IBM 201 - Manual (Page 130)

modulation. (1) The process by which a characteristic of a carrier is varied in accordance with a characteristic of an
information-bearing signal (T). (2) The process by which a message signal is impressed upon a carrier signal so that
the carrier is altered to represent the message signal.
multicast address (see LAN multicast).
multimode optical fiber. (1) A graded-index or step-index optical fiber that allows more than one bound mode to
propagate (E). Contrast with single-mode optical fiber. (2) In FDDI, an optical fiber waveguide usually characterized by
a core diameter of 50 to 100 micron that will allow a large number of modes to propagate.
multiplexing. In data transmission, a function that permits two or more data sources to share a common
transmission medium so that each data source has its own channel (A) (I).
N
N (see Newton).
nanosecond (ns). One thousand millionth of a second.
NAS. Network-attached storage.
NDMP (see network data management protocol).
network-attached storage (NAS). A task-optimized storage device directly attached to a network that works
independent of the general-purpose file servers.
network data management protocol (NDMP). An open standard protocol for enterprise-wide network-based backup
for network attached storage.
network file system (NFS). A protocol, developed by Sun Microsystems, Incorporated, that allows any host in a
network to mount another host’s file directories. After a file directory is mounted, the it appears to reside on the local
host.
network information services (NIS). A set of UNIX network services (for example, a distributed service for retrieving
information about the users, groups, network addresses, and gateways in a network) that resolve naming and
addressing differences among computers in a network.
network interface.
newton (N). The force that when applied to a body having a mass of one kilogram gives it an acceleration of one
meter per second per second (1 m/s(2)).
NFS (see network file system).
NI (see network interface).
NIS (see network information services).
non-broadcast frame. A frame containing a specific destination address and that can contain routing information
specifying which bridges are to forward it. A bridge will forward a non-broadcast frame only if that bridge is included in
the frame’s routing information.
non-canonical. In this form, the most significant bit of an octet is transmitted first.
ns (see nanosecond).
O
ODI (see Open Data-Link Interface).
Open Data-Link Interface (ODI). A common interface for network drivers developed by Novell. It allows multiple
transport protocols to run on one network adapter.
118 NAS 200 User’s Reference