ATL Telecom AM200 - Manual (Page 139)

ATL User Guide
AM200 Modem
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BERT Bit Error Rate Tester
Bridge A device that connects and passes packets between two network segments that use
the same communications protocol. A bridge operates at the Data Link layer of the
OSI reference model. In general, a bridge will filter, forward, or flood an incoming
frame based on its MAC address.
Broadband Generally refers to a transmission bandwidth capable of carrying more than a single
voice-grade channel (4kHz). Multiple channels of data can be transmitted over a
single communications medium by multiplexing the signals.
CCITT Consultative Committee for International Telegraph and Telephony. Replaced by the
ITU-T Standardisation Sector.
CD Carrier Detect A signal that indicates when a carrier frequency has been sensed on
the line. It shows that a connection has been made. Also called RLSD (Received Line
Signal Detector) and DCD (Data Carrier Detect)
CE A certification that products must attain in order to be sold in the European Union,
which involves complying with a number of different EU standards including low
EMI/RFI emissions, strong resistance to EMI/RFI, and electrical safety.
CHAP Challenge Handshake Authentication Protocol
CO (Central Office) Term for a telephone exchange where circuits are terminated and
traffic is switched.
CPE (Customer Premises Equipment) Telecommunications terminating equipment such as
telephones, modems or terminals installed at the customers premises for the
connection to telephone or data networks.
CRC (Cyclic Redundancy Check) A data transmission error detection system where the
data is read, a CRC character is calculated and appended to the data. On receipt of
the data the calculation is repeated and compared with the original CRC character.
CSMA/CD (Carrier Sense Multiple Access/Collision Detection) A data link layer networking
technology providing access and managing collisions of data in Ethernet. Devices
connected to the LAN listen and only transmit when the line is free. If a collision
occurs the packet is re-transmitted after a random timeout.
Datagram A quantity of data that is sent, received, and routed as a unit.
Data Packet One frame that contains information in a packet-switched system.
DCE (Data Communications Equipment.) A Device that provides the functions required
establishing, maintaining and terminating a data transmission connection.
DHCP (Dynamic Host Configuration Protocol) A protocol used to dynamically assign IP
addresses to clients. Its purpose is to overcome the shortage of IP addresses in Ipv4,
by sharing a set of addresses on a timeshare basis.