---
title: "Quick Reference Guide - Rear Panel Switches"
slug: "quick-reference-guide-rear-panel-switches"
updated: 2024-10-22T13:12:02Z
published: 2024-10-22T13:12:02Z
canonical: "docs.telosalliance.com/quick-reference-guide-rear-panel-switches"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.telosalliance.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Quick Reference Guide - Rear Panel Switches

| SETTINGS |  | Function |
| --- | --- | --- |
| **Bit 1** | **Bit 2** | **EQ LO, Fixed dB Gain Adjustment** |
| OFF | OFF | 0 dB adjustment (factory default setting) |
| OFF | ON | +2 dB adjustment |
| ON | OFF | +4 dB adjustment |
| ON | ON | +6 dB adjustment |
| **Bit 3** | **Bit 4** | **EQ HI, Fixed dB Gain Adjustment** |
| OFF | OFF | 0 dB adjustment (factory default setting) |
| OFF | ON | +2 dB adjustment |
| ON | OFF | +4 dB adjustment |
| ON | ON | +6 dB adjustment |
| **Bit 5** | **Bit 6** | **Ducker dB Gain Adjustment** |
| OFF | OFF | Full Duplex (no attenuation) |
| OFF | ON | -6 dB attenuation (factory default setting) |
| ON | OFF | -12 dB attenuation |
| ON | ON | Half Duplex |
| **Bit 7** | **Bit 8** | **AGC and Noise Gate Settings** |
| OFF | OFF | Phone AGC = OFF, Noise Gate = OFF |
| OFF | ON | Phone AGC = 1/2 Full, Noise Gate = OFF |
| ON | OFF | Phone AGC = Full, Noise Gate = OFF (factory default setting) |
| ON | ON | Phone AGC = Full, Noise Gate = Normal |

| OPTIONS |  | Function |
| --- | --- | --- |
| **Bit 1** | **Bit 2** | **DDEQ Configuration** |
| OFF | OFF | DDEQ = OFF |
| OFF | ON | Fixed EQ (Use SETTING Bits 1-4 to set levels) |
| ON | OFF | Adaptive EQ (factory default setting) |
| ON | ON | Adaptive + Fixed EQ (Use SETTING Bits 1-4 to set fixed levels) |
| **Bit 3** | **Bit 4** | **Auto-Answer Configuration** |
| OFF | OFF | Auto-Answer = OFF (factory default setting) |
| OFF | ON | Auto-Answer = ON, Auto-Answer after first ring |
| ON | OFF | Auto-Answer = ON, Auto-Answer after third ring |
| ON | ON | Auto-Answer = ON, Auto-Answer after eighth ring |
| **Bit 5** |  | **Send Additional Gain to Caller** |
| OFF |  | No additional gain applied (factory default setting) |
| ON |  | +3 dB additional gain applied |
| **Bit 6** |  | **Hx2 Internal Mix-Minus Enable** |
| OFF |  | Disabled, Independent Mode (factory default setting) |
| ON |  | Enabled, Coupled Mode |
| **Bit 7** |  | **Feedback Reduction Enable** |
| OFF |  | Acoustic Echo Canceller disabled (factory default setting) |
| ON |  | Acoustic Echo Canceller enabled |
| **Bit 8** |  | **Reserved** |
| OFF |  | Reserved for future use (default factory setting) |
| ON |  | Not recommended |