---
title: "PDM II - Bypass functionality defined"
slug: "pdm-ii-bypass-functionality-defined"
updated: 2025-06-05T15:16:32Z
published: 2025-06-05T15:16:32Z
canonical: "docs.telosalliance.com/pdm-ii-bypass-functionality-defined"
---

> ## 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.

# PDM II - Bypass functionality defined

All PDMs (PDM and PDM II) have a bypass relay that is activated by;

[Click here for version 2.0.0 release notes](/v1/docs/pdm-ii-release-notes#version-200)

- pressing the BYPASS button on the front of the unit
- loss of power to the unit.
- a soft reboot of the unit.

However, the bypass is a hard relay and can only bypass PHYSICAL inputs (Analog or AES) to the same physical output type. The following table shows where BYPASS can be used during an update.

| INPUT Source | OUTPUT Source | Works in BYPASS |
| --- | --- | --- |
| Analog | Analog | YES |
| AES 3 | AES 3 | YES |
| Analog | AES 3 | NO |
| AES 3 | Analog | NO |
| Analog or AES 3 | Any AoIP (AES 67 or Livewire) | NO |
| Any AoIP (AES 67 or Livewire) | Analog or AES 3 | NO |