Motorola 2200 ユーザーズマニュアル

10Base-T. IEEE 802.3 specification for Ethernet that uses unshielded twisted pair (UTP) wiring with RJ-45 
eight-conductor plugs at each end. Runs at 10 Mbps.

100Base-T. IEEE 802.3 specification for Ethernet that uses unshielded twisted pair (UTP) wiring with RJ-45 
eight-conductor plugs at each end. Runs at 100 Mbps.

ACK. Acknowledgment. Message sent from one network device to another to indicate that some event has 
occurred. See NAK.

access rate. Transmission speed, in bits per second, of the circuit between the end user and the network.

adapter. Board installed in a computer system to provide network communication capability to and from 
that computer system.

address mask. See subnet mask.

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, connectionless 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 characters, such as letters, numbers, and punctuation marks; used in 
text representation and communication protocols.