Multitech MTPSR1-202ST Guía de usuario descargar pdf (Pagina 94)

ProxyServer User Guide

MTPSR1-202ST

ROM, PROM, EPROM and EEPROM technologies. Firmware becomes “hard software” when holding

program code.

Foreground: The application program currently running on and in control of the PC screen and

keyboard. The area of the screen that occupies the active window. Compare with “background”.

Fractional T1 (FT1): A digital data transmission rate between 56 Kbps (DS0 rate) and 1.544M bps

(the full T1 rate - in North America). FT1 is typically provided on 4-wire (two copper pairs) UTP. Often

used for video conferencing, imaging and LAN interconnection due to its low cost and relatively high

speed. FT1 rates are offered in 64 Kbps multiples, usually up to 768 Kbps.

Frequency: A characteristic of an electrical or electronic signal which describes the periodic recur-

rence of cycles. Frequency is inversely proportional to the wavelength or pulse width of the signal

(i.e., long wavelength signals have low frequencies and short wavelength signals yield high frequen-

cies).

Foreign Exchange (FX): A CO trunk with access to a distant CO, allowing ease of access and flat-

rate calls anywhere in the foreign exchange area.

Foreign Exchange Office (FXO): provides local telephone service from a CO outside of (“foreign”

to) the subscriber’s exchange area. In simple form, a user can pick up the phone in one city and

receive a tone in the foreign city. Connecting a POTS telephone to a computer telephony system via

a T1 link requires a channel bank configured for the FX connection. To generate a call from the POTS

set to the computer telephony system, a FXO connection must be configured.

Foreign Exchange Station (FXS): See FX, FXO. To generate a call from the computer telephony

system to the POTS set, a FXS connection must be configured.

Forward Explicit Congestion Notification (FECN): A bit that tells you that a certain frame on a

particular logical connection has encountered heavy traffic. The bit provides notification that conges-

tion-avoidance procedures should be initiated in the same direction of the received frame. See also

BECN (Backward Explicit Congestion Notification).

Frame: A group of data bits in a specific format to help network equipment recognize what the bits

mean and how to process them. The bits are sent serially, with a flag at each end signifying the start

and end of the frame.

Frame Relay: A form of packet switching that uses small packets and that requires less error check-

ing than other forms of packet switching. Frame relay is effective for sending “bursty” data at high

speeds (56/64K, 256K, and 1024 Kbps) over wide area networks. Frame Relay specifications are

defined by ANSI documents ANSI T1.602, T1.606, T1S1/90-175, T1S1/90-213, and T1S1/90-214. In

using frame relay, blocks of information (frames) are passed across a digital network interface using

a “connection number” that is applied to each frame to distinguish between individual frames.

Frame Relay Forum: A nonprofit organization of 300+ vendors and service providers, based in

Foster City, CA, that are developing and deploying frame relay equipment.

Frame Relay Implementor’s Forum: A group of companies supporting a common specification for

frame relay connection to link customer premises equipment to telco network equipment. Their

specification supports ANSI frame relay specs and defines extensions such as local management.

Frame Relay Access Device (FRAD): A piece of equipment that acts as a concentrator or frame

assembler/dissassember that can support multiple protocols and provide basic “routing” functions.

Gateway: 1. Afunctional unit that interconnects two computer networks with different network archi-

tectures. A gateway connects networks or systems of different architectures. A bridge interconnects

networks or systems with the same or similar architectures. 2. A network that connects hosts.

Graphical User Interface (GUI): A type of computer interface consisting of a visual metaphor of a

real-world scene, often of a desktop. Within that scene are icons, representing actual objects, that the

user can access and manipulate with a pointing device.

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