Proxim wireless ORiNOCO AP-4000MR-LR User's Guide download pdf (Page 61)

Advanced Configuration AP-4000MR User Guide

Interfaces

NOTE: Turbo mode is supported in only in 802.11a mode in the FCC regulatory domain when DFS is not required.

If turbo mode is enabled, then this is displayed in the web UI and the transmit speeds and channels

pull-down menus are updated with the valid values.

• DTIM Period: The Deferred Traffic Indicator Map (DTIM) Period determines when to transmit broadcast and multicast

packets to all clients. If any clients are in power save mode, packets are sent at the end of the DTIM period. This

parameter supports a range between 1 and 255; it is recommended to leave the DTIM at its default value unless

instructed by technical support. Higher values conserve client battery life at the expense of network performance for

broadcast or multicast traffic.

• RTS/CTS Medium Reservation: The 802.11 standard supports optional RTS/CTS communication based on packet

size. Without RTS/CTS, a sending radio listens to see if another radio is already using the medium before transmitting

a data packet. If the medium is free, the sending radio transmits its packet. However, there is no guarantee that

another radio is not transmitting a packet at the same time, causing a collision. This typically occurs when there are

hidden nodes (clients that can communicate with the Access Point but are out of range of each other) in very large

cells.

When RTS/CTS occurs, the sending radio first transmits a Request to Send (RTS) packet to confirm that the medium

is clear. When the receiving radio successfully receives the RTS packet, it transmits back a Clear to Send (CTS)

packet to the sending radio. When the sending radio receives the CTS packet, it sends the data packet to the

receiving radio. The RTS and CTS packets contain a reservation time to notify other radios (including hidden nodes)

that the medium is in use for a specified period. This helps to minimize collisions. While RTS/CTS adds overhead to

the radio network, it is particularly useful for large packets that take longer to resend after a collision occurs.

RTS/CTS Medium Reservation is an advanced parameter and supports a range between 0 and 2347 bytes. When set

to 2347 (the default setting), the RTS/CTS mechanism is disabled. When set to 0, the RTS/CTS mechanism is used

for all packets. When set to a value between 0 and 2347, the Access Point uses the RTS/CTS mechanism for packets

that are the specified size or greater. You should not need to enable this parameter for most networks unless you

suspect that the wireless cell contains hidden nodes.

• Antenna Gain: This parameter modifies the sensitivity of the radio card when detecting radar signals in accordance

with Dynamic Frequency Selection/Radar Detection (DFS/RD) requirements. Given that the radar detection threshold

is fixed by the regulatory codes in the country of operation, and that a variety of antennas with different gains may be

attached to the unit, adjust this threshold to account for higher than expected antenna gains and avoid false radar

detection events. Set this parameter to a value between 0 and 35. The default value is 0.

• Wireless Service Status: The user can shut down (or resume) the wireless service on the wireless interface of the

AP through the CLI, HTTP, or SNMP interface. Select Shutdown to shutdown the wireless service on a wireless

interface, or to Resume to resume wireless service. When the wireless service on a wireless interface is shut down,

the AP will:

– Stop the AP services to wireless clients connected on that wireless interface by disassociating them

– Disable the associated BSS ports on that interface

– Disable the transmission and reception of frames on that interface

– Indicate the wireless service shutdown status of the wireless interface through LED and traps

– Enable Ethernet interface so that it can receive a wireless service resume command through CLI/HTTP/SNMP

interface

NOTE: WSS disables BSS ports.

NOTE: The wireless service cannot be shutdown on an interface where Rogue Scan is enabled.

NOTE: Wireless service can be shut down/resumed on each wireless interface individually.

In shutdown state, AP will not transmit and receive frames from the wireless interface and will stop transmitting

periodic beacons. Moreover, none of the frames received from the Ethernet interface will be forwarded to that wireless

interface.

Wireless service on a wireless interface of the AP can be resumed through CLI/HTTP/SNMP management interface.

When wireless service on a wireless interface is resumed, the AP will:

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Proxim wireless ORiNOCO AP-4000MR-LR User's Guide Page 61

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