ZyXEL 91-005-124003B Datasheet download pdf (Page 162)

G-1000 User’s Guide

162 Wireless LANs

A large Fragmentation Threshold is recommended for networks not prone to interference

while you should set a smaller threshold for busy networks or networks that are prone to

interference.

If the Fragmentation Threshold value is smaller than the RTS/CTS value (see previously)

you set then the RTS (Request To Send)/CTS (Clear to Send) handshake will never occur as

data frames will be fragmented before they reach RTS/CTS size.

Preamble Type

A preamble is used to synchronize the transmission timing in your wireless network. There are

two preamble modes: Long and Short.

Short preamble takes less time to process and minimizes overhead, so it should be used in a

good wireless network environment when all wireless stations support it.

Select Long if you have a ‘noisy’ network or are unsure of what preamble mode your wireless

stations support as all IEEE 802.11b compliant wireless adapters must support long preamble.

However, not all wireless adapters support short preamble. Use long preamble if you are

unsure what preamble mode the wireless adapters support, to ensure interpretability between

the AP and the wireless stations and to provide more reliable communication in ‘noisy’

networks.

Select Dynamic to have the AP automatically use short preamble when all wireless stations

support it, otherwise the AP uses long preamble.

Note: The AP and the wireless stations MUST use the same preamble mode in order

to communicate.

IEEE 802.11g Wireless LAN

IEEE 802.11g is fully compatible with the IEEE 802.11b standard. This means an IEEE

802.11b adapter can interface directly with an IEEE 802.11g access point (and vice versa) at

11 Mbps or lower depending on range. IEEE 802.11g has several intermediate rate steps

between the maximum and minimum data rates. The IEEE 802.11g data rate and modulation

are as follows:

Table 67 IEEE 802.11g

DATA RATE (MBPS) MODULATION

1 DBPSK (Differential Binary Phase Shift Keyed)

2 DQPSK (Differential Quadrature Phase Shift Keying)

5.5 / 11 CCK (Complementary Code Keying)

6/9/12/18/24/36/48/54 OFDM (Orthogonal Frequency Division Multiplexing)

1 2 ... 157 158 159 160 161 162 163 164 165 166 167 ... 191 192

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ZyXEL 91-005-124003B Datasheet Page 162