Cisco ASR 5000 Series Product Overview ▄  
For more information on the Gy interface and online accounting, refer to Gy Interface Support  in the Features and 
Functionality - Base Software section of this guide. 
 
PDN Gateway in the E-UTRAN/EPC Network 
The following figure displays a simplified network view of the P-GW and how it interconnects with other 3GPP 
Evolved-UTRAN/Evolved Packet Core network devices. 
 
Figure 132.  P-GW in the E-UTRAN/EPC Network 
E-UTRAN
EPC
S-GW
S1-U
S5/S8
S11
Gx
Gxc
S1-MME
eNodeB
S6a
MME
PCRF
3GPP 
AAA
S6b
SWx
HSS
Signaling Interface
Bearer Interface
OFCS
OCS
Gy
Internet
SGi S2b
S2c
Enterprise
P-GW
Trusted/Untristed
Non-3GPP Devices
Rf / Gz