Switching for Small and Medium-Sized Companies
TL;DR β¨
This article is a simple guide to choosing a switch for a small or possibly medium-sized business. It explains selected concepts for end users and beginning IT enthusiasts who need a quick solution to a straightforward situation.
The physical layer covers running cables, crimping connectors, and linking devices. UTP Cat 5e with RJ45 connectors is sufficient for the systems discussed. The conductor order is striped orange, orange, striped green, blue, striped blue, green, striped brown, brown.
This article is a simple guide to choosing a switch for a small or possibly medium-sized business. It explains selected concepts for end users and beginning IT enthusiasts who need a quick solution to a straightforward situation.
1. The ISO/OSI Model¶
The model has seven layers; the first two matter here.
1.1 Ethernet Cabling¶
The physical layer covers running cables, crimping connectors, and linking devices. UTP Cat 5e with RJ45 connectors is sufficient for the systems discussed. The conductor order is striped orange, orange, striped green, blue, striped blue, green, striped brown, brown.
Source: http://www.zapojeni-internetoveho-kabelu.cz/
Correctly crimped cabling should work reliably. Bad terminations and physical damage can be found with a cable tester. Solid conductor is easier to terminate; stranded cable is useful where it moves frequently. Permanent cabling is best terminated in data outlets and patch panels.
1.2 Switching¶
Every endpoint has a MAC address such as AA:BB:CC:DD:11:22:33:44. A hub repeats incoming traffic to every port. A switch initially asks every port for the destination, but after learning it, forwards subsequent traffic only to the correct port. It stores MAC-address-to-port mappings internally and refreshes them periodically. Compared with hubs, this reduces unnecessary traffic and the opportunity for interception.
2. Hardware on the Market¶
The article considers representative switches that originally cost less than CZK 5,000.
2.1 TP-Link TL-SF1005D¶
The TL-SF1005D was a basic home switch costing about CZK 200. It connected up to four systems, but offered low throughput and no management. The author preferred a remotely manageable MikroTik where possible, even an inexpensive RB950r2 hEX lite.
2.2 Zyxel GS1100-16¶
The GS1100-16 offered 16 Gigabit ports for under CZK 2,000 but was still unmanaged, preventing remote administration and cable diagnostics. The manufacturer did not publish a block diagram, so its actual throughput limits remained unclear. The author argued that a manageable switch from a transparent vendor would usually repay its extra cost by avoiding one future on-site service call.
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2.3 MikroTik CRS326-24G-2S+RM¶
The CRS326-24G-2S+-RM was a popular SOHO/SME model costing about CZK 4,000.
It was remotely manageable and supported dual boot between SwitchOS and RouterOS. MikroTik's switching hardware had limitations, but its price-to-value ratio was strong and the vendor published the relevant architecture.
Ports 1-8, 9-16, and 17-24 form groups that transfer internally without using the switch chip. Traffic between groups crosses a one-Gigabit bottleneck. A transfer from port 5 to 16 therefore shares capacity with a simultaneous transfer from port 6 to 18. This design kept the switch affordable for SOHO and SME customers, but buyers needed to understand the limitation.
3. Conclusion¶
The examples range from CZK 200 to CZK 5,000 and target SOHO and SME environments where that infrastructure budget is realistic. The article's purpose is not to cover every switch feature, but to explain the basic distinctions and trade-offs.