Services Overview
7705 SAR OS Services Guide Page 43
In general, SAPs are logical endpoints that are local to the 7705 SAR and are uniquely
identified by:
• the physical Ethernet port, SONET/SDH port, or TDM channel group
• the encapsulation type for the service (for example, ATM)
• the encapsulation identifier (ID), which is, for example, the optional VLAN ID for
Epipes, or the channel group ID for Cpipes
Depending on the encapsulation, a physical port or channel can have more than one SAP
associated with it (for example, a port may have several circuit groups, where each group
has an associated SAP). SAPs can only be created on ports or channels designated as
“access” in the physical port configuration.
SAPs cannot be created on ports designated as core-facing “network” ports because these
ports have a different set of features enabled in software.
SAP Encapsulation Types and Identifiers
The SAP encapsulation type is an access property of the Ethernet port, SONET/SDH port, or
TDM channel group used for the service. It identifies the protocol that is used to provide the
service. The 7705 SAR supports three SAP encapsulation types: Ethernet, SONET/SDH,
and TDM. Encapsulation types may have more than one option to choose from. For
example, the options for TDM encapsulation type are “cem” (for circuit emulation service)
and “atm” (for ATM service).
Figure 2: Service Access Point (SAP)
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