Specifications

E1 Line
A 2.048 Mbps line, common in Europe, that supports thirty-two 64
kbps channels, each of which can transmit and receive data or
digitized voice. The line uses framing and signaling to achieve
synchronous and reliable transmission. The most common
configurations for E1 lines are E1 PRI, and unchannelized E1.
E3
The European standard for high speed digital transmission,
operating at 34 Mbps.
Encapsulation
Encapsulating data is a technique used by layered protocols in
which a low level protocol accepts a message from a higher level
protocol, then places it in the data portion of the lower-level
frame. The logistics of encapsulation require that packets traveling
over a physical network contain a sequence of headers.
Equalizer
A device that compensates for distortion due to signal attenuation
and propagation time with respect to frequency. It reduces the
effects of amplitude, frequency and/or phase distortion.
Ethernet
A local area network (LAN) technology which has extended into
the wide area networks. Ethernet operates at many speeds,
including data rates of 10 Mbps (Ethernet), 100 Mbps (Fast
Ethernet), 1,000 Mbps (Gigabit Ethernet), 10 Gbps, 40 Gbps, and
100 Gbps.
Flow Control
A congestion control mechanism that results in an ATM system
implementing flow control.
Frame
A logical grouping of information sent as a link-layer unit over a
transmission medium. The terms packet, datagram, segment, and
message are also used to describe logical information groupings.
Framing
At the physical and data link layers of the OSI model, bits are fit
into units called frames. Frames contain source and destination
information, flags to designate the start and end of the frame,
plus information about the integrity of the frame. All other
information, such as network protocols and the actual payload of
data, is encapsulated in a packet, which is encapsulated in the
frame.
Full Duplex
A circuit or device permitting transmission in two directions
(sending and receiving) at the same time.
FXO (Foreign Exchange
Office)
A voice interface, emulating a PBX extension, as it appears to the
CO (Central Office) for connecting a PBX extension to a
multiplexer.
FXS (Foreign Exchange
Subscriber)
A voice interface, emulating the extension interface of a PBX (or
subscriber interface of a CO) for connecting a regular telephone
set to a multiplexer.
G.703
An ITU standard for the physical and electrical characteristics of
various digital interfaces, including those at 64 kbps and 2.048
Mbps.