D-Link DWC-1000 User Manual page 76

Wireless Controller
S hort Guard Interval : Th e g u ard in t erv al is t h e d ead t ime, in n an o second s ,
b et ween OFDM s y mb o ls . Th e g u ard in t erv al p rev en t s In t er -Sy mb o l an d
In t er-Carrier In t erferen ce (ISI, ICI). Th e 802.11n mo d e allo ws fo r a
red u ct io n in t h is g u ard in t erv al fro m t h e a an d g d efin it io n o f 800
n an o second s t o 400 n an o s eco n d s . Red u cin g t h e g u ard in t erv al can y ield a
10% imp ro v emen t in d at a t h ro ugh p u t . Select o n e o f t h e fo llo win g o p t io n s :
S pace Ti me B l ock Code : Sp ace Time Blo ck Co d in g (STBC) is an 802.11n
t ech n iq ue in t ended t o imp ro v e t h e reliab ilit y o f d at a t ransmis sio ns. Th e d ata
s t ream is t ran s mit t ed o n mu lt ip le an t en n as s o t h e receiv in g s y s t em h as a
b et t er ch ance o f d et ect ing at least o n e o f t h e d at a s t reams . Select o n e o f t h e
fo llo win g o p t io n s :
Radi o Res ource Manag ement: Rad io Re s o u rce M eas u remen t (RRM ) mo d e
req u ires t h e W ireles s Sy s t em t o s en d ad d it io n al in fo rmat io n in b eaco n s ,
p ro b e res p onses, an d associat io n res p o n s es . En ab le o r d is ab le t h e s u p p o rt
fo r rad io res o u rce meas uremen t feat ure in t h e A P p ro file. Th e feat u re is s et
in d ep en d en t ly fo r each rad io an d is en ab led b y d efau lt .
No ACK: Select En ab le t o s p ecify t h at t h e A P s h o u ld n o t ackn o wled g e
frames wit h Qo s No A ck as t h e s erv ice clas s v alu e.
Mul ti cas t Tx Rate (Mbps ): Select t h e 802.11 rat e at wh ich t h e rad io
t ran s mit s mu lt icas t frames . Th e rat e is in M b p s . Th e lo wes t rat e in t h e 5
GHz b an d is 6 M b p s .
•
Enabl e : Th e A P t ran s mit s d at a u s in g a 400 n s g u ard In t erv al
wh en co mmu n icat in g wit h clien t s t h at als o s u p p o rt t h e 400 n s
g u ard in t erv al.
•
Di s abl e : Th e A P t ran s mit s d at a u s in g an 800 n s g u ard in t erv al.
•
Enabl e : Th e A P t ran s mit s t h e s ame d at a s t ream o n mu lt ip le
an t en n as at t h e s ame t ime.
•
Di s abl e : Th e A P d o es n o t t ran s mit s t h e s ame d at a o n mu lt ip le
an t en n as .
74
User Manual