User's Manual

ACR-201-G Technical Manual

Transmitted wireless packets larger than this size will use the RTS/CTS

protocol to (a) maintain performance in noisy wireless networks and (b)

prevent hidden nodes from degrading performance. To minimize the

potential packet collision associated with hidden nodes in a wireless

network, IEEE 802.11 standard has the option to complete a “Request to

Send (RTS)” and “Clear to Send (CTS)” two-frame exchange prior to

sending the real data. This reduces the throughput of the real data. Since

the probability of packet collision increases with the size of the packets

transmitted, an optimum trade-off between data-throughput and data-

integrity may be reached by turning on the two-frame exchange only for

data packets exceeding a certain size. The number entered in this field is

that threshold packet size in Bytes. For example, if “500” is entered, data

packets with sizes less than 500 bytes are transmitted without being

preceded by the RTS-CTS exchange and thereby taking a small risk of

getting corrupted by packet collisions. If “2346” (the maximum 802.11 data

frame size) or a larger number is entered, then every data packet is

transmitted without being preceded by the RTS-CTS exchange and

thereby maximizing the data throughput. The valid range of RTS threshold

is 0 to 3000.

Maximum burst time

This is also known as PRISM Nitro (tm) technology. The technology uses

fully standards-compliant methods that eliminate collisions in mixed-mode

networks, while greatly increases the performance of both pure 802.11g

and mixed 802.11b/g networks. The setting is for the amount of time the

radio will be reserved to send data without requiring an ACK. This number

is in units of microseconds. A typical value would be 1000 microseconds.

When this number is zero, bursting is disabled.

3. Firmware Upgrade

Allow Upgrade Uploads

If this box is checked, it enables the TFTP server that is used to accept

firmware upgrades. Leave this box unchecked during normal operation.

Only check the box when you are upgrading the access point firmware.

Admin

In this web page, users are able to change settings, which are used for

administration purposes. The web page is divided into four sections: Device

Name, IP settings, Security, and Commands.

1. Device Name:

Device Name

This is the name that the bridge will use to identify itself to external

configuration and IP-address-finding programs. This is not the same as

the SSID. It is okay to leave this blank if you are not using these

programs.