| Term | Definition |
|
OAM
|
Operation Administration and Maintenance Management framework
defined by the ITU. OAM cells are special purpose ATM cells
exchanged between two ATM entities for network fault and performance
management, analysis and fault isolation.
|
|
OC
|
Optical Carrier - A range of standards applying to optical
communications.
|
|
OC-1
|
The optical interface designed to work with the STS-1 signaling rate
in a synchronous optical network.
|
|
OC-3
|
Optical Carrier level-3 - A SONET channel that carries a bandwidth
of 155.55 Mbps.
|
|
O-CDMA
|
Optical code division multiple access.
|
|
OC-n
|
The optical interface designed to work with the STS-n signaling rate
in a synchronous optical network (SONET). n is a whole number
integer between 1 and (currently) 48.
|
|
Octet
|
A set of eight bits.
|
|
OCXO
|
Oven Controlled Crystal Oscillator.
|
|
Odd Parity
|
An error checking process whereby the transmitted characters have
been forced, by the transmitter, to always have an odd numeric value.
|
|
OEM
|
Original Equipment Manufacturer.
|
|
OFDM
|
Orthogonal Frequency Division Modulation.
|
|
Off-hook
|
The state which defines that a telephone circuit is available for
use.
|
|
Office Class
|
The definition of a telephony switching/routing facility within the
transmission hierarchy.
|
|
Off-load
|
The process whereby network overheads are removed from a specific
node.
|
|
Ohm
|
The electrical unit of resistance. The value of resistance through
which a potential of one volt will maintain a current of one ampere.
|
|
On Hook
|
The normal, inactive, condition of a telephone system terminal
device.
|
|
One Way Trunk
|
A line between a PBX and a Central Office or between Central Offices
where communication proceeds in one direction only.
|
|
OP AMP
|
Operational Amplifier.
|
|
OPC
|
Organic Photo Conductor.
|
|
Open Air Transmission
|
The type of transmission which does not require a "closed" (wire,
fiber, etc.) transmission. May also be referred to as non-contained
transmission.
|
|
Optical Cavity
|
A region bounded by two or more mirrors or other reflecting surfaces
which are aligned so to provide multiple reflections. An example of
an optical cavity would include the resonator in a laser.
|
|
Optical Channel Spacing
|
The wavelength separation between adjacent WDM channels.
|
|
Optical Fiber
|
Any glass or plastic fiber that is manufacture for the transmission
of light signals.
|
|
Optical Fiber Amplifier
|
A device that amplifies an optical signal directly, without the need
to convert it to an electrical signal, amplify it electrically, and
reconvert is to an optical signal.
|
|
Optical Polarization
|
The term used to describe the orientation in space of time varying
field vector of an optical signal.
|
|
Optical Time Domain Reflectometry
|
A method for evaluating optical fiber based on detecting and
measuring backscattered (reflected) light. Used to measure fiber
length and attenuation, evaluate splice and connector joints, locate
faults, and certify cabling systems.
|
|
Optical Transmitter
|
This is an optoelectronic circuit that converts an electronic signal
into an optical signal, the later bearing the same intelligence as
the earlier.
|
|
OSCAR
|
Orbiting Satellite Carrying Amateur Radio.
|
|
Outgoing Access
|
A CCITT description of the ability of a device in one network to
communicate with a device in another network.
|
|
Out-of-Band Signaling
|
A method of signaling that uses the same path as voice-frequency
transmission, but in which the signaling band is outside the band
used for voice frequencies.
|
|
Overscan
|
When an image is displayed, it is "overscanned" if a small portion
of the image extends beyond the edges of the screen. Overscan is
common in TVs that use CRTs to allow for aging and variations in
components, temperature and power supply.
|
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