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Optical transport network interface structure

technical


Optical transport network interface structure

The optical transport network as specified in ITU-T Rec. G.872 defines two interface classes:



Inter-domain interface (IrDI);

Intra-domain interface (IaDI).

The OTN IrDI interfaces are defined with 3R processing at each 838d39i end of the interface.

The Optical Transport Module-n (OTM-n) is the information structure used to support OTN

interfaces. Two OTM-n structures are defined:

OTM interfaces with full functionality (OTM-n.m);

OTM interfaces with reduced functionality (OTM-0.m, OTM-nr.m).

The reduced functionality OTM interfaces are defined with 3R processing at each 838d39i end of the

interface to support the OTN IrDI interface class.












ITU-T Rec. G.709/Y.1331 (03/2003)        




Basic signal structure

The basic structure is shown in Figure 6-1.


Clients (e.g., STM-N, ATM, IP, Ethernet, OTN ODUk)



OPUk


ODUkP

ODUk

ODUkT



OTUkV        OTUk                     OTUkV           OTUk



OCh          OChr



OMSn

OPSn

OTSn

G.709/Y.1331_F6-1



OTM-n.m                OTM-0.m, OTM-nr.m

Full functionality                      Reduced functionality

OTM interface                              OTM interface


Figure 6-1/G.709/Y.1331 Structure of the OTN interfaces


OCh substructure

The optical channel layer as defined in ITU-T Rec. G.872 is further structured in layer networks in order to support the network management and supervision functionalities defined in ITU-T Rec. G.872:

The optical channel with full (OCh) or reduced functionality (OChr), which provides
transparent network connections between 3R regeneration points in the OTN.

The completely or functionally standardized optical channel transport unit (OTUk/OTUkV)

which provides supervision and conditions the signal for transport between 3R regeneration

points in the OTN.

The optical channel data unit (ODUk) which provides:

tandem connection monitoring (ODUkT);

end-to-end path supervision (ODUkP); and

adaptation of client signals via the Optical Channel Payload Unit (OPUk).

Full functionality OTM-n.m (n ≥ 1) structure

The OTM-n.m (n ≥ 1) consists of the following layers:

optical transmission section (OTSn);

optical multiplex section (OMSn):

full functionality optical channel (OCh);

completely or functionally standardized optical channel transport unit (OTUk/OTUkV);

optical channel data unit (ODUk).


ITU-T Rec. G.709/Y.1331 (03/2003)




Reduced functionality OTM-nr.m and OTM-0.m structure

The OTM-nr.m and OTM-0.m consists of the following layers:

optical physical section (OPSn);

reduced functionality optical channel (OChr);

completely or functionally standardized optical channel transport unit (OTUk/OTUkV);

optical channel data unit (ODUk).

Information structure for the OTN interfaces

The information structure for the OTN interfaces is represented by information containment relationships and flows. The principal information containment relationships are described in Figures 6-2, 6-3 and 6-4. The information flows are illustrated in Figure 6-5.

For supervision purposes in the OTN, the OTUk/OTUkV signal is terminated whenever the OCh signal is terminated.



Client














ODUk tandem connection





OTUk[V] OTUk[V]

section         OH


OCh



OPUk



ODUk path      ODUk

PMOH





ODUk

TCMOH



OPUk

OH



OPUk payload



OPUk



ODUk TC L1



ODUk TC Lm

ODUk

TCMOH



OTUk[V] FEC










ODUk

TCMOH                      1 to 6 levels

of ODUk

tandem

connection

monitoring

OCh




OCG-n.m




OMU-n.m



OTM-n.m

OH




OCCp               OCCp



OMSn

OH


OTSn

OH


OOS

OCh payload




OCCp   OCCp OCCp



OMSn payload



OTSn payload

G.709/Y.1331_F6-2


Figure 6-2/G.709/Y.1331 - OTM-n.m principal information containment relationships















ITU-T Rec. G.709/Y.1331 (03/2003)      







Client














ODUk tandem connection





OTUk[V]      OTUk[V]

section            OH



OPUk



ODUk path        ODUk

PMOH






ODUk

TCMOH



OPUk

OH



OPUk payload



OPUk



ODUk TC L1



ODUk TC Lm

ODUk

TCMOH



OTUk[V] FEC











ODUk

TCMOH                           1 to 6 levels

of ODUk

tandem

connection

monitoring




OChr                                              OCh payload



OTM-0.m                                                  OPS0

G.709/Y.1331_F6-3


Figure 6-3/G.709/Y.1331 - OTM-0.m principal information containment relationships



Client



OPUk



ODUk



OPUk

OH



OPUk payload







ODUk tandem connection





OTUk[V] OTUk[V]

section            OH


OChr




OCG-nr.m   OCCp



OTM-nr.m

ODUk path






ODUk

TCMOH













OCCp

PMOH



















OCCp

OPUk



ODUk TC L1



ODUk TC Lm

ODUk

TCMOH



OTUk[V] FEC



OCh payload




OCCp OCCp



OPSn




ODUk

TCMOH                         1 to 6 levels

of ODUk

tandem

connection

monitoring

G.709/Y.1331_F6-4


Figure 6-4/G.709/Y.1331 - OTM-nr.m principal information containment relationships












ITU-T Rec. G.709/Y.1331 (03/2003)






Client                 Client_CI

ODUkP/CL

OPUk                   OCh_AI

ODUkP




ODUk

ODUkT/ODUk
    
ODUkT



ODUk






































OTM-0


OTUk/ODUk


OTUk


OTUk


OCh/OTUk


OChr



OChr_CI





n              OPS/OChr

OPS_AI       OCG-n











OPS

OPS_CI

OTM-0

OTM-nr

OTM-nr (n>1)


OTUkV/ODUk


OTUkV


OTUkV


OCh/OTUkV


OCh



OCh_CI

OCh

OCh_CI

OCh_CI_PLD           

OMS/OCh                                   n                 

OCG-n          OMS_AI

OMS

OMS_CI_PLD


OMU-n

OMS_CI


OTS/OMS

OTS_AI

OTS_CI_PLD

OTS


OTS_CI

OTM-n

OTM-n (n













OCh OH




OCh OH



OCh OH

OCh_CI_OH




OMS OH


OMS_CI_OH


OMS OH



OTS OH

OTS_CI_OH

COMMs

OSC




G.709/Y.1331_F6-5

NOTE - The model in this figure is for illustrative purposes only. represents an optical wavelength.


Figure 6-5/G.709/Y.1331 Example of information flow relationship






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