For a permanent Ethernet cable run in a wall, terminate the cable on a compatible keystone jack, then snap the jack into a matching wall plate. Use the wiring map printed on the jack, follow that model’s instructions for stripping and punching down, and test the completed run. A keystone jack uses insulation-displacement contacts (IDC); it is not terminated like a modular plug on a patch lead.
What you need—and which termination to use
A keystone jack is the usual endpoint for a permanent in-wall run. It mounts in a compatible wall plate or surface-mount box. A modular plug is typically used at the end of a loose equipment lead; fitting one requires a plug and crimp tool compatible with the cable. The procedures below are for low-voltage Ethernet cabling. Do not handle mains conductors in the same box or cavity.
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| Termination | Typical use | Contact and tool | What to check |
|---|---|---|---|
| Keystone jack | Permanent cable run at a wall outlet | IDC contacts; use the tool specified by the jack, often a 110-style punch-down tool | Jack compatibility with cable category and construction; wall-plate fit |
| Modular plug | Loose patch or equipment lead | Plug contacts; use a compatible crimp tool | Plug compatibility with cable conductor type and gauge |
Before starting, read the cable jacket and the jack’s product instructions. Confirm the jack supports the cable category and construction, and whether it is tool-based or tool-less. Have a compatible wall plate, jacket stripper, and cable tester ready. Tool and preparation requirements differ by product: Legrand’s Techchoice instruction sheet specifies a 110 blade tool and recommends its stripping tool; Leviton’s Cat5e/Cat6 jack instruction sheet specifies a 110-style impact tool set to low impact. Follow the instructions for your exact jack rather than applying one brand’s dimensions or settings to another.
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Choose T568A or T568B
Check the wiring scheme used at the other end of the run or follow the project specification before cutting or seating any conductors. T568A and T568B are both eight-conductor maps; they differ by exchanging the orange and green pair positions. For a conventional straight-through link, use the same scheme at both ends. Neither scheme is inherently better for this job; consistency with the existing installation is what matters. Oracle’s cabling guidance likewise advises against mixing A- and B-terminated horizontal cables and patch cords.
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For reference, T568B pins 1–8 are white/orange, orange, white/green, blue, white/blue, green, white/brown, brown. T568A swaps the orange and green pair positions. This is pin order, not a promise that colors appear left-to-right in every jack diagram. Jack orientation and labeling vary, so use the A or B color chart printed on your actual jack, not an unlabeled photo or a guessed connector orientation.
How to terminate the cable at the keystone
- Prepare the cable according to the jack instructions. Remove only the required amount of outer jacket, taking care not to nick conductor insulation. Strip lengths are model-specific: Legrand’s Techchoice sheet calls for 2 inches, while Leviton’s cited sheet describes about 3 inches during preparation and then keeping the jacket within 1/8 inch of the jack side. Do not combine these into a universal measurement.
- Arrange the pairs using the selected chart. Route each colored conductor to its matching IDC slot on the jack’s T568A or T568B diagram. Keep each pair twisted as close to the contact as practical. Legrand specifies maintaining pair twists within ½ inch (13 mm) of the termination point; Leviton specifies less than ½ inch. Avoid untwisting more cable than needed to reach the slots.
- Seat the conductors with the correct method. For a punch-down jack, use the specified blade and settings. Leviton directs installers to position the tool perpendicular to the jack and set it to low impact. Seat each wire fully in its IDC slot and trim it as the jack design requires. For a tool-less model, follow its own closure and seating directions instead of using punch-down steps.
- Fit supplied covers or caps. If the jack includes a dust cap, stuffer cap, or wire-management cover, install it as directed. Product-specific instructions may include a particular lacing sequence: Legrand, for example, directs installers to lace from the center toward the outside, terminate all four pairs on a solid flat surface, fit the stuffer caps, then snap its module into the faceplate or surface-mount box. Those details apply to that product family, not automatically to every jack.
Install the jack in the wall plate
- Check the jack for an orientation mark such as “UP” and position it accordingly.
- Snap the jack into a wall plate or surface-mount box designed to accept that jack family. Keystone products are not automatically interchangeable across every product family; if the jack will not seat or the plate will not close, verify compatibility rather than forcing it.
- Secure the plate at the outlet. Keep this work limited to low-voltage cabling; do not handle mains wiring in the same box or cavity.
Test the completed run
Test the full run after termination, including both ends. A basic Ethernet cable tester can check continuity and wiremap, helping reveal an open conductor, short, reversal, or misordered wire. If the map fails, inspect both ends for a wrong color slot, an incompletely seated conductor, damage, or an A/B mismatch; correct the termination and test again.
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A simple continuity or wiremap pass does not certify that a link meets a high-performance category specification. If the project requires category certification, use appropriate certification equipment. A visually tidy arrangement alone does not establish performance.
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Troubleshoot common problems
- No link or failed wiremap: Check both ends for an incorrect color slot, an open conductor, or an unintended T568A/T568B mismatch. Re-terminate both ends to the selected scheme as needed.
- Intermittent connection or lower-than-expected performance: Check for nicked insulation, excessive untwisting, poorly seated IDC contacts, a jack or plug incompatible with the cable construction, and physical cable damage.
- The jack will not fit the plate: Confirm that the jack and wall plate are from compatible product families; do not force the fit.
- You only need to terminate a loose equipment lead: Use a compatible modular plug and crimp tool. Punch-down jack instructions do not apply to a plug.
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