Glossary
Access network:
Telecommunication facilities (i.e., wire cable, optical fiber, or wireless) used to connect subscribers to the first network node (i.e., central office, head end, or ISP server).
Adaptive differential PCM:
At the source, the current sample from the input waveform is subtracted from a predicted value derived from the weighted average of several previous samples and the last two predicted values. The difference is applied to a 4-bit adaptive quantizer. At the receiver, an inverse quantizer forms a difference signal which, with the output of an adaptive predictor, updates the value of the signal estimated by the receiver.
Address resolution protocol (ARP):
A protocol to resolve the IP address of a node and its hardware (MAC) address.
Advanced Television Systems Committee Standard ATSC-A/53:
Describes digital television signals used in United States. Adopted by the FCC in 1996, ATSC-A/53 provides a wide screen format that employs 1920 × 1080 pixels (i.e., a video image using 1080 lines each 1920 pixels long). The video signal is compressed using MPEG-2 or MPEG-4 coding. The video stream is modulated depending on the mode of transmission. Terrestrial broadcasters use 8-VSB AM while cable broadcasters employ 64- and 256-QAM.
Aggregation network:
Network between the access and core networks that combines (aggregates) or separates traffic from/to the access network to/from the core network or another access network.
Analog Signal:
With the passage of time, ...
