Its ability to handle hundreds of unique codes and cards makes it a standard choice for apartment complexes and office buildings.

It is worth noting that is also used as an identifier in U.S. Department of Defense research reports. Specifically, it has been associated with studies regarding the "Efficacy of Adjunct Sleep Interventions for PTSD (EASI-PTSD)" . If your "mp4" file is a recording of a lecture or presentation on this military medical study, the essay would focus on psychological recovery and sleep health for veterans rather than security hardware. LRR-4 - Viking Electronics, Inc.

The system is often used alongside video entry phones (such as the K-1705-3 , detailed in related documents like DOD# 158) to provide visual verification of visitors before granting access. III. Modern Significance in Security

The identifier most commonly refers to a specific technical practice document from Viking Electronics , designated as DOD# 164 . This document is a manual for the C-4000 Apartment/Office Entry Controller , a security system used to manage access for up to 250 tenants. While an ".mp4" file specifically by this name does not appear in public academic or cultural databases as a "proper essay" topic, the technical subject itself—security infrastructure and telecommunications—offers a structured basis for a technical analysis. Technical Analysis of the Viking C-4000 (DOD# 164) I. Purpose and Overview

Many configurations support activity logging, ensuring a digital trail of who accessed the building and when. Contextual Alternative: Research and Medicine

The C-4000 (referenced in ) serves as a multi-tenant entry controller designed to interface with standard dedicated phone lines or CO lines. Its primary function is to allow visitors to contact tenants via an entry phone, providing a secure method for remote door or gate release. II. Core Functionalities Capacity: Supports up to 250 tenants or phone numbers.

In the context of modern infrastructure, the C-4000 represents the shift toward centralized, programmable building security. It allows for:

Features two Wiegand inputs for proximity card readers or keypads, and two programmable relays for controlling multiple gates or doors.