Numbers |
|
100Base-T |
|
Also known as Fast Ethernet. Refers to the 100MBit/s network
technology over TUP cable that is compatible with the IEEE 802.3u standard.
This is a collision-detect technology, i.e., a transmission that collides
with another packet already on the LAN, requires retransmitting the new
packet. Various physical layer specifications exist, such as 100Base-TX
which uses 2 pairs of Category 5 UTP cable up to 100m in length.
|
|---|
|
10Base-T |
|
The name commonly used to refer to the older LAN technology which
preceeded 100Base-T. Similar to 100Base-T, but running at 10MBit/s.
|
|---|
A |
|
adapter |
|
An add-on computer interface card and circuitry that provides the
physical connection and data translation between the host computers's I/O
bus and external devices or networks. |
|---|
|
adapter slot |
|
The location where adapters attach to the backplane.
|
|---|
|
auto-negotiation |
|
Uses a series of link pulses to encode hardware capability
information, such that a hub and end node can agree upon the
highest-performing configuration both are capable of using.
|
|---|
B |
|
backplane |
|
For an I/O bus. The computer's circuitry and connectors to which
adapter cards connect. |
|---|
C |
|
CAT Category |
|
A cable quality rating. 100Base-T requires CAT-5 cable. See
LAN cable. |
|---|
|
collision |
|
The result of two or more nodes on an 802.3 network transmitting at
the same time, producing a garbled transmission. |
|---|
D |
|
driver |
|
A portion of system code that allows communication between the
operating system and the network card. |
|---|
E |
|
Ethernet |
|
A LAN that uses the CSMA/CD method of access and transmits at
10Mbit/s on a bus or star topology. The IEEE 802.3 standard evolved from
Ethernet, but they are not exactly the same. Network devices based on both
standards can co-exist on the same medium, but they cannot exchange data
directly without special "bilingual" software that can decode packets of
both types. The drivers for the HP3000 network cards fit this requirement
if configured correctly. |
|---|
|
Ethernet address |
|
See station address. |
|---|
H |
|
HP-PB |
|
HP Precision Bus. Refers to the hardware I/O architecture. The
precision bus is the bus thru which these cards communicate with the CPU
and memory. |
|---|
I |
|
IEEE 802.3u standard |
|
Part of the institute of Electrical and Electronics Engineers 802
family of LAN standards. The 802.3u standard extends the 802.3 MAC layer
to 100MBit/s, and defines a new family of 100BBit/s physical layers
(layer 1), such as 100Base-TX, 100Base-T4, or 100Base-FX. These are
connected through a media independent access layer (MII).
|
|---|
L |
|
LAN |
|
See local area network. |
|---|
|
LAN cable |
|
The medium through which data moves in a LAN, LAN cables come in many
types. For example, thick (10 mm) coaxial cable, thin (5 mm) coaxial cable,
fiber-optic cable, and shielded or unshielded twisted-pair cable. The
100Base-T cables are UTP CAT-5 only, even for 10MBit/s operation.
|
|---|
|
LED |
|
See light emitting diode. |
|---|
|
light emitting diode |
|
A small light on a device that is often used to provide status
information. |
|---|
|
link beat |
|
A periodic signal transmitted in Ethernet and IEEE 802.3 Type
10Base-T networks to inform one station of device of the presence of
another. It also helps verify the integrity of the network link between
them. (Also called "link test pulse".) |
|---|
|
local area network |
|
A general-purpose communications network that interconnects a variety
of devices within a limited geographical area. A LAN might connect
computers on adjacent desks, within a building, or within several
buildings of a campus. |
|---|
M |
|
MAC address |
|
See station address. |
|---|
|
Mbits/ |
|
Megabits per second defined as (1,000,000 bits per second).
|
|---|
|
medium, media |
|
The transmission connection between nodes. Most current LANs use
cables (fiber-optic or copper), although radio and other broadcast media
are possible. |
|---|
N |
|
node |
|
A station; a physical device that allows for the transmission of data
within a network. |
|---|
P |
|
packet |
|
A bit stream consisting of predefined fields that contain data,
addresses, and control information. In the IEEE 802.3 environment this
structure is often referred to as the 'MAC frame". Packet is the more
commonly used term, and originated in the Ethernet environment.
|
|---|
|
Precision Bus |
|
See HP-PB. |
|---|
|
protocol |
|
The set of rules governing the operation of functional units of a
communication system that must be followed if communication is to be
achieved. |
|---|
R |
|
ring network |
|
A network configuration where a series of attaching devices are
connected by unidirectional links to form a closed path.
|
|---|
|
ring topology |
|
A logically circular, unidirectional transmission path without
defined ends. Control can be distributed or centralized. See
topology. |
|---|
|
RJ-45 |
|
A standard defining the pin assignments for an 8-pin modular plug for
4-pair twisted wire network cable. |
|---|
S |
|
slot |
|
The physical place in the back of the computer where a card plugs in.
Each slot has a number. |
|---|
|
star topology |
|
A logically star-shaped network layout where all traffic is passed
through a single point (usually a hub). Hubs can then be connected to form
multiple starts. |
|---|
|
Station address |
|
A 12-digit hexadecimal number that identifies a specific network node,
and allows messages to be directed to that node only. The first 6 digits
are the same for all cards from a particular manufacturer. Each
manufacturer is assigned a different 6-digit value. Then each card
produced by that manufacturer has a different last 6 digits. This ensures
that all cards from all manufacturers have a unique station address. HP
manufactures cards with the first 6 digits being 080009 or 0060B0. A
default value is permanently coded into each card, but this default can be
overridden by the configuration. |
|---|
T |
|
token ring |
|
A network with a ring topology that uses a token for the purpose of
establishing control. Control of the network is passed with the token from
one network device to another. |
|---|
|
topology |
|
Topology can be physical or logical. Physical topology is the
configuration of network nodes and links; a description of the physical
geometric arrangement of the links and nodes. Logical topology is a
description of the possible logical connections between network nodes
indicating which pairs of nodes are able to communicate whether or not
they have a direct physical connection. |
|---|
U |
|
UTP |
|
Unshielded Twisted Pair. See LAN cable. |
|---|
