Shure ST3500 User Guide
ST3500
Teleconferencing System
Installer's Guide
TABLE
OF CONTENTS
PRODUCT DESCRIPTION
MAJOR FEATURES
SYSTEM COMPONENTS
SYSTEM FEATURES
DigiMix Microphone Selection
Adaptive Echo Cancellation
Expansioncapabilities
ACOUSTIC MODULE CONTROLS AND INDICATORS
USER SELECTABLE PARAMETERS
TELEPHONE INTERFACE BOX CONNECTORS
TELEPHONE INTERFACE BOX MOUNTING
Horizontal (Floor) Mounting
Vertical (Wall) Mounting
SINGLE ACOUSTIC MODULE PLACEMENT
BASIC SYSTEM INSTALLATION
EXPANSION MODULE PLACEMENT
EXPANDED SYSTEM INSTALLATION
OPERATING THE SYSTEM
Placing a Call
Answering a Call
Using the Mute Function
Using the Flash Function
Switching to Tone Dialing in Pulse Mode
Hangingup
Using the Automatic Redial Function
PREVENTIVE MAINTENANCE
TROUBLESHOOTING
SPECIFICATIONS
TELEPHONEINTERFACE
REPLACEMENTPARTS
ACCESSORIES
SERVICEANDREPAIRS
FCCREQUIREMENTS
APPENDIX
APPENDIX
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I:
WHAT IS DlGlMlX AND WHAT DOES IT DO?
II:
ST3500 FEATURES AND BENEFITS
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WARNING:
NEVER install telephone wiring during a lightning storm
.
NEVER install telephone jacks in wet locations unless the jack
is specifically designed for wet locations
.
NEVER touch uninsulated telephone wires or terminals unless
the telephone line has been disconnected at the network interface
.
ALWAYS USE CAUTION when installing or modifying telephone
.
lines
PRODUCT DESCRIPTION
The Shure ST3500 is an expandable, full-duplex, portable audio
teleconferencing system that can be used in virtually any conference room.
It utilizes digital signal processing (DSP) to accomplish acoustic and line
echo cancellation. It also is the first DSP-based teleconferencing system to
provide automatic microphone selection. The Shure
improves voice intelligibility by reducing the amount of unwanted
reverberation and background noise picked up by the system. It also
automatically selects the microphone (or, in expanded systems, the best
acoustic module) closest to the talker as the talker begins to speak and
keeps it on until another microphone is activated.
DigiMix~~ algorithm
SYSTEM COMPONENTS
Each ST3500 system is supplied with the following:
An ST3500 Acoustic Module
An STIB35 Telephone Interface Box
A Telephone Line Cord
A Power Cord
A
7.6
meter (25 ft) telephone interface box-to-Main Module Cable
A User's Guide
A Quick Reference Card
The basic system consists of a telephone interface box and a desktop
acoustic module linked by a detachable 7.6 meter (25 foot) interface cable.
The compact telephone interface box provides plug-in access to an analog
telephone system and can be wall-mounted to minimize table clutter. The
acoustic module includes three surface-mounted unidirectional condenser
microphones that provide uniform coverage over
areas." It also includes a loudspeaker that distributes sound evenly around
a full
360". The acoustic module and the telephone interface box are
connected by a single, detachable 7.6 meter (25 foot) shielded cable.
360°, with no "dead
SYSTEM FEATURES
DigiMix" Microphone Selecton
Operationally similar to the Shure IntelliMix gating system, the DigiMix
concept combines three functions:
Noise Adaptive Threshold
MaxBus
Last Mic Lock-on
Noise Adaptive Threshold
(e.g., air conditioners) and rapidly changing sound (e.g., speech). This
sound
function continuously adjusts the "trigger" threshold so that only those sounds
louder than background noise activate a microphone or an acoustic module.
MaxBus"
microphones to one per talker. With MaxBus, one talker activates only one
microphone (the closest one).
Last Mic Lock-on
keeping the most recently activated microphone open until a newly
activated microphone takes its place. Without Last Mic Lock-on, all
microphones could turn off during pauses in conversation, creating the
perception that the audio signal had been lost.
By combining Noise Adaptive Threshold, MaxBus, and Last Mic Lock-on,
DigiMix brings reliable microphone selection technology to the world of
audio teleconferencing. As a result, the ST3500 can provide the best
possible sound quality, even in large, acoustically challenging rooms.
improves audio quality by limiting the number of activated
maintains a seamless background ambiance by
distinguishes between constant background
Adaptive Echo Cancellation
The ST3500 uses fully adaptive acoustic and line echo cancellation. The
echo cancellation algorithm constantly monitors its environment and
attempts to optimize performance. The "adapting" process can take time,
especially when the system is first turned on. Best performance will always
be achieved a minute or two into the call, after the system has thoroughly
adapted to acoustic and phone line conditions. Once this has occurred, the
following performance levels can be expected:
Acoustic Echo Canceler:
Line Echo Canceler:
ERLE
ERLE
24
36
dB typical.
dB typical.
Expansion Capabilities
Each ST3500 acoustic module picks up sounds within a radius of 6 to 8 feet.
Although talkers beyond this distance can still be heard, the sound quality is
If
diminished.
the main ST3500 acoustic module, up to two additional acoustic modules
should be added to provide uniform coverage. ST3500 acoustic modules,
ST350 acoustic modules, or dedicated
used to extend the basic system's coverage.
expansion modules that can be added to an ST3500 is
microphone receiver is plugged into one of the
one additional acoustic module can be added.
NOTE: Only one expansion module can be connected to each
expansion port on the main
cannot
3
participants are seated more than
STLM35E expansion modules can be
ST3500.
be
connected in "daisy+hainV fashion.
1.8
meters
The maximum number of
ST35003 expansion ports, only
Additional expansion modules
(6
feet) away from
two.
If a wireless
ACOUSTIC MODULE CONTROLS & INDICATORS
(Figure
1)
ACOUSTIC MODULE CONTROLS AND INDICATORS
FIGURE
1
1. Dial Pad: Standard telephone keypad; DTMF or pulse capable, switchable
4,
via Option Switch
2.
OnIOff Key: Turns the acoustic module on; also picks up incoming calls
located on the bottom of the module.
and is used to hang up the telephone line when a teleconference is over.
3. Volume
is
UpIDown Keys: Raise and lower volume in 1 dB steps. Range
+I
2
dB. The Shure logo will flash at each step; it stops flashing when
either the minimum or maximum limits are reached.
4.
Mute Function: Touch the black disk around the Shure logo to mute or
unmute the module. In the mute mode, the Shure logo glows red. Note
that the black disk simply needs to be touched, not "pressed." Touching
the Shure logo does not have any effect on system status.
FlashIRedial Key: Press only the FlashIRedial key to redial the last
5.
phone number entered (up to 16 digits long). To clear the last number
dialed and enable the Flash function so you can access the custom
calling features provided with your phone system, press the
FlashIRedial
key and any number key. This will clear the last phone number dialed and
enable the Flash function. Answering an incoming call also clears the last
number dialed and enables the Flash function.
6. Interface Box Jack: RJ-type jack connects the Acoustic Module to the
supplied
STIB35 interface box via a 7.6 meter
(25
foot) cable.
7. Expansion Ports: RJ-type jacks connect the main module to expansion
modules. A wireless microphone receiver can also be connected to an
expansion port via a C116 cable adapter.
NOTE:
Only an STLM35E, ST350, ST3500, or a
C
11
6
adapter should
be connected to the expansion ports. The proprietary ST3500 expansion
interface will not work with other external microphones or loudspeakers.
8.
Loudspeaker: Distributes sound evenly around a full 360".
9.
Directional Condenser Microphone
coverage over
360°.
(3
Total): Provide uniform
USER SELECTABLE PARAMETERS (FIGURE
2)
Position
Default
OFF
ST3500 ACOUSTIC MODULE OPTION SWITCHES
1
Tone
Dialing
ON
Programs Compensates
system for for highly rever-
7
DTMF with or berant when the rooms, dis(tone) tant party is us-
phone ing a phone.
systems. Adds
Programs Programs syssystem for tem for use in
pulse acoustically
(rotary) treated rooms.
phone
2
Room Reverb
Compensation
OFF
18
non-linear processing.
The ST3500 is
not as interactive when this
switch is on.
change switch
setting while
system is on.
dB via
FIGURE
2
3
Bass Boost
OFF
frequencies
centered
around 400
The Bass
Boost setting
should only
be changed
when the
ST3500 is
turned off
Programs
loudspeaker
output for
standard
sound quality.
4
Ringer
ON
Programs
Module to
ring when a
call is received.
Programs
Module not
to ring when
a call is received.
5
No
Function
ON
NOTE:
Switch 5 is inactive, and does not affect any system function.
TELEPHONE INTERFACE BOX CONNECTORS
FRONT
TELEPHONE INTERFACE BOX CONNECTIONS
FIGURE
1.
Acoustic Module Cable Connector:
ST3500 Acoustic Module. Plug one end of the supplied 7.6 meter (25
cable into this connector and the other end into the acoustic module.
2.
Auxiliary Output Connectors 1 and
are for line level auxiliary equipment such as VCRs. It outputs the receive
input signal, received telephone signal, and locally miked signals.
Power Input Connector:
3.
Mates with a detachable, 3-conductor power
cord. The ST3500 operates on 90 to 132
4.
Extension Telephone Connector:
connect to an external telephone set via a standard telephone cable with
modular RJ-type connectors.
5.
RJ11
Telephone Line Connector:
connect to an analog telephone system via a standard telephone cable
with modular RJ-type connectors.
3
Provides a link between to the
2:
These unbalanced phono jacks
Vac, 50160
Hz
250 mA power.
Modular RJ-type connectors
Modular RJ-type connectors
ft)
TELEPHONE INTERFACE BOX MOUNTING
Horizontal (Floor) Mounting.
horizontally, attach the supplied rubber feet and place the unit on the floor, or
on a table, credenza or bookshelf. See Figure
acoustic module lies flat and is not twisted. Make sure it does not present a
traffic hazard. It may be taped to the floor or carpet, if desired.
u
I
TELEPHONE INTERFACE BOX MOUNTING
To mount the telephone interface box
4.
Make sure the cable to the
8
FLOOR OR TABLE TOP
FIGURE
4
-1\
RUBBERFEET
I
Vertical
vertical surface such as a wall, proceed as follows:
1.
Insert two screws perpendicular to the mounting surface so that they are
101.6
and supplied screws and anchors. Refer to Figure
template in the left margin of this page.
(Wall)
mm
Mounting.
(4
in.) apart and line up horizontally. If necessary, use a drill
To mount the telephone interface box onto a
5
below and the hole
SCREWS
11
0
do'&,m_m,
0
v
WALL
MOUTING
(BOTTOM
TELEPHONE INTERFACE BOX MOUNTING
3
g
2.
Position the telephone interface box so that the holes in the bottom panel
P
are over the screw heads, then slide the it down until it rests securely on
4
%
the screws. Make sure the cables do not present a traffic hazard. They
may be taped to the floor or carpet. Make sure the cable is free of twists.
Q
I
CAUTION:
supporting a static load equal to four times
Telephone lnterface Box. Refer to the following specifications:
Telephone Interface
The mounting surface and screws must be capable of
Box
1.36
kg
(3
Ibs)
FIGURE
Weiaht
5
Wall Support Requirements
(4X)
5.44
HOLES
PANEL)
the weight of the
kg
(12
Ibs)
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