How Vibration, Noise and Crosstalk can Cause Downtime
November 19, 2019
Harsh Environments Require Ruggedized Products
Vibration and noise are common in industrial environments like manufacturing and rail transport. The rumble of assembly lines can interrupt data transmission and connectors can be jarred loose. Think about how much vibration occurs as a rail car travels to its destination. Environments like these require a ruggedized product.
Takeaway: Although optional, 19642-9 defines a test methodology for jacket deformation which can help to ensure long-term connector sealing performance.
Here’s a great analogy: How ridiculous would it be for a rock band to practice inside a library?
Not only would that be disruptive, it would completely prohibit regular functions. The vibration and noise inside the library would be unbearable for others working inside that space. In the case of your industrial environment, the primary result of both noise and vibration is signal loss.
This is of particular importance with Ethernet cabling due to the fact that a higher bit error rate can arise, which is detrimental in the communication network required for uptime. The impact of signal loss is more severe for higher-bandwidth applications and at higher data rates.
First, let’s break this terminology down:
- Vibration: Continuous or rapid movement. In the case of your connectors, this movement can jar connections, ultimately loosening or even completely disconnecting them – which creates a loss in signal transmission.
- Noise: Unwanted disturbance in an electrical signal, also known as interference. In the case of your cables, noise can occur when the individual layers experience vibration from an outside source (such as another machine or cable) and move relative to each other. This movement creates noise and results in crosstalk.
- Crosstalk: Unwanted transfer of signals between communication channels. In an industrial environment, there’s a lot going on at all times. Think of all the activities that happen on the plant floor at the same time – people and machines are constantly working, cutting, welding, driving and so on. Because of this, you have a lot more noise/frequencies and vibration than a typical environment. This additional noise interferes with the frequency of your connectors, switches, sensors and other devices, ultimately impacting their performance.
What Really Happens to Connectors When Exposed to Noise and Vibration?
The short answer is, if your connectors are not meant to withstand the environment they are in, they don’t work. At least, they don’t work the way you want them to. Products are manufactured to perform specific functions in specific environments.
Connectors in industrial settings need to incorporate adequate shielding protection to prevent the impact of noise. In terms of vibration, the connector needs to be designed to ensure vibration does not compromise the physical integrity of the connection. “Regular” connectors (not industrial-grade) are not created to function in areas where vibration and noise is present, resulting in data loss and even downtime.
Look for These Characteristics:
- Bonded-Pair Technology: Patented technology that helps protect cables from the impact of noise and abrasion, Belden’s bonded-pair technology prevents gaps between the twisted pairs and maintains the physical integrity of the pair.
- Shielded Cabling: In many cases with Ethernet cabling, the use of Belden Bonded-Pair technology reduces the need for an investment in shielded cabling by providing protection against noise at a lower cost. Another option is Belden’s patented Beldfoil shield technology which provides the best shield protection when compared against similar products on the market.
- M12 Ethernet Connectivity: Provides a threaded connection with IP67 (and in some cases IP69K) protection, preventing the impact of vibration jarring the connectors loose. This connectivity mates with Ethernet switches (Hirschmann OCTOPUS series) and I/O Modules (Lumberg Automation LioN-Power series). We also have a patented 100% shielding technology incorporated into the right-angle M12 connectors, which provides greater noise protection in the body of the connector.