Stable network links for building automation systems
Stable network links for building automation systems
Hello everyone. I work for a local municipality handling heating systems. Currently, we use networks for every new installation. Typically, connections inside buildings are made via Cat7 cables, while between buildings we use OM3/4. The bandwidth requirements are minimal, and what matters most is reliability and long-term stability. The equipment around these systems is built to last about 25 years. I'm seeking a quick review: is Cat7 sufficient or is it excessive? Many suggest switching to single-mode now, but aren't lasers more susceptible to wear? What do you think about low-bandwidth networking over the long run? Thanks in advance!
The advantage of cat7 isn't worth it; using cat6a or cat6 makes more sense since speeds rarely exceed 100 Mbps. Opt for shielded twisted pair cables instead. Cat7 might offer some extra protection, but it also brings a lot of plastic and weight, which isn’t needed at such low rates. OM3 and OM4 fiber can travel quite far, but armored cables are usually better. Laser connectors tend to last longer than standard jacks. You might also find ethernet cables treated with rodent repellents to keep animals away.
the "cat" isn't crucial unless you prioritize speed; focus on durability instead. choosing all fiber offers benefits but comes with drawbacks like higher expenses and potential fragility over time. however, a key benefit of CAT7 is its robust shielding, creating a durable cable that resists interference effectively. it's smart to integrate cabling into the building's network setup—let the professionals manage connectivity so you can concentrate on other needs.
Cat7 offers excessive protection. While it adds shielding against interference, the voltage and distance needed to cause issues typically stay within electrical code guidelines. Unless cables are close to 480V+ and the circuit has many noisy devices like heavy machinery or power tools, Cat7 won’t deliver extra value. Opt for 6A instead if budget allows. For short runs, Cat8 is better since it follows official standards and uses compatible connectors. This is new information; I don’t have solid data to support it. Personally, in settings with a high ratio of SM to MM (95/5), MM optics fail much more often than SM ones. There’s no clear MTBF comparison between SM and MM, but since SM fiber has dropped and SM is cheaper, many switch to SM. This simplifies inventory, adds flexibility, and avoids the need to redo fiber every time. I’ve seen enough customer cases where equipment would have failed long ago if we relied on “proper” setups or just harsh conditions. Automation and telemetry have limited impact on performance. Stick with straightforward cabling—ensure proper installation so connections last decades. As with any design, the best path is boosting resilience and adding redundancy. On the network side, focus on keeping communication uninterrupted during failures and having backup routes for critical links. MM/SM fiber isn’t as brittle as you think; just avoid bending or pinching it too much, but even minor stress can harm the cable over time. Copper (especially CCA) is more susceptible than SM/MM fiber.