CasestudyNetwork Operations Management

SDH Network Monitoring

By October 16, 2019 December 26th, 2023 No Comments

SDH Network Monitoring

A Case Study on topology-driven network event correlation for root cause analysis in a multi-vendor SDH network

Operational Requirements

Customer’s network consisted of several multi-vendor EMS instances to monitor SDH network in different regions of country. Locating the root cause of a fault required scanning through EMS screens and manual correlation. Customer wanted to reduce the fault location time from hours to almost real time


  • Analysis of fault events from multi-vendor EMS and present mode of fault management operations
  • Analysis of network topology and its representation in inventory systems
  • Analysis of various SDH fault scenarios

Solution Delivered

  • Normalization of alarm objects at NMS level across multi-vendor EMS that sent alarms over TCP/IP, SNMP or CORBA
  • Single SDH network alarm view for the whole multi-vendor network
  • Automation of inventory interface for topology information
  • Development of correlation rules to pinpoint root cause alarm and suppress redundant alarms
  • End-to-end testing to demonstrate successful functioning of rules

Value Proposition

  • Accurate modeling of rules due to domain knowledge
  • Hundreds of alarms from the network due to a fiber cut were suppressed within 30 seconds to display the root cause problem


  • SDH, PSTN, SNMP (v1 and v2c), CORBA TMF814, TCP/IP
  • HP-UX, Solaris, MS-Windows 2000
  • Shell, Perl
  • Navis NFM, VitalSuite NFM, DNA, TNMS, T2000, WS-NMS, OMS
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