ADTRAN MX2800 M13 Manual de usuario descargar pdf (Pagina 182)

MX2800M13 Multiplexer User Manual

E-2 61200290L1-1H

bit rate The speed at which bits are transmitted, usually expressed in bits

per second (bps).

bps Bits per second. The number of bits passing a specific point per

second. Examples of common rates are kbps (one thousand bits

per second) and Mbps (one million bits per second). T3 operates at

44.736 Mbps.

BPV Bipolar violation. A violation in the alternate mark inversion (AMI)

line code in which consecutive 1s are represented by pulses of

opposite polarity. BPVs that are not intentional (B8ZS) are counted

as errors. Could also be the presence of two consecutive 1 bits of

the same polarity on the T-carrier line.

bridge A data communications device that connects two or more networks

and forwards packets between them.

byte Generally, an 8-bit quantity of information. This term is used

mainly in referring to parallel data transfer, semiconductor capac-

ity, and data storage.

carrier The provider of the telecommunication services to the customer

site. Carriers can be local telephone companies, regional telephone

companies, or any inter-exchange carrier such as AT&T, Sprint, or

MCI.

C-bit An overhead bit in the DS3 string not used for framing, parity, or

alarm indication.

CCITT Consultive Committee for International Telephony and Telegraphy.

A standards organization that devises and proposes recommenda-

tions for international communications. See also ANSI.

CD Carrier detect. A signal generated by a modem or DSU/CSU

indicating the presence of a carrier signal on a communications

link.

channel A transmission path between two or more termination points, also

called a circuit, facility, line, link, or path.

channel bank Equipment in a telephone central office or customer premises that

performs multiplexing of lower-speed digital channels into a

higher-speed composite channel. The channel bank also detects

and transmits signaling information for each channel, thereby

transmitting framing information so that time slots allocated to

each channel can be identified by the receiver.

channel service unit See “CSU”.

clocking An oscillator-generated signal that provides a timing reference for a

transmission link. A clock provides signals used in a transmission

system to control the timing of certain functions. The clock has two

functions: (1) to generate periodic signals for synchronization, and

(2) to provide a time base.

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