Larsen & Toubro
Website:
larsentoubro.com
Job details:
The TMMS & VoIP System Designer is responsible for the design, engineering, integration, testing, and maintenance support of Telecommunications Maintenance Management Systems (TMMS) and Voice over Internet Protocol (VoIP) systems for railway, metro, airport, and infrastructure projects. The role ensures reliable communication, centralized monitoring, fault management, and maintenance of telecom systems in compliance with project specifications and industry standards. Suitable for Railway, Metro, Airport, Data Centre, and Critical Infrastructure Telecommunication Projects.
Key Responsibilities -TMMS Design & Engineering
- Develop Telecom Maintenance Management System architecture and design.
- Define monitoring and control requirements for telecom subsystems.
- Design interfaces between TMMS and telecom systems, including:
- CCTV
- PA/PIDS
- Telephone Systems
- Radio Systems
- Transmission Networks
- Access Control Systems
- Network Equipment
- UPS Systems
- Develop alarm management and event logging functionalities.
- Configure SNMP-based network monitoring and management solutions.
- Prepare telecom asset management databases and maintenance workflows.
VoIP System Design
- Design IP-based telephony architecture and network topology.
- Define SIP-based communication requirements.
- Configure and integrate:
- IP-PBX Systems
- SIP Servers
- Media Gateways
- VoIP Phones
- Softphones
- Voice Recording Systems
- Develop dial plans, numbering schemes, and call routing strategies.
- Ensure interoperability with legacy telephone systems and emergency communication systems.
Integration & Interface Management
- Coordinate with signalling, SCADA, AFC, ICT, and telecom teams.
- Define interface requirements between TMMS, VoIP, and other railway systems.
- Support integration activities during system implementation and commissioning.
- Resolve communication and network interoperability issues.
Testing & Commissioning
- Prepare Factory Acceptance Test (FAT) procedures.
- Support Site Acceptance Testing (SAT).
- Conduct functionality, performance, and redundancy testing.
- Verify alarm reporting, fault management, and call quality requirements.
- Support troubleshooting during commissioning and operations.
Documentation
Prepare And Maintain
- System Design Documents (SDD)
- Telecom Architecture Drawings
- Interface Control Documents (ICD)
- Network Diagrams
- Bill of Materials (BOM)
- Configuration Documents
- Testing Procedures and Reports
- Operation & Maintenance Manuals
Compliance & Quality
- Ensure compliance with project specifications and telecom standards.
- Follow cybersecurity requirements for telecom and IP-based systems.
- Support RAMS activities and system reliability assessments.
- Participate in design reviews and audits.
Educational Qualification
Essential
- Bachelor's Degree in:
- Electronics & Communication Engineering
- Telecommunications Engineering
Preferred
- Master's Degree in Telecommunications, Networking, or Systems Engineering.
Experience
Designer / Engineer
- 8-15 years of experience in telecom system design and integration.
- Experience in railway, metro, airport, smart city, or infrastructure projects preferred.
Senior Designer / Lead Engineer
- 8+ years of experience in telecom systems engineering.
- Experience in managing telecom design and integration activities.
Technical Skills
TMMS
- Telecom Maintenance Management Systems
- Network Management Systems (NMS)
- Fault Management Systems (FMS)
- SNMP Monitoring and Configuration
- Alarm and Event Management
- Asset Management Systems
VoIP
- IP Telephony Architecture
- SIP Protocol
- RTP/RTCP
- VoIP Network Design
- IP-PBX Systems
- Session Border Controllers (SBC)
- Voice Recording Systems
- Emergency Telephone Systems
Networking
- TCP/IP
- VLAN
- VPN
- Ethernet Switching
- Routing Protocols
- Cybersecurity Fundamentals
- Network Redundancy Design
Knowledge of Standards
- ITU-T Recommendations
- IEEE 802.3 Ethernet Standards
- SIP (RFC 3261)
- IEC 62443 Cybersecurity Standards
- ISO 27001 Information Security
- EN 50121 (EMC for Railways)
- EN 50126 (RAMS)
- IEC 61375 (where railway network integration is required)
Preferred Tools
- Cisco Unified Communications Manager (CUCM)
- AVAYA IP Office
- Unify/OpenScape
- 3CX
- Asterisk
- Wireshark
- SolarWinds NMS
- PRTG Network Monitor
- ManageEngine OpManager
- AutoCAD
- Visio
- DOORS / Polarion
Key Competencies
- Telecom System Engineering
- VoIP Network Design
- Troubleshooting and Problem Solving
- Technical Documentation
- Stakeholder Management
- Interface Coordination
- Communication Skills
- Quality and Compliance Focus
Typical Deliverables
- TMMS Architecture and Configuration Documents
- VoIP System Design Documents
- Interface Control Documents (ICD)
- Network Architecture Drawings
- IP Addressing Plans
- Device Configuration Sheets
- Alarm & Event Mapping Matrix
- FAT/SAT Procedures and Reports
- O&M Manuals
- As-Built Documentation
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