What Is Above Network Management – Service Management & Business Management – TMN Logical Model Explained

In one of our previous post, we explained the network hierarchy starting from bottom as Network Element -> Element Management System (EMS) -> Network Management System (NMS). We also explained how EMS and NMS are different entities and what the role of each of them is. This post focuses explaining TMN logical model by describing layers above Network Management i.e. Service Management and Business Management. Continue reading

What Is Monitored Under Fault Management in Network Management

This post focuses on various parameters/information that are monitored via management system for Fault Management. Fault Management aids in finding issue with network elements or management system and enables operators to find our the root cause and rectify them. Here we are discussing the type of information that is monitored for fault management. Continue reading

Difference Between CLI and TL1 Interface

CLI stands for Command Line Interface and TL1 stands for Transactional Language 1. Well, let we first clarify that it is wrong to say that there is a difference between CLI and TL1. Then why we kept the title that says so? Well, we have lot of readers coming in searching for difference between CLI and TL1 and we wanted to ensure that they land here and see the information provided for their benefit…!! Okay, fair enough, what we would like to call it as? We would like to call it as – TL1 exposes CLI. Let us now understand how. Continue reading


Simple Network Management Protocol i.e. SNMP is a simple request/response protocol in which SNMP manager communicates with SNMP agents/managed devices using SNMP PDU’s (Packet Data Unit). There are 7 types of SNMP PDUs which are used by SNMP manager to manage SNMP agents. Continue reading

FCAPS in Network Management

FCAPS is an acronym for Fault, Configuration, Administration/Accounting, Performance,  and Security. A network manager’s ability or rather responsibility is to maintain and administer a computer network. Network management is the execution of the set of functions required for planning, allocating, Continue reading

SNMP Errors, Their meaning and How to correct them

In case of erroneous conditions, SNMP PDU sent by agent in response to an SNMP request contains error status and error index. SNMP Error status indicates the cause of error whereas error index indicates the field/attribute that caused the error. Various SNMP error stauts, their meanings and way to correct them is as follows: Continue reading