ATL Telecom AM200 - Manual (Page 140)

ATL User Guide
AM200 Modem 140
Digital Loopback A technique for testing the digital processing circuitry of a communications device
that can be initiated locally or remotely via a telecommunications circuit.
DSL Digital Subscriber Line
DSX-1 The NTU interface in the UK to which an E1 line is attached.
DTE (Data Terminal Equipment.) Device acting as data source. Compare with DCE
DTR (Data Terminal Ready) An interface signal between a DTE and a DCE to confirm that
the DTE is ready to send and receive signals.
Dynamic routes These are routes that are learned via a routing protocol such as RIP. They are
maintained automatically. Commands that make changes to dynamic routes are
usually effective only temporarily because the same route will be learned again from
the other routers in the network.
E1 The European standard for high-speed digital transmission at 2.048Mbps, with 31
64Kbits channels available to traffic.
E3 A European digital transmission method with speeds of 34.368Mbps.
ELAN (Emulated Local Area Network) In ATM applications, a client-server model can be
used to simulate an Ethernet or Token Ring LAN and function as a logical network.
You can have several ELANs on one ATM network.
EMC (Electro Magnetic Compatibility) A set of standards aimed at limiting electromagnetic
emissions from equipment and providing an adequate level of immunity from
interference.
EMI (Electro Magnetic Interference) Electromagnetic radiation leakage outside a
transmission medium. It varies with frequency and power. In severe circumstances it
can effect other equipment, transmission media and even humans. International
regulatory organizations set limits for the levels of emissions.
Error Correction Techniques used to correct errors, which arise during the transmission of data. Error
correction is based on algorithms which include extra information with the data to
enable the error to be located and corrected, or just a simple request for re-
transmission.
Ethernet A type of LAN invented by the Xerox Corporation at the Palo Alto Research Centre.
Ethernet 802.2 Ethernet 802.3 Ethernet II Ethernet SNAP. These are different formats
used to encapsulate the data.
Ethernet II An Ethernet frame format defined by the IEEE. Ethernet II frames are usually
associated with the TCP/IP protocol.
Ethernet Address A unique 48bit number maintained by the IEEE/ISO and assigned to each Ethernet
network adaptor
ETSI European Telecommunications Standardisation