NetComm LIBERTY SERIES User Manual page 23

OPTION
B a nd
Ch a nn el
Au to C hanne l Ti me r ( m in )
5 4 g R ate
M u lticas t R ate
B a sic R ate
Fra gm entation Thre s hol d
R TS Th res h old
DT IM I nter val
B e acon I nter val
X press ™ Te c hnolog y
5 4 g M od e
5 4 g Prote c t ion
Pream ble Type
Trans m it Powe r
YML10WVR2
www.netcommlimited.com
DESCRIPTION
Th e n ew ame n dment al lows I E E E 80 2. 11 g u n i t s to fa ll bac k to speed s of 11 Mbps, so I EE E 802.11b and I E EE 802. 11g
d evices ca n co exi st in th e sa m e n e t wo r k .
All ows sele c tio n o f a spe ci fi c ch a n n e l ( 1- 1 1) or Auto mod e.
Th e Au to Ch an n e l times t h e l en g t h i t t a k e s to sc an in minutes.
I n Au to ( d e fa u lt) mo de, yo u r R o u ter u ses t h e m a x im um d ata rate and lowe rs t he d ata rate de pend ent on t he si gna l
s tre n g th . Th e app ro pr i ate se t t i n g is d e p en d e nt on si gnal st re ngth. O ther rates are d i screte value s bet ween 1 to
5 4 M bps.
S et tin g fo r mul ticast packet t ra n sm i ssi o n rate. ( 1- 54 M bps)
S et s basic t ran smissio n rate.
A t h resh o ld ( in bytes) d eter m i n e s w h e t h e r p a c k e ts will be fragm ented a nd at what s ize. Pack et s that exceed the
f ragme ntat io n th re sh ol d o f a n 80 2. 11 W L A N w i l l be split i nto sm aller units suit able for the c i rc ui t size. Pa ck e ts sma l l er
t h an th e specif ie d f ragment at i o n t h re sh o l d va l u e however are not f ra gmented. Va lues b et ween 256 a nd 2346 c an be
e nte red b ut sh o u ld remain at a d ef a u l t se t t i n g o f 2346. S e tt ing the Fragm ent at ion Thres hold too low m ay re sult i n poor
p er for ma n ce.
R e q u est To S en d ( R TS) speci f i es t h e p a c k e t s ize t hat exce ed s t he sp ecif ied R TS threshold, which t hen t r igger s the R TS/
C TS me ch an ism. S mal ler p ac k e t s a re se nt w i t ho u t usi ng R TS/ C TS. The d efa ult se tt ing of 2347 (m ax lengt h) will disa bl es
t h e R TS Th re sh o ld.
D eli ver y Traf f ic I n dicat io n M e ssa g e ( DT I M ) i s a l so k nown as B ea con R ate. The ent r y ra nge is a va lue be t ween 1 a n d
6 5 53 5. A DTIM is a co u ntd ow n va r i a b l e t h at i n fo r m s clie nts of t he nex t wind ow for listeni ng to broa d ca st a nd mu l tic a st
mes sag es. Wh e n th e AP h as b u f fe re d b ro a d c a st or mult ica st m essages for associate d clients, i t send s the nex t DTI M
w ith a DT IM I nter val val ue. A P C l i e nt s h e a r t h e b ea cons a nd awak en to recei ve t he broad c ast and mult ica st m es sa g es.
Th e d e fa ul t is 1 .
Th e amo u nt o f time be t we en b ea co n t ra n sm i ssi o ns in i s m i lli second s. The d e fault is 100 ms a nd t he accept a ble ra ng e
i s 1 – 6 55 3 5. The be acon t ra n sm i ssi o n s i d ent i f y t h e presence of a n a ccess poi nt. B y d efa ult, net wor k d evi ces passi vel y
s ca n all R F ch an n el s liste n in g fo r b e a co n s co m i n g from a ccess point s. B e fore a st at ion enters powe r save m od e, t he
s tat io n n e ed s th e b eaco n inter va l to k n ow w h en to wa k e up to rece i ve the bea con.
B roa dco m's Xpress™ Tech n o l o g y i s co m p l i a nt w i t h d raf t specifi c at i ons of t wo pla nned wi rele ss i nd us tr y st and a rd s. I t h a s
b ee n d esign e d to imp rove w i re l e ss n et wo r k e f f i c i enc y. Disa bled by d ef ault.
S ele c t Au to mo d e fo r greate st co m p at i b i l i t y. S e l ec t Per for ma nce m od e for t he fa stest p er for ma nce am ong 54g cer t i fied
e qu ip me nt. S el ec t LR S mo d e i f yo u a re ex p e r i en c ing d i ffi c ult y wi t h lega c y 802. 11b equi pment. I f t his d oes not wor k ,
yo u may also t r y 8 02 .11 b o n l y m o d e.
I n Au to mo de, t h e ro u te r wi l l u se R TS / C TS to i m p rove 802. 11g per for ma nce in m i xe d 802. 11g/ 802. 11b net wor k s. Tu r n in g
p ro te c tio n O f f w ill maximi ze 80 2. 11 g t h ro u g h p u t und er most cond it ions.
S h o r t pre amb le is inten de d fo r a p p l i c at i o n s w h ere m ax imum throughput is d esire d but it does not wor k wi t h leg a c y
e qu ip me nt. Lon g p rea mbl e wo r k s w i t h t h e cu r re nt 1 and 2 Mbit /s D SS S spe cifi c at i on as d escr ibed in I EE E Std 802.11-
1 9 99
S et th e p ower o u t pu t ( by pe rce nt a g e ) a s d esi re d.
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NETCOMM LIBERTY SERIES
23