User's Manual
Table Of Contents
- 186_1100_001_04
- 1. PURPOSE
- The purpose of this document is to provide specifications for the CarFi User’s guide for the Stewart Autonet branded router.
- 2. SCOPE
- This document applies to the fabrication and assembly of the Stewart CarFi User’s guide.
- 3. RESPONSIBILITIES
- It is the responsibility of contract manufacturer/packaging supplier to follow this document, or create an approved internal document.
- 4. DEFINITIONS
- 5. APPLICABLE DOCUMENTS
- 6. DIMENSIONS
- 7. MATERIALS/PROCESS
- 8. TESTING
- 9. REVISION SYNOPSIS
- 10. Approvals
- 186_1100_001_04_pg_22
- 186_1100_001_04
Configuring Wireless Settings (continued)
Channel
Direct communication between an 802.11 Radio card and an access point occurs over a
common channel frequency. The FCC allows channels 1 through 11 within the U.S. An
important concept to note regarding channel assignments is that the channel actually
represents the center frequency that the transceiver within the radio and access point uses
(e.g., 2.412 GHz for channel 1 and 2.417 GHz for channel 2). There is only 5 MHz separation
between the center frequencies, and an 802.11b signal occupies approximately 30 MHz of
the frequency spectrum. The signal falls within about 15 MHz of each side of the center
frequency. As a result, an 802.11b signal overlaps with several adjacent channel frequencies.
This leaves you with only three channels (channels 1, 6, and 11 for the U.S.) That you can
use without causing interference between access points.
TxPower
This allows you to set the transmit power of the radio. Setting a lower value limits the range o
f
the radio and reduces interference with other access points. (default: 19 recommended)
Bit rate
This allows you to set the bit rate in Mbs. The bit rate is the speed at which bits are
transmitted over the medium. The user speed of the link is lower due to medium sharing and
various overhead. Select a value to lock the card to a particular bit rate. If you specify auto,
the driver will use all bit rates to find an optimum rate. (default: auto recommended)
RTS threshold
RTS/CTS adds a handshake before each packet transmission to make sure that the channel
is clear. This adds overhead, but Increases performance in case of hidden nodes or a large
number of active nodes. This parameter sets the size of the smallest packet for which the
node sends rts; a value equal to the maximum packet size disables the mechanism. You may
also set this parameter to off. (default: off recommended)
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