You have a small business customer who wants to use a voice

You have a small business customer who wants to use a voice over IP (VoIP) system and subscribe to this service through his ISP using DSL. What special piece of equipment will need to be installed to provide analog-to-digital signal conversion between the phones and the digital network?

A. A cable modem

B. A DSL modem

C. An Integrated access device (IAD)

D. A multimedia terminal adapter (MTA)

Solution

a cable modem is anetwork bridge and modem connects bi-directional data communication radio frequncy channel on a hybrid fibar co axial and radio frequncy over glass infra structure.

A digital subscriber line (DSL) modem is a device used to connect a computer or router to a telephone line which provides the digital subscriber line service for connectivity to the Internet.

An Integrated Access Device (or IAD) is a customer premises device that provides access to wide area networks and the Internet.

A multimedia terminal adapter (MTA), or Home Phone modem, operates much the same as a cable modem, but an MTA can deliver Home Phone service in addition to High Speed Internet.

so answer is B. A DSL Modem