Manual Date And Time Settings; Dynamic Dns; Auto Negotiation; Theory Of Operations - Motorola AP-51 Series Product Reference Manual

Introduction 1-21

1.2.29 Manual Date and Time Settings

As an alternative to defining a NTP server to provide access point system time, the access point can
now have its date and time set manually. A new Manual Date/Time Setting screen can be used to set
the time using a Year-Month-Day HH:MM:SS format.
For detailed information on manually setting the access point's system time, see Configuring Network
Time Protocol (NTP) on page 4-43.

1.2.30 Dynamic DNS

The access point supports the Dynamic DNS service. Dynamic DNS (or DynDNS) is a feature offered
by www.dyndns.com which allows the mapping of domain names to dynamically assigned IP
addresses. When the dynamically assigned IP address of a client changes, the new IP address is sent
to the DynDNS service and traffic for the specified domain(s) is routed to the new IP address. For
information on configuring the Dynamic DNS feature, see Configuring Dynamic DNS on page 5-25.

1.2.31 Auto Negotiation

Auto negotiation enables the access point to automatically exchange information (over either its LAN
or WAN port) about data transmission speed and duplex capabilities. Auto negotiation is helpful
when using the access point in an environment where different devices are connected and
disconnected on a regular basis. For information on configuring the auto negotiation feature, see
Configuring the LAN Interface on page 5-1 or Configuring WAN Settings on page 5-16

1.3 Theory of Operations

To understand access point management and performance alternatives, users need familiarity with
functionality and configuration options. The access point includes features for different interface
connections and network management.
The access point uses electromagnetic waves to transmit and receive electric signals without wires.
Users communicate with the network by establishing radio links between mobile units (MUs) and
access points.
The access point uses DSSS (direct sequence spread spectrum) to transmit digital data from one
device to another. A radio signal begins with a carrier signal that provides the base or center
frequency. The digital data signal is encoded onto the carriers using a DSSS chipping algorithm. The
radio signal propagates into the air as electromagnetic waves. A receiving antenna (on the MU) in
the path of the waves absorbs the waves as electrical signals. The receiving MU interprets