nately, during each bit cell. The sending device must maintain ones density
in AMI but not independently of the data stream. Also known as binary-
coded, alternate mark inversion. Contrast with: B8ZS. See also: ones density.
through the air, the transmission conveys information through a variation of
some type of signal amplitude, frequency, and phase.
used to define values. Traditional phone service is an analog connection.
related activities, approves U.S. national standards, and develops U.S. posi-
tions in international standards organizations. ANSI assists in the creation of
international and U.S. standards in disciplines such as communications, net-
working, and a variety of technical fields. It publishes over 13,000 standards
for engineered products and technologies ranging from screw threads to net-
working protocols. ANSI is a member of the IEC and ISO.
earlier Phase 1 protocols support one physical network with only one net-
work number that resides in one zone. The later Phase 2 protocols support
more than one logical network on a single physical network, allowing net-
works to exist in more than one zone. See also: zone.