MC145572PB Freescale Semiconductor, MC145572PB Datasheet - Page 244

• 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.
HDLC — High–Level Data Link Control; a CCITT standard data communication line protocol.
Half Duplex — A transmission system that permits communication in one direction at a time. CB ratios, with “push–to–talk”
switches, and voice–activated speakerphones, are half duplex.
Handset — A rigid assembly providing both telephone transmitter and receiver in a form convenient for holding simultaneously
to mouth and ear.
Hookswitch — A switch that connects the telephone circuit to the subscriber loop. The name derives from old telephones where
the switch was activated by lifting the receiver off and onto a hook on the side of the phone.
Idle Channel Noise (ICN) — The total signal energy measured at the output of a device or channel under test when the input of
the device or channel is grounded (often a wide–band noise measurement using a C–message weighting filter to band–limit the
output noise).
Intermodulation — The modulation of the components of a complex wave by each other (in a nonlinear system).
Intermodulation Distortion — An analog line impairment when two frequencies interact to create an erroneous frequency, in
turn distorting the data signal representation.
IRED — Infrared. Used as a wireless link for remote control or to transfer data.
ISDN — Integrated Services Digital Network; a communication network intended to carry digitized voice and data multiplexed
onto the public network.
Jitter — A type of analog communication line distortion caused by abrupt, spurious signal variation from a reference timing
position, and capable of causing data transmission errors, particularly at high speeds. (The variation can be in amplitude, time,
frequency, or phase.)
Key System — A miniature PABX that accepts 4 to 10 lines and can direct them to as many as 30 telsets.
Mu–Law —
–law) A companding law accepted as the North American standard for PCM based systems.
LAN — Local Area Network; a data–only communication network between data terminals using a standard interface to the
network.
Line — The portion of a circuit external to an apparatus that consists of the conductors connecting the apparatus to the
exchange or connecting two exchanges.
Line Length Compensation — Also referred to as loop length compensation, it involves changing the gain of the transmit and
receive paths, within a telephone, to compensate for different signal levels at the end of different line lengths. A short line (close
to the CO) will attenuate signals less, and therefore less gain is needed. Compensation circuits generally use the loop current as
an indication of the line length.
Longitudinal Balance — The common–mode rejection of a telephone circuit.
Loop — The loop formed by the two subscriber wires (Tip and Ring) connected to the telephone at one end, and the central
office (or PBX) at the other end. Generally it is a floating system, not referred to ground, or ac power.
Loopback — Directing signals back toward the source at some point along a communication path.
Loop Current — The dc current that flows through the subscriber loop. It is typically provided by the central office or PBX, and
ranges from 20 to 120 mA.
LT — Line Termination (Line Card).
MCU — MicroComputer Unit (also MicroController Unit).
MPU — MicroProcessor Unit.
Mu–Law — A companding/encoding law commonly used in U.S. (same as –law).
MUX — Multiplex or multiplexer.
Modem — MOdulator–DEModulator; a unit that modulates and demodulates digital information from a terminal or computer port
to an analog carrier signal for passage over an analog line.
Multiplex — To simultaneously transmit two or more messages on a single channel.
NT1 — Network Termination 1 (OSI Layer 1 Only).
NT2 — Network Termination 2 (OSI Layers 2 and 3).
Off–Hook — The condition when the telephone is connected to the phone system, permitting loop current to flow. The central
office detects the dc current as an indication that the phone is busy.
For More Information On This Product,
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MC145572
MOTOROLA
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