Cisco Cisco Packet Data Gateway (PDG) Documentation Roadmaps
Serving Gateway Overview
Network Deployment(s) ▀
Cisco ASR 5000 Series Product Overview ▄
OL-22937-01
Supported Logical Network Interfaces (Reference Points)
The following figure displays the specific network interface between a Serving Gateway and other E-UTRAN network
devices.
devices.
Figure 173. S-GW Interfaces in the E-UTRAN/EPC Network
E-UTRAN
EPC
P-GW
S1-U
S5/S8
S11
Gxc
eNodeB
MME
PCRF
Signaling Interface
Bearer Interface
S-GW
The S-GW provides the following logical network interfaces in support of the E-UTRAN/EPC network:
S4 Interface
This reference point (not shown in the figure above) provides tunneling and management between the S-GW and an
SGSN.
SGSN.
S5/S8 Interface
This reference point provides tunneling (bearer channel) and management (signaling channel) between the S-GW and
the P-GW. The S8 interface is used for roaming scenarios. The S5 interface is used for non-roaming.
the P-GW. The S8 interface is used for roaming scenarios. The S5 interface is used for non-roaming.
Supported protocols:
Transport Layer: UDP, TCP