STM-0 SOH & HO-POH
STM-1 SOH & HO-POH
STM-4 SOH & HO-POH
STM-16 SOH & HO-POH
STM-64 SOH & HO-POH
Lower order VC-n POH
3columns(bytes) s) 1 1
e s m w a o r r f 9 1
2
1
3
VC-3POH
A1A2J0
9columns (bytes) 4 7
36columns (bytes)
B1E1 F1
J1
B1
E1
F1
3
D1D2D3
B3
D1
D2
D3
4
H1H2H3
C2
H1H H1 1 H1H H2 2 H2H2H3H3H3
5
B2K1K2
G1
B2 B2 B2 B2 B 2 K1 K1
K2
6
D4D5D6
F2
D4
D6
D7D8D9
H4
D7
D8
8 D10 D11 D12
F3
D10
D 11
9
K3
S1
S1M1E2
D9 D12 M1 E2
N1
Regenerator Section
Multiplex Section
Higher Order Path
J0 B1
K2
V C- 11 V5
V C- 12 V5
F1
J1
B1
E1
F1
J1
B1
E1
F1
J1
25
34
106
B3
B3
D1
D2
D3
B3
D1
D2
D3
B3
J2
J2
J2
S TM 4-
6 22 0. 8Mb s/
C2
H 1 H 1 H1 H1 H 1 H 1 H 1 H 1 H 1 H 1 H1 H1 H 1 H 1 H 2 H 2 H 2 H2 H2 H 2 H 2 H 2 H 2 H 2 H 2 H2 H2 H 2 H 3 H 3 H 3 H 3 H 3 H3 H3 H 3 H 3 H 3 H 3 H 3 H 3 C2
H 1 H 1 H1 H 1 H 1 H 1 H 1 H 1 H 1 H 1 H1 H1 H 1 H 2 H 2 H 2 H 2 H2 H2 H 2 H 2 H 2 H 2 H 2 H 2 H2 H2 H 3 H 3 H 3 H 3 H 3 H 3 H3 H3 H 3 H 3 H 3 H 3 H 3 C2
H1H1H1H1H1H1 H1H1H1H1H1 H1H2H2H2H2H2 H2H2H2H2H2 H2H2H3H3H3H3 H3H3H3H3H3H3 H3H3
C2
106
2 48 8. 32 M b s/
G1
K2
34
S TM 1 - 6
B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 K1
25
G1
B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 K1
K2
G1
B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 K1
K2
G1
D6
F2
D4
D6
F2
D4
D6
F2
N2
N2
S TM 6 - 4
D4
N2
F2
9 95 3. 28 M b s/ Key
25
34
106
K4
K4
K4
25
34
106
H4
D7
D8
F3
D10
D11
K3
S1
1
3
AIS
s w 4 o r 9 5
MS-RDI
AIS HP-UNEQ HP-TIM
J1
9
HP-BIP
B3
E
HP-REI
A
HP-RDI
AIS
D7
D8
F3
D10
D11
K3
S1
AU pointer
E
LP-REI
A
LP-RDI
D11
S1
M1
D9
H4
D12
F3
E2
K3
MSOH MSOH
HO-POH HO-POH Higher order path overhead
J1
Providesa framealignmentpattern (A1=F6H,A2=28 H).The framealignmentword ofanSTM-Nframeis3x NA1bytesfollowedby3x NA2bytes.
J0
Regeneratorsectiontrace.(16-byte frameincludingCRC7).Supportsc ontinuity testingbetweentransmittingandrec eivingdeviceon eachregeneratorsection.
Z0
Spare.Reservedfor futureinternationalstandardization.
B1
Providesregeneratorsection monitoring.Theregeneratorsection BIP-8providesendto-end error performancemonitoring acrossan individual regenerator section and is calculatedoverall bitsofthe previousSTM-N frameafterscrambling. Computed valueisplaced inB1byte beforescrambling.
C2 G1 F2 H4
C-4 (datapayload)
E1
VC-4
260columns (bytes)
Multiplex section
B2
K1,K2
F1
Allocated for user’spurposes(eg, temporary data/voicechannel connection for specialmaintenanceapplications).
D1–D3
192kb/smessage-based datacommunicationschannelprovidingadministration, monitor, alarm and maintenance functions between regenerator section termination equipment.
B3
TwobytesallocatedforAPS signalingformultiplexsectionprotection. K2(b6–b8)contains MS-RDIand MS-AISstatusinformation.
Provideshigherorder patherrormonitoring.The BIP-8isc alculatedoverall bits of previousVC-n.Computedvalue isplacedin B3bytebefore scrambling.
C2
Higher order path signal label. Indicates composition or the maintenance status ofthe associated container.
LinearAPS messages
K1 byte
Multiplex section Regenerator section
Regenerator section
Con dition
L o c ko u t of p r ot e ct i on
1110 1101 1100 1011 1010 1 00 1 1000 0 11 1 0 11 0 0 10 1 0 1 00 0 01 1 0 01 0 0 0 01 0 0 00
F o cr e ds wi tc h S i gn a l f ai l h gi h p r oi r ti y S i gn a l fa i l l ow p r i or i ty S i gn a l d eg r a de h i g h p ri o rti y S i gn a l d eg r a de l o w p ri o ri t y U nu se d M an u al s wi tc h U nu se d W a ti - to - r es t or e U nu se d E xe rc si e U nu se d R e ve r s er e q ue s t D o no t er ve r t N o re qu es t
1 1 1 1 1 1 1 0 0 0 0 0 0 0 0
b1–b4
Events b6–b8
Multiplex section B2 MultiplexsectionBIP error MS-AIS MultiplexsectionAIS MS-RDI Multiplexsectionremote defectindication MS-REI Multiplexsectionremote errorindication
Higherorderpath AU-LOP Loss ofAU pointer AU-NDF AU pointer – New data flag AU-AIS AUalarmindicationsignal B3 HP BIP errors HP-UNEQ HPunequipped HP-RDI HPremotedefect indication HP-REI HPremoteer rorindication HP-TIM HP trace identifier mismatch HP-PLM HP payload label mismatch
Lower order path TU-LOP Loss ofTUpointer TU-NDF TUpointer – New data flag TU-AIS TU alarm indication signal TU-LOM TUloss of multiframe alignment BIP-2/B3 LPBIPerrors LP-UNEQ LPunequipped LP-RDI LPremote defectindication LP-REI LPremote errorindication LP-RFI LPremote failureindication LP-TIM LPtrace identifiermismatch LP-PLM LP payload label mismatch
®
Turn to Agilent . Dataare basedon information,diagramsand figurestaken fromITU-T Recommendationswith ionswith thekind permissionof theInternational TelecommunicationUnion (ITU)as copyrightholder. Whereappropriate,please consultthe full textof therelevant ITURecommendationsfor the authoritativeversion.Thesemaybe obtainedfromtheITUSales Section,PlacedesNations, CH-1211 Geneva 20, Switzerland; Tel.: +41.22.730.51.11, Fax: +41.22.730.51.94, E-mail:
51. 84 Mb Mb s/
S TM 1-
1 55 5. 2Mb s/
Bytesreservedfornational use. Unscrambledbytes,thereforecare shouldbetakenwith theircontents.
Mediadependentbytes
LO-POH
Lower order path overhead
110 101 100 011 01 0 001 000 111 110 101 100 0 11 010 001 0 00
b 5–b8
Selects channel used by APS messages Con dition
b1–b4
Determines automatic protection switch architecture
b5
0 0 0 = Reserved 0 0 1 = Reserved 0 1 0 = Reserved 0 1 1 = Reserved 1 0 0 = Reserved 1 0 1 = Reserved 1 1 0 = MS-RDI 1 1 1 = MS-AIS
b6–b8
for for for for for for
Con dition
future future future future future future
use use use use use use
b 1–b 4
Lockoutof proteection ction(span) or signal fail (protection) F o r ce d s wi t ch ( s p an ) F o r ce d s wi t ch ( r i ng ) S i gn a l af i l s( p an ) S i gn a l af i l r( i ng ) Signaldegrade (protectiion) on) S i gn a l d eg r a de ( s pa n ) S i gn a l d eg r a de ( r ni g ) M a nu a l s wi t ch ( s p an ) M a nu a l s wi t ch ( r i ng ) W a ti - to - r es t or e E x er c si e r s( p a n) E x er c si e r r( i n g) R e ve r se r e q ue s t s( p a n) R e ve r se r e q ue s t r( i ng ) N o re q ue st
Con dition
Path
G1
Source node ID
0000
Hex c od e
0000
0000
00
0000
0001
01
I nt er pr et at oi n U ne qu pi pe d or s up er vi so ry -u ne qu pi pe d
1 00 1 01
R e se r ve d f o r f ut u r e u es
0100
04
A sy nc hr on ou s ma pp ni g of 3 43 68 k b/ s or 44736kb/sintotheContainer-3(C-3)
11 0
O . 18 1 t e ts s i g na l ( T SS 4 )
111
V C- AI S
A sy nc hr on ou s ma pp ni g of 1 39 26 4 kb s/ intotheContainer-4(C-4)
0 00 00 1
0 01 01 1
13
ATM mapp in g
0 00 00 1
0 10 10 0
14
MAN (D (DQDB) map ping
0 00 00 1
0 10 10 1
15
FDD I map ping
1111
1110
FE
O. 18 1 et st s gi na l T ( SS 1 ot TS TS S3 ) ma pp ni g
1 11 1
1 111
FF
VC-A IS
REI b1
R DI
b2
b3
b4
b5
b6
b7
Meaning
0 00
N or or emo et de de ef ct
O EI
b6
T C- A PI d, T C- RD I , ODI , reserved b7
b 7a nd b8 b8 de if ni ito n
N or or em ot eedd ef ec t
1 3– 16
T C- A PI d b yt e # 2 [ 0 X X X X X X X ]
LC D
1 7– 20
T C- A PI d b yt e # 3 [ 0 X X X X X X X ]
0 01
N or or emo et de de ef ct
010
Re mo et pa pa yl oa dddd ef ec t
011
N or or emo et de de ef ct
N or or em ot eedd ef ec t
10 0
R emo et de de ef ct
A SI ,,LLO P ,T TII M, U UN N EQ (orPLM,LCD)
6 5– 68
T C- A PI d b yt e # 1 5 0[ X X X X X X X ]
6 9– 72
T C- A PI d b yt e # 1 6 0[ X X X X X X X ]
AS I , LO P
7 3 –7 6
T C- R D ,I O D I a n d r e se r ve d ( s ee t a bel b e l ow )
G 8. 12 t ar ns ti R es er ve d
0 11 0
R es er ve d
0 11 1
R es er ve d
1000
G 8. 12 lo ca l
1 00 1
R es er ve d
F2
Higher order path user channel.Allocated for network operator communicationsbetween pathterminations.
H4
Position indicator.Multiframephase .Multiframephase indication for TU structured payloads.
F3
Higher order path user channel.Allocated for network operator communicationsbetween pathterminations.
K3
Higherorder pathautomaticprotectionswitching(b1–b4). Therest ofthe bits (b5–b8)are allocatedforfuture use.
N1
Higherorder tandemconnectionmonitoring.Thereare twopossibleimplementations describedinAnnexCandAnnexDofITU-TG.707 b edinAnnexCandAnnexDofITU-TG.707.InAnnexC,the N1byteprovidesa tandem connection Incoming Error Count (IEC) and the remaining four bits provide an end-to-end data link. The Annex D option contains an incoming error count (IEC), tandem connection REI(TC-REI),outgoing error indication (OEI) and a 76-bytemultiframe containingatandemconnectionacc esspointidentifier( TC-APId).
N1byte structure
Multiplexsectionremote errorindication(MS REI).Conveysthe numberofB2 errors detected by downstream equipment.
I EC b1
b2
TC R- EI b3
b4
b5
O EI
:
:
Fr ame n um ber 73
K4
b6
b7
b8
b 7a nd b8 de if ni it on
1 –8
F r am e al gi n me nt s gi n al : 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0
9 –1 2
T C- AP I d by te # 1 [ 1 C1 C2 C3 C4 C5 C6 C7]
1 3– 16
T C- AP I d by te # 2 [ 0 X X X X X X X ]
1 7– 20
T C- AP I d by te # 3 [ 0 X X X X X X X ] :
6 5– 68
T C- AP I d by te # 1 5 [ 0 X X X X X X X ]
6 9– 72
T C- AP I d by te # 1 6 [ 0 X X X X X X X ]
73–76
TC-RDI,ODIandreserved (see able at ble below)
Frame n umb er
N1 b7 7dd ef ni ti oi n
N2 b8 8dd ef ni ti oi n T C- R DI
74
OD I
Reserved d( efault =“ =“0”)
75
R e se r ve d ( d ef a utl = “ 0 ” )
R e se r ve d ( d ef a ul t = “ 0 ”)
76
R e se r ve d ( d ef a utl = “ 0 ” )
R e se r ve d ( d ef a ul t = “ 0 ”)
Lower order path automatic protection switching (b1–b4) and enhancedremotedefect indication(b5–b7).
K4(b5–b7) codingand interpretation b5–b7
Mean in g
Trigger s
000 00 1
N or or em ot eedd efe ct
01 0
N or or emo et de de ef ct
R em ot e pa yl oa d de fe ct
L CD , PL M
10 1
R em ot e se rv er d ef ec t
A IS , LO P
1 10
R e mo t e c on n e ct i vi t y d ef e ct
T I M, U N E Q
100
111
:
N2 b7 7dd ef ni ti oi n R es er ve d ( de fa utl = “ 0 ”)
011 TC A - PI d, TC R - D ,I ODI,reserved
N1(b7–b8) multiframestructure Frame n umb er
b8
N2(b7–b8) multiframestructure
T C- AP I d by te # 1 [ 1 C1 C2 C3 C4 C5 C6 C7]
0 10 1
Tandem Connection Monitoring ATandemConnectionisa bi-directionalconnectionbetweentwoTCTEs (Tandem Connection Terminating Elements)along an SDH path, which ismanaged as a separate entity.the tandempathis formedfroman SDHVirtualContainer(VC) withspecial maintenancesignalscarried inthepath overhead(POH)bytes. Thesebytes enable monitoring oftandem paths,performanceanalysisand faultlocation -the ability to
b5
F r am e al gi n me n t isg na :l 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0
0100
Concatenation Thelinking together ofvariousdata structures,for exampletwo channelsjoined toform asinglechannel.inSDH,a number(M)ofTUscanbe linkedtogetherto producea concatenatedcon e natedcontainer,MtimesthesizeoftheTU. Anexampleofthisisthe concatenationoffive TU-2stoc arrya 32Mbit/svideo signal,knownas VC-2-5c. Onceassembled,any concatenated VC structureismultiplexed,switched,and transported through thenetwork asa singleentity.
b4
1 –8
T IM , U NE Q
AU pointerbytesare associatedwith,but notpart of,theMSOH. Thepointerc ontained inH1andH2pointstothelocationwheretheVC-nbeg i onwheretheVC-nbegins.Thelasttenbits(b7–b1 t s(b7–b16)of H1H2carrythepointervalue(0to782).TheH3bytesare“point u e(0to782).TheH3bytesare“pointeraction e raction”bytesand carry“live” information,fromaVC-4, duringtheSTM-N framein whicha negative pointeradjustmentoccurs.
I n co mi ng T C- RE I AI S
9 –1 2
A SI ,,LLO P ,T TII M, U UN N EQ (orPLM,LCD)
Providesexpressorderwire channelforvoice communicationsbetweenmultiplexsection terminatingequipment.
b3
N or or em ot eedd ef ec t
R emo et de de ef ct
H1–H3
“ 1”
b2
Frame n um ber
R em ot e co n ne c itvi ty d e ef ct
E2
N2byte structure B IP - 2
Triggers
111
D o n o t u se f o r s y nc h ro n i za t oi n
Lower order tandem connection monitoring.ContainsBIP-2 error checking, AIS,tandem connectionREI(TC-REI), outgoingerrorindication(OEI) anda 76-bytemultiframecontainingatandem connectionaccesspoint identifier (TC-APId).
G1(b5–b7) codingand interpretation b5–b7
11 0
1111
Lowerordertrail traceidentifier(16-byte frameincludingCRC7). Supportsend-to-end monitoring ofalower order path.
b8
R es er ve d
R es er ve d
J2
Sp are
R es er ve d
1 11 0
B yt e s yn c hr on o us
N2
Higher order path status. Sends status and performance monitoring information from receiving path terminating equipment to originating equipment. Allowsstatus and performance of two-way path tobe monitored at either end.
Q u ailt y u n kn o wn ( e x si t ni g s y nc n e t wo r k )
R es er ve d
B ti s y nc h or no u s
01
TUG-stru ctu re
0000
G.811
R es er ve d
A sy n ch ro n ou s
E qu pi pe dd- nnoo n- sp ec fii c
0 01 1
R es er ve d
E q upi p e d – n o n- s p ec i ifc
0 10
Locked TU
12
R DI b8
Meaning U n e qu i p pe d o r s u p er v i so r y- u n eq u pi p e d
001
02
0010
Sig nal al b el b6 b7
000
03
0 00 1
S y nc h ro n o us e q u pi m en t t i min g s ou r c e ( SE TS )
b5
V5(b5–b7)signallabel b5–b7
0 01 01 0
1011
RF I b4
0 01 01 0
Path code: 0 = short path; 1 = long path 0 0 0 = Idle 0 0 1 = Bridged 0 1 0 = Bridged and switched 0 1 1 = Reserved for future use 1 0 0 = Reserved for future use 1 0 1 = Reserved for future use 1 1 0 = MS-RDI 1 1 1 = MS-AIS
R EI b3
b2
0 01 01 1
R em ot e se rv er d ef ec t
1 10 1
b1
0 00 0
10 1
1 10 0
BIP- 2
0 00 00 0
SDHsynchronizationqualityle o nqualityleveldescription p tion
1 01 0
ProvidesBIP-2error checking,signallabel andpathstatus information.
b1
Synchronizationstatusmessages.S1 (b5–b8)indicateswhich ofthe fourlevelsof synchronizationisbeingused atthe transmitendof amultiplexsection. S1byte b5–b8
b 5–b 8
0001
Destination node ID
K 2byte
Selects bridged channel used
V5
C2byte mapping
D4–D12 Provide576kb/s datacommunicationchannelbetweenmultiplexsection termination equipment.Used to carry network administration and maintenanceinformation. S1
M1
Need a test solution?
K 1byte b1–b4 1 1 11
b5–b8
Regenerator section
Thefirst byteinthe VirtualContainer.Itslocationis indicatedbythe AU pointer (H1H2bytes).Provides a higherordertrail trace.identifier(64-bytefree formatstring or 16-byte frame including CRC7). Supports e nd-to-end monitoring of a higher order path.
ITU-T G.841 protection switching protocol
b1–b4 1111
b5
Physical/regenerator section LOS Lossof signal OOF Out of frame LOF Lossof frame B1 RegeneratorsectionBIP error RS-TIM Regeneratorsectiontrace identifiermismatch
RingAPS messages
ITU-T G.783 protection switching protocol
Provideslocal orderwirechannel for voice communicationsbetween regenerators, hubsand remote terminal locations.
J1
Providesmultiplexsectionerror monitoring.TheBIP-N x24, ofan STM-Nframe,provides end-to-end error performancemonitoring acrossan individual multiplexsection and is calculatedoverall bitsof thepreviousSTM-N frameexceptfor the firstthree rowsofSOH. Computedvalueis placedin B2bytebefore scrambling.
K2 byte AIS
S TM 0 Numberofbytes ofdataseparating fields.
N1
Multiplex section overhead
AIS
LP-PLM
V5
D8
D10
K3
RSOH A1,A2
B3 Multiplex Section Overhead MSOH
VC-4 POH
AIS
LP-BIP
V5
D7
F3
Regenerator section overhead
LP-TIM
J2
H4
E2
N1
LP-UNEQ
V5
D9 D12 M1
HP-PLM
C2
D5
V C- 2 V5
(forVC-11,VC-12 orVC-2) 270
F3
TU-LOM
H4
9 Regenerator Section Overhead RSOH
N1
TU-LOP
V5
H4
E2
K3 TU-AIS
V5
D9 D12
STM-1 frame (to ITU-T G.707)
Lower Order Path
1
C2
D5
VC-4POH
A 1 A 1 A 1 A 1 A 1 A 1 A 1 A 1 A 1 A 1 A 1 A 1 A 2 A 2 A 2 A 2 A 2 A 2 A 2 A 2 A 2 A 2 A 2 A 2 J 0 Z 0 *Z 0* Z 0* Z 0* Z 0*
N1
AU-AIS
G1
M1
VC- 4 POH
261columns (bytes)
AU-LOP
G1
D5
MS-BIP
A
385
D3
AIS
MS-REI
193
E1
MS-AIS
E
1
D2
RS-BIP
B2 M1
97
A 1 A 1 A 1 A 1 A 1 A 1 A 1 A 1 A 1 A 1 A 1 A 1 A 2 A 2 A 2 A 2 A 2 A 2 A 2 A 2 A 2 A 2 A 2 A 2 J 0 Z 0 *Z 0 *Z 0* Z 0* Z 0*
270columns (bytes)
RS-TIM
576columns (bytes)
49
D1
LOF
K2
1
B1
VC- 4 POH
N1
LOS A1/A2
144columns (bytes) 25
A 1 A 1 A 1 A 1 A 1 A 1 A 1 A 1 A 1 A 1 A 1 A 1 A 2 A 2 A 2 A 2 A 2 A 2 A 2 A 2 A 2 A 2 A 2 A 2 J 0 Z 0 *Z 0* Z 0*
2
7
13
J1
VC-4POH
A1A A1 1 A1A A2 2 A2A2J0
D5
1
N1 b8 8dd ef ni ti oi n
73
R es er ve d ( de fa u tl = “ 0” )
T C- RD I
74
ODI
Reserved d( efau lt =“ =“0”)
75
R e se r ve d ( d e af u l t = “ 0” )
R e se r ve d ( d e af u l t = “ 0” )
76
R e se r ve d ( d e af u l t = “ 0” )
R e se r ve d ( d e af u l t = “ 0” )
