1. ONF OTCC TAPI Contribution
TAPI Termination Model (Examples of Adaptation, Termination & Connection)*
Karthik Sethuraman (NEC)
Andrea Mazzini (Nokia)
Nigel Davis (Ciena)
* animated

2. TAPI LTP (NEP/CEP/SEP) Modeling Considerations
The TAPI Logical-Termination-Point (LTP) – namely Node-Edge-Point (NEP), Connection-End-Point (CEP) and Service-End-Point (SEP) – are by design, intended to be a generic, flexible modeling constructs, that can model
Different technology layers
Different network configurations
Different vendor equipment capabilities
So as such, the inherent flexibility, while preserving the underlying pattern, could lead to different model arrangements for same functional configuration
Any attempt to constrain the options is an balancing exercise between consistency and variety
Attempting to apply the same model consistently to all potential use case configurations could lead to presence extra artifacts for simpler configurations
This is due to the fact that the model has to complete enough to model more complex configurations
On other hand, attempting to optimize the model arrangement for specific configurations would lead to large variety in the models

3. Layer Protocol cases in ONF Core IM (fig 4-3)
Key to encapsulated Structure in LP
Cases not used in this slide deck
Encapsulated FC
Full Layer, Fixed
Adjustable Encapsulated FC F
Fixed Encapsulated FC
CP (port) [Is G.805 CP]
Can be associated with FC
TCP (port) [Is G.805 TCP]
Full Layer, Flexible (with
Optional Exposed CP)
AP [Is G.805 AP]
Association to another LP (may be inter LTP)
Note: If not shown at the top of an LTP means the LTP does not expose signal, e.g. monitor TP
Exposed TCP F
Dual CP Pool (encapsulating zero length link)
Exposed CP with layer content rearranged
(note: has n encapsulated sub-layer CPs)
Peer CP
Exposed CP
Adapter
with pool
Pool only
Concatenating Adapter (alternative)
Concatenating Adapter
Concatenatable Exposed TCP (alternative)
Concatenatable Exposed TCP

4. TAPI Mapping from ITU-T
CP = Connection Point
AP = Access Point
TCP =Termination Connection Point
TTP = Trail Termination Point
CTP = Connection Termination Point
LTP = Logical Termination Point
NEP = Node Edge Point
CEP = Connection End Point
= Adaptation
= Termination
= Flexible connection F
= Fixed connection m
= List of supported
client types/layers n
= Number of supported
instances per client type

5. TAPI LTP Arrangements
Basic NEP/CEP Arrangements for OTSi, ODU & ETH layers

6. TAPI LTP Template – Basic Arrangements
ODU (10x10G)
ETH, SDH, LO-ODU…
(10G)
Node
NodeEdgePoint
Device
Connection X
ServiceInterfacePoint
Link
Link Connection*
Transitional Link
Layer Protocol
ConnectionEndPoint
ODU p m n
ODU (100G)
ODU (100G)
ODU (10G)
NEP Aggregates NEPs
(same layer, capacity pool)
CEP has-server NEP
(same layer)
CEP has-client NEP
(same-layer or different layers)
NEP connects-to NEP in another Node via Link
(same layer)
(a)
(b) F
CEP connects-to-peer CEP via switched Connection
(same layer) flexible cases with exposed CP
NEP connects-to NEP in another Node via Transitional Link
(different layer) F
(a)
(b)   F F F
CEP connects-to CEP in another Node via Link Connection
(same layer)
CEP connects-to-peer CEP via Encapsulated XC
(same layer) fixed-mapping cases
* Link Connection is not explicitly modeled in TAPI

7. OTSi LTP (CEP/NEP) Arrangement in TAPIF
OTU_ODU AdapPac
OTU TermPac
OTU CEP
OTU CtpPac
Other OTSi
Client NEP(s)
OTU PoolPac
n=1
OTU NEP
OTSiA_OTU AdapPac
OTSi TerminationPac [1..*]
selectedNominalCentralFrequency
supportableNominalCentralFrequency [1..*]
selectedApplicationIdentifier
supportableApplicationIdentifer [1..*]
OTSiA CEP
n=1
OTSiG CtpPac
selectedFrequencySlot [1..*]
OTSiA NEP
OTSiA PoolPac
supportableFrequencySlot [0..*]
occupiedFrequencySlot [0..*]

8. OTSi Subnet (Node) Arrangement in TAPI
OTSiA Connection
OTSiA CEP
n=1..*
OTSiA NEP
OTSiA CEP
Port L1
OTSiA Link
OTSiA Conn
OTSiA Node
n=1
OTSiA NEP
OTSiA CEP
OTSiA Connection
n=1..*
OTSiA NEP
Port D1
Port L2
OTSiA Link
XOR – all possible alternatives for an OTSi assembly (OTSiG + O) – as per ITU-T G.872, the entire assembly has to be switched/terminated as a group

9. Multi-layer Connectivity Termination Examples
Sample Multilayer NEP/CEP Terminations for Single Domain Connectivity cases

10. Multi-layer Mapping with NO Switching1
10G(x10) EPL o/ 10G(x10) ODU o/ 100G ODU w/ NO Switching
ETH Link Connection (?)
ETH
ETH Link (10G)
ETH
CE1
CE2
Client Context
TAPI Context
ETH 10G Connectivity Service X Y
ETH SIP
ETH SIP
ETH Connection (10G)
* Link Connection is not explicitly modeled in TAPI
Node
NodeEdgePoint
Device
Connection X
ServiceInterfacePoint
Link
Link Connection*
Transitional Link
Layer Protocol
ConnectionEndPoint
ConnServiceEndPoint
ETH
ETH
ETH Link Connection (10G)
ETH Link (10G)
100G
ODU Connection (10G)
100G
ODU Link Conn (10G)
ODU2 Link (100G)
ODU
ODU Conn (100G)
ODU
ODU (100G)
ODU (100G)
PE1
ODU4 (100G)
ODU4 (100G)
ODU
PE2

11. Multi-layer Mapping with NO Switching1
10G(x10) EPL o/ 10G(x10) ODU o/ 100G ODU w/ NO Switching
ETH F
ETH
CEP X
ETH X X X
ETH
ETH SIP
(x10)
ETHInt
NEP
ETH
ETHClt
NEP
(x10)
Layer = ETH
Total Pool Capacity=10G
supported granularity=10G
Layer = ETH
Total Pool Capacity=10G
supported granularity=10G
ETH
POOL F
Layer = ETH
Total Pool Capacity=100G
supported granularity=10G
ODU
ODU2
CEP
ETHoODU
ODU
ODU
* Link Connection is not explicitly modeled in TAPI
Node
NodeEdgePoint
Device
Connection X
ServiceInterfacePoint
Link
Link Connection*
Transitional Link
Layer Protocol
ConnectionEndPoint
ConnServiceEndPoint
ODU2
NEP
Layer = ODU
Total Pool Capacity=100G
supported granularity=10G F
Layer = ODU
Total Pool Capacity=100G
supported granularity=10G
ODU
POOL
ODU4
CEP
ODU
ODU
ODU
ODU4
NEP
ODU
PE1
Layer = ODU
Total Pool Capacity=100G
supported granularity=100G

12. Multi-layer Mapping with Server-layer-only Switching
10G(x10) EPL o/ 10G(x10) ODU o/ 100G ODU w/ ODU2 Switching
ETH Link Connection (?)
ETH
ETH Link (10G)
ETH
CE1
CE2
Client Context
TAPI Context
ETH 10G Connectivity Service X Y
ETH SIP
ETH SIP
ETH Connection (10G)
* Link Connection is not explicitly modeled in TAPI
Node
NodeEdgePoint
Device
Connection X
ServiceInterfacePoint
Link
Link Connection*
Transitional Link
Layer Protocol
ConnectionEndPoint
ConnServiceEndPoint
ETH Link Connection (10G)
ETH
ETH
ETH Link (10G)
ODU Connection (10G)
100G
100G
ODU Link Conn (10G)
ODU2 Link (100G)
ODU Conn (100G)
ODU (100G)
ODU (100G)
ODU
PE1
ODU4 (100G)
ODU4 (100G)
ODU
ODU
PE2

13. Multi-layer Mapping with Server-layer-only Switching
10G(x10) EPL o/ 10G(x10) ODU o/ 100G ODU w/ ODU2 Switching
ETH F
ETH
CEP
ETH X
ETH X X
ETHInt
NEP
ETH X
ETH SIP
(x10)
Layer = ETH
Total Pool Capacity=10G
supported granularity=10G
ETHClt
NEP
(x10)
ETH
POOL
Layer = ETH
Total Pool Capacity=10G
supported granularity=10G
ODU2
TTP
ODU
Layer = ETH
Total Pool Capacity=100G
supported granularity=10G
ODU2
CTP
ODU
ODU
ODU2
NEP
ODU
* Link Connection is not explicitly modeled in TAPI
Node
NodeEdgePoint
Device
Connection X
ServiceInterfacePoint
Link
Link Connection*
Transitional Link
Layer Protocol
ConnectionEndPoint
ConnServiceEndPoint
ETHoODU F
Layer = ODU
Total Pool Capacity=100G
supported granularity=10G
ODU4
CEP
Layer = ODU
Total Pool Capacity=100G
supported granularity=10G
ODU
POOL
ODU
ODU
ODU
PE1
ODU
ODU4
NEP
Layer = ODU
Total Pool Capacity=100G
supported granularity=100G

14. Multi-layer Mapping with Server-layer-only Switching2b
10G(x10) EPL o/ 10G(x10) ODU o/ 100G ODU w/ ODU4 Switching
ETH Link Connection (?)
ETH
ETH Link (10G)
ETH
CE1
CE2
Client Context
TAPI Context
ETH 10G Connectivity Service X Y
ETH SIP
ETH SIP
ETH Connection (10G)
* Link Connection is not explicitly modeled in TAPI
Node
NodeEdgePoint
Device
Connection X
ServiceInterfacePoint
Link
Link Connection*
Transitional Link
Layer Protocol
ConnectionEndPoint
ConnServiceEndPoint
ETH Link Connection (10G)
ETH
ETH
ETH Link (10G)
ODU
100G
ODU Connection (10G)
100G
ODU Link Conn (10G)
ODU2 Link (100G)
ODU Conn (100G)
ODU (100G)
ODU (100G)
ODU
ODU4 (100G)
ODU4 (100G)
PE1
ODU
PE2

15. Multi-layer Mapping with Server-layer-only Switching2b
10G(x10) EPL o/ 10G(x10) ODU o/ 100G ODU w/ ODU4 Switching
ETH F
ETH
CEP
ETH X X X X
ETH
ETHInt
NEP
ETH
ETH SIP
(x10)
Layer = ETH
Total Pool Capacity=10G
supported granularity=10G
ETHClt
NEP
(x10)
ETH
POOL F
Layer = ETH
Total Pool Capacity=10G
supported granularity=10G
ODU2
CEP
Layer = ETH
Total Pool Capacity=100G
supported granularity=10G
ODU
ODU
ETHoODU
ODU2
NEP
ODU
* Link Connection is not explicitly modeled in TAPI
Node
NodeEdgePoint
Device
Connection X
ServiceInterfacePoint
Link
Link Connection*
Transitional Link
Layer Protocol
ConnectionEndPoint
ConnServiceEndPoint
Layer = ODU
Total Pool Capacity=100G
supported granularity=10G
Layer = ODU
Total Pool Capacity=100G
supported granularity=10G
ODU
POOL
ODU4
TTP
ODU
ODU4
CTP
ODU
ODU
ODU
PE1
ODU
ODU4
NEP
Layer = ODU
Total Pool Capacity=100G
supported granularity=100G

16. Multi-layer Switching
10G(x10) EPL o/ 10G(x10) ODU o/ 100G ODU w/ ETH+ODU2 Switching
ETH Link Connection (?)
ETH
ETH Link (10G)
ETH
CE1
CE2
Client Context
TAPI Context
ETH 10G Connectivity Service X Y
ETH SIP
ETH SIP
ETH Connection (10G)
* Link Connection is not explicitly modeled in TAPI
Node
NodeEdgePoint
Device
Connection X
ServiceInterfacePoint
Link
Link Connection*
Transitional Link
Layer Protocol
ConnectionEndPoint
ConnServiceEndPoint
ETH Link Connection (10G)
ETH
ETH
ETH Link (10G)
ODU Connection (10G)
100G
100G
ODU Link Conn (10G)
ODU2 Link (100G)
ODU Conn (100G)
ODU (100G)
ODU (100G)
ODU
PE1
ODU4 (100G)
ODU4 (100G)
ODU
ODU
PE2

17. Multi-layer Switching
10G(x10) EPL o/ 10G(x10) ODU o/ 100G ODU w/ ETH+ODU2 Switching
ETHClt
CTP
ETH
ETH
ETHInt
CTP
ETH
ETH X X
ETHInt
NEP
ETH X X
ETH SIP
(x10)
Layer = ETH
Total Pool Capacity=10G
supported granularity=10G
ETHClt
NEP
(x10)
ETH
POOL
Layer = ETH
Total Pool Capacity=10G
supported granularity=10G
ODU2
TTP
ODU
Layer = ETH
Total Pool Capacity=100G
supported granularity=10G
ETHoODU
ODU2
CTP
ODU
ODU
ODU2
NEP
ODU
* Link Connection is not explicitly modeled in TAPI
Node
NodeEdgePoint
Device
Connection X
ServiceInterfacePoint
Link
Link Connection*
Transitional Link
Layer Protocol
ConnectionEndPoint
ConnServiceEndPoint F
Layer = ODU
Total Pool Capacity=100G
supported granularity=10G
ODU4
CEP
ODU
POOL
Layer = ODU
Total Pool Capacity=100G
supported granularity=10G
ODU
ODU
ODU
PE1
ODU
ODU4
NEP
Layer = ODU
Total Pool Capacity=100G
supported granularity=100G

18. Multi-layer Switching3b
10G(x10) EPL o/ 10G(x10) ODU o/ 100G ODU w/ ETH+ODU4 Switching
ETH Link Connection (?)
ETH
ETH Link (10G)
ETH
CE1
CE2
Client Context
TAPI Context
ETH 10G Connectivity Service X Y
ETH SIP
ETH SIP
ETH Connection (10G)
* Link Connection is not explicitly modeled in TAPI
Node
NodeEdgePoint
Device
Connection X
ServiceInterfacePoint
Link
Link Connection*
Transitional Link
Layer Protocol
ConnectionEndPoint
ConnServiceEndPoint
ETH Link Connection (10G)
ETH
ETH
ETH Link (10G)
100G
ODU Connection (10G)
100G
ODU Link Conn (10G)
ODU2 Link (100G)
ODU Conn (100G)
ODU (100G)
ODU (100G)
ODU
PE1
ODU4 (100G)
ODU4 (100G)
ODU
ODU
PE2

19. Multi-layer Switching3b
10G(x10) EPL o/ 10G(x10) ODU o/ 100G ODU w/ ETH+ODU4 Switching
ETH
ETHClt
CTP
ETH
ETHInt
CTP
ETH X X X X
ETH
ETHInt
NEP
ETH
ETH SIP
(x10)
Shim Layer = ETH
Total Pool Capacity=10G
supported granularity=10G
ETHClt
NEP
(x10)
ETH
(100G) F
Shim Layer = ETH
Total Pool Capacity=10G
supported granularity=10G
ODU2
CEP
ODU
Shim Layer = ETH
Total Pool Capacity=100G
supported granularity=10G
ODU
ETHoODU
ODU2
NEP
ODU
* Link Connection is not explicitly modeled in TAPI
Node
NodeEdgePoint
Device
Connection X
ServiceInterfacePoint
Link
Link Connection*
Transitional Link
Layer Protocol
ConnectionEndPoint
ConnServiceEndPoint
Shim Layer = ODU
Total Pool Capacity=100G
supported granularity=10G
ODU
POOL
ODU4
TTP
Shim Layer = ODU
Total Pool Capacity=100G
supported granularity=10G
ODU
ODU
ODU
ODU4
CTP
ODU
ODU
PE1
ODU4
NEP
Shim Layer = ODU
Total Pool Capacity=100G
supported granularity=100G

20. Additional cases / Alternate Views