Introduction
This guide explains what Customer Premises Equipment (CPE) is, why CPE checks matter, how to carry them out, the most common issues you may find, and the troubleshooting steps support agents or customers can follow.
Issue description
CPE checks help identify whether a customer's on-site equipment is causing a service issue, such as no connection, poor performance, intermittent drops, or failed provisioning. This article is designed to help diagnose and resolve CPE-related problems quickly and consistently.
What is CPE?
Customer Premises Equipment (CPE) refers to any device located at the customer's site that connects to or supports the service. Examples may include routers, modems, gateways, set-top boxes, VoIP handsets, switches, and wireless access points.
Why CPE checks are important
CPE checks are important because they help isolate whether a fault lies with the customer's equipment, local wiring, configuration, or the wider network. They can reduce unnecessary engineer visits, speed up resolution times, and improve first-contact support outcomes.
Signs of a CPE-related issue
- No internet or service connection
- Frequent disconnections or unstable service
- Slow speeds compared with the expected service level
- Device lights showing an error state
- Unable to access the device admin page
- Calls, TV, or other services not working as expected
Prerequisites
- Customer account details and service address
- CPE make and model, if available
- Access to the device, cables, and power supply
- Any recent fault history or change notes
How to perform a CPE check
Step 1: Confirm the device details
Confirm the CPE type, model, serial number, and current status. Check whether the device is customer-owned or supplied by [Product/service name].
Step 2: Check power and physical connections
Verify that the device is powered on and that all cables are secure. Inspect power adapters, Ethernet leads, fibre connections, telephone cables, and any splitters or filters for damage or loose fittings.
Step 3: Review indicator lights and alarms
Compare the device lights or alarms with the manufacturer's normal operating pattern. Note any red, amber, flashing, or absent lights, as these may indicate a fault or loss of signal.
Step 4: Confirm connectivity and access
Test whether the device can reach the network and whether the customer can access the internet or service applications. If available, check the device admin interface for status, logs, and error messages.
Step 5: Restart the CPE
Perform a controlled restart of the device. Allow enough time for the CPE to fully reboot and resynchronise before testing the service again.
Step 6: Compare results with the expected service
Check whether the service now matches the expected performance, speed, and stability. If the issue remains, continue with troubleshooting and escalation as needed.
Common issues found during CPE checks
| Issue | What it may mean | Suggested action |
|---|---|---|
| No power | Failed power supply, unplugged adapter, or faulty socket | Check power source, replace adapter if available, test another socket |
| No signal or sync | Line fault, disconnected cable, or service outage | Inspect cabling, confirm line status, escalate if needed |
| Intermittent drops | Overheating, weak signal, or unstable configuration | Improve ventilation, reboot device, review settings |
| Slow performance | Wi-Fi interference, congestion, or outdated firmware | Test wired connection, reduce interference, update firmware |
| Configuration error | Incorrect credentials, VLAN, or service profile | Review settings and reapply the correct configuration |
Basic troubleshooting steps
- Confirm the device is powered on and connected correctly.
- Restart the CPE and wait for it to fully reconnect.
- Check for damaged cables, loose connectors, or incorrect ports.
- Test with a known-good cable, power supply, or handset if available.
- Check device status lights and note any error codes.
- If possible, connect a device directly to the CPE using Ethernet to rule out Wi-Fi issues.
- Verify the customer's configuration, login details, and service profile.
- Escalate to network support if the CPE appears healthy but the service still fails.
Advanced troubleshooting steps
Step 1: Check device logs and status pages
Review the CPE logs, uptime, WAN status, signal levels, and error messages. Look for repeated reboots, authentication failures, or loss-of-signal events.
Step 2: Verify firmware and configuration
Confirm the device is running the approved firmware version and that the configuration matches the customer's service. Reapply the correct profile if required.
Step 3: Isolate the fault
Swap components one at a time, such as the power supply, cable, or CPE, to identify the failing element. If the fault follows the device, the CPE may need replacement.
Step 4: Escalate where necessary
If the issue cannot be resolved locally, escalate with full notes, including test results, device details, logs, and any actions already taken.
Tips and best practices
- Always record the device model, serial number, and observed symptoms.
- Use a consistent checklist so checks are repeatable and easy to audit.
- Avoid factory resets unless authorised, as they may remove customer settings.
- Check for environmental issues such as heat, dust, or poor ventilation.
- Where possible, test both wired and wireless connections to separate CPE and Wi-Fi issues.
Next steps
If the CPE check resolves the issue, monitor the service and confirm stability with the customer. If the issue remains unresolved, raise a fault ticket or arrange further diagnostics with [Support team / Network operations].
Additional information
Related resources: [Link to CPE status guide], [Link to service outage checker], [Link to escalation process]. Replace these placeholders with your organisation's internal articles or tools.
Disclaimer
This guide is intended for general support use only. Always follow your organisation's approved procedures, safety requirements, and vendor instructions. If you are unsure about any step, seek assistance from a qualified technician or senior support agent.