Symmetricom SyncServer S100 User Manual page 123

Pag Page e 11 110 0 ..........................................................................
Notes: Notes:
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CAUTION: Switching between GPS and UTC references while CAUTION: Switching between GPS and UTC references while Ignore UTC Corrections
from from GPS
metricom recommends disabling and removing all UTC-synchronized Hardware Clock Input metricom recommends disabling and removing all UTC-synchronized Hardware Clock Input
References and NTP References
Distrib Distributing Non-UTC
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While le co confi nfigur Whi gured ed to to di dist strib ribute
sta status tus or or perf perform orm lea leap p sec second
Reg Regar ardl dles ess s of of th the e ti time me zo zone ne s s et etti ting ng, , G G PS
play. play.
GPS Refer Reference ence is enabled may have undesirable effects and should be avoided. Sym- is enabled may have undesirable effects and should be avoided. Sym-
and NTP associatio associations to
uting Non-UTC
Sync ncSer Serve ver r an and d NTP NTP ar are e in inte tend nded ed to to op oper erat ate e wit
er, if if req requi uired red, , th the e Syn SyncSe cServe
provi vides des so some me us usef eful ul poi
ributin ting g non- non-UTC UTC tim time e can can be be acc
Con Confi figu gurin ring g th the e Syn SyncSe cServ rver er to to di dist strib ribut ute e GPS
Ma Manu nual ally ly Set Setti ting ng th the e Ti Time me to to non
Sync Synchron hroniz izing ing to to non- non-UTC UTC NTP.
erally, ly, the the use user r sho should uld: :
Be Be awa aware re th that at us usin ing g non non-UTC
impact imp act upo upon n sy syst stems ems. .
Perf Perform orm ex exte tens nsiv ive e te test stin ing, g, an and d tak
implementi imple menting ng non-UTC time. non-UTC time.
Dis Distri tribut bute e no non-UT n-UTC NT C NTP P onl
Avo Avoid id di dist strib ribut utin ing g non non-UTC -UTC NTP
UTC time. UTC time.
Exerc Exercis ise e goo good d sec securit urity y prac practic tices es to to prev
Avoi Avoid d broa broadca dcasti sting ng and and mul
Use Use auth authenti enticat cation ion to to exc exclud
ributing GPS Time Time
Distributing GPS Time Distributing GPS Time
Setting the Ti ing the Time to me to non-U
Setting the Time Manually Setting the Time Manually
time" e" with with "no "non-U n-UTC TC time". time".
On th the e
TI TIMI MING NG - HW - HW Cl Clock ock
ton. ton.
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roles: roles: , , , ,
server server peer r pee broadcastclient broadcastclient
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server server peer peer
ute GPS GPS ti time me, , the the Syn SyncSe
ond adj adjust ustmen ments. ts.
PS ti time me is is re refl flec ecte ted d by by th the e se seco cond nds s in in th the e ti time
ns to preven prevent t thi this s from happ from happenin
Time Time
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pointe nters rs an and d ti tips ps for for do doin ing g th this is. .
accomp omplis lished hed by by se severa
GPS ti time me. .
non-UTC -UTC Ti Time me
NTP.
-UTC ti time me, , or or swi switc tchi hing ng be betwe
take e ex extra tra me meas asure ures s to to pro
only y on on pri priva vate te or or cl clos osed ed net
NTP on on ope open n or or pu publ blic ic ne networ
prevent ent thi this s cap capabi
multic ticast asting ing non non-UTC -UTC NTP. NTP.
lude e UTC-bas UTC-based ed NTP NTP cl clien
(o (on n pa page ge 10 109) 9). .
non-UTC Time TC Time
(on pa page ge 108 (on 108) ) top
pa page, ge, di disa sabl ble e al all l of of the the Inp Input ut Ref
delete ete UTC-b UTC-bas ased ed NTP NTP as asso soci ciat atio ions ns th that at ha have ve th the e fo foll llowi
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multicastclient multicastclient
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7-0152 1520-0 0-03 3 Rev Rev. . A A
Dis Distributi tributing ng Non-UTC Time
cServ rver er do does es not not rep report ort
Leap Indi Leap
Ignore UTC Corrections
ening. g.
UTC as as it its s st stan anda dard rd ti time
operat rate e wit with h ot other her ti time me sc scal ales es. . Thi
veral l met methods hods: :
tween en ti time me sc scal ales es, , ca can n hav
protec tect t da data ta and and sy syst stem
network works. s.
tworks ks, , or or to to sy syst stem ems s th that at ex expe pect ct
abilit lity y from from bein being g mi misus sused.
ients. ts.
topic ic. . Whi While le rea readi ding ng th the e tex text, t, su subs bsti titu tute te
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associations. associations.
multicastclient multicastclient
Non-UTC Time
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