Mechanisms that mask differences in physical, link, and network technologies by converting (or mapping) states and protocols into consistent network and user services. [After T
1. Rpt34-1994]

Within the boundaries of a local access and transport area (LATA).

An intra-service provider block port allows an SP to port a thousands-block of numbers from one switch to another serving the same rate center using a port type of “pool” in the NPAC. This can be used in an area where pooling has or has not been established. An ISP block port may be denoted in BIRRDS with a thousands-block… (Read More →)

An intra-service provider port allows an SP to retain unavailable TNs in contaminated thousands-blocks that are being donated to an industry inventory pool.  Specifically, numbers assigned to customers from donated thousands-blocks that are contaminated will be ported back to the donating carrier to enable it to continue to provide service to those customers.  An intra-service provider port can also be… (Read More →)

In an optical fiber, distortion caused by dispersion, such as material or profile dispersion, of a given propagating mode. [After 2196]

Any private network that uses some or all of the protocols of The Internet.
Note: In an intranet, nodes interact in a client-server relationship, nodes are identified by using Internet protocol (IP) addresses, and files are identified by universal resource locators (URLs). The data being exchanged are typically formatted using the HTML language, and is controlled and displayed using a… (Read More →)

A single direct transmission channel, e.g., voice-frequency circuit, within a given switching center.

Of nonidentical optical fibers joined by a splice or a mated pair of connectors, the power loss attributable to manufacturing variations, in such parameters as physical dimensions, differences in refractive index (including profile parameter), numerical aperture, and mode field diameter.

In a transmission path or device, that noise inherent to the path or device and not contingent upon modulation.

Measurements that require that the facility be taken out of service and made unavailable to the user. [T
1. Rpt25-1993]