Viking Electronics CPC-4 Four-Channel CPC Disconnect Generator
The Viking Electronics CPC-4 is a four-channel CPC (Calling Party Control) disconnect generator designed for PABX analog station ports and similar analog telephone interfaces. If your phone system or auto-dialer doesn't reliably supervise call termination — leaving lines hung after the far end drops — the CPC-4 solves that at the hardware level, generating a clean 1-second disconnect signal so downstream equipment knows the call is truly over. This is a targeted fix for a specific telecom integration problem, and the CPC-4 handles it across four lines simultaneously with independent channel operation.
Overview
Analog telephone interfaces in security, access control, and building automation systems frequently encounter supervision failures: a PABX extension holds a line open after the remote party hangs up, causing downstream devices — emergency dialers, elevator phones, intercom controllers — to miss the disconnect event. The CPC-4 monitors each line continuously and injects a 1-second CPC disconnect signal the moment it detects a termination condition, bridging the gap between analog station behavior and equipment that depends on reliable call-end signaling. With four independent channels in a single compact unit, it handles multi-line installations without requiring one device per port. Explore the full Viking Electronics communications line for complementary analog interface hardware.
Key Features
- Four Independent CPC Channels: Each of the four channels operates independently, so a hang condition on one line doesn't affect the others. For installations with multiple elevator phones, gate intercoms, or emergency call stations on the same PABX, this means one unit covers the entire bank without cross-channel interference.
- 1-Second Nominal Disconnect Pulse: The CPC-4 generates a 1-second disconnect signal — long enough for virtually all downstream equipment to register the event reliably, short enough not to cause false re-dial conditions. This timing is fixed and consistent across all four channels.
- Detects Four Termination Conditions: The unit responds to busy signal, reorder (fast busy), return to dial tone, and steady silence. Two of these — return to dial tone and steady silence — are programmable, giving you control over how aggressively the unit interprets line state. This matters in environments where brief silences are normal (hold music gaps, slow IVR responses) and shouldn't trigger a disconnect.
- Phone Line Powered: The CPC-4 draws power from the telephone line itself — no separate power supply required in standard deployments. Minimum requirement is 20VDC at 20mA, which standard PABX analog ports provide. This simplifies installation considerably in distributed locations where running a separate power circuit would add cost and conduit.
- Compact Form Factor: At 5.25
