K56flex for up to 56,000 bps downloads
• 14,400 bps Group 3, Class 1 fax, Voice mail
  Software upgradeable
• Distinctive Ring Support
• ZoomGuard^TM lightning protection
• V.80, H.323, and H.324 compliant