Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your RadioShack 4-Pin Modular Telephone Jack. This surface-mount jack is designed for 1 or 2 line telephone installations and is compatible with RJ11 and RJ14 connectors.
Setup and Installation
The RadioShack 4-Pin Modular Telephone Jack is designed for easy surface mounting on a wall or baseboard. Follow these steps for proper installation:
- Select Location: Choose a suitable, clean, and dry surface for mounting the jack. Ensure the location allows for easy access to existing telephone wiring if applicable.
- Prepare Wiring: If connecting to existing telephone wiring, ensure power is disconnected before handling wires. Strip the ends of the telephone wires (typically 2 or 4 wires) according to the jack's internal connection points.
- Connect Wires: Open the jack casing. Connect the telephone wires to the corresponding terminals inside the jack. Refer to standard telephone wiring color codes (e.g., green/red for line 1, yellow/black for line 2) for correct polarity. This jack supports 1 or 2 line installations (RJ11/RJ14).
- Mount the Jack: Secure the jack to the chosen surface using appropriate screws (not included) through the designated mounting holes. Ensure it is firmly attached.
- Close Casing: Carefully close the jack casing, ensuring no wires are pinched.
- Test Connection: Once installed, connect a telephone to the jack and test for a dial tone and proper functionality.

Image 1: Front view of the RadioShack 4-Pin Modular Telephone Jack, showing the RJ11/RJ14 port for telephone cord connection.
Operating Instructions
Using the RadioShack 4-Pin Modular Telephone Jack is straightforward:
- Connect Telephone Cord: Insert one end of a standard RJ11 or RJ14 telephone cord into the modular port on the jack.
- Connect to Device: Connect the other end of the telephone cord to your telephone, modem, or other compatible communication device.
- Verify Connection: Ensure both ends of the telephone cord are securely seated in their respective ports.
Maintenance and Care
To ensure the longevity and optimal performance of your telephone jack:
- Cleaning: Wipe the exterior of the jack with a soft, dry cloth. Avoid using liquid cleaners or abrasive materials, as these can damage the casing or internal components.
- Environment: This jack is suitable for both indoor and outdoor usage. However, for outdoor installations, ensure it is protected from direct exposure to extreme weather conditions to prevent damage.
- Inspection: Periodically check the jack and connected cords for any signs of wear or damage. If damage is observed, replace the affected components.
Troubleshooting
If you experience issues with your telephone connection, consider the following:
- No Dial Tone:
- Ensure all telephone cords are securely plugged into the jack and the telephone device.
- Verify that the telephone line is active and not experiencing an outage.
- Test the telephone device with another known working jack or line to rule out a device issue.
- Check the internal wiring connections within the jack to ensure they are secure and correctly polarized.
- Intermittent Connection:
- Inspect the telephone cord for damage or frayed wires. Replace if necessary.
- Ensure the jack is firmly mounted and not loose.
Specifications
| Brand | RadioShack |
| Model Number | 279-0203 |
| Connector Type | RJ11 / RJ14 |
| Color | White |
| Connector Gender | Male-to-Male (for internal wiring, jack itself is female) |
| Unit Count | 1 Count |
| Indoor/Outdoor Usage | Indoor, Outdoor |
| Item Weight | 1.6 ounces |
| Product Dimensions | 5.5 x 3.9 x 1.1 inches |
| UPC | 040293709198 |
Warranty Information
Specific warranty details for the RadioShack 4-Pin Modular Telephone Jack are not provided in this manual. For information regarding warranty coverage, terms, and conditions, please refer to the product packaging or contact the retailer or manufacturer directly.
Customer Support
If you require further assistance or have questions not covered in this manual, please contact RadioShack customer support or the retailer from whom you purchased the product. Keep your purchase receipt and product model number (279-0203) readily available when seeking support.





