---
title: "Quick Reference Guide - Internal Switches & Remote Connector"
slug: "quick-reference-guide-internal-switches-remote-connector"
updated: 2024-10-22T13:12:20Z
published: 2024-10-22T13:12:20Z
canonical: "docs.telosalliance.com/quick-reference-guide-internal-switches-remote-connector"
---

> ## 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 - Internal Switches & Remote Connector

#### Internal DIP Switch Bank - Line Voltages

| Bit 1 | Bit 2 | Bit 3 | Bit 4 | Telephone Network |
| --- | --- | --- | --- | --- |
| OFF | OFF | OFF | OFF | USA, Canada |
| OFF | OFF | OFF | ON | Japan, low voltage networks |
| OFF | OFF | ON | OFF | FCC-compliant countries |
| OFF | OFF | ON | ON | CRT21, Europe (real line impedance) |
| OFF | ON | OFF | OFF | Custom country configuration |
| OFF | ON | OFF | ON | Custom country configuration |
| OFF | ON | ON | OFF | Custom country configuration |
| OFF | ON | ON | ON | Europe (complex line impedance) |
| ON | OFF | OFF | OFF | Custom country configuration |
| ON | OFF | OFF | ON | Custom country configuration |
| ON | OFF | ON | OFF | Custom country configuration |
| ON | OFF | ON | ON | Reserved for future use |
| ON | ON | OFF | OFF | Reserved |
| ON | ON | OFF | ON | Reserved |
| ON | ON | ON | OFF | Reserved |
| ON | ON | ON | ON | Reserved |

#### Internal DIP Switch Bank - Call Progress Tone Disconnect

| Bit 5 | Bit 6 | Bit 7 | Bit 8 | CPTD Signal Characteristics |
| --- | --- | --- | --- | --- |
| OFF | OFF | OFF | OFF | U.S. dial tone ("precise" dial tone) |
| OFF | OFF | OFF | ON | U.S. re-order signal ("fast busy" tone) |
| OFF | OFF | ON | OFF | WORLD, single frequency dial tone |
| OFF | OFF | ON | ON | WORLD, re-order, ON = 155 - 550, OFF = 155 - 550 ms |
| OFF | ON | OFF | OFF | WORLD, re-order, ON = 250 - 1200, OFF = 250 - 1200 ms |
| OFF | ON | OFF | ON | WORLD, multi-tone dial tone |
| OFF | ON | ON | OFF | WORLD, multi-tone dial tone |
| OFF | ON | ON | ON | WORLD, pulse dial tone, ON = 150 - 350, OFF = 450 - 1100 ms |
| ON | OFF | OFF | OFF | WORLD, pulse dial tone, ON = 100 - 250, OFF = 200 - 400 ms |
| ON | OFF | OFF | ON | Reserved for future use |
| ON | OFF | ON | OFF | Reserved |
| ON | OFF | ON | ON | Reserved |
| ON | ON | OFF | OFF | Reserved |
| ON | ON | OFF | ON | Reserved |
| ON | ON | ON | OFF | Reserved |
| ON | ON | ON | ON | Call Progress Tone Detection (CPTD) feature disabled |

#### REMOTE Connector Pin Usage

| Pin | Direction | Unit | Function |
| --- | --- | --- | --- |
| 1 | GPIO Ground |  |  |
| 2 | GPI | Hybrid 1 | Hybrid ON |
| 3 | GPI | Hybrid 1 | Hybrid OFF |
| 4 | GPI | Hybrid 2 | Hybrid ON |
| 5 | GPI | Hybrid 2 | Hybrid OFF |
| 6 | GPO | Hybrid 1 | Line Ringing Indicator |
| 7 | GPO | Hybrid 1 | Hybrid In-use Indicator |
| 8 | GPO | Hybrid 2 | Line Ringing Indicator |
| 9 | GPO | Hybrid 2 | Hybrid In-use Indicator |