IBM totalstorage 326 User Reference page 226

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, 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.
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.
optical cable. A fiber, multiple fibers, or a fiber bundle in a structure built to meet optical, mechanical, and
environmental specifications (E).
optical fiber. Any filament made of dielectric materials that guides light, regardless of its ability to send signals.
214
Model 326 User's Reference