Overview
The LE2077 LTE/HSPA cellular communicator adds 4G/LTE reporting to IMPASSA SCW9055/9057 self-contained systems, replacing older 3G modules where carriers have sunset 3G service.
Reporting path
LTE / HSPA cellular (IMPASSA)
At a Glance
| Detail | Value |
|---|
| Product type | Alarm communicator / reporting module |
|---|
| Model family (LE2077) | See label and install manual |
|---|
| Reporting path | LTE / HSPA cellular (IMPASSA) |
|---|
| Primary manual | LE2077 Installation Manual NA; Impassa LE2077 Spec Sheet |
|---|
| Region / listing notes | North America LE2077 SKU — confirm LTE band with carrier before install |
|---|
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
- Product page: DSC LTE Cellular Alarm Communicator (ID 2669)
- LE2077 Installation Manual NA; Impassa LE2077 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 |
| Communicator Trouble (IMPASSA) | SIM lock, 3G/Ethernet/receiver/supervision | Scroll troubles on WT5500; verify SIM and APN |
LE2077 LTE/HSPA
- LE2077 replaces legacy IMPASSA 3G modules — verify SIM is LTE/HSPA compatible, not 3G-only.
- Communicator trouble with good RSSI often indicates wrong APN or account not provisioned for LE2077 format.
LE2077 IMPASSA LTE
| WT5500 | Typical cause |
|---|---|
| Communicator Trouble | Wrong APN, inactive SIM, or LE2077 account not provisioned |
| FTC after power restore | Wait for auto-register — up to 15 min |
LE2077 replaces legacy 3G IMPASSA modules — SIM must be LTE/HSPA, not 3G-only.
LED / module diagnostics
Refer to LE2077 Installation Manual NA; Impassa LE2077 Spec Sheet for communicator-specific LED patterns and DLS module status screens.
Source: Host panel install manual § communicator / alt-comms troubleshooting; LE2077 Installation Manual NA; Impassa LE2077 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 |
| Communicator Trouble (IMPASSA) | SIM lock, 3G/Ethernet/receiver/supervision | Scroll troubles on WT5500; verify SIM and APN |
| WT5500 | Typical cause | |
| Communicator Trouble | Wrong APN, inactive SIM, or LE2077 account not provisioned | |
| FTC after power restore | Wait for auto-register — up to 15 min |