Northern Airborne Technology PTA12-0xx User Manual

Installation and Operation Manual

PTA12-000

POTS Telephone Adapter

SM55-1

ISSUE 4.02

Northern Airborne Technology Ltd.

1925 Kirschner Road

Kelowna, BC, Canada.

V1Y 4N7

Telephone [phone]

Facsimile [phone]

Issued on the authority of Northern Airborne Technology Ltd.

Copyright 2003

PTA12-000 POTS Telephone Adapter

SM55-1 Installation and Operation Manual

Table of Contents

Section Title Page

1. Description

1.1 Introduction 1-1

1.2 Product Description 1-1

1.3 Design Features 1-1

1.4 Specifications 1-1

1.4.1 Electrical Specifications 1-1

1.4.2 Physical Specifications 1-3

1.4.3 Environmental Specifications 1-4

2. Installation

2.1 Introduction 2-1

2.2 Unpacking and Inspection 2-1

2.2.1 Warranty 2-1

2.3 Continued Airworthiness 2-1

2.4 Installation Procedures 2-1

2.4.1 Warnings 2-2

2.4.2 Cautions 2-2

2.4.3 Cabling and Wiring 2-2

2.4.4 Post-Installation Checks 2-3

2.5 Adjustments and Connections 2-4

2.6 Accessories Required But Not Supplied 2-5

2.7 Installation Drawings 2-5

3. Operation

3.1 Introduction 3-1

3.2 General Information 3-1

3.2 General Information 3-1

3.3 Controls and Indicators 3-1

3.3.1 Keypad Controls 3-1

Installation and Operation Manual Page iii

ENG-FORM: 820-0115.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

PTA12-000 POTS Telephone Adapter

SM55-1 Installation and Operation Manual

Section 1 Description

1.1 Introduction

Information in this section consists of product description, design features and specifications for the
PTA12-000 POTS Telephone Adapter. All derivative product information shall be contained in the
applicable manual supplement, which may be obtained from Northern Airborne Technology Ltd. as
required.

Review all notes, warnings and cautions.

1.2 Product Description

The PTA12-000 POTS Telephone Adapter is a keypad control/headset adapter unit for airborne
telephone system applications. The PTA12-000 connects to a telephone system transceiver by a two-wire
POTS (Plain Old Telephone Service) interface. The PTA12-000 can be connected to the aircraft audio
controller(s) or directly to an aviation headset/handset.

1.3 Design Features

The PTA12-000 POTS Telephone Adapter is compact Dzus mounted POTS telephone interface with a
keypad input. The functions of the PTA12-000 include ring detect, ringer audio generate, DTMF tone
generation, speech audio circuits, hook-switch, and flash. The speech circuits include a mic input
amplifier and a phones output amplifier with front panel volume control. HOOK-switch control and
indication is provided on the front. Ring indication is also provided on the front panel with a flashing green
LED. A FLASH key is provided on the front panel for use with call transfer and call waiting. A HOLD key
on the front panel mutes all audio to and from the headset. A REDIAL key on the front panel automatically
redials the last number entered. The interface to the airborne telephone system transceiver is achieved
by a two-wire POTS port. The front panel keypad is illuminated for night operations.

Note: The PTA12-000 is designed to meet standard North American PSTN requirements, but it is not

recommended or approved for land line applications.

1.4 Specifications

1.4.1 Electrical Specifications Power Supply

Voltage: Normal +27.5 Vdc nom (with reverse & over voltage/current protection)
Minimum +22.0 Vdc

Maximum +30.3 Vdc

Emergency +18.0 Vdc
Input Current 0.30 Amps max @ +27.5 Vdc.
Backlighting 1.0 mA max @ +27.5 Vdc

0.1 mA max @ +5.0 Vdc

Section 1 Rev: 1.00 Issue 4 Page 1-1

ENG-FORM: 800-0115.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.

PTA12-000 POTS Telephone Adapter

SM55-1 Installation and Operation Manual

Input Signals

Microphone 150 Ohm amplified dynamic.
250 mVrms rated input level.
Impedance: 150 Ohm ±10%

Circuitry Type Single Ended.
Mic bias +13 ±0.5 Vdc (on/off selectable externally)

Output Signals

Phones Rated level: 100 mW into 600 or 150 Ohms
Circuitry Type: Differential
Freq. Resp: ≤3 dB roll-off from 350 to 3000 Hz
Distortion: ≤5% THD @ rated power output
Audio Noise (no signal): ≤ -50 dB from rated output
Available Audio: RX audio, Sidetone, DTMF sidetone
Ringing tone: enabled or disabled externally

Ringer Audio Ringer audio present based on ringing cadence
Level: 2.5 Vrms (typical), 3.6 Vrms (max) into 600 Ohms
Circuitry Type: Single Ended

Ringer Drive Pulled to Power Ground when ringer is active (based on ringing

cadence).
Open collector, 250 mA max sink current @ +28 Vdc.
Over-current and over-voltage protected.

Input / Output Signals

POTS (2 wire) Reverse polarity protected and current limited.

On-hook Condition DC voltage: withstands ±70 Vdc max.

Resistance: 10 to 15 MOhms.
Ringing Condition: Impedance 10 to 15 kOhms @ 25 Hz

Active when ringing signal on tip/ring >30 Vrms @ 25 Hz
Inactive when ringing signal on tip/ring <10 Vrms @ 25 Hz

Ringing Functions Accepts square, trapezoidal or sinusoidal functions
Withstands 120 Vrms (max) 25 Hz sinusoidal function

Off-hook Condition:

Impedance: 600 Ohms ±5% @ 1kHz
Circuitry Type: Balanced
DC loop current: 25 mA (typical) to 120 mA (max)
DC voltage: ≤9.0 Vdc @ 25mA loop current

Frequency Response: ≤3 dB roll-off from 350 to 3000 Hz

Section 1 Rev: 1.00 Issue 4 Page 1-2

ENG-FORM: 800-0115.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.

Distortion: ≤5% THD
Audio Noise: ≤ -50 dB from rated output (no signal)
Available Audio: TX Audio, RX Audio.
TX Audio: Mic Input to tip/ring: 775 mVrms (0 dBm) with <5% THD
Test condition: 170 mVrms @ 1 kHz into Mic input,

RX Audio: Typical expected audio level: 77.5
DTMF signalling: Standard DTMF frequencies used: 0 - 9, ½, #

Frequency tolerance: ±1.5 %
DTMF TX on tip/ring (DTMF level potentiometer set to max.):

Miscellaneous

PTA12-000 POTS Telephone Adapter

SM55-1 Installation and Operation Manual

Mic level potentiometer set to max

to

775 mVrms (-20 to 0 dBm)

High group -2.2 dBm ±1.0 dB

-2.2 dBm ±2.5 dB (short time high operating temperature).
Low group -4.2 dBm ±1.0 dB

-4.2 dBm ±2.5 dB (short time high operating temperature).

HOLD TX mic muting: ≤ -60 dB from rated output
RX phones muting: ≤ -85 dB from rated output
Sidetone muting: ≤ -90 dB from rated output

REDIAL Typical tone duration: 82 ±8 ms
Typical inter-digit pause time: 82 ±8 ms

VOL Dynamic range: 40 ±3dB

1.4.2 Physical Specifications

Height 1.12" (28.4 mm)
Width 5.75" (146.1 mm) in front of panel

4.80" (121.9 mm) behind panel
Depth 4.17" (105.9 mm) behind panel, including connector
Weight 0.63 lbs. (0.29 kg).
Front Panel Aluminum, with Lexan label and Elastomeric keypad. Front panel

is not backlit. Silicone rubber, tactile push-buttons backlit by

amber LEDs

Mounting Dzus rail (4 fasteners).
Material/Finish Chassis & cover are 5052-H32 brushed aluminum with chromate

conversion finish

Connectors One male filtered 25 pin D-min with Positronics V5 locking tabs

Section 1 Rev: 1.00 Issue 4 Page 1-3

ENG-FORM: 800-0115.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.