The Tektronix ST112 SONET Transceiver Test Set Transmission Analyzer evaluates performance and compliance of SONET transceivers in laboratory and field environments. It delivers advanced signal generation and analysis across SONET and tributary interfaces, supporting critical network testing with full overhead manipulation, pointer control, and error detection capabilities.
Technical Specifications
SONET/SDH Signal Support
• SONET signals: STS×1, OC-1, OC-3, OC-12, OC-3c, OC-12c
• Payload mappings: STS-3c and STS-12c concatenated structures, DS3, VT1.5, DS1
• Framing compliance: Bellcore and ANSI specifications
• Overhead testing: Complete overhead access with Bit Error Rate Testing (BERT)
• Pointer operations: Full SPE and VT pointer control including single positive/negative justifications and NDF pointer changes
• Data Communications Channel (DCC): Add/Drop capability for D1-D3 (192 Kb/s) and D4-D12 (576 Kb/s)
• Orderwire: Local and Express handset interface
• Signal generation: Optical carrier, STS-3c/12c, DS3, and VT1.5 payload generation
Receiver and Monitoring
• STS TroubleScan: Systematic error and alarm detection across all payload envelopes
• AutoSeek/AutoLink: Automatic receive signal detection and receiver tracking
• Alarm and error monitoring: Multiple simultaneous timed alarms for regression testing
• Status indicators: LEDs for Section, Line, Path, SPE, VT, DS1, and DS3 states
• Laser classification: CLASS 1 LASER PRODUCT
Tributary Testing
• DSX-1/DSX-3 support: Independent or integrated cross-connect testing
• DS3 parameters: BPV, Parity, Bit, and Status measurements
• DS1 parameters: BPV, CRC, Bit, and Status measurements
• VT1.5 payload testing: Single or 28-channel DS1 mapping with PRBS 2²³-1, QRW, 3/24, 55 Octet, and All Ones patterns
• VT framing modes: Unframed, SF, ESF, SLC96 with Floating, Bit Asynchronous, Simplified H4 Coding, Bit Synchronous Locked, Byte Floating, and Byte Locked operations
– Key Features
• Full overhead byte access and manipulation
• VT pointer justification with positive, negative, and NDF control
• Comprehensive SONET compliance testing per industry standards
• Dual interface capability for independent tributary testing
– Typical Applications
• SONET transceiver validation and performance characterization
• Network equipment compliance verification
• Transmission path analysis and troubleshooting
• T-Carrier and virtual tributary payload evaluation
– Compatibility & Integration
Supports DSX-1 and DSX-3 interfaces for integrated or standalone tributary cross-connect testing. Operates with standard SONET optical and electrical interfaces per Bellcore and ANSI specifications.
