MC145572PB Freescale Semiconductor, MC145572PB Datasheet - Page 241

• 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.
I
GLOSSARY OF TERMS AND ABBREVIATIONS
The list contains terms found in this and other Motorola publications concerned with Motorola Semiconductor Prod-
ucts for Communications.
A–Law — A European companding/encoding law commonly used in PCM systems.
A/B Signaling — A special case of 8th–bit (LSB) signaling in a –law system that allows four logic states to be multiplexed with
voice on PCM channels.
A/D (analog–to–digital) converter (ADC) — A converter that uniquely represents all analog input values within a specified total
input range by a limited number of digital output codes, each of them exclusively representing a fractional part of the total analog
input range.
Aliasing Noise — A distortion component that is created when frequencies present in a sampled signal are greater than one–
half the sample rate.
Answer Back — A signal sent by receiving data–processing device in response to a request from a transmitting device, indicat-
ing that the receiver is ready to accept or has received data.
Anti–Aliasing Filter — A filter (normally low pass) that band limits an input signal before sampling to prevent aliasing noise.
Asynchronous — A mode of data transmission in which the time occurrence of the bits within each character or block of char-
acters relates to a fixed time frame, but the start of each character or block of characters is not related to this fixed time frame.
Attenuation — A decrease in magnitude of a communication signal.
Bandwidth — The information–carrying frequencies between the limiting frequencies of a communication line or channel.
Baseband — The frequency band occupied by information–bearing signals before combining with a carrier in the modulation
process.
Baud — A unit of signaling speed equal to the number of discrete signal conditions or events per second. This refers to the
physical symbols/second used within a transmission channel.
Bit Rate — The speed at which data bits are transmitted over a communication path, usually expressed in bits per second. A
9600 bps terminal is a 2400 baud system with 4 bits/baud.
Blocking — A condition in a switching system in which no paths or circuits are available to establish a connection to the called
party even though it is not busy, resulting in a busy tone to the calling party.
BORS(C)HT — Battery, Overvoltage, Ringing, Supervision, (Codec), Hybrid, Test; the functions performed by a subscriber line
card in a telephone exchange.
Broadband — A transmission facility whose bandwidth is greater than that available on voice–grade facilities. (Also called wide
band.)
C Message — A frequency weighting that evaluates the effects of noise based on its annoyance to the “typical” subscriber of
standard telephone service or the effects of noise (background and impulse) on voice–grade data service.
Carrier — An analog signal of fixed amplitude and frequency that combines with an information–bearing signal by modulation to
produce an output signal suitable for transmission.
CCITT — Consultative Committee for International Telephone and Telegraph; an international standards group of European
International Telecommunications Union.
CCSN — Common Channel Signaling Network.
Central Office (CO) — A main telephone office, usually within a few miles of a subscriber, that houses switching gear; common-
ly capable of handling about 10,000 subscribers.
Channel Bank — Communication equipment commonly used for multiplexing voice–grade channels into a digital transmission
signal (typically 24 channels in the U.S. and 30 channels in Europe).
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MC145572
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