About this document
Understanding Layer 3 on Um Interface by ShahzaibAshraf is a document available to read on EtoBox.
This document provides an overview of layer 3 signaling on the Um interface in GSM networks. It discusses the OSI model and how layer 2 uses the LAPDm protocol on the Um interface. It then focuses on layer 3, explaining that layer 3 signaling messages have a protocol discriminator field, skip indicator/transaction identifier field, and message type field. It provides examples of common information elements included in layer 3 messages and includes a example message dump from TEMS. The document is intended t
- Author
- ShahzaibAshraf
- Language
- EN