MC145572PB Freescale Semiconductor, MC145572PB Datasheet - Page 243

• Manufacturer Part Number: MC145572PB
• Manufacturer: Freescale Semiconductor

Specifications of MC145572PB

• Number Of Line Interfaces: 1
• Control Interface: HDLC
• Lead Free Status / Rohs Status: Not Compliant

Freescale Semiconductor, Inc.
dBmOp — Relative power expressed in dBmp. (See dBmO and dBmp.)
dBmp — Indicates dBm measurement made with a psophometric weighting filter.
dBrn — Relative signal level expressed in decibels above reference noise, where reference noise is 1 pW. Hence, 0 dBrn =
1 pW = – 90 dBm.
dBrnC — Indicates dBrn measurement made with a C–message weighting filter. (These units are most commonly used in the
U.S., where psophometric weighting is rarely used.)
dBrnc0 — Noise measured in dBrnc referenced to zero transmission level.
Decoding — A process in which one of a set of reconstructed analog samples is generated from the digital character signal
representing a sample.
Delay Distortion — Distortion that occurs on communication lines due to the different propagation speeds of signals at different
frequencies, measured in microseconds of delay relative to the delay at 1700 Hz. (This type of distortion does not affect voice
communication, but can seriously impair data transmission.)
Delta Modulation — A simple digital coding technique that produces a serial bit stream corresponding to changes in analog
input levels; usually utilized in devices employing continuously variable–slope delta (CVSD) modulation.
Demodulator — A functional section of a modem that converts received analog line signals to digital form.
DN — Directory Number.
Digital Telephone — A telephone terminal that digitizes a voice signal for transmission and decodes a received digital signal
back to a voice signal. (It will usually multiplex 64 kbps voice and separate data inputs at multiples of 8 kbps.)
Distortion — The failure to reproduce an original signal’s amplitude, phase, delay, etc. characteristics accurately.
DPSK — Differential Phase Shift Keying; a modulation technique for transmission where the frequency remains constant but
phase changes will occur from 90 , 180 , and 290 to define the digital information.
DTMF — Dual Tone Multi–Frequency. It is the “tone dialing” system based on outputting two non–harmonic related frequencies
simultaneously to identify the number dialed. Eight frequencies have been assigned to the four rows and four columns of a typi-
cal keypad.
Duplex — A mode of operation permitting the simultaneously two–way independent transmission of telegraph or data signals.
Echo — A signal that has been reflected or returned as a result of impedance mismatches, hybrid unbalance, or time delay.
Depending upon the location of impedance irregularities and the propagation characteristics of a facility, echo may interfere with
the speaker/listener or both.
Echo Suppressor — A device used to minimize the effect of echo by blocking the echo return currents; typically a voice–oper-
ated gate that allows communication one way at a time.
Encoder (PCM) — A device that performs repeated sampling, compression, and A/D conversion to change an analog signal to
a serial stream of PCM samples representing the analog signal.
Equalizer — An electrical network in which phase delay or gain varies with frequency to compensate for an undesired amplitude
or phase characteristic in a frequency–dependent transmission line.
ET — Exchange Termination (CO Switch).
FDM — Frequency–Division Multiplex; a process that permits the transmission of two or more signals over a common path by
using a different frequency band for each signal.
Four Wire Circuit — The portion of a telephone, or central office, that operates on two pairs of wires. One pair is for the transmit
path (generally from the microphone), and one pair is for the receive path (generally from the receiver).
Frame — A set of consecutive digit timeslots in which the position of each digit slot can be identified by reference to a frame
alignment. The frame alignment signal does not necessarily occur, in whole or in part, in each frame.
Full Duplex — A mode of operation permitting simultaneous transmission of information between two locations in both
directions.
Gain — The change in signal amplitude (increase or decrease) after passing through an amplifier, or other circuit stage. Usually
expressed in dB, an increase is a positive number, and a decrease is a negative number.
Gain Tracking Error — The variation of gain from a constant level (determined at 0 dBm input level) when measuring the
dependence of gain on signal level by comparing the output signal to the input signal over a range of input signals.
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MC145572
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