Synonym bound mode.

In an optical fiber, a ray that is confined primarily to the core.
Note: A guided ray satisfies the relation given by ,f21 where r is the angle the ray makes with the fiber axis, r is the radial position, i.e., radial distance, of the ray from the fiber axis, nr is the refractive index at the radial distance r… (Read More →)

A wave having (a) energy concentrated near a boundary, or between substantially parallel boundaries, separating materials of different properties and (b) a direction of propagation effectively parallel to these boundaries.

Generic User Profile

A smooth change in the direction of the axis of a waveguide, throughout which the axis remains in a plane parallel to the direction of magnetic H-field (transverse) polarization. Synonym H-plane bend.

In Integrated Services Digital Networks (ISDN), a 384-kb/s, 1472-kb/s, or 1536-kb/s channel, designated as "H0", "H10", and "H11", respectively, accompanied by timing signals used to carry a wide variety of user information.
Note: Examples of types of user information representation forms include fast facsimile, video, high-speed data, high-quality audio, packet-switched data, bit streams at rates less than the respective H-channel… (Read More →)

Synonym H-bend.

Hierarchical Virtual Private LAN Service

High Availability

A noise weighting used in a noise measuring set to measure noise across the HA1-receiver of a 302-type or similar instrument.
Note 1: The meter scale readings of an HA1 test set are in dBa (HA1).
Note 2: HA1 noise weighting is obsolete for new DOD applications.