TL1 is a commonly used management protocol in telecommunication networks. This tutorial covers the history and evolution of TL1, message structure and syntax of TL1 commands, and the TL1 features.

Table of Contents

• 1.0 History and Evolution of TL1
• 2.0 TL1 – The Telecom Management Protocol
• 2.1 TL1 and SNMP: A comparison
• 3.0 TL1 Language
• 3.1 TL1 Message Types
• 3.2 TL1 Input Message
• 3.2.1 Command Code
• 3.2.2 Staging Block
• 3.2.3 Payload Block
• 3.2.4 Examples for TL1 input commands:
• 3.3 TL1 Acknowledgment
• 3.3.1 Acknowledgment code
• 3.3.2 CTAG
• 3.3.3 Terminator
• 3.4 TL1 Response Message
• 3.4.1 Response Header
• 3.4.2 Response ID
• 3.4.3 Response Block
• 3.4.4 Terminators
• 3.4.5 Examples for TL1 response messages:
• 3.5 TL1 Autonomous Message
• 3.5.1 Header
• 3.5.2  Auto ID
• 3.5.3 Text Block
• 3.5.4 Terminators
• 3.5.5 Examples for TL1 Autonomous messages
• 3.6 Verb  List
• 3.7 TL1 Parameters
• 3.7.1 Position-Defined Parameters
• 3.7.2 Name-Defined Parameters
• 4.0 TL1 Provisioning Messages
• 4.1 Equipment Provisioning Messages
• 4.2 Facilities Provisioning Messages
• 4.3 Cross-connect Provisioning
• 4.4 Facility Protection Group (FFP) Provisioning 23
• 4.5 Gateway NE Map Provisioning
• 5.0 TL1 Protection Switching Messages
• 5.1 Switching Messages
• 5.2  SONET Protection Switching Messages
• 5.3 Non-SONET Line Protection Switching Messages
• 6.0 Telcordia GRs
• 7.0 Gateway NE
• 7.1 TL1 Deployment Scenario
• 7.2 Need for Gateway NE
• 7.3 How GNE Works
• 7.4 Building TL1 Agent for GNE
• 8.0 Delayed Activation
• 8.1 Need for Delayed Activation
• 8.2 How delayed activation works
• 8.3 Delayed activation parameters
• 8.4 How to set the delayed activation parameters in a TL1 command
• 8.5 How to retrieve pending commands
• 8.6 How to activate pending commands
• 8.7 How to cancel pending commands
• 9.0 Security
• 9.1 Telcordia's view on security
• 9.2 Implementing Security in TL1
• 9.3 Building TL1 Agent from Security point of view
• 10.0 TL1 and OSMINE certification
• 11.0 Glossary