Service Entities
Page 42 7705 SAR OS Services Guide
Customers
The terms customers and subscribers are used synonymously. Every customer account must
have a customer ID, which is assigned when the customer account is created. To provision a
service, a customer ID must be associated with the service at the time of service creation.
Service Types
Service types provide the traffic adaptation needed by customer attachment circuits (ACs).
This (logical) service entity adapts customer traffic to service tunnel requirements. The
7705 SAR provides four types of VLL service (that is, point-to-point MPLS-based
emulation service, also called Virtual Private Wire Service (VPWS)): ATM VLL (Apipe),
circuit emulation VLL (Cpipe), Ethernet VLL (Epipe), and IP interworking VLL (Ipipe)
service types. The 7705 SAR also provides IP layer VPRN and Internet Enhanced Services,
that offer any-to-any connectivity within a Virtual Routing Domain or Generic Routing
Domain, respectively.
Service Access Points (SAPs)
A service access point (SAP) is the point at which a service begins (ingress) or ends (egress)
and represents the access point associated with a service. A SAP may be a physical port or a
logical entity within a physical port. For example, a SAP may be a channel group within a
DS1 or E1 frame, an ATM endpoint, an Ethernet port, or a VLAN that is identified by an
Ethernet port and a VLAN tag. Each subscriber service connection on the 7705 SAR is
configured to use only one SAP.
A SAP identifies the customer interface point for a service on a 7705 SAR router. Figure 2
shows one customer connected to two services via two SAPs. The SAP identifiers are 1/1/5
and 1/1/6, which represent the physical ports associated with these SAPs. The physical port
information should be configured prior to provisioning a service. Refer to the 7705 SAR OS
Interface Configuration Guide for more information on configuring a port. See Port and SAP
CLI Identifiers on page 85 for more information on identifiers.
The 7705 SAR supports the following services types: ATM pseudowires (Apipe), TDM
pseudowires (Cpipe), IP pseudowires (Ipipe), Ethernet pseudowires (Epipe), IES, and
VPRN services. Customer access to these services is given via SAPs. For each service type,
the SAP has slightly different parameters.
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