--- title: "Siemon: Leveraging Existing TERA® Links for Single-Pair Ethernet" description: Did you know that existing 4-pair TERA permanent links can also be easily retrofitted to create 375-meter SPE-ready links? image: https://www.accu-tech.com/hubfs/2017%20Redesign%20Vendor%20Banners/white%20blue%20fiber%20light%20with%20patch%20cords.jpg --- {% set baseFontFamily = "Open Sans" %} /* Add the font family you wish to use. You may need to import it above. */ {% set headerFontFamily = "Open Sans" %} /* This affects only headers on the site. Add the font family you wish to use. You may need to import it above. */ {% set textColor = "#565656" %} /* This sets the universal color of dark text on the site */ {% set pageCenter = "1100px" %} /* This sets the width of the website */ {% set headerType = "fixed" %} /* To make this a fixed header, change the value to "fixed" - otherwise, set it to "static" */ {% set lightGreyColor = "#f7f7f7" %} /* This affects all grey background sections */ {% set baseFontWeight = "normal" %} /* More than likely, you will use one of these values (higher = bolder): 300, 400, 700, 900 */ {% set headerFontWeight = "normal" %} /* For Headers; More than likely, you will use one of these values (higher = bolder): 300, 400, 700, 900 */ {% set buttonRadius = '40px' %} /* "0" for square edges, "10px" for rounded edges, "40px" for pill shape; This will change all buttons */ ### After you have updated your stylesheet, make sure you turn this module off [Click to Contact Sales](https://www.accu-tech.com/contact-us) | Call Corporate Office at [888-222-8832](tel:18882228832) [![Accu-Tech logo with tagline in navy blue](https://www.accu-tech.com/hs-fs/hubfs/Accu-Tech%20Blue%20Tagline%20300px%20-%20Edited.png?width=300&height=95&name=Accu-Tech%20Blue%20Tagline%20300px%20-%20Edited.png "Accu-Tech logo with tagline in navy blue")](https://www.accu-tech.com/) # Siemon: Leveraging Existing TERA® Links for Single-Pair Ethernet by **[Bobby Salerno](https://www.accu-tech.com/accu-insider/author/bobby-salerno)** on December 18, 2020 In a previous [blog](https://blog.siemon.com/infrastructure/tera-an-existing-proven-and-standards-based-solution-for-single-pair-ethernet-spe), Siemon covered how their fully-shielded TERA cabling system with its cable sharing capabilities, noise immunity and transmission headroom is ready to support single-pair Ethernet (SPE) deployments for low-speed building control, industrial and other network connections, with guaranteed support of IEEE 802.3cg 10BASE-T1L up to 400 meters. [![Siemon logo](https://www.accu-tech.com/hs-fs/hubfs/Siemon%20logo.png?width=256&name=Siemon%20logo.png)](https://www.accu-tech.com/vendors/siemon)But did you know that existing 4-pair TERA permanent links can also be easily retrofitted to create 375-meter SPE-ready links? Yup, that’s right. If you already have existing 90-meter 4-pair TERA links, you can add additional connectors, as well as extend your existing infrastructure another 310 meters (285 meters of solid cable and 25 meters of 26 AWG stranded single-pair cordage) to support SPE devices. Let’s take a closer look at how to do that. ### An Easy Extension To accomplish this, one or more TERA EOs and/or SCP outlets can be added after the existing EO or SCP outlet, up to 285 meters away. From the final EO, use single-pair TERA patch cords to connect up to four SPE devices. Device connections can be achieved using cords fitted with 1-pair TERA plugs on one-end and traditional screw terminal interface connections or single-pair pluggable equipment connections on the other. Just make sure your patch cords at both ends don’t exceed 25 meters, for a total channel length of 400 meters. The following example depicts a retrofit for an access control network with SPE keypad, exit button, wall reader and electronic door strike. This would be an ideal scenario for a facility that was precabled with 90-meter 4-pair TERA permanent links (either to an EO or SCP outlet) when the network was installed but now needs to extend TERA SPE cabling to support low-speed access control devices out in a warehouse. [![Infrastructure Diagram ](https://blog.siemon.com/infrastructure/wp-content/uploads/2020/12/20-12-tera-llinks-for-single-pair-ethernet.jpg)](https://blog.siemon.com/infrastructure/leveraging-existing-tera-links-for-single-pair-ethernet) If your existing TERA links terminate to TERA SCP outlets in a zone enclosure, and you prefer the zone cabling benefits of simplified labelling and administration and shorter, easy-to-manage links, you can even deploy a second zone enclosure housing SCP outlets. From the TERA SCP outlets in the second zone enclosure, you can then deploy single-pair TERA cords to devices or extend 4-pair category 7A/class FA cable to a TERA EO, as long as the total permanent link does not exceed 375 meters and the channel doesn’t exceed 400 meters. [Continue reading](https://blog.siemon.com/infrastructure/leveraging-existing-tera-links-for-single-pair-ethernet) [Learn more about Siemon](https://www.accu-tech.com/vendors/siemon) [Learn more about Accu-Tech](https://www.accu-tech.com/?__hstc=248374744.b000c45e502c129e4bbd2e3b8dee345d.1607437866825.1608312163240.1608316509399.20&__hssc=248374744.60.1608308191446&__hsfp=1251123509) - [Tweet](https://twitter.com/share) Topics: [Siemon](https://www.accu-tech.com/accu-insider/topic/siemon) [ethernet](https://www.accu-tech.com/accu-insider/topic/ethernet) ### Subscribe To Our Blog ### Additional Information ### About Accu-Tech Accu-Tech is a national distributor of Voice, Data, AV, Wireless, and Security solutions. We partner with best-in-class manufacturers to provide the integrated, future-proof solutions our customers require. From project services and management to on-the-job-site logistics, Accu-Tech ensures every customer’s project is supported from design to completion. 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