Netopia 2200 User Manual

Page 312

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ADSL. Asymmetric Digital Subscriber Line. Modems attached to twisted pair
copper wiring that transmit 1.5-9 Mbps downstream (to the subscriber) and
16 -640 kbps upstream, depending on line distance. (Downstream rates are
usually lower that 1.5Mbps in practice.)

AH. The Authentication Header provides data origin authentication, connec-
tionless integrity, and anti-replay protection ser vices. It protects all data in a
datagram from tampering, including the fields in the header that do not
change in transit. Does not provide confidentiality.

ANSI. American National Standards Institute.

ASCII. American Standard Code for Information Interchange (pronounced
ASK-ee). Code in which numbers from 0 to 255 represent individual charac-
ters, such as letters, numbers, and punctuation marks; used in text repre-
sentation and communication protocols.

asynchronous communication. Network system that allows data to be
sent at irregular inter vals by preceding each octet with a star t bit and follow-
ing it with a stop bit. Compare synchronous communication.

Auth Protocol. Authentication Protocol for IP packet header. The three
parameter values are None, Encapsulating Security Payload (ESP) and
Authentication Header (AH).

-----B-----

backbone. The segment of the network used as the primary path for trans-
por ting traffic between network segments.

baud rate. Unit of signaling speed equal to the number of number of times
per second a signal in a communications channel varies between states.
Baud is synonymous with bits per second (bps) if each signal represents
one bit.

binary. Numbering system that uses only zeros and ones.

bps. Bits per second. A measure of data transmission speed.

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