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VR-N100U USERS MANUAL
Page 90 of 98 All Items Are Subject To Change Without Notice Feb. 2004 Rev 1.0
network.org & a nonprofit organization. There has been a push recently to add more categories
for classifying domains.
Download
To transfer data from a remote computer to your computer via a network connection.
Drive Mapping
A method of defining a pointer to a data storage location, or drive. The letters of the alphabet are
used as the pointers, giving you 26 pointers to use to describe specific locations. The first five
letters of the alphabet (A through E) are traditionally used to point to local drives (floppy drives,
local hard drives, CD-ROM drives). On the network, a drive mapping serves as a bookmark,
allowing a user direct access to a particular location. A drive letter is used to represent a logical
drive, while a directory path leads to the specific location in the directory structure.
DVD-ROM
Digital Video (Versatile) Disc, Read Only Memory - A type of read-only optical disc. DVD-
ROMs are similar to CD-ROMs in that the data are stored in a laser-generated continuous spiral
on the disc surface. The difference is that DVD-ROMs store much more data (4.7GB or more) in
smaller pits in tighter circles. Capacity can be increased even more by adding a second layer of
pits over the first, and by using both sides of the disc. Experts believe DVD-ROMs will eventually
replace CD-ROMs.
Effective Rights
The actual rights that a user or group has to access a Camera Set or Individual Camera. Access
rights can be granted explicitly, or endowed by inheritance. Admin and users with Manager
rights have unrestricted access rights to all Camera Sets and Individual Cameras. While
effective rights are cumulative, a user or group needs to be granted access rights by means of
only one of these methods (explicit assignment, inheritance, or Manager rights) to effectively
access a Camera Set or Individual Camera.
EIDE
Enhanced Integrated Device (Drive) Electronics - A second generation IDE drive interface
that increases the previous maximum drive size. The data transfer rate is speeded up to more
than twice that of the IDE. Another name for EIDE is ATAPI.
Ethernet
A standard for connecting computers to a local area network (LAN), Ethernet is the most popular
type of LAN. It sends its communications through radiofrequency signals carried by coaxial cable
or other media. Developed by Xerox, it is sometimes called IEEE 802.3, which refers to the
standard that defines it. The most common form of Ethernet is 10BaseT, which refers to a peak
transmission speed of 10Mbps using copper twisted-pair cable.
Ethernet Address
The physical address of an Ethernet controller board, expressed as a 48-bit number in
hexadecimal notation. VR-N100U Ethernet addresses will always take the form 00 80 A1 XX XX
XX.
Factory Defaults
Reboot
A factory defaults reboot is one of the cycle options associated with the Reset button on the front
of the unit. (See Chapter Seven ΠTechnical Tips and Troubleshooting.) The system goes
through the preparation for reboot by terminating all network connections, writing outstanding
data to the hard drive, and closing all programs. Then, before it begins to start up again, all user
configurable parameters (security, user/group lists, server name, etc.) are reset to the settings
they were assigned at the factory, the default settings.
Fast Ethernet
See 100BaseT
Firmware
The software embedded in the nonvolatile memory, flash memory, of the VR-N100U, which can
be updated with a new program.
Flash Memory
Nonvolatile memory chips that can be reprogrammed with new instructions after the chips have
left the factory.
Frame Type
Data is transmitted on the network in blocks and these blocks are encapsulated by headers and
trailers that describe where the data came from, where it is going, and the size and integrity of
the data. This envelope of information, and the data it encapsulates, is called a packet or frame.
Over the years, different frame headers have been defined and used in data communications
over local area networks (LANs). Each set of frame headers represents a specific frame type. In
order for a device to decode a received frame, it must recognize the frame type used by the
sending node. There are four common Ethernet frame types: IEEE802.3, IEEE 802.2, Ethernet
II, and Ethernet SNAP. A VR-N100U using the IPX protocol supports all four frame types. A VR-
N100U using the IP protocol supports only the Ethernet II frame type.