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Connecting Qt PRO’s

overview of telephony interfaces

Introduction

It does not matter whether your

PBX supports analog or digital telephones, or whether you

have replaced the PBX with a VoIP gateway -

all of these devices

connection to a paging amplifier and/or

analog telephony

controller provides interworking between a tel

ephony system

include such functions. A paging controller

may be

controllers offer several additional features

including

alert tones, etc.

This paper explains how to connect

either directly utilizing a paging port of a

PBX or

connected to a telephony port of a

PBX or VoIP gateway

The primary mission of a sound-

masking system is to deliver masking sound uniformly throughout an office space. But

Sound Management’s ceiling-mounted

sound masking

(paging). To accommodate paging, every Qt

PRO control module

described as “U.S pro line-level, dry, always-on

aux

U.S. PRO Line Level

The meaning of the term “line level”

varies depending on whether the equipment is designed for use in a professional application or

a consumer application, and whether the equipment is designed for use in the United States, Germany, or elsewhere. Qt PRO’s

paging inputs are designed to handle

U.S professional line level signals. The specification for a

signal

is: +4 dBu, 1.228 (Vrms), 1.737 (Vpk).

But because of

paging inputs, Qt PRO is also tolerant of

signals that run “stronger”

amplifier that is capable of amplifying

an incoming signal by

incoming signal by 6 dB, or more,

for signals running

U.S. pro audio line levels

. Qt PRO’s input sensitivity controls are used to set the

Dry

“Dry” emphasizes that Qt PRO’s paging

inputs are not telephone interfaces and must never see dial tone, ringing voltage, battery

current, etc.

Always On

It is best to think of Qt PRO’s paging inputs as the Aux Audio inputs of an audio amplifier because Qt PRO

amplifier. On most audio amplifiers

, only one input is active at a time

paging inputs are always active

and play out on all masking zones

In a paging application, Qt PRO is always the called party but it is not capable of participating in the connection

its audio inputs are “always on”,

there is no need to establish a connection to QT

To understand what is meant by “establish a

connection

picks up

a telephone’s handset, a circuit is closed causing current to flow (loop start) in the wire loop between the telephone and th

serving switch or PBX. The switch

senses this flow of current and responds by placing a dial tone on the line and listening for d

digits. The calling party enters a

telephone number.

remainder of the telephone number.

Once it has received the telephone number it initiates

Paging A and Paging B i

nput impedance is 40,000 ohms, minimum.

Paging Inp

uts to the Corporate Telephone S

overview of telephony interfaces

may be found at

http://www.patton.com/technotes/fxs_fxo.pdf

PBX supports analog or digital telephones, or whether you

have moved to

all of these devices

typically offer one or more

paging output

analog telephony

ports that can be used to connect to

a paging controller. A paging

ephony system

and a paging amplifier

for use with telephony systems that do not

may be

needed even when

the telephony system provides a paging port as

including

: multiple individually addressable paging ports, all

This paper explains how to connect

a paging input of a

QT PRO control module to the corporate telephone

PBX or

VoIP gateway, or indirectly utilizing a paging port

of a paging controlle

PBX or VoIP gateway

. It also explains several ways to implement all-

masking system is to deliver masking sound uniformly throughout an office space. But

sound masking

emitters (speakers) are also effective at

delivering human voic

PRO control module

comes with

two paging inputs. These pagi

aux

audio inputs”.

varies depending on whether the equipment is designed for use in a professional application or

a consumer application, and whether the equipment is designed for use in the United States, Germany, or elsewhere. Qt PRO’s

U.S professional line level signals. The specification for a

Nominal U.S. pro audio line level

But because of

spotty adherence to this standard in

systems that drive QT PRO’s

signals that run “stronger”

and

“weaker” than this standard. Qt PRO contains a

an incoming signal by

6 dB, or more, for signals running “too

weak

for signals running

“too strong”.

This allows Qt PRO to handle signals that are

. Qt PRO’s input sensitivity controls are used to set the

paging pre-amplifier.

inputs are not telephone interfaces and must never see dial tone, ringing voltage, battery

It is best to think of Qt PRO’s paging inputs as the Aux Audio inputs of an audio amplifier because Qt PRO

, only one input is active at a time

(Aux A, Aux B, Tape, CD, Phono).

Qt PRO is a bit different. Both

and play out on all masking zones

where their respective levels

are set to a value other the MUTE

In a paging application, Qt PRO is always the called party but it is not capable of participating in the connection

there is no need to establish a connection to QT

PRO to affect a page.

connection

” let us take a simplified look

a typical telephone

a telephone’s handset, a circuit is closed causing current to flow (loop start) in the wire loop between the telephone and th

senses this flow of current and responds by placing a dial tone on the line and listening for d

telephone number.

The switch removes dial tone once it sees

the first dialed digit

Once it has received the telephone number it initiates

a series of complex operations

nput impedance is 40,000 ohms, minimum.

uts to the Corporate Telephone S

ystem

http://www.patton.com/technotes/fxs_fxo.pdf

have moved to

Voice over IP (VoIP) and

paging output

ports for direct

a paging controller. A paging

for use with telephony systems that do not

the telephony system provides a paging port as

paging

call, paging groups, music,

QT PRO control module to the corporate telephone

network,

of a paging controlle

r that is

ll paging.

masking system is to deliver masking sound uniformly throughout an office space. But

Cambridge

delivering human voic

e sound

two paging inputs. These pagi

ng inputs are best

varies depending on whether the equipment is designed for use in a professional application or

a consumer application, and whether the equipment is designed for use in the United States, Germany, or elsewhere. Qt PRO’s

Nominal U.S. pro audio line level

systems that drive QT PRO’s

“weaker” than this standard. Qt PRO contains a

paging pre-

weak

” and attenuating an

This allows Qt PRO to handle signals that are

from ½ to 2 times

inputs are not telephone interfaces and must never see dial tone, ringing voltage, battery

It is best to think of Qt PRO’s paging inputs as the Aux Audio inputs of an audio amplifier because Qt PRO

is an audio processor and

Qt PRO is a bit different. Both

are set to a value other the MUTE

In a paging application, Qt PRO is always the called party but it is not capable of participating in the connection

procedure. But since

a typical telephone

connection. When one

a telephone’s handset, a circuit is closed causing current to flow (loop start) in the wire loop between the telephone and th

senses this flow of current and responds by placing a dial tone on the line and listening for d

ialed

the first dialed digit

and listens for the

a series of complex operations

1 2 3 4

Inhaltsverzeichnis

Seite 1 - Paging A and Paging B i

Connecting Qt PRO’s TM An overview of telephony interfaces Introduction It does not matter whether your PBX supports analog or digital telephones, o

Seite 2

contact the switch serving the called party (both parties could be served by thechecking to see if the called party’s phone is on-ring. If the called

Seite 3

In all of these scenarios the termination of the connection procedure and translation to dry line level audio takes place in VoIP gateway or paging c

Seite 4

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