Polycom EF200 User Manual

CHOFREE

EF200

™

HONE

SER

ANUAL

Copyright © 1999 ASPI Digital. All rights reserved. Printed in the United States of America. Because of technical progress, specifications are subject to change without notice. EchoFree is a trademark and ASPI is a registered trademark of ASPI Digital.

ASPI Digital - The Sound of DSP 1720 Peachtree Street NW, Suite 220 Atlanta, GA 30309-2439 (404) 892-3200 www.echofree.com

Technical Support: (404) 892-3200 help@aspi.com

EF200UM-0100-99

EF200 U

SER MANUAL

Introduction.... ........ .............. .................... .............. ............. .............. ...........2

Product Features.......................... ............................................ ........ ........... ........... 3

Insta l lation.................. .............. .............. .................... ............. .............. .......4

Preparing for Installation....................................................................................... 4

EF200 Front and Rear Panels................................................................................ 5

Setting the DIP Switches......................................................................................... 7

Connecting the EF 200 to Other Equipment........ ............................... .......... ..........9

Configuring the Non-Volatile Memory................................................................... 10

Calibrating the EF200 Audio Signal Levels........................................................... 12

Connecting Multiple EF200s................................... .......... .................... ................. 13

Mounting the EF200..................... ............................................ .............................. 14

Using the Logic In/Out Port ................................................................................... 15

Operating the EF200 ...................................................................................17

Using the EF200 Without RS-232 Control........................................... ..................17

Using the EF200 with RS-232 Control................................................................... 17

Troubleshooting...........................................................................................19

Residual Echo......................................................................................................... 19

Can’t Receive Calls or Dial Out............................................................................. 19

Can’t Get Caller ID Information............................................................................ 20

Remote Control Problems....................................................................................... 20

Contacting Technical Support ................................................................................ 21

Technical Specifications ..............................................................................22

Compliance............................................................................................................. 22

Warran ty Informa ti o n ..... .............. ................................. .......................... ..24

EF200 Command Set Reference.................................................................26

Command Syntax........................ .................... ..................... .......... .................... ..... 26

EF200 Block Diagram ................................................ .................................69

Connector Pinouts........................................................................................70

NTRODUCTION

EF200 U

SER MANUAL

Congratulations!

About This Manual

Product Description

Congratulations on your purchase of the EchoFree™ EF200 Phone Add. By choosing ASPI Digital’s EchoFree products, you are investing in cutting edge DSP technology that will help provide the best possibl e audio quality for your syste m.

This manual expla in s how to insta ll, co nfigure, and cal ibrate the EF200 i n any syste m that needs a two-wire to four-wi r e interface. It also provides in formation about operating and troubleshooting the EF200.

The EchoFree™ EF200 Phone Add provides a full duplex interface between a fourwire audio syste m and a two-wire telephone line. It al lows a telephone caller to be brought in to any four-wire audio system, such as a distance learning or videoconferencing system. The EF200 is similar to a digital hybrid, but with many more fea tures and capabilities.

The primary function of the EF200 is the line echo canceller (LEC), which digitally eliminates reflections from the telephone hybrid. The LEC algorithm features extremel y fas t adaptation and exc ellent full duplex operation. This allows n atural communication wit hout half- duplex be havior or resi dual echo. The LEC algorit hm is G.165 and G.168 compl iant, which ensure s relia ble, pro ven performa nce. Be cause of its rapid adapta tion, the EF200 requires no training noise. This means that callers don’t get blasted by white noise at the beginning of the connection.

Unlike other phone adds , the EF200 also includes an advanced noise suppress ion algorithm, which improves the signal to noise ratio of incoming tele phone signals by up to 10 dB, without adding distortion or “musical noise” to the speech signal. This greatly improves overall speech quality for all par ticipants when callers are in a noisy environment or are us ing a noisy connecti on such as a cellular phone .

Automatic gain c ontrol ensures consistent audio leve ls , compensating for diffe rences between different lines and handsets . This means users don’t have to change volum e levels when they s w itch from local to long distance calls. Automatic gain control, line echo cancellation, and noise suppression all work together to ensure consist ently high audio quality every time you make a call.

The EF200’s telep hony features enhance its usefulness in integra ted systems. The DTMF dialing and Cal l P r ogress capabilities help make dialing intuitive, through a remote control device. The ring and entry tone generation capability allows users to hear when someone is “ringing” the EF200, even if an analog handset is not connected to the system. The DTMF detection feature allows integrators to add touc h tone remo te control capability to th eir system s.

These features make the EF200 the most advanced device of its kind. Cutting edge DSP technology gives it the best sound quality available. The wi de range of features and controllability make the EF200 extremely flexible, while providing a straightforward user interface for simple installations.

Warranty Registration

Please take a moment to fill out and return your warranty registra tion card. This information will help us to provide you with bette r cus tom er support.

NTRODUCTION

RODUCT FEATURES

• Easily connects to an Acoustic Echo Canceller (AEC) (such as the ASPI Digital EF400) or other four-wire system to add phone calls to co nferences.

• ASPI’s proprietary noise reduction algorithm reduce s static and hiss, to make conference more intelligible and comfortable.

• Built-in DTMF dialer and detector.

• Built-in Caller ID feature allows conference moderator to see who is calling in.

• User-set “entry” and “exit” tones give you the option to hear a pleasant tone when callers enter or leave t h e conference.

• Connection is quiet, non distrac ting.

• Automatic gain control on both the receive a nd transmit audio paths.

• Complete RS-232 control for operation through your room controller, including dialing out to a remote office.

• “Privacy” mode for private conversations with the people in the room, the party on the telephone, or the remote 4-wire party.

• Up to 32 EF200s can be linked together to form a simple conference bridge.

• Diagnostic information is available to syst em integrators and other personnel vi a the EF200’s RS-232 port, permitting remote trouble-shooting if necessary.

• LED bargraphs on the front panel, which are useful for visual indication of audio levels and proper s ys tem operation.

ASPI Digital -

The Sound of DSP

NSTALLATION

The installation process for the EF200 consists of the following steps:

1. Prepare for installation (below).

2. Configure the DIP switches on the rear panel (page 7).

3. Connect the EF200 to other equipment (page 9).

4. Configure the EF200’s non-volatile memory (if using RS-232) (page 10).

5. Calibrate the EF200 to other equipment in the system (page 12).

6. Mount the EF200 in a rack or on a tabletop (page 14).

REPARING FOR INSTALLATIO N

Reading the entire manual (or at least the in st allation section) before beginning the installation process will help you be more prepared for installation. Also, please make sure you have t he correct equipment (outlined below) before you begin installation.

EF200 U

SER MANUAL

What’s Included

What’s Not Included

The EF200 product packa ge includes the following items:

• EF200 User Manual (this manual)

• EF200 Phone Add

• External Power Supply

• Warranty Registration Card

The followin g equipm ent i s not inc luded wi th t he EF200 produ ct pac kage, but m ay be necessary to create a completely functional system:

• Microphone(s)

• Loudspeaker(s)

• Audio amplifie r (or am plified loudspea ker)

• EchoFree EF400 Acoustic Echo Canceller

• Audio cables

• Videoconferencing CODEC or other four-wire interface (optional)

• Tape recorder or VCR (optional)

• RS200 Rack Mount sh elf (included with purchase of EF200 and EF400 toge ther)

• RS-232 remote control device (optional)

NSTALLATION

EF200 F

POWER

)

TO ET

ESERVED

RONT AND REAR PANELS

TO PHONE FROM PHONE

LEVEL LEVEL

PRIVACY ON

21 3 4 5 6 7 8 9 1110

13 15 17

)

TO ET

ESERVED

AGC

PROM

UPPRESSION

ID 4

VERRIDE

OISE

EVICE

ID 3

EVICE

ID 2

EVICE

ID 1

EVICE

ID 0

EVICE

REMOTE CONTROLREMOTE CONTROL

RS-232

LOGIC IN/OUT

ASPI BUS

OUT

TO PHONE

TO LINE

PRIVACY REMOTE PHONE

REMOTE CONNECT

PHONE CONNECT

EF400

INTERFACE

FROM

AECTOAEC

FROM

REMOTETOREMOTE

T H E

S O U N D O F D S

EchoFree

EF200

5, 15 VDC 5, 15 VDC

POWER

14 16 18 19 20 21 22 23 24

Figure 1. EF200 Front and Rear Panels

OWER INDICATOR

1. P

ROM REMOTE GAIN TRIMPOT

2. F the F

O PHONE LEVEL INDICATOR

3. T line.

O REMOTE GAIN TRIMPOT

4. T

O REMOTE

ROM PHONE LEVEL INDICATOR

5. F telephone line.

RIVACY ON INDICATOR

6. P

EMOTE CONNECT INDICATOR

7. R nected.

HONE CONNECT INDICATOR

8. P is connected.

RIVACY BUTTON

9. P

EMOTE BUTTON

10. R

HONE BUTTON

11. P

12. DIP S

13. RS-232 R control devic e, such as a touch panel or personal computer COM port.

OGIC IN/OUT PORT

14. L

. When the LED is green, power is on.

ROM REMOTE

channel.

channe l.

. Push this button to turn pri vac y mod e on or off.

. Push this button to connect or disconnect remo te audio.

. Push this button to pic k up o r h ang up the telephone line.

WITCHES

EMOTE CONTROL PORT

. Connect this to logic switches for optional remote control.

. This adjusts the gain on the signal coming in on

. Displays the signal level going to the telephone

. This adjusts the gain on the s ignal going out on the

. Displ a y s the sig na l level co m i ng in from th e

. This LED is blue when privacy mode is on.

. This LED is green when the remote audio is con-

. This LED is green when the EF200 2-wire audio

. Connect this to an optional RS-232 remote

ASPI Digital -

The Sound of DSP

EF200 U

SER MANUAL

15. ASPI BUS IN. Connects to the ASPI BUS OUT of another ASPI Digital device or an ASPI Bus terminator, if the ASPI Bus is in use.

16. ASPI B

US OUT

. Connects to the ASPI BUS IN of another ASPI Digital device or

an ASPI Bus terminator, if the ASPI Bus is in use.

O PHONE

17. T

O LINE

18. T

19. EF400 I

. Connects to an analog telephone handset for manual dialing.

. Connects to the telephone line from th e wall socket.

NTERFACE

. Connects to an EF400 for remote control of the EF400 (not

currently implemented).

ROM

20. F

21. T

22. F

AEC. Connects to the remote output of the AEC.

AEC. Connects to the remote input of the AEC.

ROM REMOTE

. Connects to the audi o output of a CODEC or other 4-wire

device.

O REMOTE

23. T

OWER SUPPLY INPUT

24. P

. Connects to the audio input of a CODEC or other 4-wire device.

. Connects to the external power supply provided with the

EF200.

NSTALLATION

ETTING THE

DIP S

Note

Switches 1 & 2: Reserved

Switch 3: AGC Enable

Switch 4: Noise Suppression Enable

WITCHES

Locate the 10 position DIP switch on the left side of the EF200 rear panel. For the purpose of this dis cus sion, the switches are num bered one through ten, from left to right. The follo wing ins tructions expla in how to set each switch.

Changing the DIP switches will have no effec t until the EF200 is reset. Each time you change the set ting of the DIP switches, you must turn the EF200 off and back on for the changes to take effect.

Switches 1 and 2 are reserved, and should always be set to the off position.

When this switch is on, automat ic gain control is enabled on the telephone input signal when the EF200 is powered up. After the EF200 is powered up, the automatic gain control s tatus may change if commands are sent to turn it off. Also, this switc h may be disabled, dep ending on the settings of switch 5 (see below). The default set ting fo r thi s sw itch is of f.

This switch con trols whether noise suppression is applied to the telephone input signal when the EF200 is powered up. After the EF200 is powered up, the noise su ppression statu s may cha nge if commands ar e sent to tu rn it on or off. This swit ch may be disabled, dependi ng on t he setti ngs of s wit ch 5 (see be low). The de fault s etti ng for this switch is off.

Switch 5: Override EPROM

Switches 6-10: Device ID

When this switch is off, the non-volatile memory settings for automatic gain control and noise suppression take precedence over the DIP switch settings. When it is on, the DIP switch settings take prece denc e over the software settings. In other words, if the Override EPROM switc h is off, the settings of switc hes 3 and 4 have no effect. See the section about non-volatile memory configuration for more information about internal aut omatic ga in contro l and noise suppre ssion s etti ngs. The default sett ing for this switch is off.

These switches set the Device ID number for the EF200. The ID can be any number from 0 to 31. It is a five bit binary number , with the least significant bit on switch 10. Table 1 lists the DIP switch positions neces sary to set each Device I D number from 0 to 31.

The Device ID is the same ID that is used with the EF200 Command Set. The EF200 will respond onl y to comma nds that are sent with the same Devic e ID as the one set on its switches. If you set the Device ID to one that doesn’t agree with your remote control commands, the remote control will no longer affec t that particular EF200.

If you are not us ing a remote cont rol de vice ( via RS-232 or the ASPI B us), t he Devic e ID settings do no t matter. The default Devi ce ID is 0.

ASPI Digital -

The Sound of DSP

EF200 U

Table 1: DIP Switch Posit ions for EF200 Device IDs (Blank spaces mean switch is off)

SER MANUAL

Device ID Switch 6

(Device ID 4) 0 (default) 1 ON 2ON 3ONON 4ON 5ONON 6ONON 7 ONONON 8ON 9ON ON 10 ON ON 11 ON ON ON 12 ON ON 13 ON ON ON 14 ON ON ON 15 ON ON ON ON 16 ON 17 ON ON 18 ON ON 19 ON ON ON 20 ON ON 21 ON ON ON 22 ON ON ON 23 ON ON ON ON 24 ON ON 25 ON ON ON 26 ON ON ON 27 ON ON ON ON 28 ON ON ON 29 ON ON ON ON 30 ON ON ON ON 31 ON ON ON ON ON

Switch 7 (Device ID 3)

Switch 8 (Device ID 2)

Switch 9 (Device ID 1)

Switch 10 (Device ID 0)

NSTALLATION

ONNECTING THE

Telephone and Audio Connections

)

VERRIDE

UPPRESSION

ID 4

ID 3

ID 2

ID 1

PROM

EVICE

ID 0

EVICE

OISE

ESERVED

AGC

EF200 TO O

THER EQUIPMENT

The connections des cribed below are also shown in Figure 2.

The EF200 will typically be connected to other equipment as shown below.

microphone

POWER LOW HIGH VOLUMEMIC

POWERED SPEAKER

REMOTE CONTROL

RS-232

LOGIC IN/OUT

ASPI BUS

OUT

TO PHONE

TO LINE

6 9 #

EF400

INTERFACE

MIC I

NPUTSPEAKER OUTPUT

1(875,.

OOM

FROM

AECTOAEC

NPUT

UTPUT

EMOTE

FROM

REMOTETOREMOTE

LAYRECORD

APE

UTE

OOM

NPUT

+5,+/-15

VDC

5, 15 VDC

ON/O

Figure 2. Typical EF200 Connections

• Connect the T

• Connect the EF200’s T

• Connect the T

• Connect the F

• Connect the T

• Connect the F

• If RS-232 remote co ntrol is desired, con nect the RS-232 R

• Connect the external power supply to the P

ASPI Digital -

The Sound of DSP

PSTN

O PHONE

CODEC/hybrid

jack of the E F 200 to an analog telephone hands et using a

TX RX

standard telephone cable.

O LINE

jack to the telephone line in your wall, us ing a

standard (RJ11) modular telephone cable.

AEC jack to the input of the local room audio system. This may

be the input to an AEC, such as the R

ROM

AEC jack to the outpu t of the local room audio system. This

EMOTE INPUT

may be the output of an AEC, like the EF400’s R

O REMOTE

jack of the EF200 to the input of a vi deo CODEC or

of the EF400.

EMOTE OUTPUT

other four-wire transmission interface.

ROM REMOTE

jack of the EF 200 to th e ou tput of a vi deo CODEC or

other four-wire transmission interface.

EMOTE CONTROL

port of the EF200 to a remote control device, such as an RS-232 inte rface to a touch panel or a COM port on a personal computer.

OWER SUPPLY INPUT

jack of the

EF200.

EF200 U

SER MANUAL

Note

Caution!

ONFIGURING THE NON-VOLATILE MEMORY

Note

In order to add a phone call to a c onnection, either (or both) the AEC or R nectors of the EF200 must be connected to other equipment.

To dial a number, the EF200 needs either the RS-232 port or the analog telephone handset to be connected. Only one of these is nec es sary to make calls. Calls can be received using only the front panel buttons. The RS-232 port may be needed to configure power-on defaults in the non-volatile memory during the installation process.

The TO L connectors will still fit snugly.

Do not connect the telephone handset or telephone line to the ASPI Bus.

The EF200 has a non-volatile memory which can store use r cus tom izeable default settings for the EF200’s features. When the EF200 i s power ed on, it will read the non-volatile memory and initialize to the se settings. Once the unit is running, the settings may be changed by commands or logic port switches. These changes won’t affect the non-volatile memory unless they are saved using the SAVENV command.

The EF200 must be turned on and connected to the RS-232 remote control device in order to configure the non-volatile memory.

If the O noise suppression settings in the non -volatile memory will have no ef fect. In that case, the EF200 will in itialize to the automatic gain control and noise suppression settings on the DIP swit che s.

INE

and TO P

VERRIDE EPROM

HONE

EMOTE

con-

jacks are wider than RJ11 telephone jacks, but the RJ11

switch is turned on, changing the automatic gain cont rol and

NSTALLATION

Making Changes

Set each of the parameters to the desired value s by sending RS-232 commands to the unit. Table 2 list s the parameters that are stored in the non-volatil e memo ry, and the RS-232 commands that configure them.

Table 2: Non-volatile Memory Parameters

Command EF200 Initialization Parameter Default

AA Auto answer ena ble/disabl e 0 (off) ACKMOD Acknowledgment mode enable/disable 1 (on) AGC Automatic gain control enable/disable 1 (on) AH Auto hangup mode enable/disable 0 (off) CALLP Call progress enable/disable 0 (off) CID Call er ID en able/d i sable 0 (off) DTMF DTMF decoding enable/disable 0 (off) DTMFC Enable/disable DTMF clamping 0 (off) ERROR Error reporting enable/disable 1 (on) GAINA From phone gain 3 (dB) GAINP To phone gain 0 (dB) LEC Enable/disable line echo canceller 1 (on) LOCKFP Lock/unlock front panel buttons 0 (off) NS Noise suppression enable/disable 1 (on) NSL Noise suppression level 10 (dB) RING Enable/d isable ring messages 0 (off) TONEE Enable/dis able entry and exit tones 1 (on) TONER Enable/disable ring tones 1 (on)

Saving Changes

ASPI Digital -

The Sound of DSP

Note

Once the desired parameters have been set on the EF200, s ave them to the non-volatile me mory by s en d ing the SAVENV command. The EF200 will be initialized with these settings every time the uni t is powered on. You can save to the non-volatile memory up to 10,000 times.

Saving th e parameters takes a few seconds, and should not be done during a conversation. Saving parame ters duri ng a conve rsation may ca use gaps in the audio, while the EF200 writes to the non-volatile memory.

EF200 U

SER MANUAL

ALIBRATING THE

Calibrating the AEC

Warning!

Calibrating the

ROM REMOTE

Signal

EF200 A

The EF200 is designed to interface with a wide range of signal l evels, so that it ca n be compatible with most equipment. The expected levels for input and output should be set on the EF200 to matc h the levels of the equipm ent to which it is connected. The following procedure should be followed to match these levels.

If you are connecting an ASPI Digital EF400 Acoustic Echo Canceller to the AEC jacks of the EF200, the calibration proce ss is quite easy. Open the EF400, and turn the remote output pot ( R25) fully counter-clockwise to -20 dBu. Turn the remote input pot (R24) fully clockwise to -20 dBu. The EF200 is desi gned to work with the EF400 when it is set to these levels.

If other equip me nt is connected to the F capable of interfacing with -20 dBu signals.

The pots on the EF400 are sin gle turn pots only. Do not try to turn them to o f ar.

The F locate d just to the left of the T is from -20 dBu (nominal) to +4 dBu (nominal). To calibrate th is input, you need to have someone on the remote end talk so that you can verify their speech level on the

O PHONE LEVEL INDICATOR

1. Turn on the EF200, as well as the ro om audio sys tem (inc ludi ng the AEC) so th at

2. Have the person on t he remote end sp eak in a nor mal voice whi le the re is no loca l

3. Adjust the F

UDIO SIGNAL LEVELS

ROM

AEC and TO AEC jacks, it shoul d be

ROM REMOTE

you can he ar the speech o n the remote end.

audio input through the AEC.

remote end frequently illuminate the first ye llow LED on the T

NDICATOR

I pot clockwise will increase the level, and turning it counterclockwise will decrease the level. This is a five-turn trimpot.

signal level is adjusted using the F

O PHONE LEVEL INDICATOR

ROM REMOTE GAIN TRIMPOT

, and occasiona lly flicker the second yellow LED. Turning the tr im-

until normal speech levels from the

ROM REMOTE GAIN TRIMPOT

. The range of adjustment

O PHONE LEVEL

Calibrating the TO

EMOTE

Signal

Note

Verifying Calibration

The TO R

O REMOTE

T eral this wou ld be abou t the same as th e nomin al input lev el. The ran ge of a djust ment is from -20 dBu (nomina l) to +4 dBu (nomi nal). Adjust t his t rimpot unti l the C ODEC or other 4-wire equipment is receiving the co rrec t level. This is also a five-turn trimpot.

The F the leve l going to the T

EMOTE GAIN TRIMPOT

Give the EF200 a test run, us ing both the AEC and remote connecti ons, if possible. During normal conversation, the T

EVEL INDICATOR

L occasionall y flicker the second. Level s that are much too high or too low may pre-

EMOTE GAIN TRIMPOT

signal is appropria te for the equipment to which it is c onnected. In gen-

ROM PHONE LEVEL INDICATOR

O REMOTE

, the level shown on the meter will not change.

should show levels that regularly hit the first yellow LED, and

should be calibrated so that the outpu t level of the

shows the level received from the telephone, not

jack. When you change the gain on the TO

O PHONE LEVEL INDICATOR

and F

ROM PHONE

NSTALLATION

vent the EF200 or othe r equipment from performing as desi gned, and audio quality may suffer.

When connected to an EF400, the EF200’s T

O PHONE LEVEL INDICATOR

should show the same level as the EF400’s remote level indic ator: correct setting of this level is vi ta l to the corre c t o perati on of th e EF400 .

ONNECTING MULTIPLE

EF200

Multiple EF200s can be easily connect ed together to allow multiple callers to be brought into the system. When the audio signa ls are connected acc ording to the following directions, the EF200 takes care of the necessary mixing functionality. The ASPI Bus allows mult iple devices to be controlled by a single RS-232 connection.

microphone

POWER LOW HIGHVOLUME MIC

POWERED SPEAKER

NPUT

MIC I

NPUTSPEAKER OUTPUT

1(875,.

OOM

VERRIDE

PROM

REMOTE CONTROL

ID 4

ID 3

EVICE

RS-232

ID 2

ID 1

ID 0

EVICE

LOGIC IN/OUT

)

UPPRESSION

OISE

ESERVED

AGC

ASPI BUS

OUT

TO PHONE

TO LINE

EF400

INTERFACE

PSTN

VERRIDE

PROM

REMOTE CONTROL

ID 4

ID 3

EVICE

RS-232

ID 2

ID 1

ID 0

EVICE

LOGIC IN/OUT

)

UPPRESSION

OISE

ESERVED

AGC

ASPI BUS

OUT

TO PHONE

TO LINE

EF400

INTERFACE

FROM

AECTOAEC

FROM

AECTOAEC

UTPUT

EMOTETAPE

FROM

REMOTETOREMOTE

FROM

REMOTETOREMOTE

LAYRECORD

+5,+/-15

ON/O

VDC

UTE

OOM

NPUT

5, 15 VDC

Connecting the AEC and CODEC

ASPI Digital -

The Sound of DSP

PSTN

ASPI BUS

OUT

TO PHONE

TO LINE

PSTN

EF400

INTERFACE

FROM

AECTOAEC

FROM

REMOTETOREMOTE

CODEC/hybrid

5, 15 VDC

TX RX

VERRIDE

PROM

REMOTE CONTROL

ID 4

ID 3

EVICE

RS-232

ID 2

ID 1

ID 0

EVICE

LOGIC IN/OUT

)

UPPRESSION

OISE

ESERVED

AGC

Figure 3. Connec ting multiple EF200s.

The AEC should be connected to the first EF200 according to the guidelines above. The CODEC should be connected to the last E F200. The connections a r e the same a s for a single EF200.

EF200 U

SER MANUAL

Connecting the Audio Between EF200s

Connecting the ASPI Bus

Connect the TO R EF200.

Connect the F EF200.

Connect the R in the same way. Repeat this process until you ge t to the last EF200.

Calibrate each EF200 by turning the F and the T so you will have to tur n them a few times. The trimpots on the last EF200 (the one connected to t he C ODEC) sho uld be c alibra ted a ccordin g to the dire ctio ns for a singl e EF200.

The ASPI Bus can co nnect multiple ASPI Digital product s, such as the EF200, to the same RS-232 remote cont rol device. This means only one RS-232 connection is needed to control all devices on the ASP I Bus. Each device on the ASPI Bus should have a different Device ID or Type ID, so that each de vice can be addressed and controlled individually. These step s should be followed to connect the ASPI Bus:

1. Connect the RS-232 remot e cont rol d evi ce to the fir st ASPI Digi ta l pr oduct i n th e

2. Connect an ASPI Bus terminator to the ASPI B

3. Connect an ASPI Bus cable between the ASPI B

4. Connect the ASPI B

5. Connect an ASPI Bus terminator to the ASPI B

O REMOTE GAIN TRIMPOT

chain.

the ASPI B

device, and so on.

chain.

EMOTE

jack of the first EF200 to the F

ROM REMOTE

EMOTE

US IN

jack of the first EF200 to t he TO AEC jack of the second

jacks of the secon d EF200 to the AEC jacks of the third EF200

ROM REMOTE GAIN TRIMPOT

fully counte rclockwise. These are five-turn pots,

of the second device.

US OUT

of the second device to the ASPI BUS IN of the thi r d

ROM

AEC jack of the second

US IN

of the first device.

US OUT

of the first device, and

US OUT

of the last device in the

fully clockwise,

Caution!

Note

OUNTING THE

EF200

Tabletop Installation

Rackmoun t Installation

Don’t connect the phone to the ASPI Bus.

Front panel but tons and L ASPI Bus. Only the local device is affected by its front panel interface.

The EF200 can be mounted i n a rack enc losu re, us ing the RS 200 Rack Shelf avail abl e from ASPI Digital. This shelf allows you to mount one or two EchoFree half-rack devices (such as the EF200 and EF400) in a single rack space. Alternatively, the EF200 can be instal led on a tabletop.

The EF200 is equipped with four rubber feet that allow installation on a flat surface such as a tabletop.

1. Remove the adhesive backing on the rubber feet.

2. Install the r ubber feet in the circular cutouts on the EF200 baseplate.

The RS200 Rack Shelf, designed to rack mount ASPI Digital products, is sold separately from the EF200.

1. Place the EF200 on the ASPI Digital RS200 Rack Shelf.

OGIC IN/OUT

controls do not affect other devices on the

NSTALLATION

2. Secure the EF200 to the RS 200 shelf using four of the small scr ews (4-40 x 1/2”)

provided with the RS200. If one EF200 is to be mounted on the shelf, place it in the center. If two units are to be mounted, mount them side by side .

3. If only one EF200 is moun ted, attach the two small faceplates supp lied with the

RS200 to each side of the EF200. Use four more of the small screws to secure the face plates.

4. Secure the RS200 shelf to the rac k using all four large screws (10-32 x 1/2”) sup-

plied with the RS200.

5. The EF200 power supply block should be placed securely in the base of the rack

unit. To eliminate any risk of the power cable being pulle d out of the EF200 rea r panel connector, use the plastic Ty-Wraps prov ided with the RS200 to provide strain relief by securing the power cable to the rack upright at the rear of the EF200.

Caution!

SING THE LOGIC IN/OUT PORT

Failure to use all four screws to attach the RS200 s helf to the rack may result in uneven lo ading and cause a safety hazard .

Ensure that the power supply is securel y loc ated suc h that it cannot be come dis lodged and fall. Such a fall could cause pers onal injury or equipment failure.

When mounting an EF200 in a rack, consideration should be given to airflow and operating ambient temperatures inside the rack. To ensure safe operation of the EF200, ambient operating temperatures inside the rack should not exceed 50 degrees Celsius. Allow 2 inc hes of open space in front of the EF200, and f our inches behind the unit for prop er ve ntila tion. Equipm ent should not be inst alle d in t he rack in s uch a way as to interfere with the ventilation of the EF200.

Consideration should be given to the connection of the equipme nt to the supply circuit and the effect that overloading of circuits could have on overcurrent protection and supply wiring . Appropriat e conside rat ion of equip ment na meplate ratings should be used when addressing this concern.

Reliable earthing of rack-mounted equipment should be mainta ined. Particular attention should be given to supply connections other than direct connection to the Branch (use of power strips).

ASPI Digital -

The L using contact closur es (switc hes) . It als o has sev eral out put pins which can be used to drive LED status indicators. The switches should be closed to enable a feature, and opened to d isable it. When an LED is turned on, it mea n s the featu re is enabled . A

The Sound of DSP

OGIC IN/OUT PORT

allows remote control of many of the EF200’s fea tures

EF200 U

SER MANUAL

list of the pins on the L

OGIC IN/OUT PORT

and the features they control is shown

below. The ground pin (15) should be used with all contact closures and LEDs.

Table 3: L

OGIC IN/OUT PORT

Pin Descriptions

Pin In/Out Function 1 Input AGC enable/disable 2 Input Noise Suppression enable/disable 3 Input Auto answer enable/disable 4 Input Reserved 5 Input Phone connect/disconnect 6 Input Remote connect/disconnect 7 Input Privacy on/off 8 Input Reserved (do not connect) 9 Output Res erved (do not connect) 10 Output Phone connect status 11 Output Privacy status 12 Output Remote connect status 13 Input Reserved (do not connect) 14 Input Reserved (do not connect) 15 Ground

Note

OGIC IN/OUT PORT

The L

should not be used at the same time as the RS-232 remote control or front pane l buttons. If you change the status of a command using RS-232 or the front panel, the L

OGIC IN/OUT PORT

switch will not change position. This means the switc hes will not reflect the act ual status of the EF200, which is confusing to the user. While the RS-232 P

ORT

OGIC IN/OUT PORT

and L

can be used at the same

time, we don’t recommend it due to this potential confusion. The figure below shows what type of circuit should be used with the Logic In/Out

Port. Any switch can be used for the inputs. The outputs are 5V TTL outputs, with a built-in 220 Ohm resistor. The se can be used to drive most LEDs. Of course, we recommend using a blue LED for the privacy status.

1 2 3 11 12

Figure 4. L

OGIC IN/OUT PORT

circuit.

PERATING THE

EF200

PERATING THE

SING THE

EF200 W

Making a Call

Receiving a Call

EF200

ITHOUT

In order to use the EF200 without a remote control device, you need access to the front panel buttons. You also need a regul ar analog telephone handset, which should be connected to the T

Follow these ste ps to make a call using the EF200 front pane l and a handset:

1. The EF200 shou ld initially b e on hook (the P

2. Pick up the handset, and wait for a dial tone.

3. Dial the phone number, and navigate th rough any touch tone menus, if necessary.

4. Push the P

5. Hang up the handset.

6. The conversat ion may now begin.

When someone is calling the telephone line to which the EF200 is connected , the analog handset conne cted t o the T the T P C

RS-232 C

lit).

HONE

NECT

light should turn on.

AEC and TO R

HONE

button to answer the call and give the EF200 control of the line. The P

ONNECT

light should turn on. The conversation may begin immediately.

ONTROL

O PHONE

button to give the EF200 control of the line. The P

EMOTE

jack.

HONE CONNECT

O PHONE

connector whi ch may be heard b y bot h parti es. Push th e

jack will ring. A ring tone will a lso be se nt to

LED should not be

HONE CON

HONE

Ending a Call

Muting the EF200

Warning!

SING THE

EF200

When the call is over, you can end the call by pushi ng the P panel. The P hook, be sure to ha ng up the analog handset connected to the T

You can mute the EF200 by pushing t he P

VACY ON

When th e P put or the remote side.

The P

ECORD

R recorded on a device conne cted to the EF400, use the M EF400 rear panel.

WITH

RS-232 C

You can control all of the EF200’s features with an RS-232 remote control device. All of the dialing functions can be controlle d through the RS-232 port. You can also use the front panel or an analog handset to make calls, as des cribed in the previous section, even if you have an RS-232 remote control device connec ted to the system. The instructions below explain which RS-232 commands are needed to accomplish each function. Users may not need to know these commands, since they may be hidden behind the user interface of the remote control device.

HONE CONNECT

light will turn on. You can unmute the EF200 by pushi ng the butt on again.

RIVACY ON

RIVACY

button on the EF200 front panel does not mute the audio going to the

output on the EF400. If you want to prevent local speech from being

ONTROL

light should turn off. Also, if the analog phone is off

light is on, the F

RIVACY

ROM

button on the front panel. The PRI-

AEC signal is not sent to the phone out-

HONE

button on the front

O PHONE

UTE

contact closure on the

jack.

ASPI Digital -

The Sound of DSP

EF200 U

SER MANUAL

Making a Call

Receiving a Call

Follow these steps to make a call using the EF200 command set:

1. The EF200 should initially be on hook (the P

HONE CONNECT

light should not be

lit).

2. Take the EF200 off hook by sending the PHONE1 command (the P

NECT

light will turn on), and wait for a dial tone. Dial tone will be audib le on the

HONE CON

local and remote ends.

3. Dial the number using the DIAL command.

4. The conversat ion may begin as soon as the other party picks up the line.

These events occur when a call is received by the EF200:

1. When the phone rings, the R ING! message will be sent to the remote control

device (if the message s a r e enabled). Also, ring tones may be sent to the T AEC output to provide an audible indica tion that the line is ringing.

2. If caller ID is enabled, caller ID info r mation will be sent to the remote control

device between the first and second rings.

3. If auto answer is enabled, the EF200 will answer the phone after the second ring.

4. If auto answer is not enabled, you can answer the line by sending the PHONE1

command at any time.

5. An entry tone will be played when the call is answered, if entry tones are

enabled.

Ending a Call

Muting the EF200

To end the call, send the PHONE0 command to th e EF200. This will cause the EF200 to hang up.

The EF200 can be muted in various ways using the RS-232 command set.

Command Description Effects

ROM

PRIVACY Mute All Nobody hears the F

AEC signal.

MUTEP Mute Phone The people on the phone don’t hear anyone. MUTER Mute Remote The people on the re mote end don’t hear anyone. HOLD Phone on Hold Telephone audio is muted in both directions.

If you send more tha n one mu te command t o the EF200, yo u have to turn e ach one off individually. For instance, if you turn on MUTEP and PRIVACY, and then turn off PRIVACY, the people on the phone won’t hear anyone until you turn off MUTEP as well.

RIVACY ON

The P mand is s e nt, or the P

VACY ON

light is lit, nobody can hear you.

light on the front panel will only light up when the PRIVACY com-

RIVACY

button on the front panel is pushed. Any time the PRI-

Warning!

Privacy mode does not mut e audi o going to the R

ECORD

output of the EF400. If you

want to prevent local speech from being recorded on a device connected to the

UTE

EF400, use the M

contact closure on the EF400 rear panel.

ROUBLESHOOTING

ESIDUAL ECHO

If there is residu al echo in the system, it may not be a problem with t he EF200. The re are different types of ec hoes that come from different directions, and the EF200 is only designed to rem ove one of them. The first step is to make sure the echo isn’t caused by something else. Then, the EF200 can be adjusted to remove any residual echo coming from the hybrid.

Identifying the Echo Source

Removing the Echo

If both the AEC and Remote connections are used, troubleshoot the system without the EF200’s phone conne cted at first. This will make sure the 4-wire AECs on both ends are working pro perly. If one side hears echo, there is a problem with the AEC on the other s ide. Troubleshoot the AEC according to the instructio ns for that device.

Make a call to test the EF200’s telephone interface. If the party on the phone hea rs echo, it is coming from the local or remote end. Disconnect one end at a time (by briefly unplugging the speaker or micro phone) and see when the echo goes away. Troubleshoot the AEC on the side (local or remote) that was causing the echo.

If residual echo is heard on the local end, try dis connecting the remote end. If the echo is still there, it is com ing from the EF200. Troubl es hoot the EF200 as described in the next secti on. If the echo goes away when the remote end is dis connected, troubleshoot the AEC on the rem ote end.

If residual echo is heard on the remote end, disconnect the microphone(s) in the local room. If t he echo is still ther e, it is coming from the EF200. Troubleshoot the EF200 as described below. If the echo go es away when the microphone is disconnected, the echo is coming from the local room. Troublesh oot the local AEC.

If the EF200 is no t removing hybrid echo, it may be due to a mismatch of levels coming into the EF200. If lev els are too far off, it may be diffic ult for the EF200 to determine when to adapt its filter. Make sure the levels are in the cor r ect range by watching the front pan el LED meters during norm al co nversa tion. The sign als shou ld regularly be hit ting the first yello w light, and occasionally flicker the second yell ow light. Adjust the inc oming signal levels if necessary. Also, make sure the LEC feature is enabled .

CAN’T R

ECEIVE CALLS OR DIAL OUT

Test with an Analog Phone

ASPI Digital -

The Sound of DSP

If you can’t receive calls or dial out, it is most likely because the telephone line is from a digital PBX system, or the remote control system is not properly co nnec ted.

Try connecting a re gular an alog te lep hone to the EF200’s l ine, and make a call. If the telephone will not work on that line, it is probably a digital PBX line from an office system. The EF200 needs a standard analog line. You will need to get an analog phone line installed for the EF200.

EF200 U

SER MANUAL

Try Dialing Manually

Fix the Remote Control

CAN’T GET C

ALLER

If the analog telep hone works on the li ne, try using it wit h the EF200 to dial manually.

O LINE

Connect the T the handset to the T Without RS-232 Control” on page 17.

If you can make calls by dialing with the anal og handset, but not with the remote control device, that means there is a problem with the remote control. See the “Remote Control Problems” section below.

NFORMATION

ID I

You can test caller ID inform ation on your line by connec ting a caller ID box to the line. If the box detects caller ID information, make sure the EF200 has caller ID enabled (see the CID command).

If you can’t get caller ID information, it’s probably because caller ID is not available on that telephone line. Contact your local telephone company to add this service to the line.

Some digita l PBX syste ms sen d call er ID inform ation to di gital phon es on t he syst em, but not to analog lines controlled by the office switchboard. Even if your off ice phones get caller ID information, that doesn’t nece ssarily mean that informat ion is passed on to anal og lines as well.

jack of the EF200 to the telephone jack in the wall, and connect

O PHONE

jack. Try mak ing a ca ll , as out lin ed i n “Usi ng th e EF200

EMOTE CONTROL PROBLEMS

If the remote control device doesn’t seem to be affecting the EF200, there are a few things you can ch eck. Try sending commands that have a visible impact, like the PRIVACY command (which turns on the front panel P for messages from the EF200, like acknowledgement or error m essages, if the remote control device can display them.

Check Command Syntax

Check Device ID

Check RS-232

Make sure the commands that are b eing sent to the EF200 have the correc t syntax. If only a couple of the commands aren’t being processed, there may be an error in the syntax of t hose c ommands . Re member, the c omman ds are case sens itive . The EF 200 should return ERROR# messages if the commands are typed incorre ctly, as long as error message s are enabled.

Make sure the Device ID of the EF200 matches the Device ID of the commands that are being sent. If they don’t match, the EF200 will ignor e all the commands. Try sending a command to all devices (*** instead of Devic e T ype and Device ID). If this works but se nding commands to a specific device doesn’t , the Device ID doesn’t match.

Make sure the RS-232 cabl e is connected securely to the EF200 and the remote control device . Also, the RS-232 port on the remote co ntro l devic e should be s et to 960 0, 8-N-1.

RIVACY ON

light). Also, look

+ 50 hidden pages