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Glossary:
Installation and Upgrades for G700 with S8300 or S8700
555-234-100 — Issue 3 — May 2003
353
numbering plan area (NPA)
In North America, a system of area codes that follows a specified numbering sequence that is based on geography. In
other regions, the equivalent of a city code or a routing code, for which other numbering sequences might be used. The
purpose of the numbering sequences is to ensure that no two telephones in the same geographical area have the same 7-
digit telephone number. See also
North American numbering plan (NANP).
NXX
See
public network office code (NXX).
O
OA
See
operator assisted (OA).
OC-3
See Optical Carrier level-3 (OC3)
.
occurrence
See
appearance.
OCM
Outbound call management
Octaplane
Term for the capability and the related hardware that uses a proprietary 8-GB bus to bundle stackable components into a
larger logical switch. The logical switch is then presented as a single network element to system management. An
Octaplane is wired in a ring configuration, and provides redundancy and rerouting if one of the components must be
replaced or added in a hot system.
offered load
The traffic that would be generated by all the requests for service that occur within a monitored interval. The monitored
interval is usually 1 hour.
off-premises extension (OPX)
A telephone that is located in a different building from the main telephone system, but is connected to the main telephone
system with a dedicated line. The remote telephone can use all the facilities of the main telephone system.
ONS
On-premises station
Open Systems Interconnect (OSI)
A system of seven independent communication protocols that was defined by the International Standards Organization
(ISO). Each of the seven layers enhances the communications services of the layer below, and shields the layer above
from the implementation details of the lower layer. In theory, this structure can be used to build communication systems
from independently developed layers.
operator assisted (OA)
A type of telephone call that a user makes with the assistance of an operator.
OPS
Off-premises station