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Understanding Power Backup Needs in OLT/ONU Architectures

Fiber access networks built on OLT (Optical Line Terminal) and ONU (Optical Network Unit) infrastructure depend on continuous, stable DC power to maintain service continuity for subscribers. When local power grids experience interruptions, voltage drops, or unstable conditions, both central-office-side equipment and customer-premises devices such as routers, ONTs, modems, gateways, and CPE units are at risk of rebooting or shutting down. According to the industry background shared by Shanghai Mylion New Energy Co., Ltd. (brand name MYLION, http://www.myliontech.com), these power interruptions can directly increase service complaints, customer churn, and field maintenance costs for telecom operators and Internet Service Providers.

Because OLT and ONU equipment often operate on different voltage architectures — with central and access network equipment frequently requiring higher DC voltage input while customer-side ONT and router devices typically run on standard 12V rails — a single generic backup power product rarely fits the entire network chain. This is why MYLION positions itself as a specialized Mini DC UPS and telecom BBU (Battery Backup Unit) solution provider, focused on compact, safe, and project-ready backup power systems for broadband, fiber, ISP, telecom, and network infrastructure applications.

Matching Backup Power to Real Device Requirements

Rather than offering a one-size-fits-all UPS, MYLION’s core value proposition centers on application matching: helping telecom operators, ISPs, and network equipment suppliers keep customer-side devices online during power failures by providing compact DC UPS and BBU solutions matched to real device voltage, current, connector, runtime, and safety requirements. For OLT/ONU deployments specifically, this matching process typically considers:

• Real device operating voltage and working current, rather than relying solely on adapter label ratings
• Startup surge current, which can be significantly higher than steady-state load
• Required backup runtime target for the specific network segment
• Connector type and cable configuration for correct device compatibility
• Installation environment, including space constraints near ONTs or fiber terminal boxes
• Certification and safety documentation needs for the target market

This project-based model selection approach is designed to help customers avoid wrong model selection, insufficient runtime, connector mismatch, and unsafe overload conditions — issues that can be especially costly when scaled across a large ONU deployment base.

Product Architecture for Different Points in the OLT/ONU Chain

MYLION’s product matrix reflects the layered voltage architecture found across OLT/ONU networks.

Customer-Side ONU/ONT and Router Backup

For the subscriber-facing side of the network — where ONTs, routers, modems, gateways, and CPE devices typically operate on 12V DC — MYLION offers its 12V Standard Mini DC UPS Series (models MU68, MU26, MU48). These units include a built-in lithium battery pack with BMS protection against overcharge, over-discharge, overcurrent, and short circuit, housed in a compact form factor suitable for desktop, wall-mounted, or customer premises installation. For FTTH environments where space near the ONT or fiber terminal box is limited, the Inline FTTH Mini UPS Series (model MUJ46) provides an ultra-compact, cable-style inline design that connects directly between the original power adapter and the device, reducing installation complexity compared with traditional desktop AC UPS products.

Higher-Load Gateway and Advanced CPE Backup

Some advanced gateways, WiFi gateways, and broadband CPE devices draw more current than standard low-current Mini UPS models can support. For these cases, MYLION’s High-Power 12V Telecom BBU Series (models MU35, MU65) is designed for 12V high-load applications, with larger battery capacity options for longer backup time and evaluation of actual working current, peak current, adapter rating, and load behavior before model confirmation. This helps prevent scenarios where an under-rated backup unit causes device restarts or shutdowns during customer testing.

Central and Access Network Equipment Backup

For OLT-side and access network equipment that does not use standard 12V input, MYLION’s 24V / 48V DC Backup Power Series (model MU248) provides backup power options for selected 24V and 48V DC equipment, including wireless CPE, communication terminals, and small access network devices. This DC-side backup architecture is intended to help reduce the size and conversion loss associated with traditional AC UPS systems, while supporting evaluation of device voltage, current, power consumption, connector, and installation environment.

Long-Cycle-Life and Modern Power Architectures

For customers prioritizing extended cycle life and thermal stability, particularly in long-term standby applications common to always-on network segments, MYLION offers the LiFePO4 Mini UPS Series (model ML1202AC), built on LiFePO4 battery chemistry with built-in BMS protection. As network equipment increasingly transitions toward USB-C Power Delivery architectures, the USB-C PD Mini UPS Series (model MUC85) addresses backup power needs for devices using USB-C PD input rather than traditional DC barrel connectors.

Quality, Compliance, and Project Delivery Considerations

Backup power reliability across an OLT/ONU network depends not only on product selection but also on manufacturing discipline and documentation. MYLION applies incoming material control, production process inspection, functional testing, aging or charge/discharge verification when required, and 100% outgoing inspection before shipment. For international telecom and ISP projects, the company supports certification-related documentation — including CE, FCC, RoHS, UN38.3, MSDS, and IEC 62368-related evaluation depending on the specific model and project requirement — along with product specifications, test reports, user manuals, and packing information. Because certification availability may vary by product model and final configuration, MYLION notes that certification scope for customized projects should be confirmed according to the final approved version.

A Project-Based Approach to Network-Wide Backup Power

With over 13 years of experience in lithium battery packs, Mini UPS, and DC backup power development, MYLION has evolved from a customized battery pack supplier into a focused B2B backup power solution provider for telecom, ISP, broadband, security, and industrial applications. For organizations designing an OLT/ONU power backup architecture, this means access to a structured project workflow — from requirement analysis and model selection through sample testing, technical confirmation, certification coordination, production, inspection, and shipment. MYLION also supports OEM/ODM cooperation, including private labeling, customized connectors, cables, capacity adjustment, and project-specific documentation, allowing telecom operators, ISPs, system integrators, and distributors to build a consistent backup power product line across the different voltage tiers present in a typical fiber access network, from the OLT and access equipment down to the ONU and customer premises router.

http://www.myliontech.com
Shanghai Mylion New Energy Co.,Ltd.

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