Octet. Eight (8) bits. Another
term for a byte.
However, a byte is not defined in all digital systems as 8
bits so the term
'octet' is used.
OFDM (Orthogonal Frequency Division Multiplexing).
A technique that splits a wide frequency band into a number of narrow bands and inverse
multiplexes data across sub-channels.
Offered traffic. The number
of dialing attempts made to a subscriber within a specified
time period.
Off-hook. A signal indicating
that the telephone of the called party is engaged.
Off-line. A state used to identify
that a device is not in operation.
OHG: Operators Harmonization Group.
OHG is an industry body established to develop a single 3G
cellular mobile standard.
ONAL (Off-network access line).
A line connecting a telecommunications company network to
the public network.
Off-network calling.
Calling the public telephone system from within a private
network.
OIW. A workshop for implementors
of OSI. The North American regional forum at which OSI implementation
agreements are decided.
OMUX (Output Multiplexer). A multiplexer at the output of a satellite transponder
On-hook. The status of telephone
equipment that is ready to receive a call.
On-hook dialing. A method
of dialing a telephone without the need to lift the receiver.
The caller dials the number and uses the telephone speaker
to listen to the status of the call. When the call is connected,
the caller lifts the receiver and speaks.
On-network call. A call
made within a private network.
One-way split. A facility
that allows a telephone operator within a private exchange
to speak to an extension without the caller hearing the conversation.
Online. The status of a device
that is connected to another device and prepared to transmit
or receive signals.
Online processing. The
use of a computer/automated operator to operate equipment.
Open architecture. A
network structure in which all hardware and software is based
on industry standards in order to facilitate compatibility
with as many other networks as possible.
Orbital period. The time
that it takes a satellipe to complete one circumnavigation
of its orbit.
Orbital Slot. The location of a satellite in orbit around the globe.
Origin Server. A server
on which a given resource is located or created. It is often
referred to as a web or HTTP
server.
OSI (Open System Interconnection).
A standard for a layered
architecture that allows data to be transferred among
systems through networks. See layer.
OSS (Operation and Support System).
An application program that allows a network operator to monitor,
analyze and control the telecommunications network.