1. 1 UNI-N Trib Card in PE node Two operational modes:  service model 1 (client/server)  service model 2 (peer) Two stack modes:  EVC only  EVC & MS-PW client EVC / EVC & PW EVC NCMsp MEP EVC TCMno MEP PW NCMsp MEP PW TCMno MEP Client specific processing UNI-N Trib Card service model 1 EVC / EVC & PW EVC TCMsp MEP EVC TCMno MEP PW TCMsp MEP PW TCMno MEP Client specific processing UNI-N Trib Card service model 2 EVC & PW Client TC EVC TCPW TC NCM: network connection monitoring, TCM: tandem connection monitoring, no: network operator, sp: service provider PW functions not used in EVC only mode Client MIP EVC MIP PW MIP EVC MIP PW MIP

2. 2 INNI Line Card Type 2 I-NNI Line Card in PE node Two stack modes:  EVC only  EVC & MS-PW EVC / EVC & PW PW NCM MEP PW TCMno MEP EVC TCMps MEP mp EVC TCMlc MEP PW TCMps MEP EVP NCM MEP LSP NCM MEP Section NCM MEP INNI Line Card Type 1 EVC / EVC & PW PW NCM MEP PW TCMno MEP EVC TCMps MEP mp EVC TCMlc MEP PW TCMps MEP Section NCM MEP mp EVC TC lc: link connection, no: network operator, ps: protection switch EVC MIP PW MIP EVC MIP PW MIP Bypass PW functionality in EVC only mode PW functions not used in EVC only mode one of the two tunnel technologies will be active

3. 3 E-NNI line card in PE node ENNI Line Card Type 2 EVC / EVC & PW ENNI Line Card Type 1 EVC / EVC & PW mp EVC TC EVC TCMno MEP PW TCMno MEP EVC TCMno MEP PW TCMno MEP lc: link connection, no: network operator, ps: protection switch EVC MIP PW MIP EVC MIP PW MIP Additional TCM/Segment endpoint PW NCM MEP PW TCMno MEP EVC TCMps MEP mp EVC TCMlc MEP PW TCMps MEP EVP NCM MEP LSP NCM MEP Section NCM MEP PW NCM MEP PW TCMno MEP EVC TCMps MEP mp EVC TCMlc MEP PW TCMps MEP Section NCM MEP

4. 4 I-NNI line card in P node Two tunnel/path layers  EVP  LSP NNI Line Card EVP / LSP Section NCM MEP EVP MIP LSP MIP one of the two tunnel technologies will be active

5. 5 Supporting MEP/MIP functions by MEP/MIP resources EVC and PW MEP functions are supported by MEP resources  A MEP resource can be assigned to an EVC or PW transport entity  A MEP resource can be configured to generate/process Ethernet VLAN OAM or MPLS-TP PW or LSP (for PW Segment) OAM EVC and PW MIP functions are supported by MIP resources  A MIP resource can be assigned to an EVC or PW transport entity  A MIP resource can be configured to generate/process Ethernet VLAN OAM or MPLS-TP PW OAM EVP and LSP MEP functions are supported by MEP resources  A MEP resource can be assigned to an EVP or LSP transport entity  A MEP resource can be configured to generate/process Ethernet VLAN OAM or MPLS-TP LSP OAM EVP and LSP MIP functions are supported by MIP resources  A MIP resource can be assigned to an EVP or LSP transport entity  A MIP resource can be configured to generate/process Ethernet VLAN OAM or MPLS-TP LSP OAM