50 Metre Ethernet Cable: Metric Ordering
Quick answer / TL;DR: Short answer: 50 m leaves 50 m of channel margin, so Cat5e or Cat6 carries gigabit and 2.5G comfortably; Cat6a is the choice for 10G. Order in metres and state the unit on the purchase order – 50 m is about 164 ft, and a '150 ft' substitute is 4 m short. Keep cords short and joints at zero.
A 50 metre ethernet cable uses half the channel and is the metric length that most European and Asian sites specify without thinking about feet. The engineering is ordinary; the risk is at the order desk, where a metric length is converted approximately and arrives short.
This is the 50 m guide: the channel budget, the category decision, and the ordering discipline that keeps a metric specification metric.
The Channel Budget
| The element | The figure | The note |
|---|---|---|
| Cable | 50 m | Half the channel |
| Remaining | 50 m | For cords and error |
| Joints | None | Each costs margin |
| Conversion | 50 m = 164 ft | State the unit |
Half the channel is a comfortable position: the length is long enough to cross a floor and short enough that no category is stressed.
Category at 50 Metres
- Gigabit: Cat5e or Cat6
- 2.5G/5G: Cat6
- 10G: Cat6a
- PoE: 23 AWG preferred beyond about 40 m
The category decision is about the rate and the future, not the distance.
The Ordering Discipline
| The practice | The reason |
|---|---|
| Metric on the PO | A converted figure is an approximation |
| Tolerance stated | Plus or minus a percentage |
| Unit on the label | Avoids a warehouse guess |
| Sample measured | One cord from the batch |
The sample measurement is cheap insurance against a batch that was cut in feet.
Standards and Verification
| The reference | The relevance |
|---|---|
| TIA-568.2-D | Channel definition |
| ISO/IEC 11801-1 | Metric-origin class definitions |
| IEEE 802.3 | Rates over twisted pair |
Per-SKU lengths are not provided in the knowledge base. The channel limit is 100 m; 50 m leaves half of it available.
Real-World Applications
The European fit-out
A site specified in metres: 50 m cords for the far desks, the PO written in metres with a tolerance – every position reached without an extension.
The conversion shortfall
A 50 m requirement fulfilled with a 150 ft cord: 45.7 m, four metres short of the plan. The next order stated the metric length and the unit explicitly.
The 10G decision
A 50 m run selected for 10G: Cat6 used initially and tested marginal. Cat6a fitted – at half the channel, the category was the only remaining variable.
Related reading: The channel limit in metres — blogs/news/long-ethernet-cable
Related reading: The 20 m step below — blogs/news/20-metre-ethernet-cable
Frequently Asked Questions
How many feet is 50 metres?
About 164 feet.
What category for 50 m?
Cat5e or Cat6 for gigabit and 2.5G; Cat6a for 10G.
Why specify the unit on the order?
A converted figure is approximate and can arrive short.
Does 50 m need special cable?
No – it is half the channel limit, well inside any category's rating.
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