User's Manual

RLX2 Industrial Hotspot Series
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Page202of208 ProSoftTechnology,Inc.
 February5,2015
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Spread Spectrum
Aformofwirelesscommunicationinwhichasignal’sfrequencyisdeliberatelyvaried.
Thisincreasesbandwidthandlessensthechancesofinterruptionorinterceptionofthe
transmittedsignal.
SSI
ServiceSetIdentifierisasequenceofcharactersuniquetoaspecificnetworkor
networksegmentthat’susedbythenetworkandallattacheddevicestoidentify
themselvesandallowdevicestoconnecttothecorrectnetworkwhenoneormorethan
oneindependentnetworkisoperatinginnearbyareas.
Subnet Mask
AmaskusedtodeterminewhatsubnetanIPaddressbelongsto.AnIPaddresshastwo
components:thenetworkaddress,andthehost(nodeordevice)address.Forexample,
considertheIPaddress150.215.017.009.AssumingthisispartofaClassBnetwork
(withasubnetmaskof255.255.0.0),thefirsttwonu
mbers(150.215)representthe
ClassBnetworkaddress,andthesecondtwonumbers(017.009)identifyaparticular 
hostonthisnetwork.
T
TKIP
TemporalKeyIntegrityProtocol.ThewirelesssecurityencryptionmechanisminWi‐Fi
ProtectedAccess.TKIPusesakeyhierarchyandkeymanagementmethodologythat
removesthepredictabilitythatintrudersreliedupontoexploittheWEPkey.In
increasesthesizeofthekeyfrom40to128bitsandreplacesWE
P’ssinglestatickey
withkeysthataredynamicallygeneratedanddistributedbyanauthenticationserver,
providingsome500trillionpossiblekeysthatcanbeusedonagivendatapacket.Ifalso
includesaMessageIntegrityCheck(MIC),designedtopreventtheattackerfrom
capturingdatapackets,alteringthem,an
dresendingthem.Bygreatlyexpandingthe
sizeofkeys,thenumberofkeysinuse,andbycreatinganintegritychecking
mechanism,TKIPmagnifiesthecomplexityanddifficultyinvolvedindecodingdataona
Wi‐Finetwork.TKIPgreatlyincreasesthestrengthandcomplexityofwireless
encryption,makingitfarmoredifficult(ifnoti
mpossible)forawould‐beintruderto
breakintoaWi‐Finetwork.