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Hardware Based External 56K USB Modem - Bluetooth & Telecom Adapters | StarTech.com
US Robotics Courier V.Everything 56 Kbps ISA Internal Network Modem – Surplus Select
NeweggBusiness - U.S. Robotics USR5670 Fax modem 56Kbps PCI Bus (Plug & Play) V.92 56K ITU standard V.90 56K ITU standard V.34 33.6K ITU standard Compatible with most ITU and Bell standards
External USB 2.0 Fax/Data Modem 56K V.92 - Bluetooth & Telecom Adapters | StarTech.com
Asynchronous DSU, RS-232, DDS DSU
Action-Tec EX560LKA 56 Kbps for sale online | eBay
Amazon.com: U.S. Robotics USR5638 Data Modem PCI - 1 x RJ-11 Phone Line - 56 Kbps : Electronics
D-Link 562E High Speed External Serial 56K Modem | Worthit
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Open Box: CNet CN5614XR External Data/Fax Modem 56Kbps RS-232 (Serial Port) V.92 and earlier ITU standards, Bell 103, Bell 212 Modems / Gateways - Newegg.com
19. Modems (cont'd) - Introduction to Data Communications