D-Link DCS-G900 - Manual (Page 23)

23
DCS-G900 User’s Manual
D-Link Systems, Inc.
DCS-G900 Configuration
Advanced > Wireless (continued)
A preamble is a signal used in network communications to synchronize
the transmission timing between two or more systems. Proper timing
ensures that all systems are interpreting the start of the information
transfer correctly. Part of the frame that is transmitted by an 802.11
station is called the preamble. The original 802.11 specification (which
defined only 1 and 2Mbps operation), defined only a long preamble that
uses a 128 bit sync field. When the high rate, i.e. 11Mbps, 802.11b
standard was created, an optional short preamble using a 56 bit sync
field was added. This was intended to improve the efficiency of the
wireless network for more real-time applications such as streaming
video. Selecting short preamble may improve video quality.
Preamble:
Advanced > Wireless > Site Survey
This screen displays all available wireless networks, along with their SSID, MAC, Channel,
Encryption, and Signal Strength information.