Axis Communications P8221 Network I/O Audio Module

BH #AXP8221 • MFR #0321-004
Axis Communications P8221 Network I/O Audio Module
Key Features
  • 8 Configurable Digital I/O Ports
  • Legacy Equipment Compatible
  • Speaker Output
  • Balanced Microphone Support
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The Axis Communications P8221 Network I/O Audio Module is a compact solution to provide or supplement network surveillance systems with input and output ports along with audio coverage.
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Axis Communications P8221 Overview

  • 1Description
  • 2Inputs
  • 3Audio
  • 4Microphone
  • 5Alarm
  • 6Software
  • 7Network Security
  • 8Power Supply

The Axis Communications P8221 Network I/O Audio Module is a compact solution to provide or supplement network surveillance systems with input and output ports along with audio coverage.

I/O capabilities are provided by 8 digital ports on the unit, which can be customized to act as input or output ports. This lets a wide range of sensors to be connected to the unit while simultaneously allowing the unit to communicate with relays and other devices. Older devices and sensors operating with a RS-232, RS-422, or RS-485 port can also be connected to the unit, thus reducing the need for expensive hardware upgrades.

In addition to the I/O ports, the P8221 offers 2-way audio capabilities to the surveillance system. High-quality audio can be encoded in AAC format with 32 kHz sampling at bitrates of up to 128 kbit/s. The unit can provide phantom power to balanced microphones, thus eliminating the need for clumsy auxiliary power cables. High-quality audio recording is facilitated by the built-in preamp and adjustable gain control in the unit. A speaker output is also provided, which provides 0.5W RMS of power.

The P8221 features an open Application Programming Interface (API), which allows easy integration into most existing network surveillance systems. The unit's I/O ports can be managed with Internet Explorer and audio streams can be recorded or played remotely. Custom alarms can also be set up, which will respond to audio detection, bootup, or external input by sending email, playing an audio clip or by using an external output port.

A host of security features protect the unit from unauthorized access at local and remote levels. Password protection and a user access log allow you to monitor local access to the unit while HTTPS encryption, IP filtering, and digest authentication prevent unauthorized remote network access.

The audio module usually requires 8-34 VDC or 20-24 VAC to function, and the Power over Ethernet (PoE) feature allows the unit to be powered via a standard network cable.


  • 8 digital ports configurable as input or output ports
  • RS-232, RS-485, and RS-422 serial ports for legacy device support
  • RJ-45 input for communication and PoE


  • 2-way, full and half duplex audio
  • High-quality AAC audio encoding at 128 kbit/s with 32 kHz sampling
  • Speaker output port supplying 0.5W RMS


  • Phantom power for 48V balanced microphones
  • Built-in preamp and adjustable gain control for fine tuning


  • Multiple trigger options including audio detection, external input, and bootup
  • Multiple trigger events including notification via email, external output and audio clip playback


  • Open API including VAPIX for easy integration into existing network surveillance software
  • Management and control of I/O ports through Internet Explorer

Network Security

  • Password protection and user access logs to monitor local access to the unit
  • IP filtering, HTTPS encryption, and digest authentication to prevent unauthorized network intrusions

Power Supply

  • 8-34 VDC or 20-24 VAC power supply
  • Power over Ethernet (PoE)

Axis Communications P8221 Specs

Digital I/OI/O Interface
Ports: 8 configurable I/O ports
Input ports: min -40 V DC, max 40 V DC
Output ports: open-drain, max load 100 mA, max voltage 40 V DC

I/O Functionality
Input trigger, output toggle/pulse
AudioAudio Streaming
Two-way, full and half duplex

Audio Encoding
AAC-LC 8, 16 or 32 kHz 8-128 kbit/s
G.711 PCM 8 kHz 64 kbit/s
G.726 ADPCM 8 kHz 32 or 24 kbit/s

Audio Decoding
G.711 PCM 8 kHz 64 kbit/s
G.711 PCM 16 kHz 128 kbit/s
G.726 ADPCM 8 kHz 32 or 24 kbit/s

Audio Input
Microphone/Line in
48 V phantom powered balanced microphone

Audio Output
Line out
Speaker: 0.5 W RMS at 4 Ω

Audio Functionality
Audio streaming, play uploaded (WAV, AU) and record (AU) clips
AU (G.711 μ-law 8-bit 8/16 kHz Mono), WAV (PCM 16-bit 8/16/32 kHz Mono)
Audio detection trigger
Password protection, IP address filtering, HTTPS encryption, IEEE 802.1X network access control, digest authentication, user access log

Supported Protocols
IPv4/v6, HTTP, HTTPS, QoS layer 3 DiffServ, FTP, SMTP, Bonjour, UPnP, SNMPv1/v2c/v3(MIB-II), DNS, DynDNS, NTP, RTSP, RTP, TCP, UDP, IGMP, RTCP, ICMP, DHCP, ARP, SOCKS
System IntegrationApplication Programming Interface
Open API for software integration, including VAPIX from Axis

Web Browser
Configuration and management
I/O monitor/control
Two-way audio, synchronize audio with external video source
Record (video and/or audio) to file (ASF)

System Requirements
Windows XP, Vista, 2000, Server 2003
DirectX 9c or higher, Internet Explorer required for audio support

Alarm Triggers
Audio detection, external inputs, on boot

Alarm Events
Notification via email, HTTP and TCP
External output port
Play audio clip
Metal casing. Standalone or wall mount

Processor and Memory
ARTPEC-3, 64 MB RAM, 128 MB Flash

8-34 V DC, max. 8.2 W or
20-24 V AC, max 13.7 VA or
Power over Ethernet IEEE 802.3af Class 3

Ethernet: RJ-45 10BASE-T/100BASE-TX PoE

Terminal Blocks
Power (8-34 V DC/ 20-24 V AC)
Balanced microphone
Speaker out
RS-232/RS-485/ RS-422 serial port
3.5mm mic/line in
3.5mm line out
Operating Temperature32 ~ 122°F (0 ~ 50°C)
Operating TemperatureHumidity 20-80% RH (non-condensing)
Dimensions (HxWxD)1.3 x 3.9 x 4.6" (32 x 99 x 118mm)
Weight0.7 lbs (335g)
Packaging Info
Package Weight1.8 lb
Box Dimensions (LxWxH)9.95 x 7.45 x 4.05"
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