Have a Question?

Persistent Network Connections - Digi SureLink

Always on. Always sure. Digi SureLink® maintains persistent network connections ensuring rapid, always-on communications for devices utilizing Digi technology.

Don't Risk Downtime: Maintain Constant Network Connections

Typically, wireless connections may experience intermittence due to RF signal loss caused by fading, interference and moving obstructions. Updates and changes in the carrier network also cause devices to seemingly vanish. In most cases, the wireless device is not notified when a connection is terminated because of data inactivity – it’s just down.

Maintaining persistent mobile connections is essential in host-initiated applications. If the host tries to communicate with a remote device and the mobile link is down, the connection attempt will fail and the user is left in the dark. Customers may find that restarting their device brings the connection back up, but this is still an unreliable and inconvenient solution – one you can’t depend on when things get busy and you need to be “always on.” You need a better, more dependable way the Digi SureLink “keep-alive” function makes sure the connection will be there when it’s needed – all the time, every time.

Digi cellular products use Digi SureLink capabilities for an “always-on” connection that helps mitigate drops. A programmable inactivity timer and a pro-active link integrity function are available with all Digi cellular products; while Digi SureLink includes link integrity monitoring, with three test options.

Digi products can also be configured to send keep-alive packets from the remote device side to the network ensuring that the connection stays open and available for instant communications. Keep-alive messages from Digi devices also serve to inform Digi Remote Manager of the connection cleanup status. Furthermore, Digi products can be configured to expect keep-alive messages from Digi Remote Manager® to reestablish a connection if messages have not arrived for a user-specified period of time.

Look to Digi SureLink to make certain your connections are always up, and always on.


Always-on connections

  • Rapid on-demand communications
  • Maximizes uptime across cellular networks
  • User-configurable control for optimum performance

Inactivity timer

  • Ensures PPP connection is always available
  • Will not incur additional charges on most wireless networks
  • Device initiated

Keep-alive messages

  • Small device-initiated or Digi remote management software-initiated packets allow connection to stay up

Link integrity monitoring

  • Test options include: Ping, TCP Connection and DNS Lookup
  • Ensures two-way communication is working over WAN
  • Test at either regular intervals, or only when connection is idle
Digi SureLink
I want to stay up to date with new technologies and product updates
Subscribe to our newsletter

Related Content

Choosing the Right Cellular Solution for Your Application Choosing the Right Cellular Solution for Your Application The considerations for building an enterprise-grade network today depend upon the application requirements. These include the... WATCH VIDEO Digi IX20 Unboxing Digi IX20 Unboxing Here’s what to expect when your Digi IX20 arrives. Learn how the device is secured, right out of the box. You can also learn... WATCH VIDEO Digi IX20 – Rugged, Reliable, Flexible, Secure, Economical Digi IX20 – Rugged, Reliable, Flexible, Secure, Economical The most demanding environments require the most robust and reliable routers. Digi IX20 is not only designed for challenging... WATCH VIDEO Press Release Digi International Introduces Versatile Digi IX20 Router for Industrial, Remote Location Monitoring and for Unattended Retail and Digital Signage Applications Industrial router provides rugged, right-sized connectivity to support industrial infrastructure, critical assets, digital... READ PRESS RELEASE Connectivity Solutions for Enterprise, Industrial and Transit Applications Connectivity Solutions for Enterprise, Industrial and Transit Applications Cellular routers today must be fast, reliable, secure, configurable, manageable and 5G migration-ready, as well as programmable... WATCH VIDEO Cellular Routers, Extenders and Gateways: What Is the Difference? Cellular Routers, Extenders and Gateways: What Is the Difference? Cellular routers, extenders and gateways have similarities and differences in an IoT deployment, from managing communications... READ BLOG Cellular Failover Cellular Failover Cellular failover provides the reliable connectivity enterprises, smart cities and industrial IoT applications require for business continuity - quickly connecting to a backup connection from a... LEARN MORE Digi TX64 Digi TX64 High performance cellular router with dual redundant communications for complex transit and transportation systems VIEW PRODUCT Digi TX54 Digi TX54 Rugged and secure cellular router for mission critical industrial and transportation applications, including models for public safety networks VIEW PRODUCT Digi EX12 Digi EX12 Avoid network outages with primary or backup LTE connectivity; integrate seamlessly with existing infrastructure VIEW PRODUCT Why Failover is Essential for Business Operations Why Failover is Essential for Business Operations Many devices in the Internet of Things (IoT) do not have a backup option when their connectivity goes down during a network... READ BLOG Digi SureLink Digi SureLink DOWNLOAD PDF