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The difference is how much of the product and its production the partner is responsible for—not simply whether it works in a factory. A contract assembler may build a specified board or subassembly to the equipment maker’s instructions. An electronics manufacturing services (EMS) partner may also manage production engineering, component sourcing, testing, logistics, and other manufacturing work. An original design manufacturer (ODM) may take on product design as well as manufacturing, while the brand owner retains marketing and brand development. These are useful models, not fixed contract categories: telecom companies often keep some activities in-house and outsource others.
Start with who controls the product
“Moving up the value chain” in telecom equipment manufacturing usually means taking responsibility for more than assembling a product someone else has already defined. The provider may become involved in engineering, design, procurement, quality, testing, logistics, or product development. The change is in the allocation of work, decisions, and accountability between the equipment company and its manufacturing partner.
The U.S. Department of Commerce’s 2022 Assessment of Critical Supply Chains Supporting the U.S. ICT Industry describes EMS as production managed by a contract manufacturer while the original equipment manufacturer (OEM) retains product-development control. It distinguishes ODM as a model in which the partner manages product design and manufacturing while the OEM controls marketing and brand development. These descriptions are shorthand: actual responsibilities can be blended or negotiated, and companies may provide more than one kind of service.
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Contract assembly: build to a defined design
In a narrow assembly arrangement, the customer provides a design and specifications, and the contractor builds a product or part of one. The scope might be printed circuit board assembly, a subassembly, or a larger system. “Assembly” alone does not establish who buys components, defines production tests, owns process changes, or is accountable for shipping the finished product. Those points must be set out in the agreement and operating procedures.
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The contractor can contribute practical production feedback without owning the product design. For example, it may identify a manufacturing issue or propose a process adjustment, while the customer retains authority to approve design changes. That distinction matters: providing input is not the same as owning the requirements, architecture, or final design decision.
EMS: broader responsibility for making and delivering
EMS generally describes a wider set of production services. In addition to building the customer’s design, a provider may coordinate materials, buy components, manage production, conduct tests, and arrange logistics or after-market services. The OEM can still control product development, brand, and product strategy. The label does not by itself tell a buyer which of those responsibilities the provider has accepted.
ODM: design and manufacturing in one relationship
An ODM arrangement extends further upstream by adding product-design responsibility to manufacturing. The partner may help develop the hardware or software platform and then manufacture it. The brand owner can still direct the market position, customer relationship, and branding, but product-development decisions are no longer necessarily confined to the OEM’s own team. Contracts should identify who owns or licenses design outputs and intellectual property; the available descriptions do not establish one universal ownership rule.
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The table describes common patterns, not a required industry scorecard. An individual contract can assign a task differently, or split it between parties. “Retained” means the OEM commonly keeps the decision or product authority in the model as described; it does not imply the provider has no input.
| Responsibility | Contract assembly | EMS | ODM |
|---|---|---|---|
| Product definition and design | Typically supplied and controlled by the customer; contractor builds to the defined design. | OEM generally retains product-development control in the Commerce Department’s shorthand model. | Partner manages product design and manufacturing in the Commerce Department’s shorthand model. |
| Engineering and production preparation | May include build support or production input; specific design-for-manufacturing scope must be agreed. | Can extend beyond assembly into production engineering and preparation; exact scope varies. | Can include engineering tied to product development as well as production. |
| Component sourcing and materials | May be customer-supplied or contractor-managed; the term assembly does not decide this. | May include component sourcing, material coordination, and supply-chain management. | May include sourcing and supply-chain management alongside design and manufacturing. |
| Factory work | Builds the specified board, subassembly, or product, within the contracted scope. | May manage a broader production process, from materials through system build and shipment. | Manufactures the design it helps manage or develop, subject to the specific arrangement. |
| Testing and quality | Tests and acceptance criteria need explicit assignment. | May cover production tests, quality processes, inspection, and related controls. | May span product development, manufacturing validation, and production quality. |
| Brand and market relationship | Normally remains with the equipment company; assembly alone does not confer a customer-facing brand role. | OEM typically retains product and brand control while the partner supports production. | Commerce Department describes the OEM as controlling marketing and brand development. |
The comparison is most useful as a prompt for questions, not as a way to classify a supplier by name. Ask who makes each decision, who performs each task, and who bears the consequences when a design, component, test, or delivery problem occurs.
What actually changes as a partner takes on more scope?
Product definition and engineering influence
At the assembly end, the partner mainly turns an approved specification into a physical build. As scope expands, it may be asked to improve manufacturability, develop prototypes, support engineering, or contribute to hardware and software platform development. In an ODM relationship, the role can reach product design itself. More involvement does not automatically transfer every design decision: a customer can request engineering support while keeping approval authority, or delegate particular design work while retaining control of the overall product.
This distinction affects change management. A contract should say who can initiate a design change, who evaluates its impact on cost and production, who approves it, and how the approved revision reaches component suppliers and factory instructions. Otherwise, a provider may be responsible for making a product without having clear authority over the information that determines how it is made.
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Procurement, materials, and logistics
A broader manufacturing partner may take responsibility for buying components, coordinating suppliers, managing material availability, and arranging movement of goods. That can consolidate work around production, but it also puts more operational dependencies inside the partner relationship. The OEM still needs clarity on approved parts, substitutions, forecast changes, shortages, inventory exposure, and who is responsible for communicating a delay.
Direct sourcing and partner sourcing are not always mutually exclusive. ADTRAN says it may source components directly through contract manufacturers when doing so can meet its efficiency, quality, and cost objectives. The relevant choice is therefore not “outsourcing” versus “no outsourcing” in the abstract; it is which purchasing and coordination model fits a particular product and who controls the resulting decisions.
Testing and quality accountability
Manufacturing scope can include defining or executing production tests, inspection, process controls, and responses to failed units. The equipment maker may retain product validation or acceptance authority even where the contractor performs factory testing. The contract and control documents need to distinguish test design from test execution, and routine production checks from product-level qualification.
Company examples show how specific this work can be. ADTRAN describes assembly, testing, and final inspection as manufacturing-process steps. Airgain describes contract-manufacturer coordination around control plans and final testing, as well as production part approvals and assembly instructions. Neither example creates a universal division of quality responsibility; they show why the division must be specified for the actual product and relationship.
Customer collaboration and product lifecycle
When a partner contributes to product development or manages supply-chain work, its interaction with the OEM may begin well before a production order and continue through changes, delivery, and support. It becomes a closer operating collaborator, not merely a factory paid to execute a build. The OEM may still own product strategy, marketing, brand, and end-customer access. The scope of that collaboration should be visible in decision rights and escalation paths, not inferred from a service label.
Investment and operating exposure
Broader scope can require more engineering expertise, process capability, tooling, systems, and capacity. It can also make the provider more exposed to cost overruns, quality failures, late deliveries, component shortages, and changes in customer demand. Those responsibilities can be valuable to a customer, but they are not proof of a higher margin or a better financial outcome for the manufacturer.
The 2023 interim report filed by Hon Hai with HKEX discusses competitive pricing, margin erosion, excess capacity, low utilization, and low margins in its casing and system-assembly businesses. It also describes ODM activities extending into hardware and software platform development, supply-chain management, and manufacturing optimization. This is a company-specific illustration of both broader capability and operating pressure, not a market-wide margin statistic or a guarantee about the economics of ODM work.
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Telecom companies often use a hybrid model
The change from assembly to broader manufacturing services is not necessarily a one-way handoff in which an OEM stops making products and a contractor takes over everything. A telecom equipment company may retain development and selected production while outsourcing certain builds. A partner may provide assembly for one product and broader engineering or sourcing support for another.
ADTRAN’s filings illustrate this mixed approach. The company describes manufacturing activities that include materials management, assembly, testing, final inspection, packing, and shipping. It uses subcontractors for assembly and testing of certain printed circuit boards, subassemblies, chassis, enclosures, and equipment shelves. It also says it typically makes lower-volume, higher-mix products and prototypes in-house, then may transfer higher-volume, lower-mix assemblies to subcontractors.
That choice reflects a difference in work profile, not a rule that one party should always own a particular production stage. ADTRAN notes that subcontract assembly can lengthen fulfillment cycles, while reserve capacity and flexibility can help it respond to uncertainty in orders. A company may therefore balance internal capability against partner capacity, product mix, and responsiveness rather than outsource every unit of production.
Why an OEM may keep advanced work in-house
ADTRAN says internal development on advanced technology products gives it more control over design and manufacturing issues. Its reported research and development expenditures were $204.3 million in 2025, $221.5 million in 2024, and $258.3 million in 2023. These are ADTRAN-reported company expenditures for the respective years, not a measure of spending across the telecom equipment sector or a direct comparison of outsourcing models.
Why a partner may be used for more traditional designs
ADTRAN also says it may use ODM or licensed intellectual property for more traditional designs to benefit from partner scale. This illustrates a selective approach: internal development may matter where the company wants particular control, while partner capabilities may be suitable for other products. It does not establish that one model is inherently more innovative, economical, or appropriate for every telecom product.
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A contract manufacturer can assume factory tasks without removing the customer’s need to govern the relationship. Airgain’s description of its manufacturing relationships includes compliance, raw-material supply and cost, production part approvals, assembly instructions, control plans, testing, and on-time shipping. It cautions that qualifying and implementing a new contract-manufacturer relationship can be time-consuming and costly.
For an OEM, qualification and ongoing oversight remain important even when the partner has broad operational scope. The OEM needs a way to approve processes and changes, monitor supply and quality, and resolve issues that cross the boundary between product design and production. Simply transferring assembly work does not transfer every business or product risk.
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Agree on decision rights, not just task lists
A useful agreement says not only who performs an activity, but also who has authority to make the associated decision. For example, component procurement can be assigned to a partner while the OEM retains approval of the bill of materials. A contract manufacturer can run a test while the OEM defines pass criteria. A partner can recommend a design adjustment while the brand owner approves the revision.
For each activity, document the accountable party, approval owner, required records, change-control route, and escalation process. This helps avoid gaps in which both parties assume the other is handling a supplier, test failure, or production deviation.
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A practical way to evaluate the scope
When comparing a narrow assembly arrangement with an EMS or ODM proposal, use the same questions for every potential partner. The answers matter more than the label on a capabilities page.
- Product definition: Who owns requirements, product architecture, and hardware or software design? Who approves design changes and controls the released product definition?
- Engineering: Is the partner expected to provide design-for-manufacturing input, prototype work, production engineering, or product development? Which deliverables and approvals belong to each party?
- Procurement and supply chain: Who selects and buys components, approves alternatives, manages suppliers, forecasts materials, and arranges logistics? Who is responsible when supply availability or cost changes?
- Manufacturing scope: Is the work board assembly, subassembly production, full-system integration, or volume manufacturing? Which steps remain at the OEM or another supplier?
- Testing and quality: Who defines tests and acceptance criteria, performs production testing and inspection, controls process quality, and leads failure investigation or corrective action?
- Capacity and flexibility: Who funds or reserves capacity, bears utilization risk, and responds when forecasts change? How do lead times and production transfers affect fulfillment?
- Commercial and customer role: Who owns the brand and end-customer relationship? How are cost, delivery, product decisions, and accountability allocated between the OEM and provider?
Then map each response to the actual product and its lifecycle stage. A company might use in-house development for a high-mix prototype, a contractor for a selected assembly, and a broader partner role for a mature, higher-volume product. The same supplier can occupy different positions in those arrangements.
What the labels do—and do not—tell you
EMS and ODM are useful terms for describing a direction of travel: from executing production toward managing more of the production system, and potentially into design. They do not establish a standardized package of services, a universal allocation of intellectual-property rights, or a guaranteed economic benefit. There is no market-wide margin premium established for moving from assembly into design or engineering; outcomes depend on the particular program, investment, scale, utilization, competition, costs, and execution.
For telecom buyers, the practical question is whether the proposed partner can take on the specific work the product requires without obscuring decision authority. For manufacturing providers, broader scope means demonstrating and sustaining capabilities beyond build execution, while accepting the operational accountability attached to them. In either case, define the work, decision rights, and risk allocation in the relationship rather than relying on the term “value chain” to do that work.
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