Specifications

Ethernet OAM
Ethernet operation, administration and maintenance (OAM) are a
set of standardized protocols for measuring and controlling
network performance. There are two layers of Ethernet OAM:
Service OAM (provides end-to-end connectivity fault management
per customer service instance, even in multi-operator networks)
and Link or Segment OAM (detailed monitoring and
troubleshooting of an individual physical or emulated link).
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.
Gateway
Gateways are points of entrance and exit from a communications
network. Viewed as a physical entity, a gateway is that node that
translates between two otherwise incompatible networks or
network segments. Gateways perform code and protocol
conversion to facilitate traffic between data highways of differing
architecture.
Half Duplex
A circuit or device capable of transmitting in two directions, but
not at the same time.
Interface
A shared boundary, defined by common physical interconnection
characteristics, signal characteristics, and meanings of exchanged
signals.
IP Address
Also known as an Internet address. A unique string of numbers
that identifies a computer or device on a TCP/IP network. The
format of an IP address is a 32-bit numeric address written as four
numbers from 0 to 255, separated by periods (for example,
1.0.255.123).