HSD Customer service Question and
answers verified to pass
The first version of the Data Over Cable Service Interface Specification
(DOCSIS) was approved as an international standard by what organization? -
correct answers The International Telecommunication Union (ITU).
What criteria does the Data Over Cable Service Interface Specification
(DOCSIS) certification process ensure? - correct answers Compliance with
the DOCSIS standard and interoperability between suppliers.
What layers of the Open Systems Interconnection (OSI) reference model are
applied between Data Over Cable Service Interface Specification (DOCSIS)
modems and the cable modem termination system (CMTS)? - correct
answers Layers 1 through 4 (Physical layer, Data Link Layer, Network Layer,
and Transport Layer) are applied between the DOCSIS modem and CMTS.
What access technology does the first version of the Data Over Cable Service
Interface Specification (DOCSIS 1.0) use to send data upstream over the
network's RF return path? - correct answers Time division multiple access
(TDMA).
What was added to the first Data Over Cable Service Interface Specification
(DOCSIS) that enabled broadband cable operators to provide telephone
service with quality and reliability that rivaled the products of the traditional
telephone companies? - correct answers Quality of service (QoS) controls,
enhanced security, and adaptive equalization in the upstream path.
What features were introduced with the 3.1 version of the Data Over Cable
Service Interface Specification (DOCSIS 3.1) to increase the downstream and
upstream data throughput? - correct answers Orthogonal frequency division
multiplexing (OFDM) and low-density parity-check (LDPC).
, Which Data Over Cable Service Interface Specification (DOCSIS) version was
the first to provide an option for raising the top frequency of the upstream
spectrum to 85 MHz in order to create enough bandwidth for upstream
carriers from modems running on previous DOCSIS versions? - correct
answers DOCSIS 3.0.
Why are the data throughput rates for both downstream and upstream in Data
Over Cable Service Interface Specification (DOCSIS) networks asymmetrical?
- correct answers Because the narrower bandwidths and lower orders of
modulation for the return path carriers cause the DOCSIS downstream and
upstream data rates to be unequal or asymmetrical.
Which Open Systems Interconnection (OSI) reference model layers does the
MAC Layer in the Data Over Cable Service Interface Specification (DOCSIS)
overlap? - correct answers The Physical and Data Link Layers.
From where do Data Over Cable Service Interface Specification (DOCSIS)
modems receive their configuration files, billing system messages, and access
control messages? - correct answers From the cable modem termination
system (CMTS) acting as a "proxy" or messenger that transfers messages
and files between the modems and the respective servers.
What messages must a cable modem receive from the downstream signal in
order to begin a transmitting relationship with the cable modem termination
system (CMTS)? - correct answers An upstream channel descriptor (UCD)
message, a symbol timing message (SYNC), and a bandwidth allocation
message (MAP).
What instructions might a cable modem termination system (CMTS) send in a
RNG-RSP message to modify the modem's transmission parameters? -
correct answers An adjustment to the modem's timing interval, transmit
frequency, or power level
answers verified to pass
The first version of the Data Over Cable Service Interface Specification
(DOCSIS) was approved as an international standard by what organization? -
correct answers The International Telecommunication Union (ITU).
What criteria does the Data Over Cable Service Interface Specification
(DOCSIS) certification process ensure? - correct answers Compliance with
the DOCSIS standard and interoperability between suppliers.
What layers of the Open Systems Interconnection (OSI) reference model are
applied between Data Over Cable Service Interface Specification (DOCSIS)
modems and the cable modem termination system (CMTS)? - correct
answers Layers 1 through 4 (Physical layer, Data Link Layer, Network Layer,
and Transport Layer) are applied between the DOCSIS modem and CMTS.
What access technology does the first version of the Data Over Cable Service
Interface Specification (DOCSIS 1.0) use to send data upstream over the
network's RF return path? - correct answers Time division multiple access
(TDMA).
What was added to the first Data Over Cable Service Interface Specification
(DOCSIS) that enabled broadband cable operators to provide telephone
service with quality and reliability that rivaled the products of the traditional
telephone companies? - correct answers Quality of service (QoS) controls,
enhanced security, and adaptive equalization in the upstream path.
What features were introduced with the 3.1 version of the Data Over Cable
Service Interface Specification (DOCSIS 3.1) to increase the downstream and
upstream data throughput? - correct answers Orthogonal frequency division
multiplexing (OFDM) and low-density parity-check (LDPC).
, Which Data Over Cable Service Interface Specification (DOCSIS) version was
the first to provide an option for raising the top frequency of the upstream
spectrum to 85 MHz in order to create enough bandwidth for upstream
carriers from modems running on previous DOCSIS versions? - correct
answers DOCSIS 3.0.
Why are the data throughput rates for both downstream and upstream in Data
Over Cable Service Interface Specification (DOCSIS) networks asymmetrical?
- correct answers Because the narrower bandwidths and lower orders of
modulation for the return path carriers cause the DOCSIS downstream and
upstream data rates to be unequal or asymmetrical.
Which Open Systems Interconnection (OSI) reference model layers does the
MAC Layer in the Data Over Cable Service Interface Specification (DOCSIS)
overlap? - correct answers The Physical and Data Link Layers.
From where do Data Over Cable Service Interface Specification (DOCSIS)
modems receive their configuration files, billing system messages, and access
control messages? - correct answers From the cable modem termination
system (CMTS) acting as a "proxy" or messenger that transfers messages
and files between the modems and the respective servers.
What messages must a cable modem receive from the downstream signal in
order to begin a transmitting relationship with the cable modem termination
system (CMTS)? - correct answers An upstream channel descriptor (UCD)
message, a symbol timing message (SYNC), and a bandwidth allocation
message (MAP).
What instructions might a cable modem termination system (CMTS) send in a
RNG-RSP message to modify the modem's transmission parameters? -
correct answers An adjustment to the modem's timing interval, transmit
frequency, or power level
