Proxim AP-4000 Benutzerhandbuch

IEEE 802.11 Specifications

• In countries that require passive scanning for Mesh, the roam time may be higher.
• When an AP-4000M/4900M is mounted in a vehicle and is being used in a Mesh network, there will be limited 

connectivity when the vehicle is moving.

In 1997, the Institute of Electrical and Electronics Engineers (IEEE) adopted the 802.11 standard for wireless devices 
operating in the 2.4 GHz frequency band. This standard includes provisions for three radio technologies: direct sequence 
spread spectrum, frequency hopping spread spectrum, and infrared. Devices that comply with the 802.11 standard 
operate at a data rate of either 1 or 2 Megabits per second (Mbits/sec). 

In 1999, the IEEE modified the 802.11 standard to support direct sequence devices that can operate at speeds of up to 
11 Mbits/sec. The IEEE ratified this standard as 802.11b. 802.11b devices are backwards compatible with 2.4 GHz 
802.11 direct sequence devices (that operate at 1 or 2 Mbits/sec). Available Frequency Channels vary by regulatory 
domain and/or country. See 

 for details.

Also in 1999, the IEEE modified the 802.11 standard to support devices operating in the 5 GHz frequency band. This 
standard is referred to as 802.11a. 802.11a devices are not compatible with 2.4 GHz 802.11 or 802.11b devices. 802.11a 
radios use a radio technology called Orthogonal Frequency Division Multiplexing (OFDM) to achieve data rates of up to 
54 Mbits/sec. Available Frequency Channels vary by regulatory domain and/or country. See 

 for 

details. 

In 2003, the IEEE introduced the 802.11g standard. 802.11g devices operate in the 2.4 GHz frequency band using 
OFDM to achieve data rates of up to 54 Mbits/sec. In addition, 802.11g devices are backwards compatible with 802.11b 
devices. Available Frequency Channels vary by regulatory domain and/or country. See 

 for details.

There are several management and monitoring interfaces available to the network administrator to configure and 
manage an AP on the network:

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The HTTP Interface (Web browser Interface) provides easy access to configuration settings and network statistics from 
any computer on the network. You can access the HTTP Interface over your LAN (switch, hub, etc.), over the Internet, or 
with a “crossover” Ethernet cable connected directly to your computer’s Ethernet Port.

HTTPS provides an HTTP connection over a Secure Socket Layer. HTTPS is one of three

available secure management 

options on the AP; the other secure management options are SNMPv3 and SSH. Enabling HTTPS allows the user to 
access the AP in a secure fashion using Secure Socket Layer (SSL) over port 443. The AP supports SSLv3 with a 128-bit 
encryption certificate maintained by the AP for secure communications between the AP and the HTTP client. All 
communications are encrypted using the server and the client-side certificate.

The AP comes pre-installed with all required SSL files: default certificate, private key and SSL Certificate Passphrase 
installed. 

The Command Line Interface (CLI) is a text-based configuration utility that supports a set of keyboard commands and 
parameters to configure and manage an AP.