FTDI HKS F-CON V RJ11 pro USB RS232 to RJ11 programming cable 16FT | eBay
Shop | StarTech.com USB to Serial Adapter - 2 Port - COM Port Retention - FTDI - USB to RS232 Adapter Cable - USB to Serial Converter (ICUSB2322F) - serial adapter - USB - RS-232 x 2
Shop | StarTech.com USB to Serial Adapter - 2 Port - COM Port Retention - FTDI - USB to RS232 Adapter Cable - USB to Serial Converter (ICUSB2322F) - serial adapter - USB - RS-232 x 2