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G.Lite (Splitterless ADSL) Siemens

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Contents

TI2322EU02TI_001

1 G.Lite (Splitterless ADSL)

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Siemens G.Lite (Splitterless ADSL)

1 Inroduction

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G.Lite is the Splitterless versi n ! As"mmetri# Di$it%l S&'s#ri'er Line. Th&sG.Lite is #%lle Splitterless ADSL. It is %n ITU*T G.++2.2 st%n %r . Splitterless isn t the nl" i!!eren#e 'et,een the G.Lite %n the !&ll r%te ADSL. There %re %lsi!!eren#es in spee # mple-it" tr%nsp rt pr t # ls &se %n ! # &rse # st.

G.Lite benefits Sin#e l , # st G.Lite is % $re%t 'ene!it t servi#e pr vi ers %n #&st mers.

This me%ns in#re%sin$ the n&m'er ! #&st mers &sin$ the te#hn l $". %st en &$h ! r Internet %##ess # mp%re ,ith / %n 2 . m ems.

E%s" t inst%ll.

Splitterless n # st ! r splitters %n re4&ires n #h%n$e t e-istin$ in*h me,irin$.

5 mp%ti'ilit" ,ith e-istin$ 65s

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i$. 1

i$. 2

TI2322EU02TI_0014

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TI2322EU02TI_0015

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2 G.Lite System Reference Model

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The ATU*5 DLL %n ATU*7 represent the G.Lite A##ess net, r ,hi#h # nne#tsthe 5&st mer E4&ipment t the # re net, r (8%rr ,'%n r 9r % '%n ).

Model description ATU*5 the Splitterless ADSL Tr%ns#eiver Unit (m em) %t the 5entr%l :!!i#e

ATU*7 the Splitterless ADSL Tr%ns#eiver Unit (m em) %t the 7em te en

Splitter*5 the Splitter %t the 5entr%l !!i#e en

L*p ( pti n%l) the pti n%l l , p%ss !ilter # nne#te t #&st mers teleph ne

U*5 the L p Inter!%#e*5entr%l :!!i#e en

U*7 the L p Inter!%#e*7em te Termin%l en S; the Servi#e ; &le ,hi#h #%n 'e % 65 % r &ter r % %t% s,it#h

TI2322EU02TI_0017

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i$. 3

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2.1 AT Reference ModelThe ATU m el is ivi e int 2 l%"ers

Tr%nsmissi n 5 nver$en#e (T5) l%"er.

6h"si#%l me i&m Depen ent (6;D) l%"er.

i$. 3 is % 'l # i%$r%m ! %n ADSL Tr%ns#eiver Unit (ATU) tr%nsmitter sh ,in$ the!&n#ti n%l 'l # s %n inter!%#es.

NOTE

:&tsi e the AS0

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i$. =

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i$. /

2.2 Differences !et"een G.Lite #nd ADSL AT s

!e"t#re !#ll r"te $%&L G.Lite

Tr"nsport protocols ST; > AT; AT; nl"

%"t" p"t' %st > Interle%ve :nl" Interle%ve

%o(nstre") c'"nnels :pti n%l m re th%n ne,nstre%m AS0?AS3:nl" ne 'e%rer #h%nnel AS0

s

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%#ple* c'"nnels :pti n%l m re th%n ne&ple- #h%nnels LS0?LS2

:nl" ne 'e%rer #h%nnelLS0&s

NOTE

The ADSL e4&ipment sh%ll s&pp rt 'e%rer #h%nnel AS0 ,nstre%m %n 'e%rer#h%nnel LS0 &pstre%m.

2.$ T%S&TC 'unction#lities

2.$.1 Idle Cell Insertion

I le #ells sh%ll 'e inserte in the tr%nsmit ire#ti n ! r #ell r%te e*# &plin$. I le #ells,ill 'e is#%r e '" %n ATU re#eiver.

2.$.2 e#der rror Control ( C) Gener#tion

The @E5 '"te is $ener%te in the tr%nsmit ire#ti n '" m &l 2 % iti n ( :7) !the p%ttern 'in%r" 01010101' t the @E5 'its.

2.$.$ Cell p#ylo#d scr#m!lin*

S#r%m'lin$ ! the #ell p%"l % !iel is &se in the tr%nsmit ire#ti n t impr ve these#&rit" %n stren$th ! the @E5 #ell eline%ti n me#h%nism. Usin$ - =3B1 p l"n mi%l.The #ell p%"l % is es#r%m'le '" %n ATU re#eiver.

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i$.

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2.$.+ ,it timin* #nd orderin*

Chen inter!%#in$ AT; %t% '"tes t the AS0

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i$.

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TI2322EU02TI_00116

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$ 'r#min*

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The !r%min$ is e4&iv%lent t the re e verhe% m e ,ith mer$e !%st %n s"n#'"tes %s e!ine in ADSL ITU*T G.++2.1 &sin$ nl" the interle%ve '&!!er e!initi n.

:nl" % sin$le &ple- #h%nnel is s&pp rte # nsistin$ ! % simple- AS0 ,nstre%m#h%nnel %n % simple- LS0 &pstre%m #h%nnel.

$.1 Super 'r#me StructureG.Lite &ses s&per !r%me strt&re sh ,n in i$. . The ATU sen s % s&per!r%meever" 1 mse#. E%#h s&per!r%me is # mp se ! D%t% r%mes (D ) ,hi#h %reen# e %n m &l%te int D;T s"m' ls ! ll ,e '" % S"n# r%me (S ).

The S #%rries n &ser r verhe% 'it*level %t% %n is inserte '" the m &l%t r test%'lish s&per!r%me ' &n %ries.

The D;T s"m' l r%te is =000 '%& (peri F 0.2/ ms) '&t in r er t %ll , ! r theinserti n ! the S the tr%nsmitte D;T s"m' l r%te is ( +< ) - =000.

$.1.1 'or"#rd rror Correction

The E5 en# er t% es in S ;U D%t% r%mes %n %ppen s 7 7ee *S l m n E5re &n %n#" '"tes. The E5 :&tp&t D%t% r%mes sh%ll # nt%in B (7

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i$.

TI2322EU02TI_00119

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$.1.2 Sync ,yte

The #r# In i#%t r 9its e # %n % # !&n#ti ns sh%ll 'e #%rrie in the S9 %ssi$ne tsep%r%te D s ,ithin the s&per!r%me strt&re.

The #r# is tr%nsmitte in !r%me 0 %n the In i#%t r 9its in !r%mes 1 3= %n 3/. The% # %n e # '"tes %re %ssi$ne t %ltern%te p%irs ! !r%mes.

$.1.2.1 Cyclic Redund#ncy C0ec (CRC)

'its per s&per !r%me sh%ll 'e &se ! r the #r# n the s&per !r%me (#r#0*#r# ). TheS"n# 9"te (S9) #%rries the #r# #he# 'its ! r the previ &s s&per !r%me in !r%me 0.

$.1.2.2 Indic#tor ,its (I, &I,2$)

The S9 #%rries In i#%t r 9its in D%t% r%mes 1 3= %n 3/. The in i#%t r 'its %re&se ! r :A; !&n#ti ns.

$.1.2.$ eoc !yte encodin*

The e # 'its tr%nsp rte in the S9 sh%ll # nt%in either e # 'its r the he-% e#im%lv%l&e ! 0011 0 ' in ,nstre%m %n 000011 0 ' in &pstre%m (,ith ven rpti n%l) in i#%tin$ n s"n#hr niH%ti n %#ti n .

The n s"n#hr niH%ti n %#ti n '"te sh%ll 'e &se %s !ill ,hen there is n e ##h%nnel %t% t 'e tr%nsmitte . Chen tr%nsp rtin$ e # %t% the S9 e # '"tes sh%ll'e en# e %s in i$. +.

In %ll !r%mes 'it is ;S9 %n 'it 0 is LS9. 9it 0 sh%ll 'e set t 1 ' t in i#%te th%t thee # '"te # nt%ins %n e # mess%$e. 9it r1 sh%ll 'e set t 1 ' . The &se ! r1 is reserve'" the ITU*T.

$.1.2.+ #oc !yte encodin*

The % # '"tes tr%nsp rte in the S9 sh%ll # nt%in the % # #h%nnel %t%. Chen n

% # %t% is %v%il%'le ! r tr%nsmissi n in the s&per !r%me the % # '"te sh%ll # nt%inthe st&!!in$ '"te %ll 0s. In %ll !r%mes 'it is ;S9 %n 'it 0 is LS9.

TI2322EU02TI_0012

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i$. +

i$. 10

TI2322EU02TI_00121

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TI2322EU02TI_00122

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+ Tec0nic#l Aspects

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+.1 R#te #nd Re#c0The G.Lite r%te is e!ine %s th%t ! the 'e%rer #h%nnel. 9e%rer #h%nnel AS0 sh%lls&pp rt the tr%nsp rt ! %t% %t %ll inte$er m&ltiples ! 32 'ps !r m = 'ps t 1./3;'ps. 9e%rer #h%nnel LS0 sh%ll s&pp rt %ll inte$er m&ltiples ! 32 'ps !r m 32 'pst /12 'ps.

Depen in$ n the spee G.Lite #%n re%#h !r m 3 &p t m ver % 0./ mm # pper,ire.

+.2 DMT Line ncodin*G.Lite &ses the s%me line # in$ te#hni4&e %s !&ll r%te ADSL '&t the n&m'er ! s&'*#h%nnels is less th%n th%t ! r !&ll r%te ADSL (12 in G.Lite 2/ in ADSL).

Th&s the !re4&en#" spe#tr&m ! the G.Lite is n%rr , # mp%re ,ith !&ll r%te ADSLspe#tr&m ( //0 @H G.Lite 1.1 ;@H !&ll r%te ADSL).

TI2322EU02TI_00124

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i$. 11

i$. 12

TI2322EU02TI_00125

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+.$ G.Lite Tec0nic#l C0#llen*es #nd Solutions+.$.1 Tec0nic#l %ro!lems

Step !&n#ti ns #h%n$es in l % impe %n#e #%&se '" teleph nes $ in$ n*%n !!*h .

J i#e h%rm ni#s %!!e#tin$ the ,nstre%m re#eive si$n%l.

8 ise (m stl" imp&lse) in e n the h me ,irin$ '" h me e4&ipment

+'"t cre"tes t'e proble)s

It is the sh%rin$ ! the teleph ne %n ADSL si$n%ls n the s%me in*h &se ,irin$ th%t#re%tes the $re%test p tenti%l ! r i!!i#&lt" ,ith G.Lite.

%escribin, t'e -roble)s

The impe %n#e ! % teleph ne ,hen !!*h m%" 'e s l , th%t it essenti%ll" sh&ntsthe stren$th ! the ADSL si$n%l.

S me h%n sets %re n n*line%r %n # nvert v i#e si$n%ls t % m &l%te hi$h*'%nsi$n%l th%t res&lts in inter!eren#e n the m em. The pp site #%n h%ppen %s ,ell%n ADSL si$n%l #%n 'e he%r %s %nn "in$ s &n s in the teleph ne.In % iti n n ise $ener%te !r m % teleph ne in the s%me !re4&en#" r%n$e %s the

ADSL si$n%l #%n 'e isr&ptive t the ADSL si$n%l.

TI2322EU02TI_00126

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i$. 13

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+.$.2 Solution

A simple s l&ti n is t inst%ll %n in*line mi#r *!ilter (l ,*p%ss !ilter) 'et,een the ,%ll K%# %n the teleph ne th&s elimin%tin$ the ist&r'%n#e pr 'lem.

Sh % !ilter is ine-pensive %n #%n 'e e%sil" inst%lle '" the #&st mer. A mi#r *!ilter

,ill 'e inst%lle ! r ever" teleph ne set %t h me

TI2322EU02TI_00128

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i$. 1=

TI2322EU02TI_00129

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i$. 1/

TI2322EU02TI_0013

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-.1 eoc C0#nnelThe e # #h%nnel is % sep%r%te #h%nnel sent ,ithin the G.Lite !r%me t per! rm :A;!&n#ti ns. The 13 'its ! %n e # mess%$e %re p%rtiti ne int !ive !iel s

-.1.1 ADDR SS 'ield

The t, 'its ! the ADD7ESS !iel #%n % ress &p t ! &r l #%ti ns.

TI2322EU02TI_00132

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NOTE&

The ATU*5 sh%ll % ress mess%$es t the ATU*7 '" settin$ the ADD7ESS!iel e4&%l t the ATU*7 % ress.

Chen resp n in$ t %n e # mess%$e !r m the ATU*5 the ATU*7 sh%ll eepthe ADD7ESS !iel e4&%l t its ,n ATU*7 % ress.

:nl" ,hen sen in$ %n %&t n m &s mess%$e t the ATU*5 sh%ll the ATU*7set the ADD7ESS !iel e4&%l t the ATU*5 % ress.

-.1.2 D#t# or 3pcode field

0 ' in this !iel in i#%tes th%t the I8 :7;ATI:8 !iel ! the #&rrent e # mess%$e# nt%ins % %t% '"te. 1 ' in i#%tes th%t it # nt%ins %n per%ti n # e ! r %n e #mess%$e.

-.1.$ ,4T %ARIT4 field

Chen &sin$ the 8e-t 9"te p# e t re% r ,rite the !irst %t% '"te ! %n e #re$ister this 'it sh%ll 'e set t 1 ' t in i#%te '"te. r the ne-t '"te it sh%ll 'eset t 0 ' t in i#%te even '"te %n s n %ltern%tel".

i$. 1

TI2322EU02TI_00133

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i$. 1

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-.1.+ A T353M3 S M SSAG fieldThe ATU*5

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i$. 1+

-.2.2 '#r&end ,loc rror (fe!e&i) #nom#ly

A !e'e*i %n m%l" is % #r#*i %n m%l" ete#te %t the !%r*en %n is rep rte n#e pers&per !r%me '" the !e'e*i in i#%t r 'it. The !e'e*i in i#%t r sh%ll 'e set t 1 ' tin i#%te th%t n #r#*i %n m%l" is present in the previ &s s&per !r%me %n sh%ll 'e sett 0 ' t in i#%te th%t % #r#*i %n m%l" is present in the previ &s s&per !r%me.

-.2.$ '#r&end Loss of si*n#l (los) :

A !%r*en l s e!e#t is % l s e!e#t ete#te %t the !%r*en %n is rep rte '" the l sin i#%t r 'it.

The l s in i#%t r 'it sh%ll 'e set t 1 ' t in i#%te th%t n l s e!e#t is 'ein$ rep rte%n sh%ll 'e set t 0 ' ! r si- # nse#&tive s&per!r%mes t in i#%te th%t % l s e!e#t is

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'ein$ rep rte . A !%r*en l s e!e#t termin%tes ,hen ! &r r m re &t ! si-

# nti$& &sl" re#eive l s in i#%t rs %re # e %s 1 ' .

-.2.+ '#r&end Remote defect indic#tion (rdi)6

An r i e!e#t is % se! (severe err r !r%me) e!e#t ete#te %t the !%r*en %n isrep rte n#e per s&per!r%me '" the r i in i#%t r 'it.

The r i in i#%t r 'it sh%ll 'e set t 1 ' t in i#%te th%t n se! e!e#t is present in theprevi &s s&per!r%me %n sh%ll 'e set t 0 ' t in i#%te th%t % se! e!e#t is present inthe previ &s s&per!r%me. An r i e!e#t termin%tes ,hen % re#eive r i in i#%t r is# e %s 1 ' .

-.2.- '#r&end 5o Cell Deline#tion (fncd&i) #nom#ly

An !n# *i %n m%l" is %n n# *i %n m%l" ete#te %t the !%r*en %n is rep rte n#eper s&per!r%me '" the n# *i in i#%t r 'it. An n# *i %n m%l" ##&rs ,hen AT; %t%%re %ll #%te t the %t% '&!!er %n %s l n$ %s the #ell eline%ti n pr #ess per%tin$n this %t% is in the @U8T r 67ES 85 st%te.

-.2. '#r&end e#der rror C0ec (f0ec&i) #nom#ly6

An !he#*i %n m%l" is %n he#*i %n m%l" ete#te %t the !%r*en %n is rep rte n#eper s&per!r%me '" the he#*i in i#%t r. An he#*i %n m%l" ##&rs ,hen %n AT; #ellhe% er err r #he# !%ils n the interle%ve %t%.

The he#*i in i#%t r sh%ll 'e set t 1 ' t in i#%te th%t n he#*i %n m%l" is present inthe previ &s s&per !r%me %n sh%ll 'e set t 0 ' t in i#%te th%t %t le%st ne he#*i%n m%l" is present in the previ &s s&per !r%me.

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ATU*- ATU*-

5755he#

S&per .r%me

E..O. NO

E..O.

8e-t :&t$ in$S&per .r%me

!e'e*i F 0

!e'e*i F 1

i$. 20

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ATU*- ATU*-

AT;5ell@E5

S&per .r%me

E..O. NO

E..O.

8e-t :&t$ in$S&per .r%me

he#*i F 0

he#*i F 1

i$. 21

-.$ ADSL 3/er0e#d Control C0#nnel (A3C)32 '"tes %re %ll #%te per s&per !r%me ! r tr%nsmissi n ! % # %t%. The % # #h%nnelis &se ! r 'it*s,%ppin$ %n !%st retr%in pr !ile m%n%$ement.

-.$.1 ,it s"#ppin*

The 'it s,%p pr #ess &ses the % # #h%nnel. All 'it s,%p mess%$es sh%ll 'e repe%te!ive # nse#&tive times ver the % # #h%nnel.

9it s,%ppin$ en%'les %n ADSL s"stem t #h%n$e the n&m'er ! 'its %ssi$ne t %s&'*#%rrier r #h%n$e the tr%nsmit ener$" ! % s&'*#%rrier ,ith &t interr&ptin$ %t%!l ,.

-.$.2 '#st retr#in

%st retr%in %ll ,s the ATU tr%ns#eivers t 4&i# l" #h%n$e tr%nsmissi n#h%r%#teristi#s &rin$ #h%n$in$ line # n iti ns.

-.$.$ A3C Mess#*e ncodin*

An % # mess%$e # nsists ! %n % # he% er %n %n % # mess%$e !iel .

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-.$.$.1 7#mples for #oc mess#*es

-rofile M"n",e)ent e/#est

The 6r !ile ;%n%$ement 7e4&est mess%$e is sent '" the ATU*7 ( r ATU*5) tre4&est the ATU*5 ( r ATU*7) t s%ve the #&rrent settin$s in % pr !ile. All ,ev%l&es ! r """" ' %re !r m 0000 ' t 1111 ' # rresp n in$ t pr !ile 0 %n pr !ile 1/respe#tivel".

The pr !iles sh%ll %t le%st # nt%in the ! ll ,in$ in! rm%ti n

M E5 p%r%meters 7 %n S

M Interle%ver epth D

0it s("p re/#est )ess",e encodin,

This mess%$e tells the tr%nsmitter ,hi#h s&'*#%rriers %re t 'e m i!ie .

The re4&est # nsists ! nine '"tes An % # mess%$e he% er # nsistin$ ! ei$ht 'in%r" nes

;ess%$e !iel s 1*= e%#h ! ,hi#h e%#h # nsists ! %n ei$ht*'it # mm%n! ll ,e '" % rel%te ei$ht*'it s&'*#%rrier in e-

i$. 22

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i$. 23

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Solution

Title6 Des#ri'in$ the G.Lite te#hn l $"

3!9ecti/es6 7es&me the # n#epts is#&sse n this se#ti n

%re&re:uisite6 5 mpleti n ! the G.Lite (Splitterless ADSL) re$ister

T#s

Ans,er the ! ll ,in$ 4&esti ns.

;uery

1. r G.Lite 8 splitters l ,er r%tes l , # mple-it" %n l , # st.

2. The ATU*5 DLL %n ATU*7 represent the G.Lite A##ess net, r ,hi#h# nne#ts the 5&st mer E4&ipment t the # re net, r (8%rr ,'%n r9r % '%n ).

3. G.Lite s&pp rts AT; tr%nsp rt nl" interle%ve %t% p%th ne 'e%rer #h%nnel ! r&p stre%m %n %n ther ! r ,nstre%m.

=. I le #ell inserti n @E5 $ener%ti n %n veri!i#%ti n #ell p%"l %s#r%m'lin$< es#r%m'lin$ %n #ell eline%ti n.

/. G.Lite ATU sen s % s&per !r%me ever" 1 mse#. E%#h s&per !r%me is # mp se! D%t% r%mes (D ) ,hi#h %re en# e %n m &l%te int D;T s"m' ls! ll ,e '" % S"n# r%me (S ).

. G.Lite s&pp rts &p t 1./ ;'ps ,nstre%m %n /12 'ps &pstre%m. Depen in$n the spee G.Lite #%n re%#h !r m 3 &p t m ver % 0./ mm # pper ,ire.

. 5h%n$es in l % impe %n#e #%&se '" teleph nes $ in$ n* %n !!*h v i#eh%rm ni#s %!!e#tin$ the ,nstre%m re#eive si$n%l %n n ise (m stl" imp&lse)in e n the h me ,irin$ '" h me e4&ipment.

. The % # #h%nnel is &se ! r 'it*s,%ppin$ %n !%st retr%in pr !ile m%n%$ement.

+. The m%in %ppli#%ti n ver G.Lite Splitterless ADSL is !%st Internet %##ess.

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