Idiopathic intracranial hypertension. the term used for intracranial hypertension (IH) for which no cause can be found

Idiopathic Intracranial Hypertension. condition where ICP is elevated for unknown reasons; see other side bar

IS-IS Hello. Message sent by all IS-IS systems to maintain adjacencies. See also IS-IS.

Intermediate to Intermediate Hello. An OSI hello message distributed between ISs. This allows an IS to determine the existence of other ISs to establish adjacencies.

Instituto de Investigaciones en Humanidades

TTL input current when the input logic level is HIGH.