Protocol for Enveloping and Routing LPDA2 (Pearl)
Original Publication Date: 1989-Jun-01
Included in the Prior Art Database: 2005-Jan-28
Link Problem Determination Aid Version 2 (LPDA2) is a protocol supported by IBM Signal Converter Products (SCPs) to exchange Communication Network Management (CNM) data with the Data Terminal Equipment (DTE) to which they are attached. The CNM information is carried in LPDA2 frames which flow 'mainstream' on the regular data path. A new protocol is disclosed which allows the transport of CNM information (that is LPDA2 data) either 'mainstream' on the regular data path or 'sidestream' on a 'service' path. This protocol defines on the first hand a frame used to carry the CNM information (referred to as the PEARL frame) and on the other hand the flow of PEARL frames along the different paths. The PEARL command originator is not necessary connected to the target SCP.