Alcatel-Lucent 7705 - Service Entities; Figure 1: Service Entities and the Service Model

Services Overview
7705 SAR OS Services Guide Page 41
Service Entities
The basic (logical) service entities in the service model used to construct an end-to-end
service are:
• Customers
• Service Types
• Service Access Points (SAPs)
• Service Destination Points (SDPs)
Figure 1 shows an example of how the service entities relate to the service model. A
subscriber (or customer) attachment circuit connects to a SAP. SDPs define the entrance and
exit points of unidirectional service tunnels, which carry one-way traffic between the two
routers (ALU-A and ALU-B). After SDPs have been configured, they are bound to a service,
which is the final step in making the end-to-end service connection. In Figure 1, the entrance
point is labeled SDP and the exit point is labeled Exit.
Traffic encapsulation occurs at the SAP and SDP. The SAP encapsulation types are
SONET/SDH, Ethernet, and TDM. The SDP encapsulation types are MPLS, GRE, and IP.
For information on SAP encapsulation types, see SAP Encapsulation Types and Identifiers.
For information on SDP encapsulation types, see SDP Encapsulation Types.
Figure 1: Service Entities and the Service Model
ALU-A
Customer
27
Subscribers Subscribers
Service
access
points
Service
destination
points
Service
destination
points
Service
access
points
SAP
Customer
25
SAP
Customer
7
SAP
Customer
27
Customer
25
Customer
7
ALU-B
19686
Exit
SDP
Service
Service
Service
SAP
SAP
SAP
SDP
Service
Service
Service
Exit
Exit
Exit