User's Manual

Appendix D Wireless LANs

B222s User’s Guide

233

I f t he Fr a gm ent at ion Thr e sh old value is sm aller t han t he RTS/ CTS value ( see previously) you

set t hen t he RTS (Request To Send)/ CTS ( Clear to Send) handshake will never occur as dat a fram es

will be fragm ented before they reach RTS/ CTS size.

Preamble Type

Pream ble is used t o signal t hat dat a is com ing t o t he receiver. Short and long refer to t he length of

the synchronizat ion field in a packet.

Short pream ble incr eases perform ance as less tim e sending pream ble m eans m ore tim e for sending

dat a. All I EEE 802.11 com pliant wireless adapt ers support long pream ble, but not all support short

pream ble.

Use long pream ble if you are unsure what pream ble m ode ot her wireless devices on t he net work

support , and to provide m ore reliable com m unicat ions in busy wireless net w orks.

Use short pream ble if you are sure all wireless devices on t he network support it , and t o provide

m ore efficient com m unicat ions.

Use t he dynam ic setting t o aut om at ically use short pream ble w hen all wireless devices on t he

network support it , ot herwise the LTE Device uses long pream ble.

Not e: The wireless dev ices MUST use the sam e pream ble m ode in order t o com m unicat e.

IEEE 802.11g Wireless LAN

I EEE 802.11g is fully com pat ible w ith the I EEE 802.11b st andard. This m eans an I EEE 802.11b

adapt er can int erface direct ly with an I EEE 802.11g access point ( and vice versa) at 11 Mbps or

lower depending on range. I EEE 802.11g has several interm ediate rate st eps bet ween the

m axim um and m inim um data rat es. The I EEE 802.11g dat a rat e and m odulation are as follows:

Wireless Security Overview

Wireless securit y is vit al to your network to prot ect wireless com m unicat ion bet w een wireless

clients, access point s and t he wired network.

Wireless securit y m ethods available on the LTE Device are data encrypt ion, wireless client

authent icat ion, restrict ing access by device MAC address and hiding t he LTE Device identit y.

Table 85 I EEE 802.11g

DATA RATE (MBPS) MODULATION

1 DBPSK ( Differential Binary Phase Shift Keyed)

2 DQPSK (Different ial Quadrat ur e Phase Shift Keying)

5.5 / 11 CCK ( Com plem ent ary Code Keying)

6/ 9/ 12/ 18/ 24/ 36/ 48/

OFDM ( Or t hogonal Frequency Division Mult iplexing)