API Reference
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First-Time LTE Setup Guide

Clear, step-by-step instructions to get LTE working on your SynLink PDU for the first time.

Prerequisites

  • 3FF (micro) SIM card — Registered & activated with a data plan.
  • APN (Access Point Name) from your SIM provider (required).
  • (Optional) Public / Static IP assigned to the SIM — if you want direct inbound access to the PDU. This usually costs extra from carriers.
  • SynLink LTE PDU
  • Antenna
  • A laptop on the same LAN as the PDU for initial web UI configuration (or console access if required).

1. Hardware installation (safe physical steps)

  1. Power off the PDU (remove mains power).

  2. Open the SIM tray, insert the micro SIM until it clicks, and close the cover.

    • Important: Never insert or remove a SIM while the PDU is powered — this can damage the modem or SIM.

  3. Attach the antenna to the external antenna port. Tighten finger-tight — do not over-torque.

  4. Power on the PDU.

2. Initial network access

You’ll configure LTE from the PDU web UI (recommended first-time flow). Make sure you can reach the PDU over Ethernet:

  1. Connect the PDU's Ethernet port to your local network or laptop switch.
  2. Allow the PDU obtain an IP via DHCP or set a Static IP using the front panel interface.
  3. Open a browser and go to the PDU IP address (e.g., https://192.168.1.100).
  4. Log in with your admin credentials.

3. Configuring LTE via Web Interface

Navigate: Network → LTE


  1. Enable Cellular Function (toggle switch).

  2. Fill in required fields:

    • APN — from your SIM provider.

    • LTE Connection Policy — choose one:

      • LTE-Primary — prefer LTE; use Ethernet only if LTE fails.
      • LTE-Fallback — prefer Ethernet; use LTE when Ethernet is down.

    • Connection Test IP Address — a stable IP to ping (default recommendation: 8.8.8.8). The PDU uses this to evaluate WAN health.

    • Override DHCP Assigned DNS — enable if you want LTE DNS to supersede DHCP when LTE is active.

    • Primary / Secondary DNS — provide reliable DNS servers for when LTE is active (e.g., 8.8.8.8, 8.8.4.4).

  3. Save the configuration.

  4. On the LTE page, click Refresh / Status. Look for:

    • Registration status: Registered (good)
    • Signal Strength and Quality (ensure usable signal)

  5. If Registered, you’re ready to use LTE. If not, see troubleshooting below.

4 Access & Management — Recommended: Synaccess Central Management Portal (CMP)

Summary: The recommended way to access and manage your LTE PDU is via Synaccess Central Management Portal (CMP). It’s simple, secure, and requires no special carrier setup, VPNs, or public IPs — just pair the device with your CMP account and manage it from the Management Portal.

Why Central Management Portal is recommended

  • No router or carrier configuration required on site.
  • Minimal on-site networking changes — works with typical site network setups.
  • Centralized monitoring, alerts, and remote management (reboot, config, status) in one place.

Quick pairing & validation (field friendly)

  1. Configure LTE on the PDU (APN, LTE policy, DNS) as described in Section 3.
  2. Pair the PDU with your Synaccess CMP account: https://synaccess.readme.io/reference/connect-a-synlink-pdu
  3. In the CMP UI, confirm the PDU appears online.
  4. From an off-site device, verify you can view/manage the PDU in the CMP UI.

Short checklist

  • PDU configured with correct APN and LTE policy.
  • PDU paired to Synaccess CMP (pairing guide above).
  • PDU visible and manageable in CMP UI.
  • Alerts configured for connectivity and health.

Other access options (brief)

There are alternative ways to reach the PDU (for example: assigning a public IP to the SIM or using a carrier private network). These options require extra carrier involvement, may incur additional cost, and typically need coordination with Synaccess and your SIM provider — please reach out to [email protected] to discuss the details of these options.

4. Troubleshooting

Symptom — “LTE Status And Configuration” shows no information

Possible causes

  • SIM card not registered / not activated by the carrier.
  • SIM requires a network reset or re-provisioning by the carrier.
  • APN missing or incorrectly entered.
  • Antenna disconnected, loose, or placed where signal is blocked.

Step-by-step checks & fixes

  1. Confirm the SIM is active with the carrier

    • Verify the SIM has an active data plan and that carrier provisioning is complete. If the carrier requires activation steps (web portal, SMS, or support call), complete those first.

  2. Power-cycle safely

    • Power off the PDU, wait 5–10 seconds, then power back on. Re-check LTE status.
    • Do not insert/remove SIM while the PDU is powered.

  3. Reseat the SIM (power off first)

    • Power off the PDU, open the SIM tray, confirm SIM is seated correctly (you should hear/feel a click), close tray, power on. If the SIM tray or card looks damaged, try a known-good SIM.

  4. Check signal & antenna

    • Verify the antenna is attached and finger-tight. Move the antenna to a less obstructed location if possible (higher, away from large metal surfaces). Low signal will prevent registration.

  5. Collect basic diagnostics for support

    • Take a screenshot or photo of the LTE Status page (include timestamps).
    • Record: PDU model & firmware version, sim card, carrier and APN configured.
    • Download the diagnostics log from the Web Interface under Logging->Diagnostics.
    • Send diagnostics information to [email protected]

Quick cause → action mapping

  • SIM not registered → Contact carrier to confirm activation; confirm APN; power-cycle PDU.
  • SIM needs re-provisioning / network reset → Ask carrier to reset/re-provision the SIM; power-cycle PDU after carrier confirms.
  • Antenna loose or mis-positioned → Power off, tighten antenna, reposition for better line-of-sight, power on and re-check.