Asl intercom PS 150 User Manual

PRO SERIES

USER MANUAL

FOR THE

PS 150

SINGLE CHANNEL TELEPHONE INTERFACE

CONTENTS

1.0 GENERAL DESCRIPTION ...................... 3

2.0 UNPACKING ................................. 3

3.0 INSTALLATION ............................... 3

4.0 FRONT PANEL CONTROLS ..................... 4

5.0 REAR PANEL CONNECTORS ................... 5

6.0 CABLING .................................... 6

7.0 PARTY LINE, TECHNICAL CONCEPT ............. 7

8.0 GUARANTEE ................................. 7

9.0 TECHNICAL SPECIFICATIONS .................. 7

User Manual PS 150 / Issue 1 © 1994 ASL Intercom, Utrecht, Holland.

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User Manual PS 150 / Issue 1 © 1994 ASL Intercom, Utrecht, Holland.

1.0 GENERAL DESCRIPTION

The PS 150 is designed to interface the ASL intercom The PS 150 is a combination of two interfaces.
system (3-wire, party line) to the telephone system One for interfacing the intercom line to a separate input
(2-wire). and output, and one for interfacing the telephone line to a
For example communication can be realised between a separate input and output.
normal telephone and one or more ASL stations, or These inputs and outputs are internally (cross-) connected.
between two ASL systems via a telephone-line.

The two-stage sidetone circuit (level, hi) allows you to
The PS 150 is a sub-station and receives power from the obtain an input/output separation better than 30 dB from
intercom line. 20Hz to 20KHz.

The built in testtone generator helps you to adjust or check

the sidetone level at any time.

2.0 UNPACKING

The shipping carton contains the parts listed below
* The PS 150
* Set of telephone cables
* User manual
If any are missing, contact your dealer.

ASL has taken great care to ensure this product reaches
you in flawless condition.

After unpacking the unit please inspect for any physical
damage to the unit, and retain the shipping carton and
relevant packing materials for use should the unit need
returning.

If any damage has occurred, please notify your dealer so
that a written claim can be initiated. Please also refer to the
guarantee section of this manual.

3.0 MECHANICAL INSTALLATION

The PS 150 will interface between ASL partyline (3-wire If your telephone system does not use the FCC type
intercom) and 2-wire telephone systems. connectors we have applied on the PS 150 you can use

these extra cables for interconnecting.
To connect the PS 150 with ASL partyline system, use
professional flexible microphone cable with 2 wires and 1 Connection procedure :
shield only. Connect the partyline system cable into the 1. Lift the covers of the telephone line connector and the
intercom line connector on the rear. telephone plug, which your system applies.
To connect the PS 150 with the 2-wire telephone system,
use the telephone cable to the FCC type connector on the 2. Use their connection screws for attaching the four
rear. leads coming from each cable following these colour

assignments:
There are no separate power connections to install since yellow EB
the necessary DC voltages are derived from the ASL green b
partyline. red a

black ground
The PS 150 is fully protected against mis-wiring (reverse
power) or short circuit in the interconnecting cables. 3. Put the covers back in place.

User Manual PS 150 / Issue 1 © 1994 ASL Intercom, Utrecht, Holland.

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4.0 FRONT PANEL CONTROLS

The PS 150 is a combination of two interfaces. The telephone line sidetone rejection may be rather poor
One for interfacing the intercomline to a separate input and compared to the intercomline sidetone rejection because
output, and one for interfacing the telephone line to a of the complex impedance of the telephone line.
separate input and output.
These inputs and outputs are internally cross connected. Because the PS 150 combines two interfaces, a decrease

of sidetone rejection in all intercom stations connected to
Both interfaces have their own sidetone trimmers. the same channel as the PS 150 might occur.
The two sidetone trimmers at the left side of the front panel
control the internal input/output separation of the intercom If speaker stations are connected, internal feedback may
line interface. occur.
The sidetone trimmer in the right of the front panel controls If this problem arises, it can be solved by keeping the send
the internal input/output separation of the telephone line and receive levels of the PS 150 low and by turning the
interface. speaker attenuator trimmers of the howling speaker
For prevention of internal feedback or a 'hollow sound' in station(s) anti clockwise.
both systems all sidetone trimmers must be adjusted care­fully.

1 SIDETONE LEVEL trimmer (INTERCOM LINE) SIDETONE ADJUSTMENT PROCEDURE

This trimmer controls the internal input/output - plug a headset in the test headset connector.
separation of the intercom line interface. - set receive level to minimum.
It also compensates the resistance of the set send level to maximum.
interconnecting cables. - set intercom line sidetone trimmers in start position :
For sidetone adjustment procedure see 4.4. level : turn fully clockwise.

hi : turn fully anti-clockwise.

2 SIDETONE HI trimmer

This trimmer controls the internal input/output - decrease testtone level by turning the level trimmer
separation in the high-frequency range. anti-clockwise.
It compensates the capacity of the interconnecting adjust for minimum level.
cables. - decrease the remaining high-frequencies by turning the

3 SIDETONE TEST knob

This hidden pushbutton switch activates a testtone obtained the best possible settings.
generator which adds a 200Hz tone to the internal - set telephone line sidetone trimmer in start position:
input signal of the intercom line interface. turn level trimmer fully clockwise.
It allows you to adjust or check the sidetone trimmer - connect an ASL sub-station (beltpack, speaker station)
settings of the intercom line interface. to the intercom channel and adjust its sidetone for

Note: Make sure you are not disturbing any - connect the PS 150 to the telephone line and make
communication because the test-tone is placed on the connection with the front panel connect switch.
intercomline which implies that all stations on that - Turn up receive level slowly while speaking into the
channel can hear the test tone. headset mike. The volume of your voice will increase.

4 SIDETONE LEVEL trimmer (TELEPHONE LINE)

This trimmer controls the internal input/output
separation of the telephone line interface.

- activate the testtone generator.

hi trimmer clockwise.

- repeat the last three steps until you are sure you have

minimal level.

- Turn telephone line sidetone level trimmer anti­clockwise and adjust for minimum level.

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User Manual PS 150 / Issue 1 © 1994 ASL Intercom, Utrecht, Holland.