User's Manual

Part # 34357-MNL Rev.03 SPEEDLAN 9200 User Guide
Glossary-6
Digital Signal Processor (DSP)
A specialized computer chip designed to perform speedy and complex operations on digitized waveforms.
E1
An E1 is a full-duplex synchronous digital stream with a signaling rate of 2.048 Mb/s.
The electrical characteristics of the digital interface are defined in the recommendation
UIT-T G.703 (which by the way also defines it for a T1). Framing structure is defined in
ITU recommendations G.704 and G.732. Finally, the only countries in the world where E1
streams are not regularly used are in U A and Japan.
Elevation
1. Height above sea level. 2. The vertical angle in degrees between the ground and the direction the antenna
is pointed.
Encryption
The method of converting data into a form that cannot be understood by unauthorized people. Encryption is
very important when using wireless communication because wireless circuits are easier to tap into than
wired circuits. There is also strong encryption, which means ciphers are used to make uncoding the signal
almost impossible, unless you have the decryption keys.
ESD
Electro-Static Discharge happens when there is a transfer between objects at diverse voltages.
Ethernet
This is the most popular physical layer LAN technology in use today. Other LAN types include Token Ring,
Fast Ethernet, Fiber Distributed Data Interface (FDDI), Asynchronous Transfer Mode (ATM) and Local Talk.
Ethernet is popular because it strikes a good balance between speed, cost and ease of installation.
Ethernet Switch
This device helps expand the Ethernet network. LAN switches can link four, six, ten or more networks together,
and have two basic architectures. This switch “cuts through” and “stores and forwards” as well. This
technique takes more time to examine the entire packet, but it allows the switch to catch certain packet errors
and keep them from propagating through the network. A switch also operates between the DataLink and
Network Layer of the OSI model. It reads the MAC address and will either bridge it to the Physical Layer or
route to the Network Layer.