BDS DOCSIS Standards and Protocols

Question 1

What does DOCSIS stand for?

Accepted Answer

Data Over Cable Service Interface Specification

Answer

Digital Over-Cable Service Interface Specification

Answer

Direct Optical Cable Service Integration Standard

Answer

Digital Optical Communications Service Interface Standard

Question 2

What is the role of the CMTS in a DOCSIS network?

Accepted Answer

It terminates cable modem connections and bridges them to the IP network

Answer

It manages IP address allocation for end users

Answer

It amplifies RF signals in the distribution plant

Answer

It encodes video for downstream transmission

Question 3

How many downstream and upstream channels can DOCSIS 3.0 bond?

Accepted Answer

Up to 32 downstream / 8 upstream

Answer

4 downstream / 4 upstream

Answer

8 downstream / 4 upstream

Answer

Up to 24 downstream / 24 upstream

Question 4

What modulation technology does DOCSIS 3.1 introduce for the downstream?

Accepted Answer

OFDM (Orthogonal Frequency Division Multiplexing)

Answer

SC-QAM only

Answer

CDMA

Answer

DMT

Question 5

What is the purpose of the DOCSIS ranging process during modem initialization?

Accepted Answer

To adjust the modem's transmit power and timing so its upstream signals arrive correctly at the CMTS

Answer

To assign an IP address to the modem

Answer

To download the modem configuration file

Answer

To scan for available downstream channels

Question 6

What file does a cable modem download during initialization to receive its service configuration?

Accepted Answer

config.cfg (DOCSIS configuration file via TFTP)

Answer

firmware.bin

Answer

startup.xml

Answer

modem.json