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PDH may refer to: 1  Angiotensin-converting enzyme, an enzyme. 2  Plesiochronous digital hierarchy, a technology used in telecommunications networks.
The PDN GW is the point of interconnect between the EPC and the external IP networks. These networks are called PDN (Packet Data Network), hence the name. The PDN GW routes packets to and from the PDNs. The PDN GW also performs various functions such as IP address / IP prefix allocation or policy control and charging.