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Manufacturing & factories: A2P SMS and mobile data

Factories online from the first shift.

Unicom Americas – Mobile Business team

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In figures

  • Production-line SIM activation (贴卡/写号) happens during assembly: the card is personalised with its IMSI and ICCID, the authentication keys are written, and the device leaves the line already provisioned for its destination market.
  • A plant link carries three different things: supervisory telemetry, office traffic and video. Keeping them on separate private APNs is what stops a control network from sharing a broadcast domain with the office LAN.
  • Industrial protocols such as Modbus TCP, OPC UA, PROFINET and EtherNet/IP were designed for a local bus; they cross cellular through a gateway that knows the polling pattern and can buffer when the link drops.
  • Closed-loop motion control stays on the wired bus. Cellular fits supervisory telemetry, remote maintenance and non-safety monitoring, where a second of delay does not move a machine.
  • A production-line test needs a real attach, not just a profile write: the identity on the card has to match what the destination network expects, or the failure appears at the customer's site instead of at the factory.

This page is not legal advice.

Scenarios

Plant connectivity

Primary and backup links for plants, warehouses and yards, sized from the application mix rather than headcount. Start with the traffic that must not stop: the MES and ERP sessions, the quality-image uploads, the access-control and CCTV streams. Then decide which of them may fail over to cellular and which must wait, because a backup link that silently carries the wrong traffic is worse than none. Dual-SIM routers, a second path and a defined failback rule make the design testable; a link that has never failed over in a drill has not been tested.

Industrial gateways

A gateway turns a bus of PLCs and sensors into one managed connection. It polls Modbus registers or browses OPC UA nodes, packs the values into a small payload and publishes them to the plant platform, buffering locally when the link drops. That store-and-forward behavior is the difference between a gap in a chart and a gap in production data. Keep office browsing off the gateway, allow only outbound sessions to the platform, and give maintenance engineers a named path rather than a shared password. The private APN and the gateway policy are the two controls that keep operational traffic separate.

Production-line SIM activation

SIM provisioning on the line covers writing the identity, testing an attach and packing the device with the right profile for the market it ships to. The order matters: the ICCID and IMSI are fixed during personalisation, the authentication keys are written once, and the test attach confirms that the destination network accepts them. Devices built in one country and sold in several others need the profile decided before assembly, not after arrival. The device export guide covers the market-by-market checks that sit around the line test.

Remote maintenance and OT support

Machine builders and integrators need to reach a PLC after handover without opening a port to the internet. The usual pattern is an outbound tunnel from the plant gateway to a maintenance service, with per-session approval, a time limit and a recording. Cellular fits that path because it can be independent of the plant's own IT network, but it must not become a second uncontrolled entrance. Name who may open a session, log every session, and make the tunnel expire by default rather than waiting for someone to close it.

Multi-site rollouts

A manufacturer rolling out the same line in several plants is shipping a template: the same gateway, the same polling map and the same profile family, with site-specific addresses and access rules layered on top. Standardize the hardware and the test script, keep a spare unit per site, and record which device identity went to which plant so a replacement can be provisioned before the old one is removed. Sites with unreliable power need the router and the gateway on a UPS, or the connectivity plan is only as good as the supply behind it.

Product bundle

MIIT provisions apply to the China leg of plant connectivity; specifics are scoped with your counsel. The connectivity design and the filing question are separate workstreams, and both start from the applications and sites involved.

FAQ

Do you provision SIMs on our line?
Yes. Profiles are written and tested during assembly against the destination market's requirements. Bring the personalisation data and the test plan, and we scope the line step with your contract manufacturer.

How do plant networks stay separate from office IT?
Gateways aggregate operational traffic onto private APNs; office traffic never mixes with it. The gateway policy allows outbound sessions only, and maintenance access runs through a named, logged path.

What about MIIT rules for the China leg?
Cross-border connectivity is provided for your company's internal use. We help you scope ICP filing and data-transfer steps with your counsel; this is not legal advice.

Does cellular replace the plant network?
No. Keep safety functions and closed-loop motion control on the wired bus, and use cellular for supervisory telemetry, remote maintenance and the backup path. A design that depends on the mobile link for a stop function is the wrong design.

How do we test a line before shipment?
Write the profile, attach to the destination network in a test location or with a roaming test profile, then sample the batch rather than testing only the first unit. Record the ICCID and IMSI per device, so a field failure can be traced back to the line step.

Sources

  1. ITU-T G.8011: Ethernet private line services
  2. MIIT Circular [2017] No. 32 (via CAC): cross-border lines

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