CTA Broadband & Access Network Technologies 3

Question 1

What is the purpose of a DSLAM (Digital Subscriber Line Access Multiplexer) in a broadband network?

Accepted Answer

To aggregate multiple DSL subscriber lines at the central office or remote cabinet

Answer

To amplify DSL signals on long copper loops

Answer

To convert incoming fiber signals into DSL for distribution

Answer

To monitor DSL line quality and report faults to the NOC

Question 2

In broadband network planning, what does 'contention ratio' describe?

Accepted Answer

The number of subscribers sharing a fixed amount of available bandwidth

Answer

The ratio of fiber segments to copper segments in the access network

Answer

The ratio of upstream to downstream speed in an asymmetric connection

Answer

The frequency band ratio used in OFDM modulation for DSL

Question 3

What is G.fast technology as defined by ITU-T G.9700/G.9701?

Accepted Answer

A DSL technology using up to 212 MHz bandwidth over very short copper loops for speeds up to 1 Gbps

Answer

A fiber optic standard for enterprise LAN environments

Answer

A cable broadband standard for DOCSIS networks

Answer

A wireless broadband protocol using the 5 GHz unlicensed band

Question 4

Which broadband technology uses millimeter wave (mmWave) spectrum above 24 GHz to deliver multi-gigabit fixed wireless access?

Accepted Answer

mmWave 5G Fixed Wireless Access (5G FWA)

Answer

LTE-A (4G Advanced)

Answer

WiMAX (IEEE 802.16)

Answer

LMDS (Local Multipoint Distribution Service)

Question 5

In an HFC cable network, what does the term 'return path' or 'upstream path' refer to?

Accepted Answer

The frequency band used for subscriber upstream traffic from the home to the headend

Answer

The primary fiber path from the national backbone to the headend

Answer

The backup coaxial route activated during node failures

Answer

The management path between cable modems and the CMTS

Question 6

What is the primary advantage of symmetric broadband (equal upstream and downstream speeds) for enterprise customers?

Accepted Answer

Optimal support for cloud applications, VoIP, video conferencing, and off-site backups

Answer

Lower monthly service cost compared to asymmetric offerings

Answer

Longer maximum reach over copper infrastructure

Answer

Higher resistance to electromagnetic interference

Question 7

What is Broadband over Power Line (BPL) technology?

Accepted Answer

A technology that delivers broadband internet access over existing electrical power distribution lines

Answer

A fiber standard that uses power cables as conduit for fiber deployment

Answer

A DSL variant that uses power line frequencies for signal transmission

Answer

A UPS system designed to protect broadband equipment during outages