March Networks 8516 Series User manual

March Networks
8516 Hybrid NVR with RAID
Models 8516 SR and 8516 RR
Installation Guide

Copyright © 2019. March Networks Corporation. All rights reserved.
Information in this document is subject to change without notice. MARCH NETWORKS,
March Networks Command, March Networks Searchlight, March Networks RideSafe, and
the MARCH NETWORKS logo are trademarks of March Networks Corporation. All other
trademarks are the property of their respective owners.
The terms HDMI and HDMI High-Definition Multimedia Interface, and the HDMI Logo are
trademarks or registered trademarks of HDMI Licensing LLC in the United States and
other countries.
North America.....................................1 800 563 5564
Latin America.......................................+52 55 5259 9511
Europe..................................................+39 0362 17935
Asia.......................................................+65 6818 0963
Australia and New Zealand.................+61 1300 089 419
Middle East and Africa........................+971 04 399 5525
www.marchnetworks.com
Notice of Rights
The software described in this document is furnished under a license agreement or
nondisclosure agreement. The software may be used or copied only in accordance with
the terms of those agreements. The contents of this manual and accompanying software
are protected by copyright. No part of this publication may be reproduced, stored in a
retrieval system, or transmitted, in any form or by any means, electronic, mechanical,
recording, or otherwise without the prior written permission of March Networks
Corporation.
Part Number
35946 Rev 2.1, December 2019

8516 Hybrid RAID NVR Installation Guide 3
Contents
Chapter 1: Mandatory Regulations .............................................5
Regulatory Compliance Statements..................................................................................... 5
Canada - Industry Canada.............................................................................................. 5
United States - Federal Communications Commission................................................. 5
Europe ............................................................................................................................. 5
Environmental Directive Compliance................................................................................... 6
Battery Notices ...................................................................................................................... 6
NiCd Battery Pack Notice............................................................................................... 6
Lithium Battery Notice ................................................................................................... 6
Avis pour les batteries........................................................................................................... 6
Avis sur le bloc de batterie NiCd.................................................................................... 6
Avis sur la batterie Lithium............................................................................................. 7
Safety Notice.......................................................................................................................... 7
Avis de sécurité...................................................................................................................... 7
Fuse......................................................................................................................................... 8
Fusible .................................................................................................................................... 8
Anti-Static Precautions .........................................................................................................8
Servicing Notice..................................................................................................................... 8
Shipping Notice ..................................................................................................................... 8
Model Definition Information................................................................................................ 8
Chapter 2: Feature Overview.......................................................9
Key Features......................................................................................................................... 10
Packaging/Shipment Contents........................................................................................... 11
Specifications....................................................................................................................... 12
Dimensions of the RR Model (with Docking Station) .................................................... 12
Dimensions of SR Model (with Backplane) .................................................................... 12
Weight ............................................................................................................................... 13
Operating and Storage Temperature............................................................................... 13
Power Ratings ...................................................................................................................13

8516 Hybrid RAID NVR Installation Guide 4
Contents
Video Inputs ..........................................................................................................................14
Video Capture Rates.............................................................................................................15
IP Camera Video Inputs.....................................................................................................15
Front Panel LEDs ..................................................................................................................16
Keyed Power Switch and Front USB Ports..........................................................................17
Keyed Power Switch..........................................................................................................17
Two Front USB Ports.........................................................................................................17
12-Volt Out, RS-485, and RS-232.........................................................................................18
12-Volt Out ........................................................................................................................18
RS-485 Interface ................................................................................................................18
RS-232 Interface ................................................................................................................18
Alarm and Switch Terminals ................................................................................................19
Connecting an Alarm or Switch Device............................................................................19
Audio Terminals ....................................................................................................................20
Audio Input ........................................................................................................................20
Audio Output.....................................................................................................................20
Ethernet Ports, USB Ports, Video and HD Monitor Output ...............................................21
Two Ethernet Ports and LEDs...........................................................................................21
Two Rear USB Ports ..........................................................................................................21
Video Output .....................................................................................................................21
HD Monitor Output............................................................................................................22
Power Connector and Fuse Compartment .........................................................................23
Power Connector ..............................................................................................................23
Fuse Compartment............................................................................................................23
Replacing the Fuse............................................................................................................23
Hard Drives............................................................................................................................24
Hard Drive Details..............................................................................................................24
Hard Drive Array - Important Considerations ..................................................................24
NiCd Battery Pack and Lithium Battery..............................................................................26
NiCd Battery Pack .............................................................................................................26
Lithium Battery..................................................................................................................26
Chapter 3: Unit Setup.................................................................27
Mounting the Recorder ........................................................................................................27
Rack-Mounting ......................................................................................................................28
Wall-Mounting.......................................................................................................................28
Items Required to Wall-Mount ......................................................................................28
Wall-Mounting with a Docking Station.............................................................................29
Attaching the Drip Trays to the Docking Station.........................................................30
Wall-Mounting without a Docking Station .......................................................................32
Attaching the Drip Trays to the Recorder ....................................................................33
Desk-Mounting......................................................................................................................34
Replacing Hard Drives..........................................................................................................35
Replacing a Hard Drive......................................................................................................35
Installation Requirements..............................................................................................35
Turning the Unit On and Off ................................................................................................41

8516 Hybrid RAID NVR Installation Guide 5
Chapter 1
Mandatory Regulations
You must be familiar with the following mandatory regulations governing the product’s operations.
You should also adhere to these instructions to ensure the installation meets regulatory
compliance.
Regulatory Compliance Statements
Canada - Industry Canada
This Class A digital apparatus complies with Canadian ICES-003.
CAN ICES-3 (A)/NMB-3(A)
United States - Federal Communications Commission
1 This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable
protection against harmful interference in a commercial environment. This equipment
generates, uses, and can radiate radio frequency energy, and if not installed and used in
accordance with the installation guide, is liable to cause harmful interference to radio
communications. Operation of this equipment in a residential area is likely to cause harmful
interference, in which case users will be required to correct the interference at their own
expense. Modifications not expressly approved by the manufacturer could void the user's
authority to operated the equipment under FCC rules.
2 This device complies with part 15 of the FCC rules. Operation is subject to the following two
conditions: (1) This device may not cause harmful interference, and (2) this device must accept
any interference received, including interference that may cause undesired operation.
Europe
This equipment complies with the following EU directives: 2014/30/EU, 2014/35/EU, and 2011/
65/EU. A Declaration of Conformity is available upon request.

8516 Hybrid RAID NVR Installation Guide 6
Mandatory Regulations
Environmental Directive Compliance
March Networks is committed to doing our part to protect the environment. March Networks is
compliant with current RoHS and WEEE directives:
• RoHS 2 or RoHS recast (directive 2011/65/EU) and its amendments
• WEEE recast (directive 2012/19/EU) and its amendments
Further details on corporate environmental policies and on RoHS and WEEE compliance are
available from March Networks customer support.
Battery Notices
CAUTION: There is risk of explosion if any battery is replaced with another battery of the incorrect
type. Ensure that you only use the NiCd battery pack and lithium battery provided by March Networks.
NiCd Battery Pack Notice
The unit contains an internal NiCd battery pack that is used during power shortages. The NiCd
battery pack may explode, leak, or get hot, causing personal injury if the following precautions are
not followed:
• Do not remove the NiCd battery pack and use it in a device other than the recorder.
• The unit has a built-in battery charger. Do not attempt to charge the NiCd battery pack using a
different battery charger.
• Replace only with a March Networks NiCd battery pack.
• Do not disassemble the NiCd battery pack.
• Do not open or try to open the individual NiCd battery pack cells.
• Do not dispose of the NiCd battery pack in fire.
• Do not short circuit the NiCd battery pack terminals.
Dispose of the NiCd battery pack in accordance with all applicable federal, state, provincial, and
local regulations. Inquire with your local recycling office for recycling guidelines.
Lithium Battery Notice
The unit contains an internal lithium battery that powers the clock and other system operations.
Ensure you consider the lithium battery when disposing of the unit. Dispose of the lithium battery in
accordance with all applicable federal, state, provincial, and local regulations. Inquire with your
recycling office for recycling guidelines.
Avis pour les batteries
ATTENTION: Il y a un risque d’explosion si une batterie est remplacée par un autre type de batterie.
Assurez-vous d’utiliser le bloc de batterie NiCd et la batterie Lithium de March Networks.
Avis sur le bloc de batterie NiCd
L’unité contient un bloc de batterie interne qui est utilisé lors de pannes de courant. Le bloc de
batterie NiCd peut exploser, couler ou devenir chaud, pouvant causer des blessures si les
précautions suivantes ne sont pas respectées :
• Ne pas enlever le bloc de batterie NiCd et/ou l’utiliser à d’autres fins.
• L’unité a un chargeur de batterie intégré. N’utiliser pas un autre chargeur pour charger le bloc de batterie.

8516 Hybrid RAID NVR Installation Guide 7
Mandatory Regulations
• Remplacer seulement avec les blocs de batterie de marque March Networks.
• Ne pas modifier le bloc de batterie NiCd.
• Ne pas ouvrir ou tenter d’ouvrir la batterie individuelle NiCd
• Ne pas jeter le bloc de batterie dans le feu.
• Ne pas court-circuiter les terminaux du bloc de batterie NiCd.
Disposer du bloc de batterie NiCd en accord avec les lois locales, provinciales ou fédérales.
Renseignez-vous à votre bureau de recyclage local pour les règles de recyclage.
Avis sur la batterie Lithium
L’unité contient une batterie Lithium interne qui procure du pouvoir à l’horloge interne de l’unité et
au système d’opération.
Assurez-vous de considérer la batterie Lithium lorsque vous disposer de l’unité. Disposez de la
batterie Lithium en accord avec les lois locales, provinciales ou fédérales. Renseignez-vous à votre
bureau de recyclage local pour les règles de recyclage.
Safety Notice
Before you access any components located inside the unit, turn the key counter-clockwise, to the
OFF position. After the status LEDs turn off, remove the power cord from the unit to prevent injury.
Only qualified service personnel are to access the inside of the unit.
An AC power cord is provided with a grounded attachment plug for the external power supply. To
avoid electrical shock, always use the AC power cord and plug with a properly grounded outlet
(connected to earth).
To maintain safety compliance, ensure the AC power cord has the appropriate safety approvals for
the country in which the equipment is to be installed. For North America, the AC power cord must
be a UL listed SJT NEMA 5-15 equivalent or better.
When connected to an outdoor camera, the screen of the camera’s coaxial cable must to be
properly grounded (connected to earth). Cable distribution systems are subject to the National
Electrical Code (NEC) in the United States and the Canadian Electrical Code (CEC) in Canada.
If you carry or move the NVR unit using the handles on the front panel, always use both handles. Do
not attempt to carry or move the unit using only one of the handles.
Avis de sécurité
Avant d’accéder aux composantes internes de l’unité, vous devez enlever le câble de pouvoir et
attendre que toutes les lumières d’état (‘STATUS LED’) de l’unité soient éteintes.
Seulement le personnel de service qualifié a le droit d’accéder l’intérieur de l’unité.
Le câble de pouvoir AC est fournie avec un câble de mise à terre pour le bloc d’alimentation
électrique. Pour éviter tout choc, utilisez toujours le câble de pouvoir AC relié avec la prise de
courant adéquate (contenant une mise à terre).
Pour maintenir votre conformité de sécurité, assurez-vous que le câble de pouvoir AC a obtenu les
approbations de sécurité applicables pour le pays ou l’installation est faites. Pour l’Amérique du Nord,
le câble de pouvoir AC doit avoir une certification UL SJT NEMA 5-15, équivalente ou meilleur.

8516 Hybrid RAID NVR Installation Guide 8
Mandatory Regulations
Lorsque relié à une caméra installée à l’extérieur, l’enveloppe du câble coaxial de la camera doit
être mise à terre de façon adéquate. Les systèmes de distribution câblés sont sujet au code
électrique National (NEC) au États-Unis et au code électrique Canadien (CEC) au Canada.
Si vous transportez ou déplacez l'unité NVR à l'aide des poignées du panneau avant, utilisez
toujours les deux poignées. N'essayez pas de transporter ou de déplacer l'unité en utilisant
seulement une des poignées.
Fuse
CAUTION: For continued protection against risk of fire, replace only with same type and rating of fuse.
For more information, see “Power Connector and Fuse Compartment” on page 23.
Fusible
ATTENTION : Pour une protection soutenue contre les risques d’incendie, remplacer seulement
avec un fusible de même type et classe.
Pour plus d'informations, consultez « Power Connector and Fuse Compartment » à la page 23.
Anti-Static Precautions
Ensure proper use of an anti-static guard during installation to avoid damage to the unit from
electrostatic discharge.
Servicing Notice
The procedures contained in this publication outline how to install or service components located
inside the unit, requiring the removal of the cover. Installation and maintenance procedures
requiring internal unit access are to be performed by qualified service personnel only.
Shipping Notice
Shipment of the unit and components may expose the unit to temperature extremes. We
recommend you allow the unit to return to room temperature prior to operation.
Model Definition Information
The HNVR HS Series and the HNVR HR Series are regulatory models for the 8516 SR and the 8516
RR 16 Channel Hybrid NVRs. The model information is outlined in the following table.
Certification Regulatory Model Includes the following NVRs:
HNVR HS series 8516 SR
HNVR HR series 8516 RR

8516 Hybrid NVR with RAID Installation Guide 9
Chapter 2
Feature Overview
The 8516 Hybrid NVR with RAID (Redundant Array of Independent Disks) is a 16-channel recording
platform with integrated RAID 5, able to support both analog and high-resolution IP cameras. The
models included are the 8516 RR and the 8516 SR.
The 8516 NVR offers outstanding video compression and storage, and can be managed using either
the March Networks Command or the Visual Intelligence video management platforms.
Note: You can manage an 8516 NVR using either of the management platforms offered by
March Networks: Command or Visual Intelligence. You should familiarize yourself with the
differences between the platforms prior to deploying the recorders. For more information,
see the documentation available from the March Networks Partner Portal.
The 8516 NVR is available in two distinct types: the RR model (8516 RR), which comes with a
docking station for mounting in a rack, and the SR model (8516 SR), which is intended to be placed
on a flat surface.
This section of the installation guide contains the following information:
• “Key Features” on page 10
• “Packaging/Shipment Contents” on page 11
• “Specifications” on page 12
• “Video Inputs” on page 14
• “Video Capture Rates” on page 15
• “Front Panel LEDs” on page 16
• “Keyed Power Switch and Front USB Ports” on page 17
• “12-Volt Out, RS-485, and RS-232” on page 18
• “Alarm and Switch Terminals” on page 19
• “Audio Terminals” on page 20
• “Ethernet Ports, USB Ports, Video and HD Monitor Output” on page 21
• “Power Connector and Fuse Compartment” on page 23
• “Hard Drives” on page 24
• “NiCd Battery Pack and Lithium Battery” on page 26

8516 Hybrid NVR with RAID Installation Guide 10
Feature Overview
Key Features
The 8516 Hybrid NVR with RAID comes in two distinct types: the RR model (8516 RR) and the
SR model (8516 SR). The RR model comes with a docking station and can be mounted in a rack,
the SR model has a backplane and is intended to be placed on a flat surface such as a desktop.
Some of the key features and benefits of the 8516 Hybrid NVR with RAID include:
•Camera Capacity: 16 total cameras. The recorder accommodates any combination of analog or
IP cameras, as long as the total number of cameras is 16.
•Concurrent Frame Rate:15 FPS per channel at 4CIF, 30 FPS at 2CIF / CIF
•IP Camera Bandwidth: 16 channels at 3 mbps = 48 mbps total
•RAID: Integrated RAID controller - RAID 5 support using 4 hard drives. RAID 5 offers the best
overall balance of data protection and performance, and makes the most efficient use of drive
capacity.
•Hard Drives: Each unit must have four hard drives to support RAID. Various drive capacities are
available, but each of the four drives must be the same capacity to support RAID (for example,
4 x 8TB or 4 x 12TB).
•Video compression:
- Analog cameras — H.264 with multi-level encoding
- IP cameras — H.264, MPEG4, JPEG
• Eight alarm inputs, four switches, plus four mono audio inputs and two mono audio outputs, for
enhanced audio/video security coverage.
• High-capacity internal storage: four SATA RAID hard drives
• Internal back-up battery for power brown-out protection.
• Advanced networking features for unlimited scalability and dependable remote access.
• Advanced health management features for centralized support and maximum up-time.
• QR code - use March Networks’ free GURU Smartphone App to scan the recorder’s front panel
QR code for instant product information, like serial number and warranty information.
The RR model recorders slide out of the docking station for easy installation and maintenance.
8516 RR NVR
Docking Station
Top of recorder

8516 Hybrid NVR with RAID Installation Guide 11
Feature Overview
Packaging/Shipment Contents
The following items are included in each system shipment, and should be located/verified before
installation begins:
• 8516 Hybrid NVR with RAID
• Docking station (RR model)
• Keys for activating unit power (and locking the unit in the docking station for the RR model)
• AC power cord
• Hard drive mounting screws - Four (4) screws per drive. If hard drives are installed, screws are
in use.
• Data and power cables for the hard drives
• Software DVD — The software can also be downloaded from the March Networks Partner Portal
website.
• Technical publications — Included with the software, or you can also download hardware and
software technical publications (PDFs) from the March Networks Partner Portal website.
Note: A wall-mounting kit can be purchased separately if required.
WARNING: The procedures contained in this guide outline how to install or service components
located inside the unit, requiring the removal of the cover. Installation and
maintenance procedures requiring internal unit access are to be performed by
qualified service personnel only.
When working inside the unit, ensure you take anti-static precautions.
Any attempt to service components of the recorder that are not considered
field replaceable will invalidate your warranty. The list of field serviceable parts
includes:
• Hard drives, caddies, and cables
• Back-up batteries
• Fans
Do not power up or operate the unit with the cover removed. The cover
ensures the safe operation of the unit. Operating the unit without the cover can
expose you to live electric current and can cause the hard drives to overheat.
Docking the unit without the cover can also cause alignment problems and
damage the docking station connectors.

8516 Hybrid NVR with RAID Installation Guide 12
Feature Overview
Specifications
This section contains the dimensions, weight, temperature ranges, and power ratings of the unit.
Dimensions of the RR Model (with Docking Station)
Dimensions of SR Model (with Backplane)
17.4 inches/44.2 centimeters
19.2 inches/48.8 centimeters
16.0 inches/40.6 centimeters
3.1 inches/8.0 centimeters
0.8 inches/2.0 centimeters
14.6 inches/37.1 centimeters
16.9 inches/43.0 centimeters
16.0 inches/40.6 centimeters
3.2 inches/8.1 centimeters

8516 Hybrid NVR with RAID Installation Guide 13
Feature Overview
Weight
• RR models with docking station (no hard drives): 18.5 pounds / 8.4 kilograms
• SR models with backplane (no hard drives): 13.0 pounds/5.9 kilograms
• Each hard drive: Approximately 6 pounds / 2.8 kilograms
Operating and Storage Temperature
• Operating temperature: 41 to 104°Fahrenheit / 5 to 40°Celsius
• Storage temperature: -40 to 158°Fahrenheit / -40 to 70°Celsius
WARNING: The recorder and docking station (if required) must be mounted in accordance with
the mounting guidelines in this publication to ensure the unit remains within the
recommended operating temperature range. For more information, see “Mounting
the Recorder” on page 27.
Power Ratings
• Power input: 100-240 volts AC input (auto-sensing)
• Current rating: 2.3 A
• Frequency range: 50-60 Hz
• Power consumption: 50 W (typical)

8516 Hybrid NVR with RAID Installation Guide 14
Feature Overview
Video Inputs
There are 16 analog video inputs on the back of the unit. The IP cameras can connect to the
recorder through a camera network on the camera Ethernet port (see “Ethernet Ports, USB Ports,
Video and HD Monitor Output” on page 21). IP cameras are connected using a CAT5e cable or a
cable of higher performance, such as CAT6 cable.
The number of IP cameras the unit supports depends on the number of analog cameras you are
using.
The unit has 16 hybrid channels which can be used to include any combination of 0-16 analog
cameras and 0-16 IP cameras, as long as the total number of cameras is 16. The 8516 does not
support any
IP-only camera channels.
For example, if no analog cameras are in use, the 8516 model supports up to 16 IP video cameras. If
no IP cameras are in use, it supports up to 16 analog cameras. You can combine IP and analog
cameras (for example, 8 IP cameras and 8 analog cameras) as long as they add up to a total of 16
cameras.
Video Inputs on BNC Coaxial Connector
The analog video inputs are BNC coaxial connectors that support NTSC (North American) and PAL
inputs.
Video Termination
Video termination for the 8516 is controlled through the Visual Intelligence software. You can use
the March Networks Administrator Console application to view and modify the analog video
termination.
For more information, see the Administrator Console User Manual or online Help.
Video Inputs 1-16

8516 Hybrid NVR with RAID Installation Guide 15
Feature Overview
Video Capture Rates
This section details the video inputs and associated video capture rates.
The 8516 supports the following resolutions for analog cameras:
• 4CIF — 704 x 480 (NTSC) or 704 x 576 (PAL)
• 2CIF — 704 x 240 (NTSC) or 704 x 288 (PAL)
• CIF — 352 x 240 (NTSC) or 352 x 288 (PAL)
The FPS (frames per second) values are across all 16 video inputs.
8516 Models
•NTSC: 15 FPS per channel (all 16 channels) = 240 FPS at 4CIF
•PAL: 13 FPS per channel (all 16 channels) = 200 FPS at 4CIF
IP Camera Video Inputs
The IP camera input capture rate is dependent on the resolution and quality of the images
captured.
The IP cameras have a recommended maximum of 15 FPS per channel at 4CIF for the 8516 model.
The 8516 provides a capture rate of up to 3 mbps and 15 FPS per attached IP camera for 16
cameras (a total of 48 mbps of inbound traffic from 16 IP cameras).
• 16 channels at 3 mbps = 48 mbps

8516 Hybrid NVR with RAID Installation Guide 16
Feature Overview
Front Panel LEDs
The colored LEDs (Light Emitting Diodes) on the front panel of the unit indicate status. Each
tricolor LED is marked to indicate which component the LED displays information about. The color
of the LED and whether the light is on solid, flashing, or off, gives you information about the
recorder.
Unit LED
The status of
the unit.
Green Solid: The unit’s software and hardware are operating correctly.
Flashing: The keyed power switch has been turned off or power has been
removed — the system is waiting for software to complete the shutdown of the
unit.
Blue Solid: The operating system is loaded but the unit’s software application is still
loading.
Flashing: The unit is booting up after the keyed power switch has been turned
on or after a software reboot.
Red The hardware watchdog timer has expired and reset the system.
Operation LED
The status of
the unit’s
operation.
Green Solid: The software in the unit is operating correctly, and the unit is powered
and running.
Flashing: The operating system is available but the software is still loading.
Blue A system-level problem (non-critical) has been reported.
Red A critical error has occurred.
Use the Administrator Console or Command Client software application to
review the health alert and determine a possible resolution.
For more information, see the Administrator Console User Manual or
Command Enterprise User Guide, available from the March Networks Partner
Portal website.
Recording LED
The status of
the unit’s
recording.
Green Actively recording as configured (the recorder may be configured to record
continuously or only configured to record when triggered by an alarm or a
schedule).
Red A system-level problem has occurred which is affecting current recording or
will affect future recording.
Off The system is starting up or is not currently configured to record.
Front Panel LEDs

8516 Hybrid NVR with RAID Installation Guide 17
Feature Overview
Note: Information about operation and recording errors (indicated by the Operation or Recording LED) can
be retrieved using the Command Client or the Administrator Console (depending on which software platform
you are using, Command or Visual Intelligence).
For more information, see the Command Enterprise User Guide or the Administrator Console User Manual,
available from the March Networks Partner Portal.
Keyed Power Switch and Front USB Ports
There is a keyed power switch and two USB ports on the front of the unit.
Keyed Power Switch
If the unit has a docking station (RR model), when the unit is powered on, the locking mechanism
prevents the unit from being undocked. Turning the key to the left initiates shut down. Once the LEDs
are off, if the unit has a docking station, the unit can be safely removed from the docking station.
Two Front USB Ports
There are two USB ports on the front of the unit for connection of external peripherals.
Each port provides up to 0.5 A to power peripherals with a USB cable.
The ports support USB version 2.0.
Note: Two more USB ports are available at the rear of the unit. For details, see “Ethernet Ports,
USB Ports, Video and HD Monitor Output” on page 21.
Export LED
The status of an
export to an
external media
device.
Green Solid: Media transfer is complete.
Flashing: Media transfer is in progress.
Blue Solid: External media device detected.
Flashing:
• A request to export media clips to an external media device has been
initiated but the recorder is still logging the media. Exporting will not start
until the recorder finishes logging the media.
• Media clips are ready to be exported to the external media device but no
external device is detected.
• The external media device is full. Empty the device or insert a new one.
Red Failure of media transfer.
Off No external media device is connected or the external device is not usable.
Keyed Power Switch 2 USB Ports

8516 Hybrid NVR with RAID Installation Guide 18
Feature Overview
12-Volt Out, RS-485, and RS-232
There is a 12-Volt Out connection, an RS-485 interface, and an RS-232 interface on the back of the
unit.
Pinout
12-Volt Out
This connection is for powering external devices with a battery backed up source. It is intended for
use with the March Networks 2316 Encoder.
Maximum 12 Watts.
The Gindicates the ground connection pin and the +indicates the 12-volt positive connection pin.
RS-485 Interface
The RS-485 interface allows you to control a PTZ camera, with the following pins:
You can also use this to provide text capture with an RS-485 to RS-232 converter.
RS-232 Interface
The RS-232 interface allows you to provide text capture, with the following pins:
You can also use this to control a PTZ camera with an RS-232 to RS-485 converter.
Pin --- Rx+ Rx- --- Tx+ Tx- ---
Definition Unused
pin
Input:
Receive
positive
Input:
Receive
negative
Unused
pin
Output:
Transmit
positive
Output:
Transmit
negative
Unused
pin
Pin Rx G Tx
Definition Input Ground Output
RS-485 RS-23212-Volt Out

8516 Hybrid NVR with RAID Installation Guide 19
Feature Overview
Alarm and Switch Terminals
There are alarm and switch terminals on the back of the unit. Alarm and switch devices can connect
to these.
Connecting an Alarm or Switch Device
Using the following procedure, you can connect alarm and switch devices to the terminals at the
back of the unit.
Note: The 8516 NVR does not support End-of-Line (EOL) resistors. Only Open and Closed states
are monitored.
To connect an alarm or switch device
1 Ensure the unit is powered down and the LEDs at the front of the unit are off.
2 Locate the appropriate alarm or switch terminals (refer to the graphic above).
3 Attach the device to the appropriate terminals:
For alarm devices:
• Use the G (ground) terminal closest to the alarm terminal when connecting the
common wire.
Note: The alarm input is open/short, dry contact only.
For switch devices:
• Connect the switch device common wire to the appropriate common (C) terminal.
Note: The maximum voltage for a connected switch device is 60 volts DC input at 1 Amp
or 60 Watts. Anything above 60 Watts must be handled by a second-stage relay control
circuit, approved and validated by certified electrician.
• Depending on the switch’s default state, connect the normally-open or normally-closed
wire to the corresponding normally-open (NO) or normally-closed (NC) terminal,
respectively.
4 After you connect all of the alarm and/or switch devices, you can turn on the unit.
Switch Terminals
Alarm Terminals

8516 Hybrid NVR with RAID Installation Guide 20
Feature Overview
Audio Terminals
Audio in and out terminals are available on the back of the unit. These terminals provide line level
audio input and output.
Audio Input
Connect an audio cable to the Audio In terminal block.
Use the audio cable to connect an audio input device, such as a microphone, to the unit.
If you are connecting a microphone to the unit, you must use a pre-amplifier to amplify the signal to
line level. Place the pre-amplifier close to the microphone for best results.
Input specification: unbalanced, 10 kΩ, 1Vp-p (line level)
Audio Output
Connect an audio cable to the Audio Out terminal block. Use the audio cable to connect an
amplified audio output device, such as an intercom or speaker, to the unit. Ensure that the audio
output device (whether intercom or speaker) includes a built-in amplifier.
Output specification: unbalanced, 600 Ω, 1Vp-p (line level)
Pinout Description
Audio
In
1 Signal for audio input channel 1. Connect the return to the “G” between audio input 1 and 2.
2 Signal for audio input channel 2. Connect the return to the “G” between audio input 1 and 2.
3 Signal for audio input channel 3. Connect the return to the “G” between audio input 3 and 4.
4 Signal for audio input channel 4. Connect the return to the “G” between audio input 3 and 4.
G Return for the audio inputs. Each “G” is shared with 2 adjacent input channels. The 2 adjacent
input channels are the only channels that should use each return.
Audio
Out
1 Signal for audio output channel 1. Connect the return to the “G” between audio output 1 and 2.
2 Signal for audio output channel 2. Connect the return to the “G” between audio output 1 and 2.
G Return for the audio outputs. The 2 adjacent output channels are the only channels that should
use this return.
Audio In Audio Out