RDL ST-TC1 Telephone System Coupler CO Line Simulator
Special Order: typically 2–6 weeks
Ships directly from the manufacturer. This is an estimated lead time, not a guaranteed delivery date.
Availability can change and lead times may be longer. If your project has a deadline, check with us before ordering.
A member of our team will check with the manufacturer and personally reply by email.
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Key Features
- Seamlessly add paging or radio control to an on-site KSU without a dedicated CO line
- Provides a maintained relay contact closure when the simulated line is seized to trigger paging or security systems
- 600 Ω transformer-isolated audio feed for clean, isolated input/output to telephone switching units
- Passes DTMF tones for keypad-controlled paging or system access and works with ST-VOX1 for two-way radio keying
- AC-powered, US-made hardware built for reliable integration into security, surveillance, and monitoring installations
Quick Specifications
- Product Model
- ST-TC1
- Brand Name
- Radio Design Labs
- Product Name
- Telephone System Coupler
- Product Type
- Telephone System Coupler
Explore the details
Product information
ST-TC1
Overview
Add dependable paging and radio-control capability to your on-site telephone system with the Radio Design Labs ST-TC1 Telephone System Coupler. Designed to simulate a CO line into a KSU or telephone switching unit, the ST-TC1 provides a maintained relay contact closure when the line is seized — instantly activating paging, radio, or other response equipment for security, surveillance, and monitoring applications. A 600 Ω transformer-isolated audio feed delivers clean audio input/output to the switching unit and the unit reliably passes DTMF tones for keypad-controlled access. The ST-TC1 is AC-powered and intended for connection only to telephone switching equipment (not to live CO lines or lines with ringer voltage), simplifying installation while protecting your telecom infrastructure. For two-way radio or intercom integrations, pair the ST-TC1 with RDL ST-VOX1 modules to provide push-to-talk keying and full duplex control. If you need to expand paging zones, interface radios to your phone system, or add emergency monitoring triggers, the ST-TC1 offers a compact, purpose-built solution—contact us to discuss integration into your security or paging system.
Features
- Seamlessly add paging or radio control to an on-site KSU without a dedicated CO line
- Provides a maintained relay contact closure when the simulated line is seized to trigger paging or security systems
- 600 Ω transformer-isolated audio feed for clean, isolated input/output to telephone switching units
- Passes DTMF tones for keypad-controlled paging or system access and works with ST-VOX1 for two-way radio keying
- AC-powered, US-made hardware built for reliable integration into security, surveillance, and monitoring installations
| General Information | |
|---|---|
| Brand Name | Radio Design Labs |
| Manufacturer | Radio Design Labs, Inc |
| Product Name | Telephone System Coupler |
| Product Type | Telephone System Coupler |
| Application/Usage | Telephone |
| Country of Origin | US |
| Manufacturer Part Number | ST-TC1 |
| Power Description | |
| Power Source | AC Power |
| Miscellaneous | |
| Environmentally Friendly | Yes |
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Is this right for your project?
Confirm the model, required accessories and delivery needs before ordering.
- SKU:
- ST-TC1
- Manufacturer part:
- ST-TC1
How do I confirm compatibility?
Check the specifications and manufacturer documents for your existing system. Send us your model numbers and project requirements if you need help selecting equipment or accessories.
Ask a product specialistWhen will this item ship?
Availability is shown above. Special-order items and project quantities may need additional lead time. Contact us to confirm a delivery date before scheduling installation.
Shipping, freight and delivery detailsWhat should I know about returns?
Returns require an approved RMA. Consult the linked return policy for deadlines and eligibility. For standard non-defective returns, eligible factory-sealed items carry a 15% restocking fee and customer-paid return shipping; open-box and used items are refused. Defective and DOA claims follow the policy's separate terms. Special orders and other exclusions are final sale.
Read return eligibility and exclusionsRDL ST-TC1 Telephone System Coupler CO Line Simulator
ST-TC1