OAOIIEIAEss NAOAE TOKEN RING
AAAAeAIEA
Oaoiieiaey naoae Token Ring auea aia?aua i?aaenoaaeaia IBM a 1982 a. e
a 1985 a. auea aeeth/aia IEEE (Institute for Electrical and Electronic Engeneers) eae
noaiaea?o 802.5.
Token Ring iii?aaeiaio yaeyaony iniiaiie oaoiieiaeae IBM aeey eieaeueiuo
naoae (LAN), onooiay ii iiioey?iinoe n?aaee oaoiieiaee LAN oieueei Ethernet/IEEE 802.3.
Naoe Token Ring ?aaioatho n aeaoiy aeoiauie nei?inoyie – 4 Ia/n e 16
Ia/n. Ia?aay nei?inoue ii?aaeaeaia a noaiaea?oa 802.5, a aoi?ay yaeyaony iiaui
noaiaea?oii aea-oaeoi, iiyaeaoeiny a ?acoeueoaoa ?acaeoey oaoiieiaee Token Ring.
A Token Ring eaaaee iiaeeeth/athony ii noaia “caacaea”, iaeiaei ii
ooieoeeiie?oao eae eiae/aneia eieueoei .
A eiae/aneii eieueoea oee?eoee?oao ia?ea? (iaaieueoie eaae? niaoeeaeueiiai
oi?iaoa, iacuaaaiue eiiaaea oieaiii), eiaaea ii aeioiaeeo aei noaioeee, oi iia
caoaaouaaao eaiae. Ia?ea? anaaaea oee?eoee?oao a iaeiii iai?aaeaiee. Ocae,
iieo/athuee ia?ea? o aeeaeaeoaai auoa?aniieiaeaiiiai aeoeaiiai ninaaea ia?aaeaao
aai ieaea?aniieiaeaiiiio. Eaaeaeay noaioeey a eieueoea iieo/aao aeaiiua ec caiyoiai
ia?ea?a e ioi?aaeyao eo ( a oi/iinoe iiaoi?yy ia?ea?) ninaaeiaio oceo naoe.
Oaeei niiniaii aeaiiua oee?eoee?otho ii eieueoeo aei oao ii?, iiea ia aeinoeaioo
noaioeee – aae?anaoa. A naith i/a?aaeue yoa noaioeey nio?aiyao aeaiiua e ia?aaeaao
eo i?ioieieai aa?oiaai o?iaiy a eaae? ia?aaeaao aeaeueoa (iiiaiya a iai aeaa aeoa
– i?eciae iieo/aiey). Eiaaea ia?ea? aeinoeaaao noaioeee-ioi?aaeoaey – ii
aunaiaiaeaeaaony, e aeaeaa i?ioeann i?iaeieaeaaony aiaeiae/ii.
A naoyo Token Ring 16 Ia/n eniieuecoaony oaeaea ianeieueei ae?oaie aeai?eoi
aeinooia e eieueoeo, iacuaaaiue aeai?eoiii “?aiiaai inaiaiaeaeaiey ia?ea?a”
(Early Token Release). A niioaaonoaee n iei noaioeey ia?aaeaao ia?ea? aeinooia
neaaeothuae noaioeee n?aco aea iinea ieii/aiey ia?aaea/e iineaaeiaai aeoa eaae?a,
ia aeiaeeaeaynue aica?auaiey ii eieueoeo yoiai eaae?a n aeoii iiaeoaa?aeaeaiey i?eaia.
A yoii neo/aa i?iioneiay niiniaiinoue eieueoea eniieuecoaony aieaa yooaeoeaii e
i?eaeeaeaaony e 80 % io iiieiaeueiie. Eiaaea eioi?iaoeeiiiue aeie oee?eoee?oao ii
eieueoeo, ia?ea? a naoe ionoonoaoao (anee oieueei eieueoei ia iaania/eaaao
“?aiiaai inaiaiaeaeaiey ia?ea?a”), iiyoiio ae?oaea noaioeee, aeaeathuea ia?aaeaoue
eioi?iaoeeth, auioaeaeaiu iaeeaeaoue.Oaeei ia?acii ii naoe iiaeao a iaeei iiiaio
a?aiaie ia?aaeaaaoueny oieueei iaeei iaeao neaaeiaaoaeueii, a naoyo Token Ring ia
iiaeao auoue eieeecee. Anee iaania/eaaaony ?aiiaa aunaiaiaeaeaiea ia?ea?a, oi
iiaue ia?ea? iiaeao auoue auiouai iinea caaa?oaiey ia?aaea/e aeiea aeaiiuo.
Naoe Oikan Ring eniieuecotho neiaeioth nenoaio i?ei?eoaoia, eioi?ay
iicaieyao iaeioi?ui noaioeeyi n aunieei i?ei?eoaoii, iacia/aiiui
iieueciaaoaeai, aieaa /anoi iieueciaaoueny naoueth. Aeiee aeaiiuo Token Ring
niaea?aeao aeaa iiey, eioi?ua oi?aaeytho i?ei?eoaoii: iiea i?ei?eoaoia e iiea
?aca?ae?iaaiey.
Oieueei noaioeee n i?ei?eoaoii, eioi?ue ?aaai eee auoa aaee/eiu i?ei?eoaoa,
niaea?aeauaeny a ia?ea?a, iiaoo caaeaaeaoue ei. Iinea oiai, eae ia?ea? caoaa/ai
e eciaiai( a ?acoeueoaoa /aai ii i?aa?aoeeny a eioi?iaoeeiiiue aeie), oieueei
noaioeee, i?ei?eoao eioi?uo auoa i?ei?eoaoa ia?aaeathuae noaioeee, iiaoo
ca?aca?ae?iaaoue ia?ea? aeey neaaeothuaai i?ioiaea ii naoe. I?e aaia?aoeee
neaaeothuaai ia?ea?a a iaai aeeth/aaony aieaa aunieee i?ei?eoao aeaiiie
?aca?ae?othuae noaioeee. Noaioeee, eioi?ua iiauoatho o?iaaiue i?ei?eoaoa ia?ea?a,
aeieaeiu ainnoaiiaeoue i?aaeuaeouee o?iaaiue i?ei?eoaoa iinea caaa?oaiey ia?aaea/e.
Eiaaea eieueoei onoaiiaeaii, eioa?oaen eaaeaeie noaioeee o?aieo aae?ana
i?aaeoanoaothuae noaioeee e iineaaeothuae noaioeee a eieueoea. Ia?eiaee/anee
aea?aeaoaeue ia?ea?a ?annueaao iaeei ec SOLICIT_SUCCESSOR eaae? , i?aaeeaaay iiaui
noaioeeyi i?eniaaeeieoueny e eieueoeo. A yoii eaae?a oeacaiu aae?an ioi?aaeoaey e
aae?an neaaeothuee ca iei noaioeee a eieueoea. Noaioeee n aae?anaie a yoii aeeaiaciia
aae?ania iiaoo i?eniaaeeieoueny e eieueoeo. Oaeei ia?acii nio?aiyaony
oii?yaei/aiiinoue ( ii aic?anoaieth) aae?ania a eieueoea. Anee ie iaeia noaioeey ia
ioeeeeioeanue ia SOLICIT_SUCCESSOR eaae?, oi noaioeey-iaeaaeaoaeue ia?ea?a
cae?uaaao ieii ioaaoa e i?iaeieaeaao ooieoeeiie?iaaoue eae iau/ii. Anee anoue
?iaii iaeei ioeeee, oi ioeeeeioaoayny noaioeey aeeth/aaony a eieueoei e
noaiiaeoueny neaaeothuae a eieueoea. Anee aeaa eee aieaa noaioeee ioeeeeioeenue, oi
oeene?oaony eieeecey. Noaioeey-iaeaaeaoaeue ia?ea?a caioneaao aeai?eoi
?ac?aoaiey eieeecee, iinueay eaae? RESOLVE_CONTENTION. Yoio aeai?eoi –
iiaeeoeeaoeey aeai?eoia ia?aoiiai aeaie/iiai n/ao/eea ia aeaa ?ac?yaea.
O eaaeaeie noaioeee a eioa?oaena anoue aeaa aeo, onoaiaaeeaaaiuo neo/aeii. Eo
cia/aiey 0,1,2 e 3. Cia/aiea yoeo aeoia ii?aaeaeytho aaee/eio caaea?aeee, i?e
ioeeeea noaioeee ia i?eaeaoaiea iiaeeeth/eoueny e eieueoeo. Cia/aiey yoeo aeo
ia?aonoaiaaeeaathony eaaeaeua 50mnae.
I?ioeaaeo?a iiaeeeth/aiey iiaie noaioeee e eieueoeo ia ia?ooaao iaeooaeoaa
aa?aioe?iaaiiia a?aiy aeey ia?aaea/e ia?ea?a ii eieueoeo. O eaaeaeie noaioeee anoue
oaeia?, eioi?ue na?anuaaaony eiaaea noaioeey iieo/aao ia?ea?. I?aaeaea /ai ii
aoaeao na?ioai aai cia/aiea n?aaieaaaony n iaeioi?ie aaee/eiie. Anee iii
aieueoa, oi i?ioeaaeo?a iiaeeeth/aiey noaioeee e eieueoeo ia caioneaaony. A ethaii
neo/aa ca iaeei ?ac iiaeeeth/aaony ia aieaa iaeiie noaioeee ca iaeei ?ac.
Oai?aoe/anee noaioeey iiaeao aeaeaoue iiaeeeth/aiey e eieueoeo neieue oaiaeii aeieai, ia
i?aeoeea ia aieaa ianeieueeeo naeoiae. Iaeiaei, n oi/ee c?aiey i?eeiaeaiee
?aaeueiiai a?aiaie yoi iaeii ec iaeaieaa neaauo iano 802.4.
Ioeeth/aiea noaioeee io eieueoei i/aiue i?inoi. Noaioeey O n
i?aaeoanoaaiieeii S e iineaaeiaaoaeai ? oeao eaae? SET_SUCCESSOR, eioi?ue
oeacuaaao ? /oi ioiuia aai i?aaeoanoaaiieeii yaeyaony S. Iinea yoiai O
i?ae?auaao ia?aaea/o.
Eieoeeaeecaoeey eieueoea – yoi niaoeeaeueiue neo/ae iiaeeeth/aiey noaioeee e eieueoeo.
A ia/aeueiue iiiaio noaioeey aeeth/aaony e neooaao eaiae. Anee iia ia
iaia?oaeeaaao i?eciaeia ia?aaea/e, oi iia aaia?e?oao CLAIM_TOKEN ia?ea?.
Anee eiieo?aioia ia iaia?oaeeeinue, oi iia aaia?e?oao ia?ea? naia e
onoaiaaeeaaao eieueoei ec iaeiie noaioeee. Ia?eiaee/anee iia aaia?e?oao eaae?u
SOLICIT_SUCCESSOR, i?eaeaoay ae?oaea noaioeee aeeth/eoueny a eieueoei. Anee a
ia/aeueiue iiiaio n?aco aeaa noaioeee auee aeeth/aiu, oi caioneaaony aeai?eoi
ia?aoiiai aeaie/iiai n/ao/eea n aeaoiy ?ac?yaeaie.
Iiae ISU (Information Symbol Unit) iiieiaaony aaeeieoea ia?aaea/e eioi?iaoeee
IAUAss *ANOUe
A naoyo Token Ring eniieuecothony ?acee/iua oeiu eaae?ia:
Data/Command Frame (eaae? oi?aaeaiey/aeaiiua), Token (ia?ea?), Abort (eaae?
na?ina).
Aiia?aoiia iaania/aiea naoae Token Ring
I?e iiaeeeth/aiee ono?ienoa a ARCNet i?eiaiytho oiiieiaeth oeia eee caacaea.
Aaeaioa?u ARCNet iiaeaea?aeeaatho iaoiae aeinooia Token Bus (ia?ea?iay oeia)
Niaoaiea noaioeee, ?aaioathueo ia ?acee/iuo nei?inoyo, a iaeiii eieueoea ia
aeiioneaaony.
EIEEECEE
Ec-ca ioeaie ia?aaea/ e naiaa iai?oaeiaaiey iiaoo aicieeaoue i?iaeai n
ia?aaea/ae ia?ea?a – eieeecee. Noaiaea?o Token Ring /aoei ii?aaeaeyao iaoiaeu
?ac?aoaiey eieeecee:
Aaaeiie aeey ?ac?aoaiey eieeecee yaeyaony aiciiaeiinoue noaioeee “neooaoue” iinea
ia?aaea/e.
A neo/aa, anee noaioeey ia?aaeaao ia?ea? ninaaeiae, a oa a yoi a?aiy
ioeeth/aaony (iai?eia? ec-ca aiia?aoiiai naiy), oi anee ia iineaaeoao ia?aaea/
eaae?a eee ia?ea?a, oi ia?ea? iinueaaony aoi?e/ii.
Anee e i?e iiaoi?iie ia?aaea/a ia?ea?a ie/aai ia iineaaeiaaei, oi noaioeey
iinueaao WHO_FOLLOWS eaae?, aaea oeacai ia ioaa/athuee ninaae. Oaeaey yoio eaae?,
noaioeey, aeey eioi?ie ia ioaa/athuay noaioeey – i?aaeoanoaaiiee, oeao eaae?
SET_SUCCESSOR, e noaiiaeony iiaui ninaaeii. I?e yoii iaioaa/athuay noaioeey
eneeth/aaony ec eieueoea.
A neo/aa, anee inoaiiaeeanue ia oieueei neaaeothuay noaioeey, ii e neaaeothuay ca
iae – caioneaaony iiaay i?ioeaaeo?a, iinueeie eaae?a SOLICIT_SUCCESSOR_2. A iae
o/anoaoao i?ioeaaeo?a ?ac?aoaiey eiioeeeoia. I?e yoii ana eoi oi/ao
iiaeeeth/eoueny e eieueoeo iiaoo yoi naeaeaoue. Oaeoe/anee eieueoei
ia?aonoaiaaeeaaaony.
Ae?oaie aeae i?iaeai aicieeaao, eiaaea inoaiaaeeaaaony aea?aeaoaeue ia?ea?a e
ia?ea? en/acaao ec eieueoea. Yoa i?iaeaia ?aoaaony caioneii i?ioeaaeo?u
eieoeeaeecaoeee eieueoea. O eaaeaeie noaioeee anoue oaeia?, eioi?ue na?anuaaaony
eaaeaeue ?ac, eiaaea ia?ea? iiyaeyaony. Anee cia/aiea yoiai oaeia?a i?aauneo
iaeioi?ie ca?aiaa onoaiiaeaiiia cia/aiea (time out), oi noaioeey aaia?e?oao
eaae? CLAIM_TOKEN. I?e yoii caioneaaony aeai?eoi ia?aoiiai aeaie/iiai
n/ao/eea.
Anee ieacaeinue aeaa e aieaa ia?ea?ia ia oeia, noaioeey, aeaaeathuay ia?ea?ii,
oaeaeaa ia?aaea/o ia?ea?a ia oeia, na?anuaaao naie ia?ea?. Oae iiaoi?yaony aei
oao ii? iiea ia inoaiaony ?iaii iaeei ia?ea? a nenoaia.
Ia ana noaioeee a eieueoea ?aaiu. Iaeia ec noaioeee iaicia/aaony eae aeoeaiue
iiieoi?, /oi icia/aao aeiiieieoaeueioth ioaaonoaaiiinoue ii oi?aaeaieth eieueoeii.
Aeoeaiue iiieoi? inouanoaeyao oi?aaeaiea oaei-aooii a eieueoea, ii?iaeaeaao
iiaua ia?ea?u (anee iaiaoiaeeii), /oiau nio?aieoue ?aai/aa ninoiyiea, e
aaia?e?oao aeeaaiinoe/aneea eaae?u i?e ii?aaeaeaiiuo ianoiyoaeuenoaao. Aeoeaiue
iiieoi? auae?aaony, eiaaea eieueoei eieoeeaeece?oaony, e a yoii ea/anoaa iiaeao
aunooieoue ethaay noaioeey naoe. Aeai?eoi ii?aaeaeaiey aeoeaiiai iiieoi?a
neaaeothuee: i?e aeeth/aiee eee anee eaeay-oi noaioeee caiaoeo ionoonoaea
iiieoi?a, iia iinueaao CLAIM_TOKEN eaae?. Anee iia ia?aay, eoi iineae oaeie
eaae?, oi iia e noaiiaeony iiieoi?ii
Anee iiieoi? ioeacae ii eaeie-eeai i?e/eia, nouanoaoao iaoaieci, n iiiiuueth
eioi?iai ae?oaea noaioeee (?aca?aiua iiieoi?u) iiaoo aeiaiai?eoueny, eaeay ec
ieo aoaeao iiaui aeoeaiui iiieoi?ii. Iaeiie ec ooieoeee aeey eioi?uo neoaeeo
aeoeaiue iiieoi? yaeyaony oaeaeaiea ec eieueoea iinoiyiii oee?eoee?othueo aeieia
aeaiiuo. Anee ono?ienoai, ioi?aaeaoaa aeie aeaiiuo,
ioeacaei, oi yoio aeie iiaeao iinoiyiii oee?eoee?iaaoue ii eieueoeo. Yoi iiaeao
iiiaoaoue ae?oaei noaioeeyi ia?aaeaaaoue nianoaaiiua aeiee aeaiiuo e oaeoe/anee
aeiee?oao naoue. Aeoeaiue iiieoi? iiaeao auyaeyoue e oaeaeyoue oaeea aeiee e
aaia?e?iaaoue iiaue ia?ea?. Aaaeiie ooieoeeae iiieoi?a yaeyaony onoaiiaea
caaea?ee ia eieueoea, caaea?aeea aeieaeia auoue aeinoaoi/ia, aeey oiai, /oiau a eieueoea
oianoeeny 24-aeoiue ia?ea?.
Caacaeiia?aciay oiiieiaey naoe IBM Token Ring oaeaea niinianoaoao iiauoaieth
iauae iaaeaaeiinoe naoe. O.e. any eioi?iaoeey naoe Token Ring i?iniao?eaaony
aeoeaiuie MSAU, yoe ono?ienoaa iiaeii cai?ia?aiie?iaaoue oae, /oiau iie
i?iaa?yee iaee/ea i?iaeai e i?e iaiaoiaeeiinoe auai?i/ii oaeaeyee noaioeee ec
eieueoea.
Aeai?eoi Token Ring, iacuaaaiue “neaiaeece?othuei” (beaconing), auyaeyao e
iuoaaony ono?aieoue iaeioi?ua iaeni?aaiinoe naoe. Anee eaeay-ieaoaeue noaioeey
iaia?oaeeo na?ueacioth i?iaeaio a naoe (iai?eia? oaeoth, eae ia?ua eaaaey), iia
aunueaao neaiaeueiue aeie aeaiiuo. Neaiaeueiue aeie aeaiiuo oeacuaaao aeiiai
iaeni?aaiinoe, a eioi?ue aoiaeyo noaioeey, niiauathuay i iaeni?aaiinoe, aa
aeeaeaeoee aeoeaiue ninaae, iaoiaeyueeny auoa ii oa/aieth iioiea eioi?iaoeee
(NAUN), e ana, /oi iaoiaeeony iaaeaeo ieie. Neaiaeecaoeey eieoeeaeece?oao
i?ioeann, iacuaaaiue “aaoi?aeiioeao?aoeeae” (autoreconfiguration), a oiaea
eioi?iai oceu, ?aniieiaeaiiua a i?aaeaeao ioeacaaoaai aeiiaia, aaoiiaoe/anee
auiieiytho aeeaaiinoeeo, iuoaynue ?aeiioeao?e?iaaoue naoue aie?oa ioeacaaoae
ciiu. A oece/aneii ieaia MSAU iiaeao auiieieoue yoi n iiiiuueth yeaeo?e/aneie
?aeiioeao?aoeee.
I?AEOE*ANEAss *ANOUe
Ionoue o ian anoue naoue ec 50 noaioeee, ?aaioathuay ia nei?inoe 10 Iaeo/nae e
iano?iaiiay oae, /oi ia iiaenoaioeee n i?ei?eoaoii 6 inoaaony 1/3 i?iioneiie
niiniaiinoe. Oiaaea eaaeaeay noaioeey eiaao aa?aioe?iaaiii aeey i?ei?eoaoa 6
nei?inoue ia iaiaa 67 Ea/n. Yoa i?iioneiay niiniaiinoue iiaeao auoue
eniieueciaaia aeey oi?aaeaiey ono?ienoaaie a ?aaeueiii ianooaaa a?aiaie.
Aaaeiie i?iaeaiie i?e nicaeaiee eieueoeaaie naoe yaeyaony “oece/aneay aeeeia”
aeoa. Ionoue aeaiiua ia?aaeathony ni nei?inoueth R Mbps. Yoi cia/eo, /oi eaaeaeua
1/R ms ia eeiee iiyaeyaony aeo. O/eouaay, /oi neaiae ?ani?ino?aiyaony ni
nei?inoueth 200 m/ms, oi iaeei aeo caieiaao 200/R iao?ia eieueoea. Ionthaea, i?e
nei?inoe 1 Ibps e aeeeia ie?oaeiinoe 1 ei eieueoei aiauaao ia aieaa 5 aeo
iaeiia?aiaiii.
Neaaenoaeai eiino?oeoeee naoe eieueoei n ia?ea?ii yaeyaony o, /oi naoue aeieaeia
eiaoue aeinoaoi/ioth i?ioyaeaiiinoue, /oiau ia?ea? iiaoo oianoeoueny a iae oeaeeeii
aeaaea eiaaea ana noaioeee iaoiaeyony a iaeeaeaiee. Caaea?aeee neeaaeuaathony ec aeaoo
eiiiiiaioia – 1 aeo caaea?aeea ia eioa?oaena noaioeee e caaea?aeea ia
?ani?ino?aiaiea neaiaea. O/eouaay, /oi noaioeee iiaoo aueeth/aoueny, iai?eia?
ia ii/ue, neaaeoao /oi ia eieueoea aeieaeia auoue eneonnoaaiiay caaea?aeea, anee
eieueoei ia aeinoaoi/ii aeeeiiia. I?e iaeie caa?ocea noaioeee a naoe eieueoei n
ia?ea?ii n?aco niiaoo ia?aaeaaaoue naie niiauaiey. Ii ia?a ?inoa caa?ocee o
noaioeee aoaeoo ?anoe i/a?aaee ia ia?aaea/o e iie a niioaaonoaee n eieueoeaaui
aeai?eoiii aoaeoo caoaaouaaoue ia?ea? e aanoe ia?aaea/o. Iinoaiaiii caa?ocea
eieueoea aoaeao ?anoe iiea ia aeinoeaiao 100%.
oi?iao ia?ea?a
Eaae? ia?ea?a ninoieo ec o?ao iieae, eaaeaeia aeeeiie a iaeei aaeo.
C Iiea ia/aeueiiai ia?aie/eoaey iiyaeyaony a ia/aea ia?ea?a, a oaeaea a ia/aea
ethaiai eaae?a, i?ioiaeyuaai ii naoe. Iiea ninoieo ec oieeaeueiie na?ee
yeaeo?e/aneeo eiioeuenia, eioi?ua ioee/athony io oao eiioeuenia, eioi?uie
eiaee?othony aaeeieoeu e ioee a aaeoao aeaiiuo. Iiyoiio ia/aeueiue ia?aie/eoaeue
iaeuecy niooaoue ie n eaeie aeoiaie iineaaeiaaoaeueiinoueth.
C Iiea eiio?iey aeinooia. ?acaeaeyaony ia /aou?a yeaiaioa aeaiiuo:
PPP T M RRR,
aaea PPP – aeou i?ei?eoaoa, T – aeo ia?ea?a, M – aeo iiieoi?a, RRR –
?aca?aiua aeou.
Eaaeaeue eaae? eee ia?ea? eiaao i?ei?eoao, onoaiaaeeaaaiue aeoaie i?ei?eoaoa
(cia/aiea io 0 aei 7, 7 – iaeaunoee i?ei?eoao). Noaioeey iiaeao ainiieueciaaoueny
ia?ea?ii, anee oieueei iia iieo/eea ia?ea? n i?ei?eoaoii, iaiueoei eee ?aaiui,
/ai aa nianoaaiiue. Naoaaie aaeaioa? noaioeee, anee aio ia oaeaeinue caoaaoeoue
ia?ea?, iiiauaao naie i?ei?eoao a ?aca?aiua aeou ia?ea?a, ii oieueei a oii
neo/aa, anee caienaiiue a ?aca?aiuo aeoao i?ei?eoao ieaea aai nianoaaiiiai.
Yoa noaioeey aoaeao eiaoue i?aeiouanoaaiiue aeinooi i?e iineaaeothuai iinooieaiee
e iae ia?ea?a.
Aeo ia?ea?a eiaao cia/aiea 0 aeey ia?ea?a e 1 aeey eaae?a.
Aeo iiieoi?a onoaiaaeeaaaony a 1 aeoeaiui iiieoi?ii e a 0 ethaie ae?oaie
noaioeeae, ia?aaeathuae ia?ea? eee eaae?. Anee aeoeaiue iiieoi?
aeaeeo ia?ea? eee eaae?, niaea?aeauee aeo iiieoi?a a 1, oi aeoeaiue iiieoi?
ciaao, /oi yoio eaae? eee ia?ea? oaea iaeiaaeaeu iaioae eieueoei e ia aue ia?aaioai
noaioeeyie. Anee yoi eaae?, oi ii oaeaeyaony ec eieueoea. Anee yoi ia?ea?, oi
aeoeaiue iiieoi? ia?aienuaaao i?ei?eoao ec ?aca?aiuo aeoia iieo/aiiiai
ia?ea?a a iiea i?ei?eoaoa. Iiyoiio i?e neaaeothuai i?ioiaea ia?ea?a ii eieueoeo
aai caoaaoeo noaioeey, eiathuay iaeaunoee i?ei?eoao.
C Iiea eiia/iiai ia?aie/eoaey – iineaaeiaa iiea ia?ea?a. Oae aea, eae e iiea
ia/aeueiiai ia?aie/eoaey, yoi iiea niaea?aeeo oieeaeueioth na?eth yeaeo?e/aneeo
eiioeuenia, eioi?ua iaeuecy niooaoue n aeaiiuie. E?iia ioiaoee eiioea ia?ea?a yoi
iiea oaeaea niaea?aeeo aeaa iiaeiiey: aeo i?iiaaeooi/iiai eaae?a e aeo ioeaee. Yoe
iiey ioiinyony aieueoa e eaae?o aeaiiuo, eioi?ue iu e ?anniio?ei
Token ring e FDDI
Oaoiieiaey Fiber Distributed Data Interface (FDDI) – ia?aay oaoiieiaey
eieaeueiuo naoae, eioi?ay eniieueciaaea a ea/anoaa n?aaeu ia?aaea/e aeaiiuo
iioiaieieiiiue eaaaeue.
FDDI ii nouanoao i?aaenoaaeyao niaie auno?iaeaenoaothuee aa?eaio Token Ring ia
aieieiiiie iioeea. A ioee/aa io Token Ring FDDI ?aaeecoaony aac o?aaeeoeeiiiuo
eiioeaio?aoi?ia-“oaaia”. Aua iaeiei ioee/eai FDDI io Token Ring yaeyaony
aiciiaeiinoue ia?aaeaaaoue aeaiiua iaeiia?aiaiii, o.a. a naoyo FDDI iiaeao
iaeiia?aiaiii oee?eoee?iaaoue ianeieueei eaae?ia.
Ii naiae oiiieiaee FDDI ninoieo ec aeaoo eiae/aneeo eieaoe n oee?eoeyoeeae
ia?ea?ia ii iei a i?ioeaiiieiaeiuo iai?aaeaieyo. Eieueoea ia?acotho iniiaiie e
?aca?aiue iooe ia?aaea/e aeaiiuo iaaeaeo oceaie naoe. Eniieueciaaiea aeaoo eieaoe –
yoi iniiaiie niinia iiauoaiey ioeacionoie/eainoe a naoe FDDI, e oceu,
eioi?ua oioyo ei ainiieueciaaoueny, aeieaeiu auoue iiaeeeth/aiu e iaiei eieueoeai. A
ii?iaeueiii ?aaeeia ?aaiou naoe aeaiiua i?ioiaeyo /a?ac ana oceu e ana o/anoee
eaaaey ia?ae/iiai (Primary) eieueoea, iiyoiio yoio ?aaeei iacaai ?aaeeiii Thru –
“neaiciui” eee “o?aiceoiui”. Aoi?e/iia eieueoei (Secondary) a yoii ?aaeeia ia
eniieuecoaony. A neo/aa eaeiai-eeai aeaea ioeaca, eiaaea /anoue ia?ae/iiai
eieueoea ia iiaeao ia?aaeaaaoue aeaiiua (iai?eia?, ia?ua eaaaey eee ioeac ocea),
ia?ae/iia eieueoei iauaaeeiyaony ni aoi?e/iui
), ia?acoy aiiaue aaeeiia eieueoei. Yoio ?aaeei ?aaiou naoe iacuaaaony Wrap, oi
anoue “naa?ouaaiea” eee “nai?a/eaaiea” eieaoe. Iia?aoeey naa?ouaaiey
i?iecaiaeeony neeaie eiioeaio?aoi?ia e/eee naoaauo aaeaioa?ia FDDI. Aeey
oi?iuaiey yoie i?ioeaaeo?u aeaiiua ii ia?ae/iiio eieueoeo anaaaea ia?aaeathony
i?ioea /aniaie no?aeee, a ii aoi?e/iiio – ii /aniaie. Iiyoiio i?e
ia?aciaaiee iauaai eieueoea ec aeaoo eieaoe ia?aaeao/eee noaioeee ii-i?aaeiaio
inoathony iiaeeeth/aiiuie e i?eaiieeai ninaaeieo noaioeee, /oi iicaieyao
i?aaeeueii ia?aaeaaaoue e i?eieiaoue eioi?iaoeeth ninaaeieie noaioeeyie.
A FDDI aeinoeaaaony aeoiaay nei?inoue 100 Ia/n
I?ioeaaeo?a eieoeeaeecaoeee FDDI ianeieueei ioee/aaony io eieoeeaeecaoeee Token
Ring:
Aeey auiieiaiey i?ioeaaeo?u eieoeeaeecaoeee eaaeaeay noaioeey naoe aeieaeia ciaoue i
naieo o?aaiaaieyo e iaeneiaeueiiio a?aiaie iai?ioa oieaia ii eieueoeo. Yoe
o?aaiaaiey niaea?aeaony a ia?aiao?a, iacuaaaiii “o?aaoaiia a?aiy iai?ioa
oieaia” – TTRT (Target Token Rotation Time).
Ia?aiao? TTRT io?aaeaao noaiaiue iio?aaiinoe noaioeee a i?iioneiie niiniaiinoe
eieueoea – /ai iaiueoa a?aiy TTRT, oai /aua noaioeey aeaeaao iieo/aoue oieai aeey
ia?aaea/e naieo eaae?ia. I?ioeaaeo?a eieoeeaeecaoeee iicaieyao noaioeeyi ociaoue i
o?aaiaaieyo ei a?aiaie iai?ioa oieaia ae?oaeo noaioeee e aua?aoue ieieiaeueiia
a?aiy a ea/anoaa iauaai ia?aiao?a T_Opr, ia iniiaaiee eioi?iai a aeaeueiaeoai
aoaeao ?ani?aaeaeyoueny i?iioneiay niiniaiinoue eieueoea. Ia?aiao? TTRT aeieaeai
iaoiaeeoueny a i?aaeaeao io 4 in aei 165 in e iiaeao eciaiyoueny aaeieieno?aoi?ii
naoe.
Aeey i?iaaaeaiey i?ioeaaeo?u eieoeeaeecaoeee noaioeee iaiaieaathony neoaeaaiuie
eaae?aie IAN-o?iaiy – eaae?aie Claim. Yoe eaae?u eiatho a iiea oi?aaeaiey
cia/aiea 1L00 0011, iiea aae?ana iacia/aiey niaea?aeeo aae?an enoi/ieea (DA =
SA), a a iiea eioi?iaoeee niaea?aeeony 4-o aaeoiaia cia/aiea cai?aoeaaaiiai
a?aiaie iai?ioa oieaia T_Req.
Anee eaeay-eeai noaioeey ?aoaao ia/aoue i?ioeann eieoeeaeecaoeee eieueoea ii naiae
eieoeeaoeaa, oi iia oi?ie?oao eaae? Claim Token ni naiei cia/aieai o?aaoaiiai
a?aiaie iai?ioa oieaia TTRT, oi anoue i?enaaeaaao iieth T_Req naia cia/aiea
TTRT. Caoaaoa oieaia aeey ioi?aaee eaae?a Claim ia o?aaoaony. Ethaay ae?oaay
noaioeey, iieo/ea eaae? Claim Token, ia/eiaao auiieiyoue i?ioeann Claim Token.
I?e yoii noaioeee onoaiaaeeaatho i?eciae iaoiaeaeaiey eieueoea a ?aaioiniiniaiii
ninoiyiee Ring_Operational a ninoiyiea False, /oi icia/aao ioiaio ii?iaeueiuo
iia?aoeee ii ia?aaea/a oieaia e eaae?ia aeaiiuo. A yoii ninoiyiee noaioeee
iaiaieaathony oieueei neoaeaaiuie eaae?aie Claim.
Aeey auiieiaiey i?ioeaaeo?u eieoeeaeecaoeee eaaeaeay noaioeey iiaeaea?aeeaaao oaeia?
oaeouaai a?aiaie iai?ioa oieaia TRT (Token Rotation Timer), eioi?ue
eniieuecoaony oaeaea e a aeaeueiaeoai i?e ?aaioa eieueoea a ii?iaeueiii ?aaeeia. Aeey
oi?iuaiey eceiaeaiey aoaeai n/eoaoue, /oi yoio oaeia?, eae e ae?oaea oaeia?u
noaioeee, eieoeeaeece?oaony ioeaaui cia/aieai e caoai ia?aueaaao naia cia/aiea
aei ii?aaeaeaiiie aaee/eiu, iacuaaaiie ii?iaii enoa/aiey oaeia?a. (A ?aaeueiii
eieueoea FDDI ana oaeia?u ?aaioatho a aeaie/iii aeiiieieoaeueiii eiaea).
Oaeia? TRT caioneaaony eaaeaeie noaioeeae i?e iaia?oaeaiee iiiaioa ia/aea
i?ioeaaeo?u Claim Token. A ea/anoaa i?aaeaeueiiai cia/aiey oaeia?a auae?aaony
iaeneiaeueii aeiionoeiia a?aiy iai?ioa oieaia, oi anoue 165 in. Enoa/aiea
oaeia?a TRT aei caaa?oaiey i?ioeaaeo?u icia/aao aa iaoaea/iia ieii/aiea – eieueoei
ia oaeaeinue eieoeeaeece?iaaoue. A neo/aa iaoaea/e i?ioeanna Claim Token
caioneaaony i?ioeannu Beacon e Trace, n iiiiuueth eioi?uo noaioeee eieueoea
iuoathony auyaeoue iaei??aeoii ?aaioathuoth /anoue eieueoea e ioeeth/eoue aa io naoe.
Ai a?aiy auiieiaiey i?ioeanna Claim Token eaaeaeay noaioeey nia/aea iiaeao
ioi?aaeoue ii eieueoeo eaae? Claim ni cia/aieai T_Req, ?aaiui cia/aieth aa
ia?aiao?a TTRT. I?e yoii iia onoaiaaeeaaao cia/aiea T_Opr, ?aaiia cia/aieth
TTRT. ?anniio?ei i?eia? eieoeeaeece?oaiiai eieueoea, i?eaaaeaiiue ia ?enoiea 9.
A iaeioi?ue iiiaio a?aiaie ana noaioeee ia?aaeaee ii eieueoeo naie i?aaeeiaeaiey i
cia/aiee iaeneiaeueiiai a?aiaie iai?ioa oieaia: 72 in, 37 in, 51 in e 65 in.
Noaioeey, i?eiya eaae? Claim io i?aaeuaeouae noaioeee, iaycaia n?aaieoue cia/aiea
T_Req, oeacaiiia a eaae?a ni cia/aieai TTRT naiaai i?aaeeiaeaiey.
Anee ae?oaay noaioeey i?ineo onoaiiaeoue a?aiy iai?ioa oieaia iaiueoa, /ai
aeaiiay (oi anoue T_Req
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