PSTN Products

GAO Tek’s products of Public Switched Telephone Network (PSTN) are organized as follows:

E1 Testers

GAO Tek’s E1 testers are precision instruments designed to analyze and verify the performance of E1 lines used in legacy digital transmission systems. These handheld or portable testers monitor signal integrity, check framing and signaling formats, and troubleshoot issues in real time. They support various testing modes, including loopback, BERT (Bit Error Rate Testing), and frame slip detection. 

Commonly used by telecom operators, field engineers, and maintenance teams, E1 testers are essential in network commissioning, preventative maintenance, and error diagnostics in voice and data networks using the E-carrier system. These tools are especially valuable in cross-border or inter-operator testing where synchronization and compatibility are crucial. 

Also referred to as PCM testers or E-carrier line analyzers, these instruments are designed for high performance, portability, and interface versatility. GAO Tek’s E1 testers support user-friendly displays, onboard storage, and standard-compliant testing protocols to streamline legacy network maintenance. 

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Line Testers 

Line testers from GAO Tek are used to the condition and performance of copper telephone lines, identifying issues such as shorts, opens, noise, crosstalk, and resistance faults. These handheld tools enable both basic and advanced measurements of line voltage, loop resistance, capacitance, and circuit integrity. 

They are extensively deployed by telecom technicians during field installation, repair, and network audits. Line testers are also vital for service providers and utilities to verify subscriber line quality before and after service deployment. Their rugged design makes them suitable for outdoor or central office use. 

Also known as telephone line testers, POTS testers, or copper pair testers, these devices are indispensable in PSTN maintenance. GAO Tek provides models with advanced fault localization, tone generation, and speakerphone capabilities to enhance on-site productivity. 

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PSTN Network Analyzers 

PSTN network analyzers are advanced diagnostic platforms used to assess the health, structure, and signaling protocols of circuit-switched telephone networks. GAO Tek offers compact and benchtop analyzers that decode signaling (SS7, ISDN PRI, R2) and monitor call setup, teardown, and trunk usage in real time. 

They are primarily used in telecom exchanges, NOCs (Network Operations Centers), and test labs to ensure quality of service, compliance, and troubleshooting. These tools are also valuable for VoIP interconnection testing and for carriers migrating to hybrid telephony environments. 

Often referred to as telephony protocol analyzers or voice circuit testers, these tools help ensure interoperability and service integrity. GAO Tek’s network analyzers support TDM and signaling analysis with extensive protocol decoding and reporting features. 

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xDSL Testers 

xDSL testers are field instruments that verify digital subscriber line (DSL) performance over copper infrastructure. GAO Tek provides testers for ADSL, ADSL2+, VDSL, and VDSL2 standards with features like sync speed measurement, SNR margin checks, attenuation analysis, and loop diagnostics. 

These testers are essential in broadband provisioning, fault isolation, and installation verification for DSL services. ISPs, telecom operators, and independent contractors rely on them to validate service levels and optimize DSLAM-to-customer connections. 

Also known as DSL analyzers or broadband copper testers, these units often integrate TDR (Time Domain Reflectometry), IP ping, and throughput testing. GAO Tek’s xDSL testers are engineered to handle both single-pair and bonded line testing with high precision and reliability. 

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GAO Tek Inc. provides these products and systems with robust R&D, ensuring reliability, scalability, and technical excellence to help industries achieve their goals.

Our products are in stock and can be shipped overnight to the Continental U.S. and Canada from one of our local warehouses. If you have any questions, our technical experts can help you. Please fill out this form or email us.