IP-basierte Gebäudetechnik
More and more building technology services and applications are receiving an IP connection
More and more building technology services and applications are receiving an IP connection: video surveillance, access control, time recording, lighting, heating, ventilation, air conditioning, shading, WLAN, systems for cordless telephones and cell phones (DAS), sensor networks, ... the list is growing almost daily. DIN EN 50173-6 for distributed building services standardizes the cabling required for this.
Digital Ceiling
In addition to WLAN access points, LED lights and their controls, sensors for temperature and brightness and presence detectors - all with an IP connection - are often installed in the ceiling, which has led to the term "digital ceiling". As sensors and their cabling can be easily installed in suspended ceilings, digital ceilings are an important component of smart building applications. Universal, application-neutral cabling for all applications enables devices to be replaced easily and economically.
End-to-end cabling
It is not always practical to connect devices to sockets with patch cables. Just think of cameras in security areas or access points in lobbies: patch cables are a nuisance at best and a security risk at worst. With RJ45 plugs, which are mounted directly onto the laid cable, there is no need for junction boxes and patch cables. In German, the term "end-to-end cabling" is used for this, in English "end-to-end link" or "modular plug terminated link (MPTL)". Important: In order to be able to correctly measure a section that ends in a plug, appropriate measuring adapters are required. Channel adapters are not suitable for this, as they hide the first and last plug connection of a route.
Single Pair Ethernet (SPE)
Four pairs of wires are not always required to connect sensors or devices. Single Pair Ethernet (SPE), which uses only one pair of wires, is an interesting alternative that saves space and money. SPE should enable data rates of 10 Mbit/s, 100 Mbit/s and 1 Gbit/s. The standardization work on this has not yet been completed; variants are or will be standardized in
IEEE 802.3cg (10 Mbit/s) IEEE 802.3bw (100 Mbit/s)
IEEE802.3bp (1 Gbit/s)
IEEE802.3ch (2.5, 5 and 10 Gbit/s), planned for mid/end 2020
Depending on the data rate, the cable lengths are 15 m, 40 m and 1000 m; depending on the variant, up to ten plug connections per cabling section should be possible.
Power over Data Lines (PoDL)
SPE also allows the terminal devices to be powered via the data cable, so that no separate power connection is required. This is particularly important for small components such as sensors and actuators. Although the underlying technology is related to the familiar Power over Ethernet (PoE), it is not compatible, as PoE requires at least two pairs of wires. To avoid confusion between the two, a new name was chosen: Power over Data Lines, or PoDL for short.
PoDL is standardized according to IEEE 802.3bu. In standard operation, terminal devices have up to 50 W available at a current of typically up to 1360 mA.
