DSL routers, the most common form of DSL modem, the are external to the computer and wired to the computer's Ethernet port or its USB port, whereas voice-band modems are usually internal devices installed in the computer itself in a PCI interface slot in the back.
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It usually also has a USB jack which can be used to connect to computers via a USB cable, to allow connection to computers without an Ethernet port.
Its core markets are IPTV and broadband, It also sells handsets and other consumer products including DSL Modems and VoIP terminal adapters.