Overview
Dual-path System Enhancement Module (LTE/Ethernet) provides Alarm.com reporting with cellular and IP paths for enrolled PowerSeries panels.
Reporting path
Alarm.com LTE + Ethernet dual-path
At a Glance
| Detail | Value |
|---|
| Product type | Alarm communicator / reporting module |
|---|
| Model family (SEM Dual Path LTE/Ethernet) | See label and install manual |
|---|
| Reporting path | Alarm.com LTE + Ethernet dual-path |
|---|
| Primary manual | System Enhancement Module Dual Path (LTE/Ethernet) Spec Sheet |
|---|
| Region / listing notes | US/CAD spec sheets in manifest — confirm regional SKU |
|---|
Before You Install or Replace One
- Confirm exact model number on the communicator label matches the install manual.
- Verify host panel family — Keybus PowerSeries, Neo Corbus, MAXSYS Combus, IMPASSA integrated, or universal dialer-capture are not interchangeable.
- Confirm monitoring receiver and account accept this communicator format (Contact ID, SIA, IP, cellular).
- Check carrier/network generation (3G sunset, LTE band, Ethernet path) for your region.
- Add communicator current draw to panel battery standby calculation where the module loads from panel bus power.
Official Sources
- System Enhancement Module Dual Path (LTE/Ethernet) Spec Sheet — DSC official documentation
Error Codes
Communicator faults appear on the host panel trouble display ([*, 2] on keypads where supported) and in DLS/dealer tools — the communicator itself may show LED status per its install manual.
Common communicator troubles
| Panel / display | Meaning | First checks |
|---|---|---|
| FTC / Failure to Communicate | Report did not reach central station | Account, path, format, receiver online |
| Alt. Comms AC / Battery | Communicator power fault | Module power wiring, panel AUX budget, battery size |
| Alt. Comms FTC | Alternate path failed | Test primary and backup paths separately |
| Cellular registration / SIM | Module cannot register on mobile network | SIM active, APN, RSSI, antenna placement, carrier sunset |
| T-Link Network Fault | IP path cannot reach network | LAN cable, router, firewall, receiver IP |
Dual-path SEM (LTE + Ethernet)
- Path failover requires both SEM IP and SEM LTE programmed — single-path test must pass each leg.
Dual-path SEM (LTE + Ethernet)
| Leg | DLS status field |
|---|---|
| SEM IP | T-Link/network fault |
| SEM LTE | Registration / RSSI |
Failover requires both legs programmed and passing individual tests.
LED / module diagnostics
Refer to System Enhancement Module Dual Path (LTE/Ethernet) Spec Sheet for communicator-specific LED patterns and DLS module status screens.
Source: Host panel install manual § communicator / alt-comms troubleshooting; System Enhancement Module Dual Path (LTE/Ethernet) Spec Sheet.
| Code | Meaning | Suggested Fix |
|---|---|---|
| FTC / Failure to Communicate | Report did not reach central station | Account, path, format, receiver online |
| Alt. Comms AC / Battery | Communicator power fault | Module power wiring, panel AUX budget, battery size |
| Alt. Comms FTC | Alternate path failed | Test primary and backup paths separately |
| Cellular registration / SIM | Module cannot register on mobile network | SIM active, APN, RSSI, antenna placement, carrier sunset |
| T-Link Network Fault | IP path cannot reach network | LAN cable, router, firewall, receiver IP |
| Leg | DLS status field | |
| SEM IP | T-Link/network fault | |
| SEM LTE | Registration / RSSI |