User guide

HiPath Wireless Standalone 802.11n AP User Guide D-3
Device Server A specialized, network-based hardware device designed to
perform a single or specialized set of server functions. Print
servers, terminal servers, remote access servers and network
time servers are examples of device servers.
DHCP Dynamic Host Configuration Protocol. A protocol for assigning
dynamic IP addresses to devices on a network. With dynamic
addressing, a device can have a different IP address every time it
connects to the network. In some systems, the device's IP
address can even change while it is still connected. DHCP also
supports a mix of static and dynamic IP addresses.
DHCP consists of two components: a protocol for delivering host-
specific configuration parameters from a DHCP server to a host
and a mechanism for allocation of network addresses to hosts.
(IETF RFC1531.)
Option 78 specifies the location of one or more SLP Directory
Agents. Option 79 specifies the list of scopes that a SLP Agent is
configured to use.(RFC2610 - DHCP Options for Service Location
Protocol)
Directory Agent (DA) A method of organizing and locating the resources (such as
printers, disk drives, databases, e-mail directories, and
schedulers) in a network. Using SLP, networking applications can
discover the existence, location and configuration of networked
devices.
With Service Location Protocol, client applications are 'User
Agents' and services are advertised by 'Service Agents'. The User
Agent issues a multicast 'Service Request' (SrvRqst) on behalf of
the client application, specifying the services required. The User
Agent will receive a Service Reply (SrvRply) specifying the
location of all services in the network which satisfy the request.
For larger networks, a third entity, called a 'Directory Agent',
receives registrations from all available Service Agents. A User
Agent sends a unicast request for services to a Directory Agent (if
there is one) rather than to a Service Agent.
(SLP version 2, RFC2608, updating RFC2165)
Diversity antenna and receiver The AP has two antennae. Receive diversity refers to the ability of
the AP to provide better service to a device by receiving from the
user on which ever of the two antennae is receiving the cleanest
signal. Transmit diversity refers to the ability of the AP to use its
two antenna to transmit on a specific antenna only, or on a
alternate antennae. The antennae are called diversity antennae
because of this capability of the pair.
DNS Domain Name Server
DSSS Direct-Sequence Spread Spectrum. A transmission technology
used in Local Area Wireless Network (LAWN) transmissions
where a data signal at the sending station is combined with a
higher data rate bit sequence, or chipping code, that divides the
user data according to a spreading ratio. The chipping code is a
redundant bit pattern for each bit that is transmitted, which
increases the signal's resistance to interference. If one or more
bits in the pattern are damaged during transmission, the original
data can be recovered due to the redundancy of the transmission.
(Compare FHSS)
DTIM DTIM delivery traffic indication message (in 802.11 standard)
Term Definition