Symmetricom SyncServer S100 User Manual page 28

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AVERTISSEMENT AVER TISSEMENT : : La La posit
Ell Elles es ne ne so sont nt pa pas s pré
vie-ou-mort). vie-ou-mort).
STATUS - NTP STATUS - NTP
NT NTP P Daem Da
This is pa page ge di disp spla lays ys th the e st stat atus us of of th the e NTP Th
NTP Packet NTP Packet
system peer : : Th
system peer
mo mon n tha that t is is mo
persi sion on and per and co conf nfid iden ence ce in inter
Syn SyncSe cServe rver r Hard
system peer mode : : The
system peer mode
Depend Dep endin ing g th the e co conf nfig igura
Client: A A host
Client:
n n
ab abil ilit ity y st stat ate e or or s s tr trat atum
st stati ation, on, a a nno
Symmetric Active: A A host
Symmetric Active:
n n
of of th the e re reac acha habi bili lity ty st stat ate e or or s s tr trat atum
ann announc ounces es its its will
Symmetric Passive: Thi
Symmetric Passive:
n n
s s ag age e fr from
pe peer er is is re reac acha habl ble e an and d op oper erat atin ing g at at a a st stra ratu tum m le leve vel l le less ss th than an or or eq equa ual l to to th the e ho host st; ; ot othe her- r-
wis wise, e, th the e as asso soci ciat atio ion n is is di diss ssol olve ved. d. Howe
le leas ast t on one e me
it its s wil willi ling ngnes
A A host host operatin operating g in in clie
sa sage ge to to a a ho host st op opera
at at peri periodi odic c int interv
ports ts, , fi fill llin ing g in in the por
need d ret nee retai ain n no no st stat ate e in info forma
int interva ervals ls bet between
In In the the sy symm mmetri
mode de is is in inte tend nded ed fo for r us use e by by ti time mo
th the e sy sync nchro hroni niza zati tion on su subn bnet et and
ba bas s is is. . In In th this is mo
ci ciati ation on wit with h it its s st state
th the e st stat ate e st stor orag age e ca can n be be re reus used ed whe
hig higher her str stratum
Sym Symme metri tric c ac acti tive ve mo
(hig (highes hest t st stratum
Page e 16 16 .......................................................................... Pag
rface e
position ion et et l'altitu
prévu vues es po pour ur la la nav navig igati ation on ou ou d'a
emon onSta Status tus
(o (on n pa page ge 12 129) 9). . Al Also so s s ee ee
The e IP IP ad addr dres ess s of of th the e c c lo lock ck so sour urce ce. . Th
most st li like kely ly to to pro provi vide de th the e be best st ti timi ming ng in info forma
terva val. l. The The sy syst stem
Hardware ware Clo Clock ck. . Als Also o se see e
The rel relati ations onshi hip p of of th the e Syn
urati tion on, , th the e mo mode de ca can n be be: :
host operating operating in in this this mode
um of of it its s pe peer er. . By
nnounc unces es it its s wil willi lingn ngnes ess s to to be be sy sync nchro
host operating operating in in this
um of of it its s pe peer er. . By
willing ingnes ness s to to sy synch nchroni
This s ty type pe of of as asso soci ciat atio ion n is is ord
om a a pe peer er op oper erat atin ing g in in th the e sy symm
mess ssag age e ha has s be been en s s en ent t in in re repl ply. y. By
ness s to to sy sync nchro hroni nize ze and and be be sy sync nchro
client nt mode mode (a (a workstati workstation,
erati ting ng in in se serv rver er mo mode de (th
ervals als there thereaft after. er. The The se server
the req requi uired red ti time me in info forma
rmati tion on be betwee
ween sen sendin ding g NTP NTP mes messag
etric c mod modes, es, the the cli client/ ent/serv
me s s er erve vers rs op oper erat atin ing g ne near ar th the e ro root ot no node des s (l (lowe
and wit with h a a rel relat ativ ivel ely y la large
mode de th the e id iden enti tity ty of of th the e pe peer er ne need ed no not t be be k k no nown
ate va varia riabl bles es is is cr creat eated ed on only ly whe
when n th the e pe peer er be beco come
atum lev level el and and thu thus s ine inelig ligibl ible e as as a a sy synch
mode de is is in inte tende nded d fo for r us use e by by ti time
ratum) ) of of the the sy synch nchroni ronizat zation
..........................................................................99 997-0
l'altitude de de de GPS GPS sont sont seule seulement
d'aut utres res si situ tuat atio ions ns cr crit itiq ique ues s (si (situ tuati ations
NTP da daem emon on. . Ma Many ny of of th the e fi fiel elds ds be belo low w ar are e ba bas s ed ed on on th the e
. .
http://www.ntp.org http://www.ntp.org
The e so sour urce ce is is se sele lect cted ed by by th the e NTP
rmati tion on bas
em pe peer er id ident entif ifie ied d as as "SYM
(o (on n pa page ge 12 128) 8). .
Hardware Clock Hardware Clock
SyncSe cServe rver r to to a a sy syst stem
mode sends sends periodic periodic mess messages
By op oper erat atin ing g in in th this is mo mode de th the e ho hos s t, t, us usua uall lly y a a LA
hroni nize zed d by by, , but
this mode mode sends sends periodic
By op oper erat atin ing g in in th this is mo
ronize ze a a nd nd be be sy sync nchro hroni nize zed d by by th the e pee
ordin inari arily ly cre
mmet etri ric c ac acti tive ve mo mode de an and d pe pers rsis ists ts on only ly as as lo long ng as as th the e
Howeve ver, r, th the e as asso soci ciat atio ion n wil
By op oper erat atin ing g in in th this is mo
hroni nize zed d by by th the e pe peer.
on, for for exam example) ple) occ
(the e Syn SyncSe cServe rver), r), pe perha
rver resp responds onds by by sim simply ply int interch
rmati tion on an and d ret return urnin ing g th the e me
tween n cl clie ient nt req reque uest sts, s, whi while le cl clie ients
sages es to to sui suit t loc local al con condit dition
server er dis distin tincti ction on (alm (almost ost) ) dis
rge nu numb mber er of of pee
wn in in ad adva vanc nce, e, si sinc nce e th the e as asso so- -
when n an an NTP NTP me mess ssage
mes s un unre reac acha habl ble e or or is is op oper erat atin ing g at at a a
nchroni ronizat zation ion sou
me se serv rvers ers ope operat
ion sub subnet. net. Reli Reliabl able e tim time e serv
ment pour pour la la sync synchroniz hronization.
ons de de la la
NTP da dae- e-
based ed on: on: st strat ratum um, , di dist stan ance ce, , di dis- s-
"SYMM_ M_TE(0 TE(0)" )" is is th the e lo loca cal l
em pee peer, r, us usua uall lly y a a "c "cli lient
ages regardles regardless s of of the the reach- reach-
LAN N wor
but not not to to sy sync nchro hroni nize ze th the e pee
periodic mess messages ages regardles regardless s
mode de th the e ho hos s t t
peer. r.
creat ated ed upo upon n arr arriv ival al of of a a me
will l al alway ways s pe pers rsis ist t unt until il at at
mode de th the e ho host st an anno noun unce ces s
er.
occasion asionally ally sends sends an an NTP NTP mes-
rhaps ps rig right ht aft after er reb reboot ootin ing g and
erchang anging ing addr address esses es and
mess ssag age e to to th the e cl clie ient nt. . Serv Servers
nts are are fre free e to to ma mana nage ge th the e
ions. s.
disappe appears ars. . Sym Symmet metric ric pas
owest st st stra ratu tum)
peers rs on on an an in inte termi rmitt tten ent t
age arr arriv ives es. . Fur Furth therm ermore
source. rce.
ratin ing g ne near ar the the en end d no nodes des
service ice can can usu usuall ally y be be
7-0152 1520-0 0-03 3 Rev Rev. . A A
ation.
ent". ".
work- k-
peer. r.
mes- s-
mes-
and
and
ers
passiv sive e
m) of of
ore, ,