RTS TIF951, CS9500, CS9600, CS9700 User Manual

USER

MANUAL

Dual Telephone Interface

for the

CS9500, CS9600,

and

CS9700

Intercom Systems

TSTM

9350-71

54-000

Rev

B

1

/98

TIF951 Operation Guide RTS

Systems

Division

TABLE

OF

CONTENTS

General Description

..............................................................................................................

1

Installation

..............................................................................................................................

1

Connecting to the intercom.

.....................................................................................

1

DIP Switch Settings

...................................................................................................

1

Rear Panel. Switch

#l.

Auto

answer.

Ring,

asw word,

A&-.

bud

..........................

1

Internal Switch

#3.

passw~rd

&ct.

password

length

...............................................

3

Operation

................................................................................................................................

5

From a keypanel

........................................................................................................

5

Pro dn keys

.........................................................................................

5

Di&g a calf

..................................................................................................

6

Re-dialing

.......................................................................................................

7

Speed Dial

......................................................................................................

7

Answering a Call

...........................................................................................

8

Programming for use from a phone

........................................................................

7

Auto

Answer

..................................................................................................

8

Manual answer

...............................................................................................

9

Internal. Switch

#2.

Ring

count

........................................................................

2

Hanging up

.....................................................................................................

6

Using from a phone

...................................................................................................

9

DTMF codes. preassigned keys

.............................................................................

10

Programming

keys

from

the

phone

.......................................................................

11

9350-7154-000 . Rev

B

Page

.

i

Telex Communications. Inc

.

I

.
.

.

TIF951

Operation Guide RTS Systems

Division

End-User License Agreement for Telex@ Software

IMPORTANT

-

Please

read

this document carefully before using this

product
THIS DOCUMENT STATES

THE

TERMS

AND CONDITIONS UPON
WHICH TELEX COMMUNICATIONS, INC. (the “COMPANY”) OFFERS
TO LICENSE THE INSTALLED SOFTWARE OR PROGRAM (the
“SOFTWARE”) FOR USE WITH THE PRODUCT

IN

WHICH IT WAS

INSTALLED. YOU

ARE

AGREEING TO BECOME BOUND BY

THE

TERMS OF THIS AGREEMENT. IF YOU

DO

NOT AGREE TO THE

TERMS OF

THIS

AGREEMENT,

DO

NOT USE

THIS

PRODUCT.

PROMPTLY RETURN

THE

PRODUCT TO

THE

PLACE WHERE YOU

OBTAINED IT FOR A FULL REFUND.
The

installed

software

as

supplied by

the

Company

is

licensed, not sold, to you

for use only under the terms

of

this license, and the Company reserves all

rights

not

expressly granted

to

you. You own the product or other media on or in which

the Software is originally

or

subsequently recorded or fured, but the Company

retains

ownership

of

all

copies of

the

Software itself.

1.

License: This license allows you to use the Software for internal purposes

only

on

a single

product

in which it

was

installed.

2.

Restrictions: (a) You may not market, distribute or transfer copies

of

the

Software

to

others or electronically transfer or duplicate the Software. YOU

MAY

NOT

REVERSE ENGINEER, DECOMPILE, DISASSEMBLE,

MODIFY,

ADAPT,

TRANSLATE, RENT, LEASE OR LOAN

THE

SOFTWARE OR CREATE DERIVATIVE WORKS BASED

ON

THE

SOFTWARE OR

ANY

ACCOMPANYING

WRITTEN

MATERIALS.

(b)

The Software and the accompanying

written

materials

are

copyrighted.

Unauthorized copying

of

the Software, including portions thereof

or

the

written

materials, is expressly forbidden. (c) You undmtand that the Company may
update

or

revise the Software

and

in

so

doing incurs no obligation

to

furnish

such updates

to

you.

3.

Limited Warranty:

The

Company does

not

warrant that the operation

of

the

DISCLAIMS ALL

OTHER

WARRANTIES

AND

CONDITIONS EITHER

Software

will

meet your requirements or

operate

free

from error. The Company

EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF
MERCHANTABILITY,

FITNESS

FOR

A PARTICULAR PURPOSE

AND

NON-INFRINGEMENT OF

THIRD

PARTY RIGHTS.

4.

Limited Liability: The liability of the Company for any claims arising out of

this License based

upon

the Software, regardless of the form

of

action,

shall not

exceed the greater

of

the license fee for the Software or

$50.

38109-709RevA 10197

Page

-

ll

Telex

Communications,

InC.

TIF951

Operation Guide

RTS Systems Division

End-User License Agreement

for

Tele9 Software

IMPORTANT

-

Please read

this

document carefully before

using

this

product.

THIS

DOCUMENT STATES

THE

TERMS AND CONDITIONS UPON

WHICH

TELEX COMMUNICATIONS, INC. (the “COMPANY”) OFFERS

TO LICENSE

THE

INSTALLED SOFTWARE OR PROGRAM (the

“SOFTWARE”) FOR USE WITH THE PRODUCT

IN

WHICH IT WAS
INSTALLED. YOU ARE AGREEING TO BECOME BOUND BY THE
TERMS OF THIS AGREEMENT. IF YOU DO NOT AGREE

TO

THE

TERMS OF THIS AGREEMENT,

DO

NOT USE

THIS

PRODUCT.

PROMPTLY RETURN

THE

PRODUCT TO THE PLACE WHERE YOU

OBTAINED IT FOR A FULL REFUND.
The installed software

as

supplied by

the

Company

is

licensed, not

sold,

to you
for use only under the terms of this license, and the Company reserves all rights
not expressly

granted

to you.

You

own

the product or other media on or in which

the

Software

is originally or subsequently recorded or fvred, but the Company

retains ownership

of

all copies of the Software itself.

1.

License: This license allows

you

to use the Software for internal purposes

only on

a

single product in which it was installed.

2.

Restrictions: (a) You may not market, distribute or transfer copies

of

the
Software to others or electronically transfer or duplicate the Software. YOU
MAY NOT REVERSE ENGINEER, DECOMPILE, DISASSEMBLE,
MODIFY,

ADAPT,

TRANSLATE,

RENT,

LEASE OR LOAN

THE

SOFTWARE

OR CREATE DERIVATIVE WORKS BASED ON

THE

SOFTWARE OR

ANY

ACCOMPANYING

WRITTEN

MATERIALS. (b)

The

Software

and the accompanying

written

materials

are

copyrighted.

Unauthorized copying of the

Software,

including portions thereof or the written

materials, is expressly forbidden.

(c)

You understand that the Company may

update or revise the

Software

and

in

so

doing

incurs

no obligation

to

fimish

such updates

to

you.

3.

Limited Warranty:

The

Company does

not

warrant that the operation of the

DISCLAIMS

ALL

OTHER WARRANTIES

AND

CONDITIONS EITHER

Software will meet your requirements or

operate

free

from error. The Company

EXPRESS OR IMPLIED, INCLUDING

THE

WARRANTIES OF

MERCHANTABILITY,

FITNESS

FOR

A

PARTICULAR PURPOSE

AND

NON-INFRINGEMENT OF

THIRD

PARTY RIGHTS.

4.

Limited Liability: The liability of the Company for any claims arising out of

this License based upon the

Software,

regardless

of

the form of action, shall not

exceed the greater

of

the license fee for the Software or

$50.

381

09-709

Rev

A

10197

Page

-

11

Telex Communications,

InC.

SW

#

1

2

3

4

5

6
7
8

TIF951 Operation Guide

RTS

Systems Division

SECTION 1: GENERAL DESCRIPTION

The

TIF!35

1

connects a pair of telephone dial tone lines to the CS9500/CS96OO/CS9700 series intercom

systems. Each of the two telephone lines occupies an

input/output port in the intercom matrix, and

each channel occupies one key panel data address.
The

TIF951 provides general purpose control and interfacing for telephone lines. Each telephone

interface channel may be used to dial out from any key panel, auto answer incoming calls, or accept
incoming calls to be answered by key panels.

SECTION 2: INSTALLATION

2.0

Connecting the "951 to the intercom.

Each channel of the TIF95 1 connects to the matrix in exactly the same way as an intercom key panel.

If

your system utilizes the XCP954 cross connect panel, you may plug the "IF95 1 directly in

using

a

3

pair cable with DB9 connectors at each end.

If

your intercom uses the XCP955

cross

connect panel, you may use the DB9 to

RJll

adapters which

are supplied in the accessory

kit packaged with the

TIF95

1.

In

the event you need to make your

own

adapter, the wiring is as follows (these adapters are readily available from companies which sell
computer wiring accessories):

RJll

DB9

1

(blue)

2

Data

-

2

(yellow)

8

TIF

input

+

4 (red)

5

TIF

output

-

5

(black)

7

TIF

input

-

6 (white)

1 Data

+

3

(green 4

TIF

output

+

RJ

11

SOCKET

(FEMALE)

*

Note, twist the wires, white with blue, black

with

yellow, red with green

2.1 DIP Switch Settings

The rear panel DIP switch contains switches to configure the most often changed options. These
include auto answer mode, ring

signal mode, password mode, intercom port address (key panel

number), and baud rate.

2.1.1

Rear

panel DIP Switch #1:

DIP switch 1 (rear panel) settings:

Auto Answer
Generate Ring Signal

Password Required

Address

Address
Address
Address
Baud Rate

9350-7154-000 - Rev

B

On (down)

Yes
Yes
Yes

1's

2's

4's

8's

76800

Page - 1

Off

(UP)

no
no
no

9600

Telex

Communications, Inc.

TIF951 Operation Guide

RTS Systems Division

DIP switch

1,

address

settings:

Address Settings: Rear DIP Switch, Switch # (down is on, up is

off)

Port Number

1,

11,21,

etc

2, 12,22,

etc

3, 13,23,

etc

4, 14,24,

etc

5,15,25,

etc

6,

16,26,

etc

7, 17,27,

etc

8,

18,28,

etc

9, 19,29,

etc

10,20,30,

etc

4

on

Off

on

Off

on

Off

on
off

on

Off

5

6 7

Off

on
on

Off

Off

on

on

Off

Off

on

Off

Off

Off

on
on
on
on

Off

Off

Off

off
off

Off
Off

Off

Off

Off

on
on
on

AUTO

ANSWER

mode will set the unit to answer the phone automatically when it rings. The number

of rings required before it answers is set on internal DIP switch

#2.

If

set for manual answer, the line

will

ring until someone at a key panel answers the call.

GENERATE

RING

SIGNAL

sets the unit

so

that when the phone line is ringing, certain designated

key panels or circuits will receive an audible ring signal.

PASSWORD REQUIRED

sets the unit

so

that when a call is automatically answered, it will require
that the user enter a password via DTMF before the unit will allow communications. The actual
password is set using internal DIP switch

#3.

PORT ADDRESS

tells the unit and the intercom which matrix inputs and outputs belong to the

TIF.

The settings are the same

as

for a key panel. The setting is the binary representation of the last digit

of the matrix

input/output number which that channel

of

the

TIF

is connected. See the address table

above for the actual settings.

BAUD

RATE

sets the data rate with which the

TIF951

communicates with the intercom. The data

rate for all

CS9500

intercom matrices is

9600

BPS

(switch

off).

The

data

rate for all

CS9600

and

CS9700

matrices is

76.8K BPS

(switch on).

2.1.2

Internal DIP switch

a:

DIP switch

#2,

which is located internally to the unit sets the number of rings before the unit auto

answers. Please note that the ring count is approximate.

This

switch has no effect unless the rear panel

DIP

switch is set for auto answer mode.

If

the ring count is set for a high number

(8),

and auto answer
is enabled, the unit may be used for mixed mode operation, where key panel operators normally answer
the incoming call, but the line will auto answer in the event they are away from their panels.

9350-7154-000 - Rev

B

Page - 2

Telex Communications, Inc.

TIF951 Operation Guide

RTS

Systems Division

DIP Switch

#2

(internal):

1

2

3

4

5

6

7

8

DIP Switch

#2,

Ring Count settings

Rings Internal

DIP

SW2,

Switch # (down is

on,

up

is

off)

‘1

2

1

2

4

8

off

off

on

off
off on
on

on

2.1.3 . Internal DIP switch

#3:

DIP switch

#3,

which is located internally to the unit selects the password. It has

no

effect

unless password required has been enabled

on

DIP switch

#1

(rear

assword required is enabled, the password must be entered

via

DTMF

by t iane1)* e caller before

When

[e

may communicate. This is to prevent unauthorized use

of

the intercom by callers.

Switches

7

and 8 select the length of the password, from 1 digit to 4 digits.

If

set for 1 digit,

only the first digit

of

the password

is

used,

if

set for 2 digits, then the first 2 digits are used

etc.

DIP Switch

#3

(internal):

1

Password select

2

Password select

3

Password select

4

Password select

5

Password

select

I

6

Password select

7

Password length

8

Password length

9350-7154-000 - Rev

6

Page - 3 Telex Communications, Inc.

TIF951 Operation Guide

RTS

Systems Division

DIP Switch

#3,

Password settings

Internal DIP

SW3,

Switch

#

1

Off

on
off

on

off

on

Off

on

Off

on

Off

on

Off

on

Off

on

Off

on

Off

on

Off

on

Off

on

Off

on

off
on
off

on

Off

on

Off

on

Off

on

Off

on

Off

on

Off

on

Off

on

Off

on

Off

on

Off

2

Off

off

on

on

off

Off

on

on

Off

off

on

on

Off

Off

on
on

Off
Off

on

on

Off

Off

on

on

Off

Off

on

on

Off
Off

on

on

Off

off

on

on

Off
Off

on
on

Off

Off

on
on

Off

Off

on

on

Off

3

Off

Off
Off
Off

on

on
on
on

off

Off

Off
Off

on

on

on

on

Off

Off

Off

Off

on
on
on

on

Off

Off

Off
Off

on
on
on

on

Off

Off

Off

Off

on

on

on
on

Off

Off
Off
Off

on

on

on
on

Off

4

Off
Off

Off
Off
Off

off

Off
Off

on

on

on

on

on

on
on

on

Off

Off
Off
Off

Off
Off
Off
Off

on

on

on

on

on
on
on
on

Off

Off

Off

Off

Off
Off
Off

Off

on

on

on

on
on

on

on

on

Off

5

Off

Off
Off
Off
Off
Off
Off
Off
Off

Off
Off

Off
Off

Off

Off

Off

on

on

on

on

on

on
on

on

on

on
on

on
on
on

on

on

Off
Off

Off

Off
Off

Off

Off
Off

Off

Off

Off

Off

Off

Off

Off
Off
Off

6

Off
Off

Off

Off

Off

Off
Off

Off

off

Off

Off
Off

Off
Off

Off
Off
Off
Off

Off

Off

Off

Off
Off
Off

off

Off
Off

Off

off

Off

Off

Off

on

on

on

on

on
on

on

on
on
on

on

on
on

on

on

on
on

9350-7154-000 - Rev

B

Page

-

4

Telex Communications, Inc.

TlF951 Operation Guide

DIP Switch #3. Password settings. continued

RTS Systems Division

1

on
off
on

Off

on

Off

on

Off

on

Off

on

Off

on

Off

on

--,

~~

Internal DIP SW3: Switch

#

2 3

4

off

off off

on

off

off

on

off off

off

on

off

off

on

off

on

on

off
on on off
off

off

on

off

.

off

on
on

off on

on

off

on

off

on

on

off

on on
on on on
on

on on

5

Off

Off

Off

Off
Off

Off

Off
Off

Off

Off
Off

Off

off

Off

off

6

on

on

on

on

on

on

on
on

on

on

on

on

on
on
on

DIP Switch #3, Password Length
Internal DIP SW3 Switch

#

Length

7

8

4
3
2

1

off

off

on

off

off . on

on on

SECTION

3, OPERATION

3.1 OPERATION

FROM A KEY

PANEL

The

TIF951

is operated from the intercom key panels, and from the

dial

pad

on

the

telephone at the remote end of the line. Any key panel with

a

key pad may use

a

TIF951.

All that is necessq

is

to program a

key

to talk to

the

TIF951,

as

if

it were a key panel.

The alpha numeric display or tally LED for that key then provides information about the
phone line.

A

solid display or non illumined LED indicates

a

line

which

is

not

in

use.

A

slow flash indicates a hne which

is

in

use

(off

hook). A rapidl

flashixl~

display

or

LED

indicates a line which

is

M

g.

In

addition, the alpha numeric &play

wd

display digits

as

they are dialed, and the LE

f.?

will

flash

for each digt.

3.1.1 Programming a key

to

use

the

"951.

To

use the

TIF951,

either to answer a call, or to call out, you

first

need to program a key

to

talk to the

TIF951.

This

is

accomplished

in

the same manner

as

pro

ammine

a

ke to talk

to

a

key

anel.

To

program a key by port number, enter

NUM-nnn-

GM-t,

where

hJM

is

the num er 1 key,

nnn

is

the port number

of

the

TIF951

you

want

to

use,

and t

is

any

talk

!

F

9350-7154-000 - Rev

B

Page

-

5

Telex Communications, Inc.

TIF951 Operation Guide RTS Systems Division

ke

.

In

general, you will

also

need to use the listen

key,

S

O

it should be assigned

as

either

d

(auto follow), or

AL

(auto listen).

Note that the TIF951 only responds to commands which are sent via a point to point key
assignment.

If

you wish to

use

the

TIF951

primarily on a

PL,

you must add a point to point

assignment

as

the

L2

talk assignment on the talk key for any panels which are going to

either answer the line, or dial out on the line.

3.1.2

Dialing

a

call:

Any key panel may dial calls on the TIF-951.

To

dial a call on the

TIF951:

1.

Turn

on the listen key for the line you wish

to

dial

on.

This

will

allow you to hear

dial tone, and your

DTMF

dialin tones.

2.

Enter dial mode by entering P

w

ONE-PGM-T.

PHONE

is

the 4 button

on

the

keypad. PGM is the red PGM key

on

the key pad, and

T

is

the talk key which

is

programmed to talk to the "IF951 you

are

dialing

on.

Leave the talk key

in

the up

engaged position

as

you dial the number.

3.

Dial the number.

As

you enter each digit, it will appear

in

the

alpha display above

the ke you

are

dialing

on.

On

panels with

LED

tally,

the

LED

will

flash

on

each

digit.

P

f

the listen key

IS

engaged, you will hear each

DTMF

tone

as

it

is

generated.

4.

When you have completed dlaling, momentarily disengage the talk key

to

exit dial

mode. The alpha numeric display will revert to

normal,

and you may use the key

and key pad in the normal manner.
Note: The key pad is used in the

usual

way. Digits

0-9

generate the

DTMF

digits

0-

9.

PGM generates

#,

and CLR generates

*

(*

and

#

are

displayed for these keys).

If

the last number redial/speed dial option

is

resent,

it

is

necessary to press

CLR

twice

if

you wish to generate a

*,

as

a

single

CF

LR is used to trigger the speed dial

and redial features.

3.1.3

Hanging

up:

The TIF951 will detect that the caller at the

far

end has hung up under most circumstances.

It detects the hang up by either loop interrupt, battery reversal, or the presence

of

dial

tone. Some telephone systems do not provide any

of

the above,

so

it

will

be necess to

force a hang up.

In

addition, if the call

was

placed to an auto answer device, it 3 be

necessary

to

force a hang

up

when the

call

is

complete.

Enter PHONE

-

CLR-t, where

PHONE

is

the 4 button

on

the

key

pa4

0

is

the

0

button, PGM

is

the red

PGM

button, and

t

is

the talk key which

is

programmed to

talk

to the

'IF951

which you

wish

to

hang

up.

This

will

disconnect the line for

which you struck the

talk

key.

Note that if the talk

key

is in

the

on

position, you must

turn

off

the key, then

momentarily turn it on again to indicate which

line

you wish

to

disconnect.

If

the

line is in dialing mode, then you must first exit dialing mode by

turning

off

the key,

then use PHONE-CLR-t

to

hang up.

9350-7154-000

-

Rev

B

Page

-

6

Telex Communications, Inc.

TIF951 Operation Guide

RTS Systems Division

3.1.4

Re-dialing the last number:

The TIF951 remembers the last number which it has dialed.

1.

Enter dialing mode

by

following the instructions for dialing a

call.

2.

Enter

CLR-0-0.

The

TIF

will automatically redial the last number it dialed.

3.

Momentarily release the talk key to exit dialing mode.

Note that the number is remembered on a phone line by phone

line

basis. When the last

number redial command is issued, you

will

get the last number dialed on that TIF951

channel, regardless of which key panel dialed the number.

For

example,

if

you have a call

to 818-566-6700 on channel

1

of the

TIF,

and a call to 201-891-6002

on

the other channel,

and you are disconnected, issuing the redial command

will

re-establish the calls on the

same channels. The redial command may be issued

from

any key panel in the intercom,

not just the key panel that originally dialed the calls.

3.1.5

Dialing a Speed Dial number (stored number):

The TIF951 has

32

internal memories for storing frequently used phone numbers.

To

dial

one of these numbers:

1.

Enter dial mode.

2.

CLR-M

where

CLR

is the clear button

on

the key pad, and

M

is

two

digits, wlich

3.

Momentarily release the talk key to exit dialing mode.

are the speed dial code.

3.1.6

Storing a speed dial number:

1.

After dialing the number the usual way, enter the

CLR-PGM-nn

before .you release

2.

Momentarily release the talk key to exit dialing mode.

the talk key to exit dialing mode.

Note:

To

generate a pause during auto dial, enter *99.

This

is

used for example if

you need to enter

a

digit to get an outside line, and your phone system requires a

pause before continuing to dial.

Each number may contain

up

to

30

digits. Note that the memory for the stored numbers

is

RAM

in

the

TIF951.

The

numbers are unique to each TIF951 channel, and each TIF951

channel can have different numbers stored

in

it. If you plan

to

use the speed dial feature, it

is

advis,able to supply the TIF951 with

UPS

power, to prevent loosing the speed dial

information when

the

power fails.

9350-7154-000 - Rev

B

Page

-

7

Telex Communications, Inc.

TIF951 Operation Guide RTS Systems Division

3.1.7

Answering

a

call:

1.

When a line

is

ringing, the alpha numeric display or

LED

above the talk

key

which

is programmed for that line will

flash

rapidly.

2.

To

answer the call, first

turn

on the listen key, then press the talk key and speak into

the microphone or headset.

3.

If

you have been programmed

as

a default station, your panel

will

"

ring

"

when ever

one of the lines rings.

If

you do not have a key already programmed, the

ringing

line

will a pear

on

your incoming call key (the key farthest to the right

on

the main

panelf:

To

answer, press

the

incoming call key and answer.

You

should copy the

key to main key position, either just before or just after you answer,

so

you can turn

on

the listen

key

to hear the caller audio.

3.2

TIF951

SYSTEM

SETUP

TO

RECEIVE

CALLS

To

the intercom system, the TIF951 is very much like a key anel.

I€

the phone lines are to

be used for outgoing calls only, then

no

programming in CS

k

DIT

is necessary. If users are

going to phone into the intercom from the outside, then the

TIF951 needs to be configured

to allow them to use the phone line in much the same way a local user

uses

his

key panel.

Programming information for the phone line is entered into the CSEDIT software just

as

if

the TIF951 were

an

ordinary key panel, by selectin 'Ke

s"

from the main menu, then

selecting the

TIF951 from the pick list of key panels.

he

AF951 o erates much the same

.

way

as

a key panel, except that the "keys" are really the D &buttons

on

the users

telephone.

32.1

Auto

Answer

Mode:

To

use the

TIF951

in auto answer mode, you must first enable auto answer mode on the

rear panel DIP switch, toggle number

1.

You

may

also

wish to enable Password required,

toggle number

3.

In addition, you may select the number

of

rings before the

unit

answers

(internal DIP switch

#2),

and the actual password (internal

DIP

switch

#3).

When the caller dials into the

TIF951,

he

will

hear the line ring, then the unit

will

answer,

and beep to request the pass word

(if

password re uired is enabled). The user then must

enter the password. The

-

unit

will

beep once to co

2

'rm a proper password.

If

the password

is not correct, the unit

will

beep twice

to

allow another

try.

Once the password has been entered, the

TIF951

will

establish communications

on

key

#1

automatically.

From

CSEDIT,

this

will

be talk and listen keys

#l.

If

for exam

le

the

user

were a camera operator, it

mi

ht be desirable to program the camera PL

as

ta%

and listen

on

talk and listen keys

#l.

if

the caller were a reporter, you might program

an

WE3

on

listen key

#1,

but

no

talk

on

talk key

#l.

Keys

2

to

7

may also be programmed.

To

use

the other

ke

s

from

the phone, just press the

DTMF

button for the

key

you

wish to use. For example, 2 key

#1

was

the camera PL, and

you

have

finished with the

shot,

you may press

#1,

which

will

toggle

off

key

1.

If

master

control were pro rammed on key

#2,

you

may then press 2 and

call

master control.

Likewise, you

mi&t have

an

IFB

programmed on listen

3,

with

no

talk.

If

you press

3,

ou

will hear

the

IFB.

#4

could have an

IFB

talk

on

it,

to allow a caller

to

speak on

an

P

Fl3

circuit.
Each DTMF button acts

as

if

it

were a push on/push

off

switch. When programming in

9350-7154-000 - Rev

B

Page

-

8

Telex Communications, Inc.

TIF951 Operation Guide RTS Systems Division

CSEDIT,

just program the same key number

as

the number the user

is

going to press

on

the telephone to speak.

Talk

keys 8 to

15

have a special purpose.

If

you are not using auto answer mode, but have

set

u

the TIF951 to be manually answered, talk keys 8 to 15

will

be programmed for the

pane

P

s

which are to receive the ring signal. They may also be toggled

on

and off from the

phone by

DTMF

8,

so they may

be

used in auto answer mode

as

well.

You

may program

only key

8,

in which case it will behave the same

as

keys

1-7.

You

may also program

additional panels,

PL's,

IFB's etc on keys 9-15, and they

will

be activated simultaneously by

the

8

button on the phone.

3.2.2

Manual Answer Mode:

In manual answer mode,

the

line will ring until it is answered from a

key

panel. In general,

you must designate panels which are to receive the

"

ring",

so

they

can answer

the

line.

When

a

line is manually answered, the caller does not have to enter a password, even if the

password required switch is turned on.

You

may

mix

modes by enabling auto answer, but

setting

the

ring count for 8 rings. If no user has answered the call by 8 rings, the

TIF

will

then automatically answer the call, and if password required

is

also enabled, the call will be

screened by requiring a password.

To

use manual answer mode, you may choose to program keys 1 to

7

as

above

if

you wish.
When the phone is manually answered, key one will not be automatically activated, but the
caller may activate any of the keys if he wishes.

You

must also designate the panels which are going to ring when the line rings. Program

these panels on keys

8

to

15,

using both L1 and

I2

If

you have more than

8.

It is generally

not necessary to program the listen keys

on

these positions. When the line rings, the

TIF951 will "call" these panels when the line

is

ringing. When the

line

rings,

the

TIF951

generates a ringer noise which is then transmitted to these panels. The panels

will

display

the

TIF95l's alpha numeric

in

the incornin$ call window, and if a talk key has already been

programmed on the panel, it's alpha

numenc

will

flash rapidly.

3.3

Using the

TIF951

from

the telephone:

The TIF951 will behave differently depending on how it is programmed. It is up to the

operator who programs the

TIF951 to convey to the user what to expect.

If

the user is not

familiar with the operation of the

TIF951, it is best keep the operation

as

simple

as

possible, until they are familiar with

its

operation. For this reason, It is suggested that you

not use assword required unless you have had problems with nuisance calls

in

the past.

If

the

TIF

8

51

field user only requires one service, it is best to program that service on key

1,

enable auto answer, and disable password required. The telephone user

will

then only

have to dial the proper phone number to use the interface.

As

they become more familiar

with it's operation, you can then begin

to

offer more options to the

users,

or begin to

require a password.
In general, it is very easy to use,

if

the user has knows what to expect.

When calling in,

if

the unit

is

in

auto answer mode, it

will

answer the call after the number

of

rings whch have been selected.

If

assword required

is

not

enabled, the unit

will

indicate it

is

ready with a single beep. E password required

is

enabled, the TIF951 will

prompt for

a

password with 2 beeps. The user

will

enter the password, and the unit will

9350-7154-000 - Rev

B

Page - 9 Telex Communications, Inc.

TIF951 Operation Guide

RTS

Systems Division

beep once if

the

password was correct, twice

was

wrong. The user

is

allowed 3 attem

ts

to

enter the password, after which the

TIF951

will

disconnect.

In

the event a user

Cass

the

TIF951

when the intercom system is either turned off or absent, the TIF951

will

answer

prompt

with

3

beeps.

Once the password is entered, the

TIF951 will enable

talk

and listen

on

key

1.

This should

be

pro rammed ahead of time to what ever communications the caller generally needs

first.

I

f

it is not desirable for the caller to be able to talk

at

this

point, then

only

the listen

key for key

1

should be programmed.

The caller may then either continue to use

key

1,

or he may

select

other keys with his

DTMF

pad. He may turn off key 1 by pressing

DTMF

1,

or may continue to just add other

keys. At any time, the caller may turn

off

all keys without hanging up

by

pressing

0.

When the call is complete, the caller should enter

*#,

which

will

cause the TIF951 to

disconnect. This

is

more reliable than waiting for the phone system to pass the disconnect

information to the

TIF951.

33.1

DTMF

codes

Once programmed

as

described in section

3.2,

the TIF951 may be o erated via the

DTMF

Touch Tonetm

key

pad

on

the telephone. The

DTMF

keys have the P ollowing

functions:

Normal

Mode:

1

thru

7

Toggle

on

and off talk and listen

#1

to

#7.

Note that initially,

#1

will

be enabled

if

the unit auto answered

the

line.

8

9

0

*1

thru

'7

*8

*#

To

e

on

and

off

talk and listen to the panels which ring when

the

T

'ne is ringing.

This

allows the caller to ''recall" the panels

without having to hang up and redial.

Togglmg this

on

will

allow

the callers voice

to

be heard from

all

the panels which

normally ring.
Enters programming mode, to reassign keys.
Turn

off

all talk and listen keys. Since

1-8

are

toggles, it

is

possible to forget which keys

are

"on"

and which

are

"

off".

In

this

case,

just press 0 to

turn

then

all

off,

and

start

over.

Toggle

on

and

off

listen

1-7.

By pressing * before the key, you

onl

chan e the listen.

This

allows

you

to listen

to

a

circuit

wi

Jaf

out t king to it, or

to

talk

to

a

mcuit without listening to

it. Note that you

will

automatically listen and talk to

#1

if

the

TIF951 auto answered the

line.

Toggle

on

and

off

listen for 8-15.

Disconnect.

This

will

cause the

TIF951

to hang

up.

It

is

a

good idea

to

do this before you hang up,

as

many phone

systems take

a

long time to

signal

that the

far

end has

hung

up.

9350-7154-000

-

Rev

6

Page - 10 Telex Communications, Inc.

TIF951 Operation Guide

Programming Mode:

lnnn#K

2

M#K

01~#K

02M#K

03nn#K

WM#K

3

5#K

lnnn#*K

2

M#*K

3

2#*K

3

3#*K

01

M

#

*K

02

M

#

*K

03

M

#

*K

WIlXl#*K

*9

*O

*#

RTS Systems Division

You

may reprogram the talk and listen assignments on

1-7,

just

as

you can on a key panel

(if

they are not restricted via

CSEDIT).

Note that the se uences are the same

as

the

sequence you would use

from

a

‘fc

ey panel, except that you must

first enter programming mode by pressing

9.

Program a

talk

key to a point to point.

Program a talk key to a

PL.

Program a talk key to a special list.

Program a talk key to an

IFB.

Program a talk key to an

ISO.

Program a talk key to a Relay.
Program a

talk

key to

All

Call

(turns

on

the lower numbered

talk keys)
Program a listen key to a point to point.
Program a listen key to a

PL

Program a listen key to Auto Follow
Program a listen key to Auto Mute
Program a listen key to a special list.
Program a listen key to an

IFB.

Program a listen key to an

ISO.

Program a listen key

to

a Relay.

Exit

programming mode

Exit programing mode and turn

off

all

talk & listen.

Disconnect

Note:

0-9

are the number keys, * and # are

the

star and pound keys.

nnn

is three digits for a key panel number

M

is

two

digits, for an

IFB,

PL,

Relay, Special

List,

or

ISO.

K

is a key which you are programming,

just

press the digit

(1-7).

*K

is the * key followed by a digit

(1-7).

This

is

used to represent the listen

key.

9350-7154-000 - Rev

B

Page - 11 Telex Communications, Inc.

Telos

ONE

plus

ONE

Dual Digital Telephone Interface

User's

Manual

1.1

I'

Telos Systems 2101 Superior Avenue Cleveland,

OH

441 14

(216) 241

-

7225 FAX: [phone]

0

Copyright 1991 by TLS Corporation

.

..I

July

10,1989

A

personal

note:

You

have in your possession a remarkable piece of technology. The Telos One
does what would have been either impossible or impractical only a few years
ago. It relies on

digital signal processing,

a concept

known

to theorists for

years but only very recently available to

us

as

users.

It

is

entertaining to read the

signal

processing textbooks written

as

recently

as

the mid

70s.

The authors describe the state of the

art:

a

few seconds of audio

is

collected

and

processed with

FORTRAN

programs running on million dollar
mainframe computers. Only after minutes (or hours!) of expensive number
crunching did the expectant researchers get to

actually

hear

the brief audible

result.

About the same time,

yours

truly began

his

first

radio

station job. Using

phones on air was always a problem owing to the

familiar

shortcomings of

speakerphones and hybrids. Thus began what was to become many

years

of

tinkering with telephone interfacing. Nothing had worked

-

resulting in

discouragement having become firmly rooted when, in

1983,

articles describing

practical

real-fzme

DSP

began to appear in obscure

journals.

This

was made

possible by the introduction of

single-chip processors optimized for

use

in

manipulating analog

signals.

They cost

$350

-

but I sensed that their

availability signalled the beginning

of

a revolution. The next year and a

half

found me at work weekends and evenings learning the exciting new technology
and experimenting with telephone interfacing approaches using it. By late

1984,

the now famous Telos

10

was the result.

It had the singular virtue among available interface devices that it

acfually

worked.

At last

it

was possible to carry on a

natural

on-air conversation

without the common

up-cutting or distortion difficulties. We put it on the

air

at

WFBQ,

Indianapolis and made a few for

friends.

Slowly, the word spread.

Since

I

was happily employed

and

thus had no compelling interest in Telos'

economic success, it was only amusing

to

observe the digital hybrid technology

take the usual path of any new idea to eventual acceptance:

c

It

wasignored

It

was

accused

(by

other interface

manufacturers)

Of

being

ineflecfive

It

was

accepted

by

users

with tolerance for

tisk

and

novelty

It

was

accepted

by

large

numbers

of

users

It

was

co-opted and copied!

For

a couple

of

years, Telos Systems was operated

as

a

sideline enterprise

while

I

continued to work

as

a

CE.

However,

as

is

now evident,

increasing

sales

caused Telos

to

grow beyond its "garage

"

origins

to become a bona-fide

broadcast manufacturer, adding staff, an office, phones, and

an

occasional ad.

I

finally

even

had

to quit my

job!

Our

research

continued and resulted

a

little

over a year ago

in

the

second

generation Telos

100

hybrid - which advanced the state

of

the

art

by

sigruficantly improving performance

and

taking advantage of

DSP

for the

dynamic processing

functions.

So

here we are

in

the present. The

work

of

the signal processing

theorists

for

decades (actually, centuries Fourier was at it a few hundred years ago!),

our

continuous work over the course

of

the

past

six

years, and the near-incredible

advances

in

digital audio and lowcost computing power have

combined

to

allow the creation

of

a result even

the

digital dreamers would have

been

shy

to predict a decade ago.

We

trust

you

wili

like

it.

Keep

on

keeping

the

GM

happy...

Steve Church
President

I

User's Manual

V1.l

Telos

One

plus

ONE

Dual Digital Hybrid Telephone Interface

1

INTRODUCIlON

1

1.1

Overview

2

1.2

Specifications

6

2

INSTALLATION

7

2.1

Audio

9

2.2

Connection to the Telephone

Line

13

2.3

RemoteControl

13

2.4

Power

Source

14

3 OPERATION 15

3.1

Front Panel Controls

16

3.2

Metering and Level Adjustment

18

3.3

Feedbackcontrol

19

4

TECHNICAL DATA

and

TROUBLESHOOTING

21

4.1

Overview

22

4.2

Digital Section

25

4.2.1

Theory of Operation

25

4.2.2

Troubleshooting the Digital Section

26

4.3.1

Theory of Operation

26

4.3.2

Troubleshooting the Audio Section

27

4.3

Audio Section

26

4.4

Power Supply

27

4.5

IntemalConnections

28

Connector Pinout

Charts

31

Parts List

32

5

DRAWINGS 35

Signal Flow Block Diagrams
schematics

6

APPENDIX

Alternate Software Versions
Warranty and Application Caution
Power Supply Data Sheets

ACCESSORY

PCB

MODULES:

DTMF-to-ROTARY CONVERTER

BASIC AUTO

-

ANSWER

"

SUPER" AUTO-ANSWER

ELECIRONIC PHONE SYSTEM TUTORIAL

'0

SECTION

1

INTRODUCTION

1.1

OVERVIEW

The Telos

ONE

plus

ONE

Dual

Interface

The Telos

ONE

plus

ONE

consists of

two

Telos One digital hybrids

in

one

19

rack mount

enclosure.

The Telos One interface embodies a state of the art approach to

interfacing telephone

lines

for broadcast on-air, intercom interface,

or

teleconferencing use. The very fast and precise digital
automatic nulling hybrid allows smooth, natural, simultaneous
conversation without the

usual

speakerphone upcutting effect or

the audio distortion

and

feedback problems often experienced with

poorer hybrid

-

type interface devices.

As

well, a number of additional functions are accomplished in the

digital domain

in

order to enhance "real-world'' performance.

Included are sophisticated automatic gain control

in

both the send

and receive paths, a carefully

-

implemented override ducking

system, and a pitch shifter for feedback reduction.

Telephone connections

are

via standard modular jacks, while audio

input and output are connected via

XLRs.

Each hybrid

has

one

balanced input with provision for mic or line levels and

two

balanced outputs. The second output may

be

switched to

be

either a

second isolated output or a

mix

of the send and caller

signals.

Purpose

The purpose of the Telos One broadcast telephone hybrid

is

to

deliver

to

the receive output pure caller audio

with

as

little

of

the

send (announcer) audio

as

possible mixed-in. Until digital

signal

processing techniques were applied to the telephone interface
problem, there were

two

choices:

Switching.

The send and receive paths were separated by
having only one talk direction active at a time. The
common

"

speakerphones" use this approach. The

disadvantage

is

that natural conversation is impossible,

since the caller

is

cut-off when the announcer talks - and

vice

-

versa.

2

Tebs

ONE

plus

ONE

-

INlRODUCTION

Analog

hybrids.

These were, on most phone lines,

very

poor at removing the send signal from the caller's audio.

This

meant that the announcer's voice would become

distorted

as

the phone audio was added to the

mix.

(A

full discussion of hybrids and interface systems

is

included in

the

Telos Telephone

Q

b

A.)

The Telos One is a

true digitul

second generation telephone

interface. It

uses

state-of-the-art digital techniques to perform

the hybrid function

-

the subtraction of the

send

from the receive

audio. The input and caller audio signals are converted to digital

.

and operated on in

such

a way

as

to very effectively remove the
send audio from the output while maintaining natural
simultaneous full

-

duplex conversation. The digital approach

assures consistently good trans

-

hybrid loss regardless of varying

phone

line

impedance.

Special Features

The Telos One incorporates sophisticated audio processing

in

the

digital domain

for

gain

control and filtering.

A

digital high-pass filter

is

used

to reduce hum and other low
frequency interference. High frequency noise above the telephone
frequency range

is

also

attenuated.

FREQUENCY

Te

ONE

plus

ON€

-

INTRODUCTION

3

Smart

Digital

Automatic

Gain

control smooths input and output

levels.

A

noise-gate/downward expander

is

provided on the

receive path to reduce phone line noise during caller pauses.

A

switchable

mm*de

function

is

provided to allow ducking of

the caller while the announcer

is

speaking. The override function

includes an

acousfic

ducker

which dynarmcally reduces send audio

when caller audio

is

present

in

order to reduce feedback and aid

natural conversation.

Unique to the Telos One

is

a

special feedback reduction function

using a pitch

-

shifting approach. The input (send) audio

is

shifted

downward

in

frequency

by

4

Hz

to help prevent feedback build-up.

Front panel metering

is

provided for input level, output level,

and

gain

reduction.

Operation

When a call

is

initially established, a brief mute/adapt period

provides

an

opportunity for the system to set up to

the

line before

the

call

is

passed to the output. The caller hears a "noisy tone,

"

but none of

this

tone

is

heard at the output since the output

is

muted

during

this

time.

This

has

the incidental benefit of removing the

line switching

"

clunk." Adaption to the telephone line

characteristic continues

as

the conversation proceeds using voice

as

the driving

signal.

The

Hardware

The

process

of analog-to-digital and digital-to-analog conversion

is

critical to audio quality and hybrid performance.

In

the Telos

One,

IC

converters

called

CODECS

intended for telephone central

office application

are

employed. The

ICs

in the Telos One are

better than the usual telephone

CODECS

in that they use an

oversampling and digital filtering technique

for

the anti-aliasing

and

reconstruction filters rather

than

the usual mitched-capacitor

filter approach.

Thus

noise and distortion are quite

good.

Because the audio processing

functions

are performed in

the

digital

domain, the hardware design of the Telos One

is

quite simple.

Multi-Line

Systems

Telos makes interface modules for multi-line switching. The
Direct Interface Module offers a convenient

and

flexible means to

switch up to

10

telco

lines

with provision for program-on-hold,

additional telephone sets for off

-

air conversation, etc. The

1A2

interface module is for use within a standard

1A2

key telephone

environment.

A

number

of

options

are available with regard to

interface methods, control panels, etc. Please contact

us

for details.

In addition, the

"

Super" Auto-Answer

PCB

module may be

configured

so

that the Telos One

may

be connected directly to

1A2-

style telephones with the telephone itself being

used

as

the line

selection device.

In some cases, the Telos One

may

be interfaced to "electronic

"

telephone systems. There

is

a tutorial on these phone systems

included later

in

this

manual which should be helpful to those

who wish to do this.

I

Te&

ONEPIUS

m~

-

IMRODUCTION

5

1.2

SPECIFICATIONS

System

True digital.

Second

generation Texas

Instruments

TMS320C25

processor.

8

lcHz

sampling rate. Internal digital input and output

gain

processing, filtering.

Trans-hybrid

Loss

>40

dB with pink noise or voice

as

test input. Test set-up

as

specified

in our

Telephone Q6.A. All dynamic enhancement processing is

sm'tched

off.

With the ovemde and output expander

functions

switched-in, trans-hybrid

loss

is

enhanced by approximately 12 dB.

Send Level

to

Phone

Line

-

10 dBm average level. Maintained by intemal digital AGC.

Frequency Response

(caller

to

output)

200

-

3400

H

Z

+-1

dB.

Noise

and

Distortion

(caller

to

output)

Distortion:

c.5%

THD

+

N.

1

kHz;

caller

levels from

-

48

to

-

8

dBm.

Signal-to-Noise:

>60

dB.

Referred to

-

18

dBm phone Iwel. >72 dB

ref

to

0

dBm phone line level.

Send Audio

Input

XLR

female connector. Active balanced. Accommodates

-

24

to +12

dBm levels in

LINE

mode;

-

68

to

-

35

dBm in

MIC

mode. Front panel

screwdriver level adjust.

-;

Caller

Audio

Output

XLR

male connector. Active differential. Output levels to +14 dBm

depending upon der telephone

line

level and adjustment of front

panel level adjust. Will drive

60012.

AdMix

Output

XLR

male connector. Active differential.

In

AUX mode,

this

output

is

an

isolated second output.

In

MIX

mode,

this

is

a combined

send

and

caller output.

INPUT

to

MIX

Output

specifications:

Unity

gain;

44%

THD;

+12 dBm clip point.

6

Telos

ONEplus

ON€

-

INTRODUCTION

INSTALLATION

SECTION 2

8

T~IOS

ONE

PIUS

ONE

-

I

N

S

T

ALLATION

2.1

AUDIO

The drawing on the preceding page shows how the unit may be
incorporated into an on

-

air

studio

environment.

2.1.1

Mix-minus

The Telos One-plus-0ne send inputs should be fed

mix-minus

audio. That

is,

the

mix

of all the sources you want to feed the

phone

minus

the hybrid output itself.

Broadcast

Consoles

Most

modem broadcast consoles make some provision for

mix-

minus. The best allow selective feeds to the telephone system.

This

is

useful since you sometimes want only one mic feeding the

phone, sometimes you want three or four

mics

(during the morning

show, for instance), and sometimes you want to feed cart

machines

when callers need to hear and react to contest effects, etc.

User-Provided

Mix-Minus

For a simple installation, you can just take the patch send or pre

-

amp

output from the mic channel to feed the phone.

This

works
well, but doesn't have much flexibility. One approach which
allows more control

is

to

use

an

outboard mixer

to

combine sources

as

desired. All of the desired sources are paralleled into the on-air
board and the mixer and the mixer's output feeds the hybrid.

Tdos

ONEplus

ON€

-

INSTALLATION

9

Internal

Mix-Minus

in

the

ONE

plus

ON€

The

two

hybrids

in

the One-plus-One unit may be configured

so

that a single

mix-minus

feed may be

used

for both hybrids, with

each hybrid's output fed to the other's input

intetnnfly

ut

unity

gain.

Both hybrid

outputs

still

function independently.

The internal

mix-minus

cross-couples each

hybrid's

receive audio

to the other's input and

sums

the user-provided

mix-minus

to the

inputs. The user

mix-minus

must have

NO

hybrid audio

mixed

in

it. Five jumper pins are

located

on the connector board, marked

JP1.

Move

all

five jumpers from the

"

2

HYBRIDS

"

position to the

"MIX/MINUS"

position. Then feed your

mix-minus

to the

#1

hybrid input. The input to the

#2

hybrid

is

disabled. Both input

trimmers on

the

front panel function normally. The cross-coupled

hybrid audio

is

fixed

at

unity

gain,

relying

on the

output

AGC

to

keep levels

OK.

The block diagram below

and

schematics

should

help to make

all

of

this

clearer.

JUMPERS

SET

FOR

TWO

HYBRIDS

JUMPERS

SET

FOR

INTERNAL

MIXMINUS

Internal

Mix-Minus

Scheme

I

O

Telos

ONEPIUS

ONE

-

INSTAUATIOI'J

c

A

Good

Idea

...

Here's a

useful

scheme for stations which do a lot of taping of calls

for later play

on

the air. The

mix-minus

goes into the left channel

of the studio tape

machhe, while the right channel gets fed

from

the hybrid output. The result

is

a two-track tape with the

announcer and caller audio separated. When you play back

on

the
air, you set the console input to mono and adjust the relative
balance as desired. You also have a tape which is easier to do
production from for contest squeals,

etc.

2.1.2

INPUT

AUDIO

CONNECTION

The input has the following characteristics:

Active balanced.
Approximately

2KR

impedance.

Pin

1

is

ground and pins

2

&

3

are the balanced audio inputs.

Unbalanced sources

may

be

used

by connecting pins

1 & 2

to the

source ground while the signal hot

is

connected to pin

3.

There

are

intemal jumpers

on

the hybrid board to select line or mic

level for the inputs.

On

HDR3

jumper pins

1 & 2

for line level;

jumper pins

2

&

3

for mic level. Be sure to move BOTH jumpers

when

changing

this

function.

LINE

LINE

MIC

MC

With

jumpers

set

to

LINE,

input level

is

-

24

to

+12

dBv

With

jumpers

set

to

MIC,

input level

is

-68

to

-

35

dBv

2.1.3

OUTPUT

AUDIO

CONNECTIONS

There are two separate and independent active differential audio
outputs each with the following characteristics:

Active balanced.

Telos

ON€p/us

ONE

-

INSTAUATION

1

1

Output level

will

vary

from approximately

-

20

dBm to

+10

dBm

depending upon

gain

control adjustment, caller level and

whether or not the

AGC

is

engaged.

Pin

1

is

ground.

Pins

2

and

3

are

the balanced

signal

outputs.

If

an unbalanced output

is

required, connect between ground

and

either of the hot pins.

Do

not ground the unused hot pin.

Note

that

the

output

hl

meter

is

before

the

gain

control.

Main

Output

Caller audio appears on each of the

MAIN

outputs.

AWMIX

Output

The AUX/MIX output

is

either an extra isolated AUXilliary

output or a MIX of the send and caller signals.

Internal jumpers on the hybrid circuit board, on

HDR4,

select

which

of

the

modes

is

to be enabled. Jumper

pins

1

&

2

to

get the

AUX

function,

pins

2

&

3

for the

MIX

function.

MIX

MIX

pux

pux

AlJXNNON MIX

FUNCTK)N

When

in

the

MIX

mode, the input

is

passed to the

mix

output at

unity

gain. Note from the block diagram below that the pass

-

through gain

is

not

affected by the input or output

gain

controls.

However, since the output gain control

does

affect the caller level

in the

mixed

output, it

can

be

used

to adjust the balance between

the send and caller signals.

12

Teb

ONEplus

ONE

-

INSTALLATION

Audio Signal

Flow

(Each HNrid)

2.2

CONNECTION TO THE TELEPHONE LINE

LINE

and

PHONE

Modular

Jacks

Phone connections are made via the standard

modular

jacks on the

rear panel.

Each

LINE

jack is to be connected to

an

incoming central office

telephone line. The

two

center pins

(red

and green) are the Telco

connection, while the

two

outer

pins (black and yellow)

are

a loop

through connection which pass the phone line

through

when the

hybrid

is

not active.

Each

PHONE

jack provides another loop-through connection

which

also

passes

the phone line when the hybrid is not active. It

is

normally

used

for connection

of

a

desk

set

phone.

2.3

REMOTE CONTROL

Female DB15-type connectors on the rear panel provide access to
control functions.

This

connector's functionality and pin-out

depends upon whether the

"

Super" Auto-Answer

PCB

module

is

Telos

ONEplus

ONE

-

INSTAUATION

1

3

3

2.4

installed. (When the

SAA

PCB

is

installed, the rear panel

DB15

is

internally connected to it, and

the

on/off commands and other

functions are

passed

to the hybrid from the

SAA

as

required.

When

the

SAA

is

not installed,

the

rear panel

DB15

goes

directly

to the hybrid.

Without the SAA installed,

OFF

and

ON

control requires a

momentary closure

to

ground. It

is

a standard

‘ITL

input pulled-up

with a

2.2

KR

resistor. Thus, it may be connected directly to

switches or

may

be

driven by

an

open collector or TIZ-compatible

logic output

as

desired.

If

the “Super” Auto-answer board

is

installed, refer to

its

manual

section for details on remote control operation.

rl

?EMOTE

CONTROL PINOUT/FUNCTION

IF

PLUGGED

TO SUPER

AA

PCB

-

1

2

3

4

5

6

7

0

9

10

11

12
13
14

15

-

AUTO

control

input
DROP control input

+5VDC
08 DTMF output

04

DTMF output

D2

DTMF output
Dl DTMF output
SCL
SEIZE control input

Digital Ground

tine

Mode

output

Auto

Mode

output

DTMF Data

Valid

n/C

SDA

POWER

INPUT

IF

DIRECT

TO

HYBRID

PCB

AUTO button

OFF (paralled

from

switch)

+SVDC

n/C

n/C

n/C
n/C

N.O.

A-lead contact

ON

(paralled

from

switch)
Digital Ground
A

-

lead wiper contact

AUTO

LED

n/C

n/C

N.C

A-lead contact

The

ONE

plus

ONE

uses

a universal input switching power supply

which accepts

AC

input at either

50/60

Hz,

from

90

to

260

volts

without any user selection being required.

The line

fuse

is

located on the supply

PCB.

14

Teios

ONEplus

ONE

-

INSTALIATiON

OPERATION

SECTION

3

3.1

FRONT

PANEL

CONTROLS

ONjOFF/AUTO

Pushbuttons

When the

ON

button

is

pressed, the phone line

is

seized

and the

system sends a burst

of

white noise down the line, allowing the

hybrid to adapt to the phone line prior to the

start

of

conversation.

During

this

time, the outputs

are

muted.

At the conclusion of the

mute/adapt period, the output

is

enabled

and the conversation

may

proceed.

When the

OFF

button

is

pressed, the phone line

is

released.

The

AUTO

button

is

a momentary button that, when a "Super"

Auto

-

answer board

is

installed, toggles

the

unit

in

and out

of

the

auto

answer/release mode. Its accompanying

LED

indicator

illuminates when in

auto

mode.

(If

the

"Super" Auto-answer board

is

not installed, this button and

LED

is

brought to the rear panel

remote connector and may be used for any desired external

function.)

Output Processing: Override

This

pushbutton engages

two

independent

functions:

the

culler

ducking

and the

acoustic

ducking

function. In most broadcast
applications, you will find that engaging the override function
results in better overall performance.

Caller

Ducking

This

function operates in

the

caller audio path. When active,

there

is

approximately 6 dB

of

ducking applied to the caller audio

when

the

announcer speaks. However, very little change

in

caller

level will be noticed due to the very high speed operation

of

the

duck function and the

masking

provided by the presence

of

the

send

audio.

I

6

T&s

ONE

PIUS

ONE

-

OPERATION

The purpose of

this

function

is

twofold

Aesthetic Preference.

Many air talents prefer the effect

of having some control over the caller when they speak.

lmprment

of "dynamic

"

Trans-hybrid

Loss.

Acoustic

Ducking

This

function operates

in

the send audio path. The acoustic ducker

works by reducing

the.send (announcer)

signal

dynamically when

the caller speaks.

The acoustic ducker

is

a

used to prevent feedback when open

speakers are being used to monitor callers.

Also,

since

an

open

monitor causes callers to hear themselves fed back

via

the acoustic

path

from

the speaker to the announce mic,

this

function has

the

additional benefit of allowing the caller to perceive a more

natural

sounding conversation.

The time constant

is

very fast,

so

the effect of the acoustic ducking

usually

is

not be noticed by the caller. The only disadvantage

might be that the announcer may

be

less able to break in

on

a caller

who

is

histing upon shouting

on.

Output

Processing:

AGC

The telephone dynamic

gain

processing

is.

enabled with this

pushbutton. The output processing includes both

an

automatic gain

control

and

a

smart

noise gate/downward

expander

function.

T&

ON€

p/us

ON€

-

OPERATION

1

?

0

-

1

0

-20

ourput

-30

Relatii

Level

(dB)

40

"

I

I

-

70

-60

-50

40

-30

-20

-

10

0

Phcm

Line

Led

(dh)

As can be seen in the graph

which

shows the relationship between

telco line level and the Telos One output level, the AGC

maintains

a

constant output level when the phone

line

level vanes between

approximately

-30

and 0 dBm. Below approximately

-

48

dBm, a

gentle

noise

gate/downward expander operates to reduce residual

hybrid leakage and phone line noise.

According to AT&T statistical studies

of

the USA telephone

network, the average level found on standard phone lines

is

-

16

dBm.

In

O

U

T

experience high-volume "choke network" lines

generally have poorer levels.

3.2

METERING AND LEVEL ADJUSTMENT

The meter mode puihbuttons select the desired

function:

Input level

Input gain

reduction

Output level

Output

gain

reduction

The input level metering

is

after the input gain control. After

selecting

MIC

or

LINE

level, adjust the trimmer marked

"IN"

to

get

a

"0"

reading

on

the input level meter

(G/R

-

LEVEL

button out,

IN-OUT

button in) while audio

is

present on the

INPUT.

Turning

this

trimmer up much past the

"0"

LED

rail2

nof

increase
the send level to the phone line due to the digital AGC!
Overdriving the input may result in distortion and very

poor

hybrid performance!

The output level meter

is

placed

before

the output gain control.

This

is

so

that the level may be adjusted to equipment downstream

The Telos' output level meter

(G/R

-

LEVEL

button out,

IN-OUT

button out) shows caller level. Adjust the trimmer marked

"

OUT

"

on the hybrid for a nod

(0

VU)

reading on your equipment while

audio

is

present on the phone line.

Dial

tone

is

OK

for

this,

but

keep in mind that dial tone level

is

about 6 dB hotter

than

voice.

Note:

When the AGC button

is

switched out, the meter reads the

telco line level and

thus

may

be

used to determine

if

there

is

a

phone line level problem. The meter's

OdB indication corresponds

to a phone line level of approximately

-

15

dBm.

3.3

FEEDBACK CONTROL

Sometimes,

even with the exceptional trans-hybrid

loss

produced
by the digital process, trouble with feedback may occur when the
system

is

being used with an open speaker. Generally,

this

happens only with poorer phone lines, or with very weak callers

requiring

lots of

gain

in the phone-to-speaker path.

Some

suggestions

for solution of

this

problem:

1.

Enable the Telos

OVERRIDE

function.

2

When mic processing

is

being

used,

connect the hybrid input in

such a way that it gets the

unprocessed

mic signal.

The

problem

here is that the mic processing combines with the internal Telos

input AGC to increase

gain

in the feedback path when no announcer

audio is present. Depending on the mic processor,

the

feedback

margin

could be reduced by many

dB.

The Telos intemal AGC

has

a

smart adaptive gate to prevent inappropriate

gain

increase, but it

is

thwarted by additional processing. If it

is

not possible to wire

around the processing,

try

to

set

the mic processing gate function

so

that the

gain

is

not "sucked-up" during pauses. You might

also

try

reducing the input level to the hybrid.

The

send level will still

be

OK,

since the AGC

has

considerable range, but the system won't

7elaS

ONE

@US

ONE

-

OPERATION

19

have

as

much room to reach for

gain.

In

some difficult

cases,

it may

be desirable to disengage the Telos

oufpuf

AGC function since it

could reduce feedback

margin

in the same way input AGC does.

3.

Try

repositioning the

mics

and/or speaker. Of course, it also

helps to use

mics

and speakers that are directional. In typical

broadcast studio application.

EV

RE-20s

and

Shure

SM-7's

have

proven appropriate.

4.

Add equalization to the monitor path. Acoustic resonances

usually cause pronounced peaks in the

"

feedback response" of a

sound

system. Since

the

largest peaks generally

occur

at just a few
frequencies, reducing system gain at these frequencies with a
graphic

or

notch

EQ

helps tremendously.

5.

If

necessary, soften acoustic

reflections

in your studio by adding

curtains

or wall treatment.

The foregoing

is

intended to help in those situations where you

must

have an open speaker. Whenever possible, it

is

best to use

headphones to hear callers. When you have an

open

speaker, the
on

-

air phone audio

has

both a

direct

and

an acoustic path - from

the speaker to the announce

mic(s). Depending on the relative

levels, phone audio

quality

may

suffer.

Generally, the best scheme

is

to have the phone monitor speaker

mute when the mic

is

turned

on.

If

you have the announce mics

active to the phone system input even when the

mic

channel

is

switched off, the system can still

be

used

like a speakerphone

when taking

calls

off

the

air.

When

the call

is

to

be

used

on

air,

the announce

mike

is

on,

so

the speaker

is

muted.

20

Telos

ONEplus

ONE

-

OPERATlON

SECTION

4

TECHNICAL DATA

and

TROUBLESHOOTING

Teb

ONE

plus

ONE

-

TECHNICAL

DATA

and

TROUBLESHOOTING

21

kture of broadas

4.1

OVERVIEW

Philosophy

In the past few years, the

m

it engineering

has

changed considerably. At many stations, the engineering staff

has

been reduced

in

size and new responsibilities have been added. At
the same time, equipment has gotten more complicated and
specialized. Thus, many practitioners of the broadcast electronic
arts are forced to become

systems

engineers, emphasizing

equipment application rather than component-level trouble

-

shooting.

This

is

probably a positive development since it really would be
impossible for a station engineer to fully understand the internal
nuances of all the wonderful new high-tech stuff that

is

now
available to improve station operations! Also, as equipment
becomes more sophisticated and specialized,

stocking spare parts

for every eventuality has become difficult.

Thus, we don't really expect that much component-level
troubleshooting will occur.

So,

to support you when you need help,

we keep spare boards available for fast

overnight shipping.

In

most

cases,

we will swap boards with you at no cost. In the five

years since we introduced the Telos

10,

we have yet to charge for a

routine repair.

However, despite the comments above, we do provide full
schematics and component level troubleshooting information in

case you have the need or desire to tackle a repair (or

modification) yourself. Another reason we provide the
information

is

to

satisfy

your curiosity.

If

you are like me, you

probably just

have

to know what's happenin' inside the

fancy

box.

So

we tell you.

General Troubleshooting lnformatlon

CAUTION

The installation and servicing instructions

in

this

manual are

for

use

by

qualiied personnel

only.

To

avoid

electric

shock

do

not perform any

ser

-

vicing

other

than

that

contained

in

the

Operating

Instructions

Unless

you

are qualified

to

do

so.

Refer all servicing

to

qualifii service personnel.

Telos

ONEplus

ONE

-

TECHNICAL

DATA

and

TROUBLESHOOTING

23

Access

to

the

PC

Boards

1)

The top cover

is

removed with a

1/16”

allen key.

This

will

expose all the circuit boards. Refer to the chart to identify the
various

PC

boards.

2)

The power supply and

AC

receptacle are covered by a

small

piece of clear plexiglass.

Do

not remove

this

protective cover or

place

your

fingers

under

it

unless

the ac plug

is

disconnected

from

the unit! When the cover

is

removed the power

supply

has

exposed live

surfaces!

If

the hybrid

PC

board

is

to be removed, continue

as

follows:

3)

Unscrew the four Phillips screws located near

each

comer of the

board.

If

a “Super” Auto-answer board

is

installed, unscrew

its

mounting hardware and gently lift it off the headers. A mounting

bushing

must

be

removed, too.

If

the rear panel

is

to be removed:

4)

Unscrew the

DB15

connector retaining stand-offs.

5)

The

six

XLR

connectors

have retaining screws

which

have to

be

turned

in

order to

be

released.

Do

this

as

illustrated below.

XLR CONNECTOR
RELEASE:

Insert a small screwdriver

intodtholes

in

the

connectors,

shown

3t right. Tumthe screwdriver

about

one

eighth

of

a

turn

counter

clockwise

to

release the connectors. A small s crewdriver

f

XLR

Release

Latches

such as

the

Xcelite

R3322

or

R3381y

need

to

be

filed down me

to

fit

the

s

lots.

Remember to retighten

the

XLR

latc

heswhen

replacing

the

Teios

ONE

PCB.

Thiswill ensure correct

support

for the

XlR

connectors on

the

PCB.

24

Teh

ONE

plus

ONE

-

TECHNICAL

DATA

and

TROUBLESHOOTING

I

Desolden'ng

While we socket the

ICs

that have the greatest potential for

failure, most of the Telos One

ICs

are soldered

in.

That's because

most of the time the socket

is

more likely to cause trouble

than

the

IC.

This

is

of no consolation when one of

the

soldered

ICs

appears

to have failed.

When

you need

to

replace a soldered-in chip, the

right tool is essential. We

use

a vacuum desoldering system made

by Pace (the

MBT-100)

and

highly

recommend it. Cost

is

about

$450

-

worth it

if

you do much

PC

board troubleshooting work. The

only other real alternative

is

to clip the leads from the top

and

remove the solder from the holes with solder-wick. We've not
had much luck with the non-heated, manual vacuum desoldering
devices such

as

the one sold by Radio Shack We do not recommend

that newly soldered connections

be

defluxed.

Digital Signal Processing

Because the Telos

One

hybrid makes use of digital signal
processing for functions traditionally done in analog, the
hardware design of the hybrid

is

relatively uncomplicated and

straightforward. In many ways, the hardware is a

"textbook

implementation of a general-purpose processing system.

As

in

any

DSP

system, the input

signals

are passed through anti

­aliasing low-pass filters to remove signal components above the
Nyquist frequency.

In

this

case,

the

Nyquist frequency

is

4

kHz

and

the ultimate sampling rate

is

8

kHz.

After

A/D

conversion, the signals

are

presented to the TMS320C25

DSP

processor, where software performs the hybrid and processing

functions.

Then,

the signals are converted back to analog and filtered to "re

-

construct" the desired analog audio.

Notation

Whenever a slash

( / )

is

used after a signal designation

in

the text

or on the

schematics,

an

active low

is

sipfled.

Teks

ONEplus

ON€

-

TECHNICAL

DATA

and

TROUBLESHOOTING

25

4.2

DIGITAL

SECTION

4.2.1

THEORY

OF

OPERATION

The Processor and

Bus

'

(Refer to the Processor & 1/0

Logic Schematic in the DRAWINGS

section

of

this

manual.)

The

TMs32OC25

is

a specialized high-speed processor intended for

signal processing applications. Despite

its

unique properties, it
operates much like any other microcomputer from a hardware
standpoint.

Program store

is

provided by the

two

high-speed EPROM

(U2

&

U3).

These connect to the bus and are selected directly by the

32OC25's

assertion

of STRB/, PS/(Program Select/) , and R/(W/).

U6,

an

AC138,

provides the chip select signals decoded in the

usual

microprocessor way by expanding the lower address

lines.

CS7/

is

used

to trigger a watchdog timer,

U7,

at regular intervals.

If

processor operation should fail, the watchdog reacts by asserting

RES/ to the processor, thus restarting it. The watchdog also

provides a reliable reset when the

+5

V

power supply drops below

4.5

v.

U5

is

an output port

used

for the meter

as

well

as

for the control

input to the CODECS

U12

and

13.

U4

is

an input

port

which

is

used

to communicate button

status

to

the processor.

The CODECS have

logk outputs. One

of

these

is

used

to operate

the line and

"A"

relays as well

as

the

ON

and

OFF

LEDS.

Q1

provides current drive to the relay, while the appropriate

U11

sections drive the

LEDs.

CODEC

Interface

The CODECS are interfaced serially to the

32OC25

through its on

-

board serial port. Each CODEC

is

programmed to occupy a time

slot on the serial bus.

26

Teb

ONEplus

ON€

-

TECHNICAL

DATA

and

TROUBLESHOOTING

Clock

and

Timing

4.2.2

4.3

4.3.1

The

timing

chain starts with a

40

MHz

clock oscillator module.

The

40

MHz

output

is

fed directly to

the

32ocL5. The HC390, U9

divides

the

40

MHz

to

2

MHz

in order to generate the CUR and

CLKX

signals

for

U1

and

the CODECS.

This

is

the data clock.

The

HC393 further divides the

signal

to

8

kHz

in order to generate

the Frame

-

Sync input to the

DSP

and CODECS.

TROUBLESHOOTING THE DlGlTAL SECTION

Check the power supply.

Check the

40

MHz

oscillator output and the divided-down clock

signals

to see that they

are

OK.

Unlike

TTL,

the CMOS logic ICs used in the Telos One Hybrid

should have a nice almost rail

-to-

rail

output.

Make sure that all of the required signals are getting to the
CODECS and that the CODECS are

outputting

data.

None of the logic section ICs should get hot,

so

if

any

is,

you've

found

the

problem.

On

rare occasions, a

CMOS

chip

may

latch up

and

get

hot,

but recover

and

work normally when power

is

removed

for awhile

and

restored.

Check

the

16

data

bus

lines

to

see

if

any are shorted. They should

all

exhibit lots of activity,

as

should

the

lower

address

bits.

AUDIO

SECTION

THEORY

OF

OPERATION

(Refer to the Block Diagram and the audio section schematic

in

the

DRAWINGS

section of

this

manual.)

The audio section

is

simple and straightforward. Everything

should be self

-

evident

from

the schematic.

Tebs

OFJEplus

ONE

-

TECHNICAL

DLTA

and

TROUBLESHOOTING

27

U15, a 5532 opamp, provides an active hybrid function. One

section drives the phone line while the other

is

configured

as

a
differential amplifier in order to subtract some of the send audio
before the digital process completes the job. RF3

is

a special pi-

filter network

used

to remove

RF

interference.

The audio input section

uses

one

half

of U16, another 5532 op-amp.

This

is

a standard active differential configuration.

SW8

changes

gain

for either mic or line level inputs levels.

RF1

and

RF2

provide

RFI

filtering.

The other half of U16

is

used

in

a circuit which provides the

output

gain

control and a single pole of low-pass filtering for de

-

emphasis. (The pre-emphasis

is

a digital function provided

within CODEC

U13).

U17, another 5532 op-amp, provides the balanced output for the

AUX/MIX

output port. One section operates as a summing

amplifier;

one

of the summer inputs

is

always connected to the

hybrid output while the other

is

switched by

SW9

to either ground

or the input audio signal.

U14

is

a

special

purpose IC which

has

two

low-pass filter sections

as

well

as

a balanced

6ooR

line driver. The U14 line driver section

provides

the

main

audio output.

4.3.2

TROUBLESHOOTING THE AUDIO SECTION

Using a scope for signal tracing should do the

trick.

All chips

should

run

cool except for non-Signetics brand

5532s

-

if

is

nonnal

for

these

to

run

hot.

4.4

POWER

SUPPLY

The Telos ONE plus

ONE

uses a

4OW

+12W universal input

power supply. Refer to the appendix for manufacturer's data
sheet.

Each

circuit board that requires power locally regulates

the

+12VDC down

to

the required voltage.

Each

board

has

its own

regulators:

+5v

DIGITAL

Powers the processor and other digital

ICs.

Regulated by three-terminal regulator

VR3.

A

gold

cup,

C3,

holds up the power voltage in the event of a brief line voltage dip.

28

Teh

ONEplus

ON€

-

TECHNICAL

DATA

and

lROUBLESHOOTlNG

+5v

ANALOG

Powers all the op-amps and the CODECS.

Regulated by

VR2.

-5v

ANALOG:

Powers op-amps and the CODECS.

Uses

U18,

a

switching inverter, in order to generate a negative voltage which

is

then regulated

by

VR1.

4.5

INTERNAL CONNECTIONS

[

%!E

8

Answer

Telos

ONE

Hybrid

11

%!E

Answer

Telos ONE

Hybrid

Telos ONE

plus

ONE circuit board and

connector identification diagram

T/R

The jacks marked

"T/R

are the "tip and

ring

"

of

the telephone

line.

A

fourconductor cable routes the

main

telco

and

loopthrough

signals

from the rear panel connector board

to

the hybrid.

If

the

DTMF-to

-

Rotary converter board

is

used,

the connector board cable

goes

to

the rearmost

RJll

jack on the converter board; the other

RJll

jack then

goes

to

the

hybrid. That

is,

the converter board

goes

Teb

ONE

p/us

ONE

-

TECHNICAL

DATA

and

TROUBLESHOOTlNG

29

in

series

with

the phone line.

CONTROL

The connectors

marked

CONTROL

route various control signals

from the hybrid to the rear panel

15-pin D-sub connector.

This

cable

runs

from the connector board to the hybrid.

If

a "Super

"

auto-answer card is being used, the

CONTROL

cable on the

connector board

is

plugged to the "Super" auto-answer board's

connector.

YO

This

connector routes send audio to the DTMF-teRotary converter

board (for

DTMF

detection), the ON pin of the auto-answer card

(to mute the hybrid during rotary dialing),

+12VDC

and ground.

Not used

if

the converter board

is

absent.

AUDIO

SIGNALS

Route the audio input, output, aux/mix, mix-minus signals,

+12VDC

and ground

from

the connector

boards

XLRs

and power

supply connector.

+/-

This

is

the power supply connector.

+lZVDC

and ground are

brought to the rear panel connector board, which, in

turn,

distributes these signals to both hybrids via their respective
AUDIO SIGNALS connector.

30

Tebs

ONEplus

ON€

-

TECHNICAL

DATA

and

TROUBLESHOOTING

52

to

P3,P4

REMOTE CONTROL PINOUT/FUNCTION

pin

ws

IF

PLUGGED

TO

SUPER

AA

FCB

I

IF

DIRECT

TO

HYBRID

PC0

2

14

13

13

11

12

9

11

7

10

5

9

3

8

16

7

14

6

12

5

10

4

8

3

6

2

4

1

4

10

7

9

AUTO control input
DROP control input

+5VDC

D8 DTMF output

~ ~~

AUTO button
OFF

(paralled from switch)

+5VDC

n/C

~~

D4

DTMF output

n/C

D2 DTMF output

n/C

Dl DTMF output

SCL

SEIZE control input
Digital Ground
Line

Mode

output

Auto

Mode

output

DTMF Data Valid

n/C

SDA

n/C

n/C

ON (paralled from switch)

Diqital Ground

n/C

AUTO LED

n/C

n/C

n/C

AUDIO SIGNALS

(J1

to

P1

.P21

'AUTO" button
'AUTO' LED indicator

+12VDC

+1

PVDC

GND
GND
output XLR pin 2
GND
output XLR pin

1

output XLR pin

3

d

11
12

13

14

15

16

17
19

-

la

2a

-

aux/mix XLR pin

3

aux/mix XLR pin 2

input XLR pin

3

aux/mix XLR pin

1

input XLR pin 1
input XLR pin 2
extrainput from

JP1

input to 'IN LVL" pot
extra output to

JP1

output of U16

in

7

P

UO

SIGNALS

to

decoder

board

(J4

to

J3,J4)

1

+12VDC

5

GND

4

GND

3

P1 pin 18 INput audio for DTMF converter chip

2

P3 pin

3

'ON' signal from Super Auto answer

board

Telos ONE plus ONE

Connector Cross

-

Connect and Function Directory

Telos

ONEplus

ON€

-

TECHNICAL

DATA

and

TROUBLESHOOTING

31

Tebs

One

plus

One

HYBRID

PARTS

LIST

R1

R2
R3
R4

R5

R6
R7

R8
R9
R10
R11

R12
R13
R14

R15
R16
R17
R18

R19

R20
R2 1
R22
R23
R24
R25
R26
R27
R28
R29
R30
R31
R32

1

OOR

1

OOR

1 OKR
1 KR

560R

1 OKR

1 OKR
1 OKR
1

OOR

33KR

1

OKR
1 OKR
1

KR/ 1

Yo

1 KR/ 1

Yo

1 KR/ 1

Yo

1 KR/ 1

%

lOOKR/l%
100KR/l

Yo

1 KR

2.4KR

1 OKR

49.9R/1%

49.9R/1%

1 OKR
56KR
1 KR

15KR

49.9!2/170

49.9R/1

70

1 OKR
1 OKR
1 OKR

R33
R34

R35

c1

c2

-c3

c4

c5

c6

c7

c8

c9
c10
c11

c12
C13
C14
C15
C16
C17
C18

c19

c20
c2 1
Dl
D2

03

D4

IND1
Q1

RP1

R

P2

Descr-

..

1

OKR

39KR

270KR

2.2pF/25

tant

2.2pFI25

tant

0.1

Farad Gold

Cap

22pF

mono

2000pF

mono

2000pF

mono

.OlpF

mono

2.2pF/25

tant

2.2vF/25

tant

2.2pF/25

tant

1 OOpF/35

electrolytic

1 OOOpFl35

electrolytic

1 OpF/25

tant

0.1pF

mono

2.2pF/25

tant

2.2pF/25

tant

2.2pF/25

tant

01pF

mono

0.1pF

mono

0.1

pF

mono

0.1pF

mono

1N4730 3.9~

zener

1N4730 3.9~

zener

1 N5818
1 N4004
1

OOuH

toroid

2N2222

2.2KR

SIP

33012 SIP

32

Telos

ON€p/us

ON€

-

TECHNICAL DATA

and

TROUBLESHOOTING

Telos One plus One

HYBRID

PARTS

LIST

continued

...

Deslanatlon

u1
U2,3

u4
u5
U6
u7
U8

u9
u10
u11
U12,13

U14

U15,16,17

U18

T1

K1,2

Descrlptuan

..

TI 320C25

27C292-3JL EPROM
74AC244
74HCT374
74ACT138
DS1232 watchdogheset
74HC590
74HC390

Saronix NCH080C-40Mhz osc

74HCT04
AMD7901CPC CODEC
2912A

5532 op-amp

MAX636 switching inverter

Prem

#SPT-195 xfmr

Omron

5v DIP relay

Pesianation

J1

J2,3

J4

53

VR

1

VR2,3
z1

P1,2
SW1,2,3,4
SW5,6,8

sw7

RF1,2,3
L1,2,3,4,5,8

L6,7
L9

DescriDtlon

Neutrik NC3FDHBAG

XLR

fr

Neutrik NC3MDHBAG XLR

I

DB15 female
modular phone receptacle
7905

-5v reg

7805 +5v reg

150v ZNR
10K rt angle multiturn trit

Alt action switch
Mom switch
Two pos DIP sw
TDK

Z7K51 R1-05 RF filte

Green LED LTL

-

1234A

Red LED LTL

-

1224A

Yellow LED

LTL-1254A

TeM

ONEPIUS

O

N

E

-

TECHNI

C

AL

DAT

A

and

TROUBLESHOOING

33

DRAWINGS

SECTION

5

Te&

ONEplus

ONE

-

DRAWINGS

35

DRAWINGS:

Hybrid Signal

Flow

Block Diagram

TMS320C25

Pinouts

Hybrid Digital Circuits Schematic

Connector Board Schematic

Hybrid Input and Output Audio Schematic
Hybrid Phone and Control Schematic

AWYIX

-I

@

pfwcK

t

ousnc

ITE

NOSE

NERATOR

I

I

WE

Digital

Processing

Section

Telos

ONE

PLUS

ONE

Signal

Flow

Block

Diagram

F

Telos

ONE

PLUS

ONE

TMS320C25

Pinouts

INPUXLR

1

Jl

AUWMlX

XLR

152

cxnPul

XLR

1J3

RahE

1 J6

UN

INPUT

XLR

Ul

AUWMIX

XLR

22

OUTPLITXLR

2J3

RahE

2J6

UH

II

3l

2

.

-

/I

c

2

4

6

8

10

1

II

5-

60-

P1

P3

P5

P2

P4

P6

J

1

P7

'3

Telos

ONE

PLUS

ONE

,a

-

connector

board

J1

41

I,

02

e,

J6

05

P1

(IN

LVL)

-

Telos

ONE

PLUS

ONE

input & output audio

e

J3

e

HDRl

+5v

f

DATA
LINES

0-7

Tela

ONE

PLUS

ONE

phone & control

APPENDIX

SECTION

6

TELOS ONE

HYBRID:

ALTERNATE

SOFTWARE

VERSIONS

1

.x:

4.0:

4.x:

The Telos One

is

a "true" digital-signal-processing system. That
means that most system characteristics are fixed by the software
which

is

contained within

two

EPROM chips.

This

provides us
with the opportunity to change the hybrid's audio operation to
accommodate special or unique

cinrumstances by merely swapping

the

EPROMs.

A

number of special software versions have become more-or-less

standard.

This

are described below. There are, in addition, a few

more which have

been

developed for unusual applications.

If

you think you need special software, either the versions listed

below or something

really

different, please contact Telos.

Note:

If

we know

or

think that your hybrid

is

to

be

used

for

intercom interface applications, we automatically install version

4.X

soffware.

In

each case below, there

are

two

components to the version number.

The number before the decimal point

is

the series number and
defines the basic characteristic, while the portion after the
decimal point changes

as

improvements or minor changes are

implemented.

Normal Telos ONE operation

This

is the software normally shipped with Telos Ones. It

implements the operating characteristics described earlier

in

this

manual.

Bell Atlantic Teleconference Version

Has

limiter on

send

audio instead of AGC. Symmetrical ducking

with about

14

dB on each path. Best for making multi-line

conference bridges.

"ABC-TV Version

"

-

For Interfacing 4-Wire

Intercoms

Same

as

4.0

but provides 6 dB more send level.

Also,

ducking

modified somewhat

-

favors receive. Widely

used

with McCurdy,
Clearcom and other 4-wire intercom systems. Permits multiple
lines to be conferenced without feedback, etc. Telos has

c

I

considerable experience in

this

area. Please

call

with your

special

requests

and

unusual

applications.

5.X:

The "Dallas" Version.

Developed in response to the very bad phone line conditions which

exist

in

the

Dallas/Fort

Worth

and Miami/Fort Lauderdale areas.
For some reason, these parts of the country have exceptionally bad
phone service. Levels

vary

over a

30

-

40

dB range and line
impedances are particularly difficult for the hybrid to
accommodate.

This

version adds more ducking

in

both directions,

increases the

AGC

action, lowers the receive expansion threshold,

.

and alters the adaptive hybrid parameters to effect better trade

-

offs for bad phone

lines.

Outside of

Dallas,

this

software

is

for people who:

1)

Prefer a more of "speakerphone

"

switching

effect.

2)

Prefer a more aggressive

AGC

action on the phone audio.

3)

Need to accommodate very poor phone

lines

with widely

4)

Have

open

monitor speakers and

are

having

trouble

with

varying levels.

feedback

When

the phone line impedance

is

very complex. The Telos

ONE'S

analog

hybrid then leaks too much during

send

audio, causing the

digital

hybrid to halt adaption. Version 5.x

software

can tolerate

more leakage, due to a change

in

one

of the adaption parameters.

Secondly, a

"

see-saw" ducking effect has been added. That

is,

the

ducking

occurs

on the send path during receive and

on

the receive

path during send. The level of the ducking

is

about 15

dB,

yet it

has a very fast recovery time and

is

biased more toward the

receive side. The full

-

duplex operation

is

not affected, just the

level

of

the ducking (about

6

dB

with standard software). The

expansion threshold level has been reduced

so

lower-level callers

don't get expanded down.

AII

this,

along with Telos' digital pitch

shifter and digital

AGC

helps the hybrid adapt better to poor

phone

lines.

6.X:

"

RTS Version

"

This

is

the preferred version for connecting

RTS

or other 2-wire

intercom system

to

the Telos

ONE

phone jack. Stays on

continuously.

A

change

in

the adapt threshold allows send level

to be increased with a resistor for

RTS

operation.

WARRANTY

and Application Caution

The Telos One is warranted to

be

free from defects in material and

workmanship for a period of

365

days. Written notice of claim must
be received by seller within the warranty period. In the event of a
defect during the warranty period,

if

customer returns the defective

part

or

the Telos One to a place designated by the seller,

transportation prepaid, seller at

its

option, will either repair

or

replace

the part

or

the Telos One, anti such action

by

seller shall

be

the full
extent of seller's obligation hereunder. Seller will pay the
transportation charges to return the part

or

unit to the customer. Of

course, the warranty is void

if

the unit is subject to misuse, accident,

neglect

or

damage.

No

other warranties express

or

implied, all

of

which are specifically

excluded, including, but not limited to, the warranties

of

merchantability

or

fitness

for a particular purpose, shall

be

applicable
to any equipment sold hereunder, and the foregoing shall constitute
the sole right and remedy. In no event shall the seller

or

it's

agents

be liable for incidental

or

consequential damages, or

for

loss,

damage,

or

expense directly

or

indirectly arising from use of the

products, or any inability to use them either separate or in

combination with other equipment

or

materials,

or

from any other

cause.

The Telos One Interface is intended to

be

used

with

FCC

registered

protective interface devices.

rn

RUT€:

POWER

SYSTErnS

@

9301-101

Jordan

Avenue,

Chatsworth,

CA

9131

1

Tel:

(818)

341-6123

Fax:

(818)

341-5726

WE

OFFER

...

+

High

Volume,

tow

Cost

Manufacturing.

+

90-260

VAC

(continuous) Universal Input.

+

Consistent On-Time Delivery.

+

Adherence

to

Industry Standards.

+

Extensive Engineering Capabilities.

+

Rapid Turn-Around

on

Custom Products.

+

Price,

Delivery and Quality

SINGLE

OUTPUT MODELS

I

‘;

3.55’

x

5.4’

40

Watt

UPS40-3003

E133148

@

;;;;y

uL1950

LEVEL

3

A

.-

-

A

VDE

EN60950

APPROVAL

A98290

PENDING

ON

r~v-

IEC950

65

WATT

MODEL:

-

uP!502003

40

N

g

3.0.4

tzv

@

2.w

(4.5A)

-12v

@

03

3.0

X

5.W

X

1.20

455’

x

255-

upSu)3063

40

5v

@

3.0.4

1ZV

@

2.M

(4%)

-1ZV

@

03

5.40

X

3.55

X

124

482‘X~W

.

UPSS1)1002

50

N

Q

3.w

12V @ 3.OA

(5.W)

20

x

7.00

x

1.57

6.W

X

1.W

vps5I~zooz

50

5v

e

4.w

1

n

@

3.w

(5.0.4)

3.00

x

5.W

X

120

4.55’

X

255’

YW

30W.

40W

5

50

Wall

Accessory

PCB

Module

DTMF=TO=ROTARY

CONVERTER BOARD

Tela

ONEplUs

ONE

-

DTMF-?O-ROTAF~Y

CONVERTER

BOARD

DTMF-TO-ROTARY

CONVERTER

BOARD

PURPOSE

The DTMF-to-Rotary Dial converter board takes DTMF (dual
tone

-

multifrequency signals, or touchtonesB) and converts them

into rotary dial (decadic)

make/break pulses.

THEORY

OF

OPERATION

The phone line

is

passed through this board, which

has

a loop

-

current detector and t -.&e/break relay. Another relay

is

used to

talc the hybrid off the .me line during pulse dialing.

Thi ..3nes

are

fed from

.

.J

input of the hybrid (send) to a DTMF

recerver chip, which, in

rum,

drives the pulse dialer IC.

An

LED

on the board indicates on

-

hook, off-hook

(OK

to dial) and time

out. The pulse dialer chip

is

buffered from the relays with

an

open-collector output device. Another signal

is

taken to the

hybrid's

ON

pin to

turn

the hybrid on during

pulse

dialing

and to

hold the hybrid in the mute state. This prevents the

"

clicks and

clunks" of the pulse dialer relay from being audible. The hybrid's

telco line is fed into a phantom talk battery during

dialing,

to keep

the

"

Super" Auto-answer line detection circuitry from releasing

the line by

tuming

the hybrid off.

There are

two

independent decoder circuits per card. Some

ICs

are

shared by the

two

circuits, however.

When

the DTMF-to-Rotary converter board

is

being

used,

the tones
are received from the hybrid send audio. That means that the
send gain trimmer

affects

this

level and the LED meter indicates

it.

If

the tones are too hot (input meter

OVL

LED

is

lit during the

presence of tones), the input trimmer must be

turned

down or the

tone level reduced externally.

If

the tones are being clipped,

the

decoder board

may

not properly recognize the tones.

Special Note Regarding Phone Lines

With the DTMF-to-Rotary converter board installed, the unit
must be connected to a

"

pulse dial only" line.

If

the phone line

can

detect DTMF, the unit will not dial properly, because some of the

Telos

ONEplus ON€

-

DTMF-TO-ROTARY

CONVERTER

BOARD

tone

will

make

it

to

the central office equipment

we

the pulse

dialer begins. Then the pulse dialer

will

repeat

the

last

digit

dialed.

DTMF-to-Rotary Converter

Board

PARTS

LIST

u1,2 DTMF decoder (Teltone M-957) C1,2
u3,4 DTMF-to-pulse converter (Teltone M-969)

270pF 0 1000

U5,6 Optoisolator 4N33 C7,8

u7 hex inverter 74LS14 C9,lO
U8 Quad NAND gate 74LSOO x1,2

u9 Octal open collector driver ULN2003

R1,2 1 MR1/4W

5%

VRl

R3,4 330R 1l4W

5%

BR1.2

R5,6,7,8 150R 1/4W

5%

L1,2

R9,lO 330R 2W

5%

J1,2

R11,12,13,14 75R

2W

5%

J3,4

DPDT relay

R15,16,17,18

1MR 114W

5%

su3,4

R19;20

47R 1/4W

5%

SU5,6

R2 1,22 150R 1l8W

5%

SU7,8

R23,24 910R 1l4W

5%

su9

R25,26 220R 114W

5%

nescm

2.2pF @ 25V
C3,4,5,6

..

not stuffed
not stuffed

3.58MHt crystal
K1,2,3,4

+5V regulator LM7805

bridge rectifier

green

LED

dual

RJ11 jack

6

-

pin 0.1 " connector

20

-

pin socket BU2OOZ

6-pin socket BU060Z
14-pin socketBU140Z
16-pin socket BU 160Z

Telas:

ONEPIUS

ONE

-

DTMF-TO-ROTARY

CONVERTER

BOARD

wl

1

lo''

'

I

1

I

d

f

r

+-

r

-1

J

Accessory

PCB

Module

BASIC

AUTO-ANSWER

BOARD

Teks

ONE

plus

ONE

-

BASIC

AUTO

ANSWER

BOARD

BASIC AUTO-ANSWER BOARD

Purpose

The auto-answer board

is

used

when automatic answering and hang-up of

the Telos One hybrid

is

desired. The circuit

turns

the hybrid on

in

response

to ringing voltage on the

connected phone line, and

turns

the hybrid off

when a break

in

loop current is detected. The loop current interruption, often

referred to

as

CPC,

or Calling Party Control,

is

present on most telephone

lines. However, some central office equipment or

PBXs

may not provide it

and other detection methods will have to be

used

in

that

case.

Installation

The board is installed by plugging

it

into the header connectors on the Telos

One board. Remove

the

small

jumper plugs on

HDRl

first.

The auto-answer board should be removed and the jumpers replaced

if

use

with other than Central Ofice

-

type lines with talk battery is expected,
since the diodes in the loop detect section will cause severe audio
distortion

if

not biased

by

talk battety.

Operation

Not much excitement here. With the board installed, the hybrid will
automatically answer and hang

-

up.

Circuit Description

U1,

R4, and

C2

form

the ring detect section. C2 blocks

DC

so

that only the

AC

ring

voltage will trigger

U1.

When Ul's diode gets current, its transistor

pulls

HR1-2 low

turning

the hybrid on. C3 prevents false tripping.

The remaining components

form

the loop current detector. When loop

current

is

present,

U2's

transistor conducts

and

C1

is

discharged. When loop

current

goes

away, C1

charges

through the diode

in

U3

thus causing a low at

HR1-1 for the length

of

the R3/C1 time constant. Upon restoration of loop

current, the capacitor discharges through

R5 and

D5.

The C1/R5 time

T&s

ONE

PIUS

ONE

-

BASIC

AUTO

ANSWER

BOARD

constant prevents faking during

initial

answer by preventing

C1

discharge

on brief

periods

of

loop

current

presence.

Basic

Auto-answer Board

PARTS

LIST

Desianation

Description

Desianation

Description

U1,2,3

opto-isolator

4N33

R1

1

oon

Dl ,2,3,4

1

N4004

dioide

R2

2200

D5

1

N4148

diode

R3

2.2Kn

c1

6.8pF @ 25V R4 2.2KQ

c2 0.47pF @ 200V R5 4.7MO
c3 3.3pF @ 25V

Tebs

ONEplus

ONE

-

BASIC AUTO

ANSWER

BOARD

Telos

basic

AutoAns

Rev

3.1

Accessory

PCB

Module

"

SUPER" AUTO-ANSWER

BOARD

Telos

ONEplus

ONE

-

SUPER

AUTO

ANSWER

BOARD

I

INTRODUCTION

GENERAL

DESCRIPTION

The “Super” Auto-Answer board

is

a plug-in PCB module for the Telos

One which provides reliable auto

-

answer and disconnect

as

well as other

functions:

*Remote control for

sed,

drop

and

auto

functions

Status

indicators for off-hook condition and auto mode

Open collector

outputs

from an integral DTMF decoder

Selectable answer

on

first ring or after

three

rings

Disconnect on drop

or

reversal of talk battery (CPC)
Disconnect on dial tone detection (selectable enable/disable)
Auto mode enabled by remote button or dip switch position

.

Since the unit’s operation is controlled by a microprocessor, the

functionality may

be

changed by reprogramming the EPROM-based processor.

For instance, future versions may be configured with an

I

2

C serial bus

interconnect,

so

that multiple

units

could communicate with a master

controller. The software

-

based control logic permits configuration for

operation on non

-

standard (or non-USA) phone

lines

as

well.

ANSWERING

FUNCTION

The auto-answer board responds to the standard USA ringing signal of

90

VAC

at

20

Hz.

The system

is

protected from the false detection sometimes

caused

by dial-pulses on adjacent

lines,

or other causes, by a software function

which counts AC

cycles

and integrates them over time.

DISCONNECT FUNCTION

Disconnect may result from any of the following:

Loopcurrent interruption
Loopcurrent reversal

Detection of dial tone (selectable)

Loopcurrent interruption

occurs

on most telco lines when the calling party

hangs up. It is sometimes referred to

as

CPC, or

CaZZing

Party

Control,

since

the

CaZZing

party

controls

your

equipment when he hangs up. The CPC

Telos

ONE

plus

ONE

-

SUPER AUTO

ANSWER

BOARD

interruption was probably never intentional, having

been

a by-product of

early

mechanically-switched relay-controlled exchanges.

Thus,

some phone

lines

do not provide

this

function or they provide it unreliably. However,

with the proliferation of answering

machines

which rely upon CPC, most

central office equipment now

has

this

capability designed

in.

In

some

cases,

though, it

is

necessary to specifically request

this

feature from the phone

company on a per

-

line basis.

Loop-current reversal, on the other hand,

has

long

been

a phone company

signalling method. First used between the telco's

own

central offices, loop

­reversal was later employed to communicate with some large premises PBX
systems.

Thus,

lines

which

are

set up for for PBX

use,

or originate at central

offices with large concentrations of business customers, sometimes

use

this

method. (However, the preferred and more modem situation for PBX control

is

to

use

either "ground-start lines" or

"EM

signalling.

" A digression from

matters relevant here. Both are discussed in the

Telos Telephone

Q&A

-

which you should have, since it comes packed with every Telos hybrid.)

As

mentioned above, while most exchanges do provide CPC, there are
some that don't reliably provide it, or provide it after a variable time
delay

...

and

most PBX's don't generate it. For

this

reason,

this

"

super" auto

-

answer board

has

a "failsafe" dial tone detector. Every

(USA)

telco central

office eventually

returns

dial tone to

its

lines when the calling party

hangs

up.

Thus,

we

use

the presence of dial tone to

cause

a

~~SCOM~C~

when the

loopcurrent detection methods fail.

The auto

-

answer board uses a sophisticated software-implemented

statistical approach to ensure that the line

is

never inappropriately

disconnected.

Four

tones

are

continuously monitored:

350,440,480,

&

620

Hz.

When

the

two tones

(350

&z

440

Hz)

which comprise

dial

tone

are

detected

as

simultaneously present, a onesecond detection "window

"

is

opened. Only

if,

during

this

window, both dial tones are present for more

than

W/O

of the time

and both of the other tones are present for less

than

20%

of the time

is

a valid

dial tone condition decided. In this way, false

"

talk-off" from noise,

applause, or other spectrally

-

rich audio

is

prevented.

Tebs

OrvEplus

0rv"E

-

SUPER

AUTO

ANSWER

BOARD

REGARDING DETECTION

OF

DIAL AND DTMF TONES IN

SYSTEMS

WITH

CONFERENCING

CAPABILITY

The

auto-answer board is connected

so

as to receive the hybrids

separated telco

receive

audio signal. Were this not the case, and the

detector was merely connected across the phone line, there would be

a

major

problem when multiple lines are used together in a conference. Why?

Because the tones would be conveyed to each line in use (through the
switching matrix)

from

mety

other line, causing all

of

the detectors to

respond to the tones

from

all

of

the other lines as well as its own!

Fortunately, the

Telos

One's excellent trans-hybrid loss keeps

this

from

happening. Aren't you glad?

Tebs

ONEplus

ONE

-

SUPER

AUTO

ANSWER BOARD

INSTAL

LA

TION

Installation consists of removing a jumper plug from a header connector on

the Telos One and plugging

in

the auto-answer

PCB.

The auto-answer board should be removed and the

jumpers

replaced

if

use

with other than Central' Ofice

-

type lines with talk battery is expected,

since the diodes in the

loop

detect section

will

cause severe audio distortion

if

not biased

by

talk battery.

1)

Remove the Telos One front panel by removing

the

two

black screws on

either end of the front panel. Pull the top

case

forward to remove it. Remove

the

two

similar

screws on the back panel. Hold the rear bezel and gently pull

the rear panel and

main

PCB

out of the bottom case.

2)

On

the bottom of the

PCB,

solder a

small

piece of wire from

U14-4

to

HDR1-5. (The header

is

numbered 1,3,5,7 on one side and

2,4,6,8

on the

other.)

This modifcation. need not be done

on

units w'th serial numbers

greater than

08-100-00901 - Reo.

C

or

later

PCBs.

The jumper wire allows

the auto

-

answer board to have access to the hybrid-separated telephone

receive signal.

HDRl

&

HDR2

locations

and

pinout

3)

The auto answer board mounts on

HDRl

and

HDE.

First, remove the

jumper plug which should be installed across

HDR1-7 and HDR1-8. Line up

the

two

headers

with

the

two

PCB

connectors and push down on the board.

Make sure both headers

are

picking up

all

the pins!

Teb

OnrEplus

ON€

-

SUPER

AUTO

ANSWER

BOARD

4) Replace rear panel with the new one, mount the DE15 remote

connector,

and

plug the ribbon cable into the

PCB

socket.

5)

Set the auto-answer dip switches for the desired options (described in

the operation section next) before reassembling unit.

OPERATION

SOFTWARE VERSION

AA

VLl

DIP

SWITCH

OPTIONS

Some user-selectable options are provided via a 4-position DIP switch

located in one

comer of the auto-answer PCB.

Functions

are

as

follows:

Dip

#1:

Auto mode permanent enable. Intended for when

no

remote

control of auto

enable/disable

is

available. When on, auto-answer mode

is

always enabled. The remote AUTO input

has

no effect and the remote

Drop/Seize inputs

will

not disable the auto mode.

Dip= Futureuse.

Dip

#3:

Dial tone detect enable/disable. When on and the unit

is

in

auto

mode, will cause a disconnect when

dial

tone

is

present for

=

1

second, or

longer. When

this

switch

is

off, only an interruption or reversal of loop

current will cause a disconnect: dial tone

will

have no effect.

Dip

#4.

The numbersf-rings selector. When on

(and

the system

is

in auto

mode) the unit

will

answer

on

the third

ring.

otherwise, the answer

occurs

on

the first ring.

REMOTE

CONTROL

Remote control of the hybrids

ON/OFF

functions,

as

well

as

the auto

mode, are available on the rear panel

DB15 connector. Remote buttons are

momentary and ground

-

common. (That

is,

they are normally pulled high
through a resistor and taken to ground to activate.) Refer to the connector
pin

-

out table for assignments.

When the

SEIZE

input

is

brought to ground, the auto board

turns

the

hybrid on and disables the auto mode (except

if

DIP #1 is on). When the

DROP input

is

brought to ground the hybrid will

tum

off

and

disable the auto

mode (again, except

if

DIP #1

is

on). The auto mode

is

disabled upon press of

either

of

these buttons

so

that the unit doesn't hang up

from

the dial tone

that would be present on the line when the

et

is

activated

in

order to

Telos

ONEplus

ONE

-

SUPER

AUTO ANSWER

BOARD

originate a

call.

The

AUTO

input

also

requires

a momentary pushbutton, but

is

made to

be

alternate action

in

operation.

Each

time the button

is

pressed,

the

auto mode

will toggle to the opposite state. Power

-

up

is

to the "no auto" mode (unless

DIP

#1

is

active).

The

LINE

STATUS

output will be made

low

as

long

as

the hybrid

is

active.

An

external pull-up resistor to the

+5V

pin

is

required to drive an

LED

or similar indicator, since

this

output

is

driven by

an

open collector

device. Should someone press the hybrids front panel

ON

button, the

LINE

STATUS

output will flash a few times before staying on.

This

feature

is

intended to alert anyone watching the remote panel that someone

else

has

activated a unit locally. Neither the front panel

ON

or

OFF

button will

affect the auto mode.

The

AUTO

MODE

status output

is

also

an

open

collector output.

It

is

made

low when the system

is

in the auto mode.

Telas

ONE

@US

m€

-

SUPER

AUTO ANSWER

BOARD

DTMF

TOpiE

DECODER

The auto-answer board brings out to the connector five signals

from

a

DTMF

(TouchToneGD) decoder:

four

DTMF

DATA bits and a DATA VALID

signal. The tones

are

decoded and presented according to the chart.

These

outputs

are

pulled

up

(weakly) on the auto board and thus

may

be

used

as

inputs to standard

TTL

and/or

may

be "wiresred" with other boards for

special

applications.

i

Low

Group

Frequencies

(Hz)

697

no

852

941

High Group

Frequencies

(Hz)

1209 1336 1477 1633

i

3.",.%,.,*

......

+v

..

,..-,....

>

.....

1

:...v

....

i

...............

Ft"jTktj.q/

l-&kjpq{*l.-".

;

..~.~t".i~~.i~i.-.",.-~

,

i*

,,

0

~.,

#

,

$

*-:

.:

A

;

>***e

U.

......

....I

......

....

.........

.:..*

J

I

;

..... ......

..........I

.........

:

........

m

.

....,.

..

.".

c

i

............

..

.....,......

................

OPE

,~

...e.

u.

.-.-

.d

D

...................

Frequencies

and

Buttons for

DNF

Generationrnetection

Tebs

0NEplu.s

ONE - SUPER

AUTO

ANSWER

BOARD

I

DB15 PINOUTS (REMOTE)

1

r

1

2

3

4

5

6

7

8

9

10
11
12
13
14
15

AUTO

control input

DROP

control input

+5VDC

D8 DTMF

output

D4 DTMF

outout

02 DTMF

output

Dl DTMF

output

SCL

SEIZE

control input
Ground
Line

Mode

output

Auto Mode output

DTMF Data

Valid

dC

SDA

Charts showing the hexadecimal codes for the touchtone decoder

and pinouts for the 75-pin remote control connector.

SOFTWARE

VERSION

AA

VU

This version of software functions similarly to

AA

V1.1

with the

following differences:

1)

The SEIZE input no longer disables the

AUTO

function

when pressed.

2)

The SEIZE input can

also

be

used

as

a MAINTAINED input. That is,

if

the SEIZE input pin

is

held

LO

(to ground) for more

than

about

2.5

seconds,

the hybrid will

turn

on (obviously) but will

turn

off

(release the line) when

the SEIZE input returns to a logic

HI

(+5VDC).

3)

The DROP input will not disable the

AUTO

function while the SEIZE

input

is

held

LO,

but will

turn

the hybrid off still.

If

the SEIZE input

is

used

for momentary action, however, the DROP input will disable the auto
functions just like

AA

V1.1.

This means that the operator can still enable and disable the auto

function from a momentary

LO

signal on the

AUTO

pin while the SEIZE input

is

being held

LO.

If

the DROP input

is

brought

LO

while the SEIZE input

is

being held

LO,

the hybrid

will

turn

off but the auto function cannot be toggled

anymore

via

the

AUTO

input. The auto function will remain

in

the state it

DTMF

OUTPUT

CODES

1

Telos

ONE

@US

ONE

-

SUPER

AUTO

ANSWER

BOARD

was in when

the

DROP pin went LO.

This

is

done to signal the operator that

the device that initially turned

the

hybrid on via a maintained

closure

has

not released the

SEIZE

input yet. The ON/OFF and

AUTO

outputs will

still

function normally.

All

other

functions

of

AA

V1.1

have been retained.

SOFTWARE

VERSION

AA

V20

This

software version is designed for

use

with multiline

1A2

key system
telephones. It will turn the hybrid on whenever an active line button is
pressed on the key phone and turn the hybrid off when the line button

is

popped up, either by hitting another button half way, pressing an unused
button

(i.e. no phone line connected for that button),

hanging

up

the

handset

or placing a line on hold.

Circuit modifications: The

ring

detector optoisolator,

U3,

should be

moved to the voltage detector circuit,

U4.

R2

should be

33KQ

C5 must be

removed, and the

DTMF

receiver chip,

U7,

should not

be

stuffed.

Call

Telos

if

you'd like the

DTMF

decoder option restored to your unit.

Key phone modification: One key phone must be modified to get

T/R

audio from the selected line to the hybrid. Inside the phone, a

RED

and a

GREEN

wire

go

from

the switch bank to the network under the touchtone pad,

the RED wire to terminal

6,

the GREEN wire to terminal

8.

Remove these

wires from the terminal block and run them to the hybrid's

LINE

modular

jack. Now take another pair of

wires

and

run

them from the hybrids

PHONE

modular jack BACK TO THE

TERMINAL

BLOCK pins

6

&

8.

Essentially,

we're putting

the

hybrid IN SERIES with the phone he that has 'been

selected. That

is,

when the hybrid

is

in its

OFF

mode the phone line

is

looped through the hybrid back to the phone's network.

When

the

hybrid

turns

ON, a relay closes, moving the

T/R

from the phone and into the hybrid.

DIP

SWITCH

OPTIONS

DIP

#l:

When on, enables the

AUTO

function; when

off

the

AUTO

'

function can be toggled on & off

via

the

AUTO

button input provided on the

connector,

J7-1.

DIP

Not supported.

DIP

#3:

Dial

tone detect enable/disable. When on and the unit

is

in auto

mode, will cause a disconnect when dial tone

is

present for

=

1

second, or

longer. Same

as

V1.l.

You

might want

this

option active if your talents tend

to select inactive lines!

DIP

#4:

Was

for number of

rings

selector. Disabled in software, since

this

pin

is

now looking for

DC

voltage to answer, not

cycles

of AC

ring

voltage.

Telos

ONE

plus

ONE

-

SUPER

AUTO

ANSWER

BOARD

,

All other remote control functions (remote seize, remote drop, line

status,

auto status, auto on/off) remain the same. It

is

recommended that

the

key

phone handset be

OFF-HOOK

so

the key phone's buttons flash at the correct
rates. If the talent wants to release a line without taking another caller, he
can hit the hook switch to pop the button

up!

If

the phone must be

used

normally, the hybrid must be turned off manually. One way to do

this

is

to

rewire the disconnect button to function

as

the autoanswer board's DROP

signal.

(The disconnect button

is

an optional button on some key phones; it's

used

to disconnect a line without

having

to

pop

the button up.) If your phone

doesn't have the disconnect button already, add a momentary button across

pins

J7-2

&

J7-10

and mount it either on the phone or near the phone.

We

recommend turning on

DIP

#1

and then installing the board

in

your

unit. Of course, you

can

take advantage of the other options by connecting

some extra momentary switches and some

LED

indicators.

This

way the

operators can toggle between

AUTO

and

NO

AUTO,

turn the hybrid on and

off

manually and have indicators

of

the hybrids status

as

well. Refer to

this

manual's

OPERATION

section for a circuit you

can

build up that will do

this.

If

touchtones are needed to dial out and must

be

heard on the air, another

touchtone pad should be fed into the hybrids mix

-

minus scheme. The

touchtone pad in the key phone needs the

-48V

from the phone line to

operate,

so

it would need

its

own power supply. Another scheme could use

some

type

of relay circuit that would reconnect

ONLY

the touchtone pad in

the key phone

(NOT

the network!)

to

the line selected

ONLY

while dialing

.

We don't want the tone pad hanging on

the

line all

the

time, because it will

load down

the

line. Since the tone pad

is

also

powered from the phone line, it

will only

be

active while it

is

connected to the phone line through the relay.

Some stations

use

prerecorded carts

with

tones

on

them,

so,

for instance, the

mayor's

unlisted

home phone doesn't

go

out on the air!

"

SUPER" AUTO ANSWEWRELEASE ADDENDUM

#1

SOFIWARE

VERSION

AA

V3.1

This

version of

software

is

very similar to the

AA

V1.1

software, but

is

intended for use on the telephone system

of

France. Here are the major

differences:

1)

Ring

detection

is

based on the French

ringing

frequency

of

%Hz.

2)

Dial tone release has been changed to differentiate between the
various reorder tones applied on the French telephone network. First, the
French phones

use

only

a

MHz

tone (instead of the MHz + 35OHz

used

in

the

US).

More precisely, a steady MHz tone will not

turn

the unit off.

Rather, a

MHz

tone that

is

pulsed at a rate of

1/2

Hz flO%(the French

reorder tone) will

turn

the hybrid

off.

Moreover, a

MHz

tone that

is

on for

1.5

sec.

and off for 3.5

sec.

f1Ph

(another

type

of reorder tone)

will

turn

the

hybrid off,

as

well.

All

DIP

switch options are identical to

AA

V1.1.

as

well

as

all

the

I/O

signals on the 15-pin connector, including remote on/off /auto, their respective
indicator outputs, and the decoded

DTMF.

Telo~

ONE

PIUS

ONE

-

SUPER

AUTO

ANSWER

BOARD

.

"

SUPER" AUTO ANSWEWRELEASE ADDENDUM

#2a

(supercedes Addendum

2)

SOFTWARE

VERSION

V5.2

This

version of software

is

intended for use on the Italian telephone

system. The Italian phone

-

system

uses

a non-standard reorder tone

(425Hz)

that

is

pulsed at a rate

of

200

msec.

on/

200

msec.

off.

Ring

frequency

is

50

Hz.

HARDWARE CONSIDERATIONS: In order to recognize this tone the
hardware must

be

changed. First, the crystal frequency

is

changed to make

the call progress detector chip detect

=Hz.

Because of the short duration of

the tone, this chip has

a

difficult time detecting a valid tone.

So,

an

extra

op-amp section

is

added to the hardware to ensure a high enough level

is

presented to the chip's input. To avoid line release from music and other
sources the talk-off portion of the code

has

been modified to detect

four

consecutive tone sequences. Should the levels not

be

consistently high enough,

the unit may take more

than

four beeps to

turn

off. The DTMF decoder will

not operate at all because its reference frequency

has

been changed (to

accommodate the

call

progress detector chip).

SOFIWARE CONSIDERATIONS:

This

version of software can

be

used with

the Telos

DTMF-to-Rotary Dial converter board. When a DTMF tone

is

present on the

send

input of the hybrid,

the

converter board will hold the

hybrid's "on

"

pin low.

This

is

done

so

that the hybrids output

is

muted

during pulse

dialing.

Furthermore, the Super Auto-answer boards software

must not

try

to

tum

the hybrid off because of T/R reversal or loop drop, which

could happen during pulse

dialing.

(See

the schematic of the converter board

for details.)

This

software version addresses this problem by looking at the

"

on" pin while in the "off-hook mode and compensates for the pulse dialing

by adding a time

-

out period after the "~n" pin

has

been released. It then

goes

back to the current detectors to reset

its

"

when-to-tum-off sequence.

AA

V5.2

supports all DIP switch options (identical to

AA

V1.1.)

as

well

as

most all the 1/0 signals

on

the 15-pin connector, including remote

on/off/auto, and their respective indicator outputs. The decoded DTMF

outputs are disabled and should not

be

used.

Super Auto-answer Board

PARTS

u1-4

us

u7

U8

u9
UlO

RP 1

R

P2

R1

R2
R3

R4

R5,7

R6

R8,10,13,14
R9,ll

R12

R15,16,17

R18

R19,20
c1
C2,3,6,7,8

c4

c5
c9:
c10
c11

Dl

-

5

D6

D7,8,9

x1

LIST

Optoisolator 4N33

Call Prog Detect SS175T982-CP
DTMF Decoder SS175T204-IP
Octal open coll. driver ULN2003
Microprocessor 87C751-1 N24
Octal buffer

74LS244
10KR SIP 4306R-101-103
lOKR SIP 4310R-101-103

2.2KR 1/4W

5%

47KQ 1l4W

5%

100KR 1/4W

5%

910R 1/4W

5%

1.8KR 1/4W

5%

47R 114W

5%

1OKQ 1/4W

5%

1KR 1/4W

5%

8.2KQ 1/4W

5%

1

OOR

1/4W

5%

1

OMR

1 /4W

5%

1KQ 1/4W

5%

0.47pF mono

2.2pF tant. 9 25V

0.1pF mono

0.33pF tant. 925V
1O.OpF 025V

0.0022pF mono

1

.OpF 025V

diode

1

N4004

Zener diode 1N5246

signal diode 1 N4148

3.58MHz crystal

Descrmtnct

su5 22-pim socket (400mil)

su7 14-pin socket

su9 24-pin socket (300mil)
SU10 20-pin socket
sw1 4-position DIP

SW

..

SU1-4 6-pin socket

SU6 8

-

pin socket

SU8 16

-

pin socket

16

-

PIN

RT

ANGLE HEADER 0.1 " spacing

8

-

PIN FEMALE HEADER 0.1" spacing

4

-

PIN FEMALE HEADER 0.1" spacing

15

-

pin female FRC D-shell ass'y

NOTES

-

All sockets machined pin, selective gold

-MPU must be programmed; available from Telos.

Refer to text for software options.

Tebs

ONE

PIUS

ONE - SUPER AUTO

ANSWER

BOARD

c

.

t

Tutorial

ELECTRONIC PHONE

SYSTEMS

Tebs

ONE

plus

ONE

-

ELECTRONIC

PHONE

TUTORIAL

Electronic Phone Systems

This

tutorial introduction to electronic phone systems may be

helpful

if

you desire to

COM&

a Telos hybrid to such systems.

The cable from the phone

sets

to the "common equipment" must

convey:

Power to operate the phone

A

two-way data path

The speech audio path

The early electronic phones used a separate pair for each of the

three

functions, and thus required

six

wires. The AT&T Horizon

was an example of

this

approach. Another

is

the popular Merlin

system which

uses

four pairs.

The most common approach

used

in new designs

is

a two pair, four

-

wire scheme.

In

this

scheme, the talk and data are each balanced

and each use one of the

two

pairs. The power is "phantom

"
applied between the two pairs in a way similar to the method
used for phantom powering condenser microphones

in

recording

studios.

+v

to

power

phone

Audio in

~+~~&~~

I

I

Audio

to Set

*

*

Electronic Phone Scheme Using

Two

Pairs - Note fhat this diagram

shows

data

flow

in only one direction for simplicify.

A

transformer

is

generally used at each end of the audio pair

so

that the phantom power

may

be added. The data pair often

uses

resistors to obtain a "center tap" rather than transformers since the
data signal has

DC

components that would not pass through a

transformer.

Telos

ONEplUs ON€ - ELECTRONIC

PHONE

TUTORIAL

Usually, in the

two

pair approach, the center

two

wires on the

modular plug are the audio path.

To

Phone

Sel

To

Hybrid

One method for interfacing to some electronic phones. The
chokes

pass

the

DC

voltage to the phone set when the

hybrid

is

active.

The Mite1 "Superset" phones

use

a unique scheme that requires

only one pair for all

three

functions. How do they do it? The data

is

amplitude shift modulated onto a

32

kHz

camer "over voice

"

and then the combined voice and data are AC coupled across the

DC

power voltage.

The most advanced systems

use

a pure digital bit stream for both
voice and data. The phone set contains the CODEC for conversion
to and from the analog and digital domains. The pure digital
approach

is

used

in

the AT&T System

85

and the digital version of

the NEC NEAX

2400

as well

as

in the new Northern Telecom

Norstar system.

Since most electronic phone systems use an analog talk path, a
hybrid can be connected to the system by inserting it in the analog
path by breaking the connection from the phone switching
equipment to the instrument. Usually, the

talk

audio

is

found on

the center

two

wires of the line going to the phone. Looping

this

through the hybrid gets the audio connected.

The operator is responsible for turning the hybrid on and off upon
initiation of each call. The hybrid's on and off remote may be

Telos

ONE @us

ON€

-

ELECTRONIC

PHONE

TUTORIAL

.

connected to the console's on/off logic outputs to perform

this

,

function.

This

scheme works well for one-call-at-a-time situations

as

you would have in a newsroom or production studio or for

occasional on-air

use.

A

problem

remains,

however, when

calls

need to

be

taken one after

the other, as

in

a

talk show situation.

In

most

cases,

the hybrid

must be signalled each time

a'new'line

is

selected

so

that adaption

to the line can

occur.

It may be possible to derive an appropriate

pulse from the phone by

tacking-on an external circuit of some kind

which would trigger the hybrid's remote on/off function.
Remember too, the hybrid should

be

switched off or its input audio

removed when no line

is

active. Otherwise, the hybrid will
proceed to adjust itself to the high impedance presented to it and
may take a few seconds to recover from

this

condition when a call

is

subsequently taken.

Your

kindly phone supplier may

be

able to

help.

If

you have any luck along these lines, please let

us

know

so

that we can produce an application note for other

users.

With phone systems that have a digital talk path, the situation
with the

on/off control is as above with the additional

complication that you need to

find

a way to get at the converted-

teanalog

signal

inside the phone

set.

Perhaps some poking around

with

a scope or headphones may be

useful in

this

endeavor. Again, maybe your phone provider

company might help. Please let

us

know what you find!

A

universal way to obtain an audio signal from

any

phone

is

to

use

an

adapter which plugs into the handset jack. These should be
available from your local telephone supplier. If you have
problems finding an adapter locally, we may be able to help.

Telos

ONEplus

ONE

-

ELECTRONIC

PHONE

TUTORIAL