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NetCon 101 Part: 3 – Edition 9 (V 2.6+) vs. Pre Edition 9 (earlier than V 2.6)

Back before UL revision 9 came out the NetCom values  read 0 to 7. 0 being the best and 7 the worst. After the UL Revision 9 changes  the NetCon values changed to  5 to 7.  5 is the best 7 is worst.    A NetCom 5 is needed to pass a fire inspection. The detailed explanation is below. 

A Subscriber developed before the UL 864 9th Edition Compliant models calculate NetCon differently than the later. Edition 9 compliant Subscribers begin at firmware version 2.6+. The firmware version features typically follows all models. If another model is released with a version 2.6+ or higher, it would include the basic Subscriber functions as any other at that version with specific model variations added as needed. Version 2.6+ was designed to operate in a MultiNet environment and still be able to use NetCon 5 to indicate at least two unique paths exist in the current Routing Table all the way to the MultiNet Receiver/7705i.Earlier firmware than 2.6 was developed around the Single RF head end receiver concept, where they would report their NetCon as 0 if the #1 ID in the Routing Table was reporting a Link Layer/Level (LL) of 0.

RF Head End devices such as the 7003, 7703 or a 7170 IP-Link, are the only devices that can report LL as 0. A pre-V 2.6 Subscriber would report itself as a NetCon of 0, because the ID at the top of the list is a LL 0. In other words, if the #1 ID in the list is the single Stand Alone Receiver, it reports NetCon as 0.A V 2.6+ or higher does not report a NetCon of 0 with a LL as 0 in the #1 position. This prevents the reporting of NetCon 0 when a single IP-Link is at the top of the list. Two IP-Links are required to establish a NetCon of 5. Two IP-Links would in fact constitute two unique paths all the way to the 7705i. A third IP-Link would provide three unique paths, but NetCon would still be calculated as 5 adhering to the Edition 9 algorithm’s rules.

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Updated: September 11, 2016 — 1:32 PM
  • I haven’t had a chance to scroll through all your posts yet but you should do one on the difference between the 7788F-ULP and the 7788F-ULP-P radio units and the difference with the 7788F-ULP-P adding the 7762 card and 7740 local annunciator. Which by the way – what are your thoughts on the 7740 local annunciator trouble annunciation on the subscriber units? It doesn’t meet NFPA 72 technically as it doesn’t resound every 24 hours like a fire panel.

    • I have been working on more post. I did not even think about your suggestions I will do more aes stuff in the near future i also plan on doing videos. Right now I have been busy with school I am working on getting linux red hat certified.

    • I haven’t had much experience with the annunciators but what i do like about them is if you silence them while they are reporting a trouble or something and the trouble restores it will sound to let you know it’s silenced. Dallas is adopting the new fire codes for 2016 and they are getting really strict about fire installs. they want instant local notifications for everything now even ac fails. the national fire code allows for ac fail and low batt delays but Dallas don’t care lol.

  • We sell a ton of AES radio’s – I was formerly a service manager now I am at a different LV contractor in sales so I LOVE your posts as most techs don’t keep up on this!

    • i never expected anyone to comment on my aes post so thanks for commenting made my day 🙂

      • Well, sadly I think I may be about thee only person in Minnesota right now who knows what you are talking about when posting about AES radios. I have come across so many in the last few years that are done completely wrong. I just saw one last week where they hardwired a smoke directly to zone 1, a pull to zone 2, and a waterflow to zone 3. IT IS NOT A CONTROL UNIT IT IS A COMMUNICATOR! GRRRR! Or my other favorite lately is finding them halfway across the building from the FACU with just a phone line ran from the FACU’s DACT to the 7794 Data Capture Card on the AES.. when questioned, “that’s how you need to do it now for UL”. I guess people cannot read these days as it is clear as day it must be in the same room and within 25′ of FACU in full conduit. Not only that, the 7794 is Listed for supplementary fire not primary, that is why they added the 7795 kit which includes the 7794, 7762, 7740. Oh boy, I think my eyes roll about 1000x a day! Minnesota has a fairly ridiculous and strict State Fire Code as well in comparison to other states, or so I have heard. I have not been doing this long, actually only been in the industry 5 years and not as a tech. I graduated college with a bachelor’s in business operations but found myself blindly thrown into being the Service Manager and UL ASC Rep only a month into my temp job at a LV contractor. 5 years ago I probably couldn’t even tell you what “Fire Alarm System” was. I have really latched onto this industry for some reason and love it but do not love the other contractors who do half-a$$ installs. I hope to one day move to the other side of the fence and become a compliance auditor for someone like UL. Good luck with your linux red hat certification. I am unfamiliar with what that is but will google it. Have you done any NICET? I have Level II for Special Hazards, Fire Alarm and Inspection and Testing of Fire Alarm. I passed level III for Special Hazards but don’t meet the years experience requirement. I am looking into getting my CFPS certification through NFPA. I want to relocate to FL by 30, I have about 3 years to go til I hit 30 but I want to get as Certified and professionally recognized as possible to help find the best employer in a relocate.

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