Shure ST3500 User Guide

ST3500

Teleconferencing System

Installer's Guide

TABLE OF CONTENTS
PRODUCT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	2
MAJOR FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	2
SYSTEM COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	2
SYSTEM FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	2
DigiMix Microphone Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	2
Adaptive Echo Cancellation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3
Expansioncapabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3
ACOUSTIC MODULE CONTROLS AND INDICATORS . . . . . . . . . . . . . . . . .	4
USER SELECTABLE PARAMETERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	.5
TELEPHONE INTERFACE BOX CONNECTORS . . . . . . . . . . . . . . . . . . . . . .	6
TELEPHONE INTERFACE BOX MOUNTING . . . . . . . . . . . . . . . . . . . . . . . . . .	6
Horizontal (Floor) Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6
Vertical (Wall) Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	7
SINGLE ACOUSTIC MODULE PLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . .	8
BASIC SYSTEM INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	9
EXPANSION MODULE PLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	10
EXPANDED SYSTEM INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	11
OPERATING THE SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	12
Placing a Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	12
Answering a Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	12
Using the Mute Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	13
Using the Flash Function ..............................................	14
Switching to Tone Dialing in Pulse Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	14
Hangingup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	14
Using the Automatic Redial Function ....................................	15
PREVENTIVE MAINTENANCE ..................................... .	15
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	16
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	17
TELEPHONEINTERFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	18
REPLACEMENTPARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	18
ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	19
SERVICEANDREPAIRS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	19
FCCREQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	19
APPENDIX I:WHAT IS DlGlMlX AND WHAT DOES IT DO? . . . . . . . . . . . .	20
APPENDIX II:ST3500 FEATURES AND BENEFITS . . . . . . . . . . . . . . . . . . .	22
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 installingor 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-basedteleconferencing system to provide automatic microphone selection. The Shure DigiMix~~algorithm 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.

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-inaccess 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 360°, with no "dead areas." It also includes a loudspeakerthat 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.

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 distinguishes between constant background sound (e.g., air conditioners) and rapidly changing sound (e.g., speech). This function continuously adjusts the "trigger" threshold so that only those sounds louder than background noise activate a microphone or an acoustic module.

MaxBus" improves audio quality by limiting the number of activated microphonesto one per talker. With MaxBus, one talker activates only one microphone (the closest one).

Last Mic Lock-on maintains a seamless background ambiance by 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 NoiseAdaptiveThreshold, 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.

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: ERLE 24 dB typical. Line Echo Canceler: ERLE 36 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 diminished. If participants are seated more than 1.8 meters (6 feet) away from 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 STLM35E expansion modules can be used to extend the basic system's coverage.The maximum number of expansion modules that can be added to an ST3500 is two. If a wireless microphone receiver is pluggedinto one of the ST35003 expansion ports, only one additional acoustic module can be added.

NOTE: Only one expansion module can be connected to each expansion port on the main ST3500. Additional expansion modules cannot be connected in "daisy+hainV fashion.

3

ACOUSTIC MODULE CONTROLS & INDICATORS (Figure 1)

ACOUSTIC MODULE CONTROLS AND INDICATORS

FIGURE 1

1.Dial Pad: Standardtelephone keypad; DTMF or pulse capable, switchable via Option Switch 4, located on the bottom of the module.

2.OnIOff Key: Turns the acoustic module on; also picks up incomingcalls and is usedto hang up the telephone line when a teleconferenceis over.

3.Volume UpIDown Keys: Raise and lower volume in 1 dB steps. Range is +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.

5.FlashIRedial Key: Press only the FlashIRedial key to redial the last 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 providedwith your phone system, press the FlashIRedial key and any number key. This will clear the last phone number dialed and enable the Flashfunction. Answering an incomingcall also clears the last number dialed and enables the Flash function.

6.Interface Box Jack: RJ-typejack 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 C116 adapter should be connectedto the expansionports. Theproprietary ST3500 expansion interface will not work with other external microphonesor loudspeakers.

8.Loudspeaker: Distributessound evenly around a full 360".

9.Directional Condenser Microphone (3 Total): Provide uniform coverage over 360°.

USER SELECTABLE PARAMETERS (FIGURE 2)

ST3500 ACOUSTIC MODULEOPTION SWITCHES

FIGURE 2

Position

Default

OFF

1	2	3	4	5
Tone	Room Reverb	Bass Boost	Ringer	No
Dialing	Compensation			Function

7						ON	ON
ON	OFF		OFF
Programs	Compensates				Programs
system for	for highly rever-		frequencies		Module		to
DTMFwith	orberantwhen therooms,dis-				ring when a
			centered		call is		re-
(tone)	tant party is us-		around	400	ceived.
phone	ing a	phone.
systems.	Adds 18 dB via
	non-linear pro-		The	Bass
	cessing.		Boost setting
	The ST3500 is		should	only
			be changed
	not as interac-		when	the
	tive when this		ST3500	is
	switch is on.		turned off
Programs	Programs sys-		Programs		Programs
system for	tem for	use in	loudspeaker		Module not
			output	for	to ringwhen
pulse	acoustically		standard		a call is re-
(rotary)	treated rooms.		sound quality.		ceived.
phone
	change	switch
	setting	while
	system is on.

NOTE: Switch 5 is inactive, and does not affect any system function.

TELEPHONE INTERFACE BOX CONNECTORS

FRONT

TELEPHONE INTERFACEBOX CONNECTIONS

FIGURE 3

1.Acoustic Module Cable Connector: Provides a link between to the ST3500Acoustic Module. Plugone end of the supplied 7.6 meter (25 ft) cable into this connector and the other end into the acoustic module.

2.Auxiliary Output Connectors 1 and 2: These unbalanced phonojacks are for line levelauxiliary equipmentsuch as VCRs. Itoutputsthe receive input signal, received telephone signal, and locally miked signals.

3.Power Input Connector: Mates with a detachable, 3-conductor power cord. The ST3500 operates on 90 to 132 Vac, 50160 Hz 250 mA power.

4.Extension Telephone Connector: Modular RJ-type connectors connect to an external telephone set via a standard telephone cable with modular RJ-typeconnectors.

5.RJ11 Telephone Line Connector: Modular RJ-type connectors connect to an analog telephone system via a standard telephone cable with modular RJ-type connectors.

TELEPHONE INTERFACE BOX MOUNTING

Horizontal (Floor) Mounting. To mount the telephone interface box horizontally, attach the supplied rubber feet and place the unit on the floor, or on a table, credenza or bookshelf. See Figure 4. Make sure the cable to the 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	8 -1\RUBBERFEET
I	I

FLOOR OR TABLE TOP

TELEPHONE INTERFACE BOX MOUNTING

FIGURE 4

Vertical (Wall) Mounting. To mount the telephone interface box onto a vertical surface such as a wall, proceed as follows:

1.Inserttwo screws perpendicularto the mountingsurface so that they are

101.6mm (4 in.) apart and line up horizontally. If necessary, use a drill and supplied screws and anchors. Refer to Figure 5 below and the hole template in the left margin of this page.

SCREWS 1 1

0vd o ' & , m m , 0

WALL MOUTING HOLES

(BOTTOM PANEL)

TELEPHONE INTERFACE BOX MOUNTING

3	FIGURE5

g 2. Positionthe 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: The mounting surface and screws must be capable of supporting a static load equal to four times (4X) the weight of the Telephone lnterface Box. Refer to the following specifications:

TelephoneInterface Box Weiaht	Wall Support Requirements
1.36 kg (3Ibs)	5.44 kg (12 Ibs)