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Updated: Sep 11, 2026
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Nortel 920-551 Exam Overview:
| Certification Vendor: | Nortel |
|---|---|
| Exam Name: | GSM BTS 18000 Installation and Commissioning |
| Exam Number: | 920-551 |
| Available Languages: | English |
| Certificate Validity Period: | 2 years |
| Exam Format: | Multiple Choice |
| Exam Duration: | 90 minutes |
| Real Exam Qty: | 75-80 |
| Exam Price: | Not officially listed (legacy exam) |
| Passing Score: | 70% |
| Sample Questions: | Nortel 920-551 Sample Questions |
| Exam Way: | Proctored exam at authorized test centers (originally Prometric) |
| Pre Condition: | Basic knowledge of GSM networks and radio access systems; relevant field experience recommended |
Nortel 920-551 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Hardware Verification and Initialization | 20% | - Power-on sequence and checks - Firmware loading and initialization - Hardware status verification |
| System Overview and Architecture | 20% | - GSM BTS 18000 system structure - Hardware components and modules - Network interfaces and connectivity |
| Site Preparation and Installation | 25% | - Antenna and feeder installation - Mechanical installation procedures - Site requirements and safety guidelines - Power supply and grounding installation |
| Testing, Troubleshooting and Maintenance | 10% | - Fault diagnosis and troubleshooting - Preventive maintenance procedures - Functional and performance testing |
| Commissioning and Configuration | 25% | - Baseband and signaling configuration - Integration with BSC and core network - Radio frequency configuration - Local and remote access setup |
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