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Learn how to choose the right FTP (foiled twisted pair) cable for data, PoE, and noisy environments. Cat5e/Cat6/Cat6A guidance, termination, testing, and local buying notes.
Choose Cat5e, Cat6 or Cat6A based on bandwidth and future needs.
FTP reduces EMI but requires correct earthing and shielded terminations.
Check stock, request VAT invoices, and buy termination accessories together.
FTP (Foiled Twisted Pair) refers to twisted-pair Ethernet cable where an overall foil shield surrounds all pairs to reduce electromagnetic interference (EMI). Choosing the right FTP cable for your project affects signal integrity, PoE capability, EMI immunity, and installation ease. This guide explains categories (Cat5e, Cat6, Cat6A), conductor sizes, screening types, connectors, and practical considerations for South African makers, students, technicians, and procurement teams.
Select the cable category based on required bandwidth, environment, and future-proofing. The table below summarises typical category performance and common use cases for FTP cable in projects.
| Category | Typical Frequency | Max Data (practical) | Use Cases |
|---|---|---|---|
| Cat5e FTP | Up to 100 MHz | 1 Gbps (typical) | Basic LAN, sensors, legacy devices |
| Cat6 FTP | Up to 250 MHz | 1 Gbps to 10 Gbps (short runs) | Higher throughput, PoE+, AV over IP |
| Cat6A FTP | Up to 500 MHz | 10 Gbps (100 m) | Data centres, long 10G links, EMI-prone sites |
For many maker and student projects a Cat5e FTP cable is sufficient and cost-effective. For projects involving high-resolution camera streams, multiple PoE devices, or future-proofing to 10G, favour Cat6 or Cat6A FTP.
FTP cables come in solid or stranded conductors. Solid conductors (typically 24 AWG solid) are better for permanent in-wall runs; stranded (e.g., 7/0.2 mm strands) is more flexible for patch cables. Check the AWG: 23 AWG has lower resistance than 24 AWG and can carry slightly more current - relevant for long PoE runs.
The foil shield reduces external noise, but it must be properly grounded at one point (typically at the patch panel or switch chassis) to be effective. Improper grounding can create ground loops or reduce shield benefit. For industrial environments with heavy motor noise or near radio equipment, FTP or individually shielded pairs (F/UTP, S/FTP) are recommended.
Practical tip: If your switch or PoE injector has an earth lug, use it when terminating FTP onto shielded RJ45 connectors and metal patch panels.
Use this checklist when choosing FTP cable for your project: distance, data rate, PoE class and current, installation environment (indoors, outdoors, conduit), mechanical stress, and budget. Below are detailed considerations with examples relevant to South Africa.
Ethernet signalling weakens over length. For standard twisted pair Ethernet, 100 metres is the widely used maximum for a single run. Longer distances require switches, fibre, or media converters. Example: a CCTV project with PoE cameras distributed across a school sports field may require fibre backhaul or PoE extenders rather than a single FTP run beyond 100 m.
Power over Ethernet transfers power and data on the same cable. Higher PoE classes increase current and heating - select cable with adequate conductor size and consider the bundle effect (many cables together increase temperature). For multiple PoE cameras on long runs, use Cat6/23 AWG or better and check device power draw in watts; convert to current using I (A) = P (W) / V (V). For example, a 30 W device on 48 V nominal is ~0.63 A (estimates). Voltage drop over long runs can reduce available power to end devices.
Use shielded RJ45 plugs and patch panels when terminating FTP. Maintain pair integrity and avoid untwisting beyond 10 mm at termination to limit crosstalk. Typical Ethernet wiring follows T568B or T568A pair order - T568B is common in South Africa installations. Example RJ45 pinout (T568B):
1: white/orange 2: orange 3: white/green 4: blue 5: white/blue 6: green 7: white/brown 8: brown
After installation, use a network cable tester to verify continuity, pair integrity, wiremap, and length estimates. For performance verification, use a NIC or tester to measure throughput and latency. If experiencing errors or dropped packets in a shielded installation, check shield continuity and single-point earthing. Common faults include split pairs, excessive untwist, poor crimping, and physical damage from staples or sharp bends (respect minimum bend radius printed on the cable sheath).
1) Home lab wired for gigabit: Cat6 FTP stranded patch leads between desk and switch, Cat6 solid FTP for short in-wall runs. 2) School CCTV: Cat6A FTP for PoE cameras and long cable runs where 10G backbone or EMI immunity is needed; use metal patch panels and single-point earth. 3) Workshop near motors: FTP or S/FTP with proper grounding to reduce noise on sensor and PLC links.
Note: examples use nominal voltages and estimated currents; all figures should be verified against device datasheets and cable manufacturer specifications. Prices and stock in South Africa (ZAR) vary by brand and reel size; request a quote for institutional procurement or VAT invoices for education purchases.
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