(180-16-4) Introduction to DOCSIS

The International Telecommunication Union (ITU).

The first version of the Data Over Cable Service Interface Specification (DOCSIS) was approved as an international standard by what organization?

Time division multiple access (TDMA).

What communications 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 radio frequency (RF) return path?

Compliance with the DOCSIS standard and interoperability between suppliers.

What criteria does the Data Over Cable Service Interface Specification (DOCSIS) certification process ensure?

Orthogonal frequency division multiplexing (OFDM) and low-density parity-check (LDPC).

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?

Quality of service (QoS) controls, enhanced security, and adaptive equalization in the upstream path.

What requirements were needed for PacketCable to deliver a quality and reliable telephone service over a Data Over Cable Service Interface Specification (DOCSIS) access network?

From the cable modem termination system (CMTS), which interfaces with the operations support system (OSS) and acts as a proxy or messenger that transfers messages and files between the modems and the respective servers.

Where do Data Over Cable Service Interface Specification (DOCSIS) modems receive their configuration files, billing system messages, and access control messages from?

DOCSIS 3.0.

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 megahertz (MHz) in order to create enough bandwidth for upstream carriers from modems running on previous DOCSIS versions?

The Physical and Data Link Layers.

Which Open Systems Interconnection (OSI) reference model layers does the Media Access Control (MAC) Layer in the Data Over Cable Service Interface Specification (DOCSIS) overlap so that the media access control (MAC) can be used by the cable modem termination system (CMTS) to differentiate between cable modems?

Layers 1 through 4 (Physical Layer, Data Link Layer, Network Layer, and Transport Layer) are applied between the DOCSIS modem and CMTS.

Which layers of the Open Systems Interconnection (OSI) reference model are specific to cable networks and are present only between Data Over Cable Service Interface Specification (DOCSIS) modems and the cable modem termination system (CMTS)?

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.

Why are the data throughput rates for both downstream and upstream in Data Over Cable Service Interface Specification (DOCSIS) networks asymmetrical?