Cisco Cisco ASR 5000

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Supported Logical Network Interfaces (Reference Points)
The HSGW supports many of the standards-based logical network interfaces or reference points. The graphic
below and following text define the supported interfaces. Basic protocol stacks are also included.
Figure 3: HSGW Supported Network Interfaces
In support of both mobile and network originated subscriber PDP contexts, the HSGW provides the following
network interfaces:
A10/A11 Interface
This interface exists between the Evolved Access Network/Evolved Packet Control Function (eAN/ePCF)
and the HSGW and implements the A10 (bearer) and A11 (signaling) protocols defined in 3GPP2 specifications.
S2a Interface
This reference point supports the bearer interface by providing signaling and mobility support between a
trusted non-3GPP access point (HSGW) and the PDN Gateway. It is based on Proxy Mobile IP but also
supports Client Mobile IPv4 FA mode which allows connectivity to trusted non-3GPP IP access points that
do not support PMIP.
HSGW Administration Guide, StarOS Release 19    
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HRPD Serving Gateway Overview
HRPD Serving Gateway in an eHRPD Network