--- title: High Precision Clock in beroNet PRI and E1 Modules, solution for DECT description: In environments with DECT it is highly recommended to use the beroNet PRI module with its highest precision clock. image: https://blog.beronet.com/hubfs/beroNet_HPC_blog.jpg --- - [How to buy](https://www.beronet.com/where-to-buy/) - [beroNet Wiki](https://beronet.atlassian.net/wiki/display/PUB/beroNet+Documentation) - [Downloads](https://beronet.atlassian.net/wiki/display/PUB/Tools+and+Downloads) - English - [Deutsch](https://blog.beronet.com/de) - [Français](https://blog.beronet.com/fr) Search: [![beroNet GmbH](https://blog.beronet.com/hubfs/beroNet_August2017/Images/130920_Logo_beronet.png "beroNet GmbH")](https://www.beronet.com/) # High Precision Clock in beroNet PRI and E1 Modules, solution for DECT - [Home](https://blog.beronet.com) - High Precision Clock in beroNet PRI and E1 Modules, solution for DECT - [Tweet](https://twitter.com/share) **What is a "High Precision Clock" and what do I need this for?** ![beroNet_HPC_blog](https://blog.beronet.com/hs-fs/hubfs/beroNet_HPC_blog.jpg?width=400&name=beroNet_HPC_blog.jpg)The term "high precision clock" refers to the precision of the oscillator installed on the E1 or PRI modules. These oscillators have a given accuracy which is defined in ppm (parts per million). The lower this value the better. **beroNet PRI modules and beroNet E1 modules have a precision of 2.5 ppm** (beroNet E1 modules before mai 2021 have a precision of 50ppm).   These oscillators are used when the ISDN Gateway or Session Border Controller are used to connect a traditional PBX to a VoIP System. In this case the ISDN Gateway or SBC will be the clock-master and the ISDN PBX will derive its internal clock from the beroNet device. This is normally fine, unless the PBX uses DECT handsets. These are not connected to the PBX to derive their timing from it, so they must have an internal oscillator with high precision to match the precision of the PBX. But when the PBX has only a low precision, due to deriving it from the Gateway or SBC, the quality of DECT calls will decrease. Even sometimes not work at all. **In such environments, beroNet modules with their high precision give guarantee of calls with the highest quality.** beroNet E1 modules with high precision clock are available under references "BNMO-1E1" and "BNMO-2E1" and integrated in some standard configurations. beroNet PRI modules with high precision clock and additional T1 interface are available under references "BNMO-1PRI" and "BNMO-2PRI". All modules can be at will integrated in Gateways and SBC base models.   For further information please check out [beroNet product catalog](https://www.beronet.com/support/resources/#tab-1568720737305-5-8).   Category: [VoIP Gateways](https://blog.beronet.com/tag/voip-gateways), [All-IP](https://blog.beronet.com/tag/all-ip), [migration](https://blog.beronet.com/tag/migration), [ISDN shutdown](https://blog.beronet.com/tag/isdn-shutdown) [By beroNet GmbH](https://blog.beronet.com/author/beronet-gmbh) [December 03, 2020](https://blog.beronet.com/author/beronet-gmbh) [Leave a comment](https://blog.beronet.com/high-precision-clock-pri-modules#comments-listing) ### Author: beroNet GmbH [Previous Previous post: beroNet Appliance: Replacing the PSTN Phone System with an IP PBX](https://blog.beronet.com/replacing-the-pstn-phone-system-with-an-ip-pbx) [Next Next post: beroNet announces distributor partnership with Sitec in UAE](https://blog.beronet.com/beronet-announces-announces-distributor-partnership-with-sitec-in-uae) [![New Call-to-action](https://no-cache.hubspot.com/cta/default/2182707/59b266d9-f534-4106-98d2-d76b7e836f30.png)](https://cta-redirect.hubspot.com/cta/redirect/2182707/59b266d9-f534-4106-98d2-d76b7e836f30) ### Subscribe to Email Updates ### Categories - [beroNet News (36)](https://blog.beronet.com/tag/beronet-news) - [Unified Communication (12)](https://blog.beronet.com/tag/unified-communication) - [change (4)](https://blog.beronet.com/tag/change) - [Business Tips (3)](https://blog.beronet.com/tag/business-tips) - [Classic Telephony (3)](https://blog.beronet.com/tag/classic-telephony) ### Recent Posts - [About](https://www.beronet.com/about/) - [Contact](https://www.beronet.com/contact/) - [Careers](https://www.beronet.com/careers/) - [Press](https://lp.beronet.com/press) - [Where to buy](https://www.beronet.com/where-to-buy/) - [VoIP Gateways](https://www.beronet.com/voip-gateways/) - [Session Border Controller](https://www.beronet.com/gateway/session-border-controller/) - [Telephony Appliance](https://www.beronet.com/gateway/telephony-appliance/) - [beroNet PCI(e) VoIP Cards](https://www.beronet.com/gateway/pcie-voip-card/) - [Failover Switch](https://www.beronet.com/gateway/failover-switch/) - [beroNet Accessories](https://www.beronet.com/voip-gateways/beronet-accessories/) - [Partners & Distributors](https://www.beronet.com/where-to-buy/) - [Provider Partners](https://www.beronet.com/partner-program/provider-partners/) - [Technology Partners](https://www.beronet.com/partner-program/technology-partners/) - [Become a Partner](https://www.beronet.com/partner-program/) Search the Blog Search [![beroNet GmbH](https://blog.beronet.com/hubfs/beroNet_August2017/Images/footer-logo.png "beroNet GmbH")](https://www.beronet.com/) Copyright © 2017 beroNet GmbH, Germany Made in Berlin - [Legal / Impressum](https://www.beronet.com/legal-impressum/) - [Privacy Policy](https://www.beronet.com/privacy-policy/) - [Disclaimer](https://www.beronet.com/disclaimer/) - [Terms and Conditions / AGB](https://www.beronet.com/terms-and-conditions/) ![](https://www.facebook.com/tr?id=116575599076830&ev=PageView&noscript=1) ![](https://dc.ads.linkedin.com/collect/?pid=232889&fmt=gif)