Introduction

Question 1

also known as Plain Old Telephone Service (POTS)

Answer 1

Public Switched Telephone Network (PSTN)

Question 2

is the wired phone system over which landline telephone calls are made

Answer 2

Public Switched Telephone Network (PSTN)

Question 3

The PSTN relies on ___

Answer 3

circuit switching

Question 4

Maximizing the bandwidth of a medium

Answer 4

Multiplexing

Question 5

Local exchange also called ___

Answer 5

Central Office

Question 6

An E.164 International Number has the format :

Answer 6

Country-Code Area-Code Exchange-Code Line-Number

Question 7

Idle or open circuit in the telephone circuit

Answer 7

On Hook

Question 8

Closed circuit or in use

Answer 8

Off Hook

Question 9

Ring-back signaling

Answer 9

440+480 with 2:4 cadence

Question 10

Busy

Answer 10

480+620 with 1/2:1/2 cadence

Question 11

Trunk busy

Answer 11

480+620 but 0.2:0.3 cadence

Question 12

Receiver off-hook

Answer 12

1400+2060+2450+2600 with 0.1:0.1 cadence

Question 13

Call duration consists of

Answer 13

set-up, voice and tear-down phases

Question 14

When a subscriber moves from one cell to another in a cellular system, this is called a

Answer 14

Handoff

Question 15

When a subscriber moves from

one city to another, this is

Answer 15

Roaming

Question 16

coordinates the cellsites and

implements signaling and handoffs

Answer 16

Mobile Telephone
Switching Office (MTSO)

Question 17

worldwide standard for cellular voice

Answer 17

GSM

Question 18

also uses the existing residential local loop technology. Inexpensive because no
need to pull new wires, but 1-pair voice-grade UTP is not designed for high-speed
transmission.

Answer 18

ADSL or Asymmetric Digital Subscriber Line

Question 19

Downstream and Upstream speed for ADSL

Answer 19

Downstream: 3 Mpbs
Upstream: 512 Kbps

Question 20

CATV originally meant

Answer 20

community antenna television

Question 21

were originally built to extend the reach of TV signals and improve over-the-air TV reception

Answer 21

Cable Systems

Question 22

Downstream and Upstream for digital signals over radio waves

Answer 22

Downstream: Headend-to-subscriber has 810 MHz of RF bandwidth

Upstream: Subscriber-to-headend has 37 MHz of RF bandwidth

Question 23

brings high-speed

optical fiber lines to the neighborhood

Answer 23

Cable modem service

Question 24

Bandwidth is shared by everyone in the neighborhood

Answer 24

Cable Modem Service

Question 25

Downstream and Upstream for cable modem service

Answer 25

Downstream speeds up to 5 Mbps.

Upstream speeds up to about 1 Mbps.