MS/TP over Category5 UTP
- We are seeing a growing trend in new constructions towards the use
of structured cabling. Several recent specifications in our area
have called for all Extra Low Voltage (ELV) control systems to
utilise the structured cabling system and have specifically excluded
contractors running their own cable.
To strictly adhere to the current BACnet requirements (Clause
9.2.1?) would exclude us from these projects, whereas alternate
protocols (e.g. Lon) specifically allow the use of CAT5 UTP cable.
A quick search on `EIA-485' and the use of `Cat5 UTP' cable lead me
to a website for the ESTA which contained their reports on the use
of Cat5 UTP for their protocol, which is also based on EIA-485
Their approach was to establish a working group to evaluate their
protocol over Cat5 cable. The reports contain detailed analysis and
comparisons by an independent test lab which in fact showed that in
some cases the Cat5 produced better performance.
If there was enough interest and potential benefit, could there be a
BACnet working group established to conduct a similar exercise as
the ESTA to formally evaluate MS/TP over Cat5?