Lectrosonics SPNCWB/E01 Mounting instructions

Rio Rancho, NM, USA
www.lectrosonics.com
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SPNCWB/E01
Conference Interface - Wideband Bridging
INSTALLATION and STARTUP GUIDE
Software and Hardware Installation and Setup

SPN Conference
LECTROSONICS, INC.
2
This symbol, wherever it appears, alerts
you to the presence of uninsulated danger-
ous voltage inside the enclosure -- voltage
that may be sufficient to constitute a risk of
shock.
This symbol, wherever it appears, alerts
you to important operating and mainte-
nance instructions in the accompanying
literature. Please read the manual.
When using your telephone equipment, basic safety
precautions should always be followed to reduce the
risk of fire, electric shock and injury to persons, includ-
ing the following:
1) Read these instructions.
2) Keep these instructions.
3) Heed all warnings.
4) Follow all instructions.
5) Do not use this apparatus near water.
6) Clean only with a dry cloth.
7) Do not block any ventilation openings. Install in ac-
cordance with the manufacturer’s instructions.
8) Do not install near any heat sources such as radia-
tors, heat registers, stoves, or other apparatus
(including amplifiers) that produce heat.
9) Do not defeat the safety purpose of the polarized
or grounding-type plug. A polarized plug has two
blades with one wider than the other. A ground-
ing type plug has two blades and third ground-
ing prong. The wider blade or the third prong are
provided for your safety. If the provided plug does
not fit into your outlet, consult an electrician for
replacement of the obsolete outlet.
10) Protect the power cord from being walked on or
pinched particularly at plugs, convenience re-
ceptacles, and the point where they exit from the
apparatus.
11) Only use attachments/accessories specified by
the manufacturer.
12) Use only with the cart, stand,
tripod, bracket, or table specified by
the manufacturer, or sold with the
apparatus. When a cart is used,
use caution when moving the cart/
apparatus combination to avoid
injury from tip-over.
13) Unplug this apparatus during lightning storms or
when unused for long periods of time.
Important Safety Instructions
14) Refer all servicing to qualified service person-
nel. Servicing is required when the apparatus has
been damaged in any way, such as power-supply
cord or plug is damaged, liquid has been spilled or
objects have fallen into the apparatus, the appara-
tus has been exposed to rain or moisture, does not
operate normally, or has been dropped.
15) WARNING -- TO REDUCE THE RISK OF FIRE
OR ELECTRIC SHOCK, DO NOT EXPOSE THIS
APPARATUS TO RAIN OR MOISTURE.
16) The AC mains plug, or appliance coupler shall
be readily available to the operator as a means of
power disconnection, if applicable.
17) Unit shall be connected to a MAINS socket outlet
with a protective earthing connection.
18) Do not use this product near water for example,
near a bathtub, washbowl, kitchen sink or laundry
tub, in a wet basement or near a swimming pool.
19) Avoid using a telephone (other than a cordless
type) during an electrical storm. There may be a
remote risk of electric shock from lightning.
20) Do not use the telephone to report a gas leak in
the vicinity of the leak.
21) Use only the power cord and batteries indicated
in this manual. Do not dispose of batteries in a fire.
They may explode. Check with local codes for pos-
sible special disposal instructions.
22) “CAUTION: To reduce the risk of fire, use only
No. 26 AWG or larger (e.g., 24 AWG) UL Listed or
CSA Certified Telecommunication Line Cord”
SAVE THESE INSTRUCTIONS

Installation and Startup Guide
Rio Rancho, NM 3
Introduction
The SPN Conference interface combines the audio
from a telephone line, two codecs and microphones
in the local sound system to provide natural sounding
telepresence and audio conference meetings. A power-
ful AEC (acoustic echo canceller) is provided, which
converges fast enough to follow multi-site bridging and
gain proportional automatic mixing without losing con-
vergence depth. The AEC can handle an unlimited num-
ber of microphones and will re-converge quickly enough
to follow the movement of a wireless microphone.
Three sites can be bridged into a single conference
with one SPN Conference processor. Three additional
sites can be added with another processor with signals
combined into the ASPEN matrix for extensive routing
and processing options.
The outstanding performance of the AEC is further en-
hanced with patented, seamless automatic mixing. The
automatic mixing is applied at the crosspoints in the
matrix, which allows each signal source to exhibit a dif-
ferent behavior at the system outputs. This is useful, for
example, when the signal must participate in the confer-
ence using one of several automatic mixing modes on
some outputs, and be recorded with no processing on
other outputs.
Every input includes a dynamic noise reduction filter to
enhance dynamic signals and suppress steady state
noise. This unique algorithm is a single ended, frequen-
cy selective process that significantly reduces noise
from one or multiple sources. It is especially useful with
noisy teleconference connections.
For convenience, a TCP/IP addressable Ethernet port
and built in power amplifier are included.
This manual covers hardware installation and wir-
ing and the installation of ASPEN software. Once the
processor is communicating with a computer, refer to
the Help files in the software control panel for additional
setup and configuration settings.
Inspection of the Unit
Compare the packing list enclosed with the unit with
the original order. Inspect all items for damage. Im-
mediately call 1-800-821-1121 to report any items that
are missing or damaged. The sooner you notify us,
the sooner you will get any needed replacement items
shipped to your location.
*Crestron®is a registered trademark
of Crestron Electronics, Inc.
Table of Contents
Important Safety Instructions......................................................2
Controls and Features ................................................................4
Front Panel .................................................................................4
Rear Panel..................................................................................5
Hardware Installation..................................................................6
Installing the chassis into a rack.................................................6
Cables .......................................................................................6
Audio Connectors ......................................................................6
Audio Inputs – Unbalanced ........................................................6
Audio Inputs – Balanced.............................................................6
Audio Outputs.............................................................................7
Telephone Line Jack ...................................................................7
Programmable Inputs .................................................................7
CODEC and TEL Remote Control Ports.....................................7
Power Amp Outputs....................................................................8
Programmable Outputs...............................................................8
ASPEN RS-232 Port...................................................................9
Connecting the Master for the First Time ...................................9
Cabling Of Stacked Units............................................................9
Software and Firmware Updates..............................................10
Creating an ASPEN Installer Disk ............................................10
Firmware Update Procedure ....................................................11
MCU Recovery from Interrupted Firmware Update Procedure 11
Software Installation .................................................................12
USB Driver Installation .............................................................13
Minimum Setup.........................................................................14
Stacking Multiple Units .............................................................16
Refer to the Help Files..............................................................16
Multi-site Bridging Setup...........................................................17
AEC Reference Mix ..................................................................17
AEC Signal Mix.........................................................................18
Enable the AEC and Define the Inputs.....................................18
SEND Mixes .............................................................................19
LOCAL Mixes ...........................................................................20
The Finished Setup ..................................................................21
Service and Repair...................................................................22
Returning Units for Repair........................................................22

SPN Conference
LECTROSONICS, INC.
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Controls and Features
Headphone Monitor
Standard 1/4 inch jack and level control. Drives both
channels of stereo headphones.
MCU Recovery (recessed pushbutton)
Used in the procedure to recover from an interrupted
firmware update procedure. See section on Firmware
Update Procedure for details on usage.
Front Panel
USB Port
Standard USB connector for the setup and control from
a computer using Windows XP, Vista or Windows 7 op-
erating system. The USB port is also used for firmware
updates.
Status LEDs
• Comm LED - indicates USB, RS-232 and network
communication
• Alert LED - blinks to indicate fault or error
• Alert LED - glows steady in firmware update mode
• Power LED - glows to indicate power ON
POWER
Switch
USB Port Alert
LED
Headphone Monitor Comm
LED
Power
LED
MCU Recovery

Installation and Startup Guide
Rio Rancho, NM 5
Rear Panel
Programmable Input and Output Ports
Programmable inputs and outputs used to control
levels, settings, indicate the current state of a program-
mable input and control a variety of other parameters.
ASPEN Bus Data/Audio Ports
This gigabit bus transports audio and data from one
board to the next through CAT-6 cabling (maximum 2
meters or 6.5 ft length) and RJ-45 connectors. Proces-
sors are normally installed with the Master unit on top
and Slave units below it. The cabling is then connected
from the uppermost jack on one board to the lowermost
jack on the unit just above it.
Remote Control
These RJ-45 jacks provide interfaces for RCWTH4
remote control units. Each jack is assignable to CODEC
1 or 2, or to the telephone line.
Audio Inputs and Outputs
Analog audio input and output connectors for the Codec
ports.
Telephone Set/Line
RJ11 jacks for connecting a standard telephone line
and a single-line telephone set.
Power Inlet RS232
Serial Port
Programmable Input
and Output Ports
Data/Audio
Bus Ports
Line Inputs
(Codecs)
Telephone
Set/Line
Line Outputs
(Codecs)
Remote
Control
SPN CONFERENCE ASPEN PORT
ETHERNET
RS-232
CODEC
1
POWER AMP
OUTPUTS
LINE
OUTPUTS
CODEC
2
LINE
INPUTS
CODEC
1
CODEC
2
12
TELEPHONE
LINE
REMOTE
CONTROL
RC 2
RC 1
SET
100 - 240 VAC
50/60 HZ
15 WATTS
GND
+5V
PROG IN
PROG
OUT
Adaptive Proportional Gain Mixing
US Patent 5,414,776
Cooling Fan
Outlet
Speaker
Terminals
Ethernet
Port

SPN Conference
LECTROSONICS, INC.
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Audio Inputs – Unbalanced
Unbalanced audio sources include items such as con-
sumer VCR’s, DVD players, etc., which can be connect-
ed with either 2-wire or 3-wire cables. The (+) terminal
of the source is connected to the (+) terminal of the
processor. The shield and (–) connections are made as
shown here.
Three wire cables should have the shield connected to
the (–) connector at the source end of the cable.
Processor
Unbalanced source to
ASPEN input – 3-wire cable
Source
Shield
Two wire cables should have a jumper between the
processor (–) input and ground.
Processor
Unbalanced source to
ASPEN input – 2-wire cable
Source
Shield
Audio Inputs – Balanced
Balanced audio sources connect to the processor in-
puts in a straight “pin to pin” configuration.
Processor
Balanced source to
ASPEN input
Source
Shield
Installing the chassis into a rack
Install the chassis so that the cooling fan vent is not
blocked. Mount with 4 rack screws using the appropri-
ate mounting holes. Use nylon washers to prevent
damage to the front panel’s finish when tightening the
mounting screws.
All ASPEN processors have internal switching power
supplies that can tolerate voltages ranging from 100
to 240 VAC. Use an approved power cord with an IEC
60320 C13 connector.
Cables
It is recommended that you use lacing bars for cable
strain relief when mounting in a rack. Use only profes-
sional audio cable with proper shielding – typically, two
conductor plus ground/shield.
Audio Connectors
The analog audio inputs and outputs are connected
through 5-pin de-pluggable connectors. Strip the insula-
tion back 1/8 to 3/16” but do not tin (apply solder to)
the leads. Insert the wire into a de-pluggable connec-
tor, leaving less than 1 mm of bare wire exposed, then
tighten the retaining screw.
Caution: Do not overtighten the screws.
5-pin depluggable
connector
Do not leave more than
1 mm of exposed wire
beyond the connector.
Do not apply
solder to leads
Retaining Screw
(Do not overtighten)
Note the labeling on the rear panel for the positive and
negative leads. Ground is shared between two connec-
tions (the center pin).
Note: ASPEN processors do not have a “pin 1
problem.” Inputs and outputs are true differential
connections.
Hardware Installation

Installation and Startup Guide
Rio Rancho, NM 7
Programmable Inputs
Programmable inputs are provided to enable external
control over a variety of parameters. Each input can
respond to a contact closure, a DC voltage source, or
the variable voltage output from a potentiometer. The
following illustrates common connections to the pro-
grammable input pins.
10K Linear Potentiometer
CCW CW
+5V
To Programmable Input Pin
Gnd
Contact Closure as Programmable Input
To Programmable Input Pin
Gnd
DC Voltage Source as Programmable Input
To Programmable Input Pin
0VDC (Off) to +5VDC (On)
Gnd
Potentiometer Connection for
Analog Control of Gain
Programmable
Inputs
Programmable
Outputs
Ground
+5VDC
CODEC and TEL Remote Control Ports
These RJ-45 connectors are used with the RCWTH4
remote control module, connected with standard CAT-5
cabling. Each port is assignable to Codec 1, Codec 2 or
the telephone line.
Remote Control Ports
can be assigned to
Codec 1, Codec 2 or
the Tel LIne.
1 GND
2 Connect Button
3 Privacy Button
4 Volume Up Button
5 Volume Down Button
6 Privacy LED
7 Connect LED
8 GND
Audio Outputs
The line outputs are a balanced differential configura-
tion which can drive balanced or unbalanced inputs on
other audio equipment with the wiring shown here.
Balanced output to a balanced input is a straightforward
“pin to pin” configuration.
Destination
Output
Balanced output to
balanced destination
Shield
Balanced output to unbalanced input with a 3-wire
cable is connected with the cable shield added to the
(–) terminal on the destination input.
Destination
Output
Balanced output to unbalanced
destination – 3-wire cable
Shield
Balanced output to unbalanced input with a 2-wire cable
is connected with the output (–) connected to the cable
shield at the processor output.
Destination
Balanced output to unbalanced
destination – 2-wire cable
Output
Shield
Telephone Line Jack
Connect a standard telephone cable with RJ11 connec-
tors between the back panel Telephone Line Jack and
the host telephone system.

SPN Conference
LECTROSONICS, INC.
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Programmable Outputs
Programmable outputs are used for several purposes:
• indicate the current state of a programmable input
• monitor activity on telephone or codec interfaces
• monitor active preset changes
Each programmable output is the electrical equivalent
of a contact closure to ground. When a programmable
output is “active” it conducts current to ground. When
the programmable output is “inactive,” no current flows
to ground. The maximum usable voltage for the pro-
grammable outputs is 40 V and they will safely conduct
up to 100 mA DC continuous.
Both LEDs and 5V relay coils can be powered by the
+5 V DC pins on the programmable input connector, as
long as the maximum combined current for all LEDS
and relay coils does not exceed 100 mA.
LED
380 TO
500 OHM
10K
LINEAR
POT
CW
CCW
IN 1
IN 3
ON
OFF
LOGIC OUTPUTS
GROUND
5VDC
LOGIC INPUTS
LOGIC
OUT 7
LOGIC IN 3
ANODE CATHODE
V
R
Anode
Cathode
CathodeAnode
380 Ohms
Programmable Output Pin
380 Ohms
Programmable Output Pin
1N4001
or equiv.
External
DC Voltage
Source
(<40VDC)
Relay Coil
Coil current <100mA
Programmable Output Pin
Relay is on when the programmable output is active
+5VDC
+5VDC
GND
LED is ON when the programmable output is active
GND
LED is OFF when the programmable output is active
Note: The diagram above shows an external DC source pow-
ering the relay coil. This is necessary whenever coil voltages
exceed 5 volts.
Power Amp Outputs
The amplifier is designed to run continuously (idle or
with a load) without heat buildup, making it ideal for
permanent installations where prolonged operation is
required.
Each output can drive a variety of loads, including loud-
speakers, long cable runs and headphones. The BTL
(bridge tied load) configuration allows the two channels
to be wired in parallel on a common load to double the
output power.
+
-
+
-
BTL output wiring

Installation and Startup Guide
Rio Rancho, NM 9
Connecting the Master for the First Time
NOTE: Install ASPEN software before connecting
the Master unit to a computer.
The computer operating system will automatically de-
tect and configure a USB port for the Master unit when
it is connected and turned on the first time. Wait for the
screen message that advises that the new device has
been configured and is ready for use.
Cabling Of Stacked Units
In a stacked configuration, ASPEN processors must
be interconnected as shown here. The ASPEN bus is
bidirectional, allowing data and audio to be propagated
forward and backward through a single cable connec-
tion. Each Slave unit in a stack gathers data and audio
signals from the unit below it, adds its own signals and
passes the total on to the unit above it. At the top of the
stack, the Master unit gathers all signals from below,
adds its own and then sends the total back down the
bus to all Slave units below it. This architecture allows
all Slave units to have access to the mixing data and
audio in all 48 final mixes.
Each circuit board has an upper and a lower ASPEN
bus connector. Since there are two circuit boards in a
2RU unit such as the SPN1624, the circuit boards are
connected in the same manner as if they were each in
a separate chassis.
1RU SPN
Conference
configured as
Master
2RU SPN1624
configured as
intermediate
Slave
1RU SPN16i
configured
as lowermost
Slave
ASPEN PORT
The processors automatically configure themselves for
Master and Slave status as determined by the cabling.
If a unit is connected to another unit above it through
the upper connector, it is automatically configured as a
Slave. If there is no unit above it, then it becomes the
Master.
ASPEN RS-232 Port
Here is the wiring diagram for the ASPEN RS-232 Port
for connecting to a PC.
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
DCD
RX
TX
DTR
GND
DSR
RTS
CTS
RI
TX
RX
GND
Host
Serial
Port
(PC)
ASPEN
RS-232
Port
Wiring Diagram
ASPEN Device to PC
DTE pin
functions
Female
connector
Male
connector
DCE pin
functions
Female
jack
Male jack
Crestron®RS-232 Port Wiring
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
RX
TX
GND
TX
RX
GND
Crestron
RS-232
Port
ASPEN
RS-232
Port
Wiring Diagram
Female
connector
Male
connector
Female jack Male jack

SPN Conference
LECTROSONICS, INC.
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Software and Firmware
Updates
Check for the latest versions of the control panel soft-
ware and to see that the hardware includes the latest
firmware.
ASPEN models with a front panel LCD will display the
firmware version on the LCD and in the control panel
GUI after the software is installed. Other models display
the firmware version in the GUI only. Firmware updates
require that the ASPEN software be installed to enable
a connection and use the update utility included in the
software.
Firmware
version
Firmware version
Obtaining Updates
The latest versions of software and firmware are pro-
vided on the disk supplied with the unit and download-
able from:
Link on home page: http://www.lectrosonics.com
ASPEN Software: Uninstall any previous version be-
fore installing an updated version.
Downloaded files arrive in a .zip format. Extract the files
to a folder on your local drive and then run “setup.exe”
to install the program.
Firmware Updates: Downloaded files arrive in a single
.zip file with the model number and version indicated by
the filename.
Extract the file to a folder on your local drive. The result-
ing filename will indicate the model number and ver-
sion, followed by the extension “.update.”
Creating an ASPEN
Installer Disk
To create an Aspen Install Disk, go to the following site
and download the ASPEN Installation Disk .iso file.
www.lectrosonics.com>SUPPORT
Link from the home page:
Save the file to your local drive in a familiar location.
Open a disk copier utility such as Roxio Classic and
select the operation to Burn from a Disk Image File.
NOTE: The .iso file cannot be simply copied to the
disk. The disk recording utility must run a process
that creates a disk from a stored image file.
The .iso file format is recognized by almost any disk
creation software.

Installation and Startup Guide
Rio Rancho, NM 11
Firmware Update
Procedure
1) Install ASPEN software. See the next page for an
example of the installation procedure.
2) Launch the software. After the panel opens, click
on File > Update. The Update Wizard screen will
open to confirm that the software is ready for a
firmware update, with instructions on connecting
and configuring the processor.
3) On the processor, hold the recessed pushbutton
switch in with a pen or paper clip and turn on the
power to the processor. The unit will boot into the
Firmware Update... mode and the white Alert LED
on the processor front panel will glow.
Recessed pushbutton for firmware updates
4) Connect the processor to the computer with the
USB cable. When the USB connection is confirmed
(typically with a beep sound on the computer),
continue by following the on screen prompts in the
Update Wizard.
5) When prompted, use the “Browse” button to point
at the firmware update file and click Next to con-
tinue.
Browse
button
6) Do not disturb the USB cable connection during
the update process. The firmware update takes up
to 15 minutes to complete. Be sure the computer
does not “Time Out” during the update process.
7) When the update is complete, click Finish to exit
the Update Wizard.
8) Cycle the power on the processor to restart using
the updated firmware.
MCU Recovery from Interrupted Firmware
Update Procedure
If instructed to do so by Lectrosonics Customer Sup-
port, the firmware in a non-functioning unit can be
restored.
Launch the Control Panel program. After the panel
opens, click on Connect->Update Firmware...
In the lower part of the screen is a check box that is
used only for the recovery process. When the box is
checked, the instructions will change to describe the
recovery procedure.
Recovery check box
Follow the on-screen prompts to return the unit to nor-
mal operation.

SPN Conference
LECTROSONICS, INC.
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Software Installation
NOTE: Uninstall previous version before installing
the software.
The example shown here illustrates the installation pro-
cedure using Windows XP. The screens that appear at
each step using another operating system will vary, but
the general steps are very similar.
Insert the disk into the drive and wait for the opening
screen to appear. Click on Install ASPEN Software to
launch the installer.
When the Welcome screen appears, click on Next.
The End User License Agreement screen appears.
Click on I Agree, then on Next to continue.
It is usually best to accept the default folder for the
installation. Click on Next to continue.
Click on Next to confirm the installation and continue.
When the installation is complete the final screen will
appear. Click on Close to finish the installation.

Installation and Startup Guide
Rio Rancho, NM 13
USB Driver Installation
The example shown here illustrates the installation pro-
cedure using a Windows operating system. The screens
that appear at each step using another operating sys-
tem will vary, but the general steps are very similar. The
driver installation only needs to be done once on each
PC that will be connected to an ASPEN unit.
Visit http://www.lectrosonics.com, hover your mouse
over Support and click on Aspen Support, then USB
Drivers.
Download the USB Driver Installer.
A zipped file will appear.
NOTE: You must first click on “Extract All” in order
to install the appropriate drivers.
Two versions of the installer are included, one for 32-bit
Windows PCs and another for 64-bit Windows PCs:
• “dpinst-x86.exe” for 32-bit Windows
• “dpinst-amd64.exe” for 64-bit Windows
To start the installer:
Double-click on the appropriate .exe file.
The ASPEN Device Installer opens.
Click Next to proceed.
The End User License Agreement is presented.
Accept, then click Next to proceed.
When installation is complete, the Driver Name and
Status are displayed. Click Finish to close the Device
Installer.

SPN Conference
LECTROSONICS, INC.
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Minimum Setup
A required minimum setup is needed to allow the
SPNConference processor to pass signals and provide
acoustic echo cancellation:
• Define the Inputs and adjust gain
• Define the Crosspoints
• Define the Outputs and adjust levels
• Define the AEC Reference Mix
• Define the AEC Signal Mix
NOTE: See page 17 for Multi-site Bridging Setup
Launch the ASPEN Control Panel. The first screen is
blank with tabs at the top of the window to select the
desired action.
Select the Connect tab and then click on the method
of communication (USB in this example). A window will
open displaying the Master unit connected to the com-
puter. Click on OK to continue.
This popup will
appear with
the Master unit
displayed
Click on OK to continue
Click on the
connection method
NOTE: It normally takes a few moments for the
Master to detect all slaves below it after power up.
The next screen includes a list of all connected proces-
sors in the left side of the panel. Click on the desired
unit in the list to open a control panel for that processor.
Click on the desired unit in the
list of connected processors.
The panel opens to the Activity window, which is a real
time level display.
Click on the Inputs tab to open the setup screen and
define the inputs that will be used for the basic setup.
Click on the Matrix tab to open the setup screen and
define the crosspoints for the basic signal routing.
Click on the Output Source tab and define the signals
to appear at the desired outputs.
Click here to scroll tabs

Installation and Startup Guide
Rio Rancho, NM 15
Click on the Outputs tab and set the output levels.
Setup the conferencing activity and telephone settings
on the Conferencing screen. Scroll to the right to ac-
cess the tab.
NOTE: See page 17 for Multi-site Bridging Setup
Scroll tabs
Conferencing Tab
Define the signal routing for AEC activity on the Acous-
tic Echo Canceller screen. Enable this screen by
clicking on the AEC tab located near the bottom of the
control panel screen.
Define the final mixes
to be used for the AEC
Reference and AEC
Signal Mixes
AEC Tab
Set up the SPNConference to generate the AEC
Reference mix (far side signals entering the local
room). Assign the Tel and Codec sources to the final
mix in the matrix setup screen in the SPNConference
processor (Final Mix 48 in this example).
SPNConference
Assign far side signals to a final
mix for the AEC Reference
Set up the SPN mixer to generate the AEC Signal
mix (local microphones and media sources to be
sent to the far side). Assign these signal sources in
the matrix tab of the SPN mixer connected to those
sources (SPN1624 and Final Mix 47 in this example).
SPN1624
Assign local microphones to a
final mix for the AEC Signal
The Device Settings tab opens access to several setup
screens such as Preset Management where the setup
can be stored for later recall.
Device Settings tab
Category bar for access to
setup screens

SPN Conference
LECTROSONICS, INC.
16
Stacking Multiple Units
If Slave units are not powered up when the Master unit
boots up, the Slave may not be detected for several
minutes. It is good practice to turn all units on simul-
taneously or turn on Slave units before turning on the
Master unit.
The available processors will appear in a “stack” on the
left side of the control panel. The Master unit will appear
at the top of the stack, with Slave units below it appear-
ing in the order that they are connected with the cable
connections to the ASPEN port jacks.
List of connected units
Refer to the cabling diagram for the ASPEN ports in the
section entitled Hardware Installation.
Refer to the Help Files
Once the processors are installed, configured and com-
municating with a computer system, refer to the Help
files in the software GUI for additional information re-
garding the available settings, adjustments and control.

17
Special Section - Multi-site Bridging
Multi-site Bridging Setup
First, set up the processor for local sound reinforcement
with input and output levels adjusted, and crosspoints
defined for local sound reinforcement. Refer the the
previous section entitled Minimum Setup for details.
Multi-site bridging requires a minimum of four mixes to
route the signals needed for a conference:
• AEC REFERENCE MIX
• AEC SIGNAL MIX
• SEND MIXES (includes the AEC output)
• LOCAL MIXES
The AEC REFERENCE MIX is a mix of the far side
signals routed to the AEC for echo cancellation. We
recommend that you use mix bus 48 for this mix.
The AEC SIGNAL MIX is a mix of the local microphone
signals which is routed to the AEC. The AEC then iden-
tifies and cancels the far side signals that have entered
the microphones along with the local audio. We recom-
mend that you use mix bus 47 for this mix.
The SEND MIXES consists of 3 signal sources:
• The AEC output, which is a mix of all the local
microphones after echo cancellation.
• Multimedia sources to be delivered to any one or
all far sides.
• Far side signals to be routed to the other far sides.
With regard to bridging, you will need to assign a bus
for each outbound signal. For example, if you have just
a telephone line, you will only need one SEND mix for
the Tel Line Out. If you have one phone and two Co-
decs, you will need three SEND mixes, one mix each
for the Tel Line Out, Codec 1 Out and Codec 2 Out. We
recommend you use the mix busses 46, 45, 44, etc. for
these signal mixes.
The LOCAL MIX includes the far end signals, program
audio, and any local microphones that require amplifica-
tion. Mix-minus can be on multiple busses to improve
gain-before-feedback. We recommend that you use mix
busses 1, 2, 3, etc. for these mixes to keep them well
separated in the matrix from the mixes used for confer-
ence connections. There is no technical or performance
reason for this separation; it simply makes it easier to
visualize the matrix during setup.
AEC Reference Mix
The AEC Reference Mix should carry ONLY the incom-
ing signals from the far side (telephone and codecs)
which is the inbound part of any two way communica-
tions line. DO NOT put any microphones or local line
level sources (such as multimedia inputs) on this mix.
AEC
Signal
Input
Ref
Input
Tel Line In
148
47
463
2
SPNConference
SPN1624
45
44
Codec 1 Out
Codec 2 Out
Codec 2 In
Codec 1 In
Tel Line Out
AEC in (Signal Mix)
AEC out ( to Far Side)
AEC Reference Mix
AEC out ( to Far Side) AEC out ( to Far Side)
Local Mixes
Signal added to mix (matrix)
Mixes for output signals (outsource)
AEC Reference Mix
AEC Reference Mix
SPNConference
Processor
Matrix Tab

18
Special Section - Multi-site Bridging
AEC Signal Mix
This mix should include ONLY the local microphones,
with no multi-media sources and no line level inputs.
AEC
Signal
Input
Ref
Input
Tel Line In
148
47
463
2
SPNConference
SPN1624
45
44
Codec 1 Out
Codec 2 Out
Codec 2 In
Codec 1 In
Tel Line Out
AEC in (Signal Mix)
AEC out ( to Far Side)
AEC Reference Mix
AEC out ( to Far Side) AEC out ( to Far Side)
Local Mixes
Signal added to mix (matrix)
Mixes for output signals (outsource)
AEC Signal Mix
AEC Signal MIx
SPN1624
Processor
Matrix Tab
Enable the AEC and Define the Inputs
Navigate to the AEC setup screen in the SPNConfer-
ence processor and select the Reference and Signal
mixes for the inputs to the AEC.
Scroll to the right and select
the Conferencing tab
Select the Acoustic Echo
Canceller tab
Enable the AEC and define the busses
for the Signal and Reference mixes

19
Special Section - Multi-site Bridging
SEND Mixes
Assign the output of the AEC plus any multi-media
sources to the mixes used to SEND audio to the far
sides.
The far side Codec and Telephone signals are routed in
a mix-minus fashion so that each of them is sent to the
outputs feeding the other two, but not back to itself:
Input Outputs
Tel Line In Codec 1 Out, Codec 2 Out
Codec 1 In Tel Line Out, Codec 2 Out
Codec 2 In Tel LIne Out, Codec 1 Out
AEC
Signal
Input
Ref
Input
Tel Line In
148
47
463
2
SPNConference
SPN1624
45
44
Codec 1 Out
Codec 2 Out
Codec 2 In
Codec 1 In
Tel In + Local
Codec 1 + Local
Codec 2 + Local
Tel Line Out
AEC in (Signal Mix)
AEC out ( to Far Side)
AEC Reference Mix
AEC out ( to Far Side) AEC out ( to Far Side)
Local Mixes
Signal added to mix (matrix)
Mixes for output signals (outsource)
SEND Mix
BE CAREFUL WITH THE SEND MIX! Make
certain that you do not accidentally route the
incoming telephone signal back to itself on the
outgoing telephone SEND mix, or a Codec back to
itself, etc!
Assign the AEC output to the
SEND mixes for the far side
Define the inputs for the far side SEND signals (the
AEC output) in the Conferencing Outputs screen.
Select the Output Source tab
Select the Conferencing Outputs tab
Define the Final Mixes for the far
side SEND signals as follows:
• TEL: Final Mix 44
• CODEC 1: Final Mix 45
• CODEC 2: Final Mix 46
Route the TEL and CODEC signals from the far side
through the matrix in a mix-minus configuration so
that they do not connect back to themselves

20
Special Section - Multi-site Bridging
LOCAL Mixes
These mixes deliver the audio from the far sides and
the microphones into the room. Signal routing for local
sound reinforcement often uses a mix-minus configura-
tion to reduce feedback in the local sound system and
echo heard at the far side. To keep picture and audio
together for a more realistic environment, telepresence
systems normally route the far side audio to loudspeak-
ers next to the video monitor for that far side.
In the following example, crosspoints are shared be-
tween far side signals and local microphones, but this is
not always the case.
AEC
Signal
Input
Ref
Input
Tel Line In
148
47
463
2
SPNConference
SPN1624
45
44
Codec 1 Out
Codec 2 Out
Codec 2 In
Codec 1 In
Tel In + Local
Codec 1 + Local
Codec 2 + Local
Tel Line Out
AEC in (Signal Mix)
AEC out ( to Far Side)
AEC Reference Mix
AEC out ( to Far Side) AEC out ( to Far Side)
Local Mixes
Signal added to mix (matrix)
Mixes for output signals (outsource)
LOCAL Mixes
TEL and CODEC far end signals are routed
to busses feeding the local sound system
NOTE: In a telepressence system, far side signals
would typically be routed to the loudspeakers
located next to the video monitor for that far side.
Microphones are routed to feed signals to
output channels feeding loudspeakers
In some acoustic spaces it is beneficial to configure
crosspoints that would normally be disabled in the
Phantom Mix mode.