This document discusses various communication devices used for computer networks: - A Network Interface Card (NIC) and Wireless Network Interface Card (WNIC) allow computers to connect to wired and wireless networks respectively. - A modem converts digital signals from computers to analog for phone/cable lines, and vice versa, enabling data transmission over telephone or cable. - A hub and switch are used to connect multiple wired devices in a local area network (LAN), while a wireless access point performs a similar function wirelessly. - A router directs data traffic between networks, allowing multiple devices to share a single internet connection.

1. CHAPTER 3: COMPUTER
NETWORKS AND
COMMUNICATIONS
Communication Devices: Hardware Requirements and
Functions of Communication Devices

2. At the end of the lesson, student should
be able to:
Identify the devices needed for a computer network
communications:
 Network Interface Card (NIC)
 Wireless Network Interface Card (WNIC)
 Modem (internal & External)
 Hub / Switch
 Router
 Wireless Access Point

3. Communication Devices
 NIC is a communication device  WNIC is a communication device
that enables a computer or that enables a computer or
device to access a wired device to access a wireless
network network

4.  Modem is a communication device that  Hub is a communication device that
enables to transmit data over is used for connecting wired
telephone or cable line. Modem computers or devices on a Local
converts digital signals from your Area Network (LAN). A hub
computer into analog signals to send provides a common connection
over the phone lines and converts the point for nodes on a star network.
phones analog signals into digital for
the computer.
 In
Hub
Internal modem External modem
Switch

5.  Wireless Access Point is a  Router is a communication device
communication device that used that computers and transmits
for connecting wireless data to its correct destination on
computers or devices on a Local the network. A router allows
Area Network (LAN). multiple computers to share a
single high-speed internet
connection.