1. In spectroscopy, an optical source that emits one or more spectrally narrow lines as opposed to a continuous spectrum.
2. In the geometric sense, an optical source having an emitting area in the form of a spatially narrow line, e.g., a slit. Synonym slit source.

In optics, an emission or absorption spectrum consisting of one or more narrow spectral lines, as opposed to a continuous spectrum.

See modulation rate.

Network elements that originate and/or terminate line signals. LTEs can originate, access, modify, or terminate the transport overhead, or can perform any combination of these actions. [T1.105-1988]

In a DDN switching center, the processor that controls traffic on a line.

The customer side of any digital subscriber line (DSL) that does not terminate on the customer installation (CI). [T1.216-1998]

See busy verification.

Of an electromagnetic wave, propagation in which the direct ray from the transmitter to the receiver is unobstructed, i.e., the transmission path is not established by or dependent upon reflection or diffraction.
Note: The need for LOS propagation is most critical at VHF and higher frequencies.

A translation of standardized, existing video systems (using 525, 625, and 1125 total lines per frame) to proposed systems.
Note: Current systems operate in a 2:1 interlace mode, i.e., with
26
2. 5,
31
2. 5,
56
2. 5 lines per field and with concurrent temporal differences at field rates of
5
0. 00,
5
9. 94, or
6
0.… (Read More →)

A map or overlay for signal communications operations that shows the actual routes and types of construction of wire circuits in the field. It also gives the locations of switchboards and telegraph stations. [JP1]