Table of Contents
Advertisement
image network provides image service alone. Each user using different communication
services has a special set of independent use access lines, user-network interfaces, and
terminals for each service. This leads to much waste. The concept of ISDN simply
solves this problem logically, that is, an integrated network is used to substitute
multiple separate private Networks.
A.10 Media Access Control (MAC)
It is the sub-layer of an Ethernet data link and is responsible for shared media access
processing.
A.11 Management Information Base (MIB)
The set of objects users may gain access to by means of a network management
protocol (for example, SNMP).
A.12 Network-Network Interface (NNI)
ITU-T standard interface between nodes within the same network. The ATM
association stipulates 2 kinds of standards: One used for private network and called
PNNI while the other used for public network and called a public NNI.
A.13 Power Spectral Density (PSD)
An electrical parameter which describes power distribution of signals within a certain
frequency domain.
A.14 Quadrature Amplitude Modulation (QAM)
Data transmitted are splittered within a bit/symbol coder into 2 channels (with half of
the original rate), which multiply by a pair of quadrature modulation components. Then,
they are summed and output. The QAM receiver needs an input signal with the same
spectrum and phase characteristics used for decoding. It employs a self-adaptive
equalizer to compensate signal distortion during the transmission.
Erro! Estilo não definido. Erro! Estilo não definido.
A-3
Advertisement
Table of Contents
