Patent ID: 9219616
Filing Date: 2015-12-22
Classification: H04L

Abstract:
1. A method, comprising: receiving, by a network device, one or more frames from a plurality of terminal units in an IEC-101/IEC-104 network; in response to a received frame from a first terminal unit not containing any originator identifier field, adding an originator identifier field with a first original value to the received frame from the first terminal unit, the originator identifier field complying with the IEC-101/IEC-104 protocol; in response to a received frame from a second terminal unit containing the originator identifier field with a second original value, modifying the received frame from the second terminal unit by replacing the second original value of the originator identifier field with a new value identified by the network device, the second original value placed in the originator identifier field by the second terminal unit to identify the second terminal unit; and forwarding a modified frame to a third terminal unit selected from the plurality of terminal units in the IEC-101/IEC-104 network.