Zoom Bluetooth Wireless 56K Modem for PDAs Notebooks & Other Computers 4300 NEW! | eBay
Amazon.com: StarTech.com USB 2.0 Fax Modem - 56K External Hardware Dial Up V.92 Modem/ Dongle/Adapter - Computer/Laptop Fax Modem - USB to Telephone Jack - USB Data Modem - Network Fax/CMR/POS (USB56KEMH2),Black :
Why is the maximum speed of a modem limited to 56 kbps? - Quora