Network cable repair: pinpoint diagnosis and clean re-termination
When network points stop working, intermittent slowness creeps in, or a strimmer just hit your external cable, SEG Ltd provides fast network cable repair across England. We work on Cat5e, Cat6, Cat6a, and fibre optic — and bring the right test equipment to a site visit so we don't leave guessing. Fluke DSX-5000 for copper certification, fibre OTDR for fault location on long runs, and a stocked van for re-termination, patch leads, faceplates, and basic connectivity replacement.
Common faults we fix include water-damaged external cables, rodent damage in voids and lofts, contractor strikes through walls or floors, faulty terminations causing intermittent speed-negotiation issues, damaged RJ45 modules in faceplates, broken patch panel ports, and full-channel failures where the link is just dead. We diagnose with proper test gear, document what's wrong, and fix or replace cleanly — no twist-and-tape bodges.
For long external runs where the fault could be anywhere, OTDR or TDR location tells us within a metre or so where the problem is — saving you from digging up an entire route. For internal runs we can often save the cable with a single re-termination at one end. Where a full re-run is the right answer, we do it properly: in containment, identified at both ends, certified at handover.
How we diagnose and fix cable faults
Channel test first
Before opening anything, we run a Fluke DSX channel test against TIA category spec. This often tells us not just whether the cable works but exactly which fault (NEXT, return loss, length, mapping) is breaking it.
TDR / OTDR fault location
For broken copper, TDR pinpoints the break to within a metre or two. For fibre, OTDR shows splice losses, connector contamination, and breaks along the route — enabling a targeted dig rather than a full re-run.
Clean re-termination
Where a single end is at fault, we strip, re-pin, and re-test. New RJ45 modules, new fibre connectors as required. Take the opportunity to label and tidy.
Partial or full re-run
If the cable itself is compromised — water damage, severe rodent damage, full break — we pull a new run in the same containment route, re-terminate both ends, and re-certify.
Containment repair
Trunking, conduit, tray, or external duct repair as part of the same visit. We don't leave exposed cables behind a repair "for someone else to tidy up later."
Certification & report
Post-repair Fluke certification proves the link meets category spec. PDF report stays with you — useful for warranty, IT documentation, and any future fault investigation.
How a cable repair visit works
1. Describe the symptoms
Tell us what you're seeing — link totally dead, intermittent drops, slow speeds, only one port affected, half a building affected. We'll guess the likely fault on the phone and bring the right gear.
2. Site visit & test
An engineer attends with Fluke certification gear and a stocked van. Most faults are identified within the first hour and many are fixed in the same visit.
3. Repair & certify
Re-termination, run replacement, or component swap as needed. Post-repair certification confirms the link is back to spec. Written summary with the test report.
Network cable repair FAQs
Bad terminations — either originally installed poorly, or degraded over time. They usually show up as intermittent connection drops, frequent renegotiation, or speeds locked at 100Mb on a Gigabit network. A re-termination at both ends fixes most of these in under thirty minutes per link.
Yes — that's exactly what TDR (for copper) and OTDR (for fibre) are for. We can usually locate a break to within one or two metres along the route. You then dig only at that point rather than the whole run.
Usually no. Properly installed Cat5e easily supports Gigabit and even 2.5Gb in many cases. If your existing Cat5e is failing certification or you actually need 10Gb to the desk, then Cat6a is the right upgrade — but most "we need to recable for speed" projects are actually fixing termination quality.
Yes. Damaged punch-down contacts can usually be re-terminated to the same module. If the module itself is broken, we replace the keystone or full panel as appropriate. Test before and after to confirm the fix.
Need this urgently?
For same-day diagnostic response when something is genuinely broken right now, see our Emergency Cable Repair service. Or call 0330 133 9801 and we'll triage on the phone immediately.