Nat PTA12-000 User manual

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
SM55
PTA12-000
POTS Telephone Adapter
Manual
INSTALLATION AND OPERATION MANUAL
REV 4.00 November 12, 2003
Northern Airborne Technology Ltd.
1925 Kirschner Road
Kelowna BC, Canada
V1Y 4N7
Telephone [phone]
Facsimile [phone]
Copyright 2003 by Northern Airborne Technology

SM55 Rev 4.00 PTA12-000 POTS Telephone Adapter Manual
Nov 12, 2003 Page ii
ENG-FORM: 820-0109.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Periodically NAT will release manual amendments. In order to maintain the most
accurate and up to date manual these amendments should be carried out immediately
upon receipt and recorded on the following amendment record.
AMENDMENT RECORD
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SM55 Rev 4.00 PTA12-000 POTS Telephone Adapter Manual
Nov 12, 2003 Page iii
ENG-FORM: 820-0109.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Table of Contents
Section Title Page
1.0 Description
1.1 Introduction 1-1
1.2 Purpose of Equipment 1-1
1.3 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
1.5 Accessories Required But Not Supplied 1-4
2.0 Installation
2.1 Introduction 2-1
2.2 Unpacking and Inspection 2-1
2.3 Installation Procedures 2-1
2.3.1 Warnings 2-1
2.3.2 Cautions 2-1
2.3.3 Cabling and Wiring 2-2
2.3.4 Internal Adjustments 2-2
2.3.5 Post-Installation Checks 2-3
2.4 Continued Airworthiness 2-3
2.5 Installation Drawings 2-4
3.0 Operation
3.1 Introduction 3-1
3.2 General 3-1
3.3 Operation Specifics 3-1
3.3.1 Keypad Controls 3-1

SM55 Rev. 4.00 PTA12-000 POTS Telephone Adapter Manual
Section 1.0 Description
1.1 Introduction
This manual contains information on the PTA12 POTS Telephone Adapter.
Information in this section consists of purpose of equipment, features and specifications.
1.2 Purpose of Equipment
The PTA12 POTS Telephone Adapter is a keypad control/headset adapter unit for
airborne telephone system applications. The PTA12 connects to a telephone system
transceiver by a two-wire POTS (Plain Old Telephone Service) interface. The PTA12 can
be connected to the aircraft audio controller(s) or directly to an aviation headset/handset.
1.3 Features
The PTA12 POTS Telephone Adapter is compact Dzus mounted POTS telephone
interface with a keypad input. The functions of the PTA12 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 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 nominal (with reverse & over voltage/current
protection)
Minimum +22.0 Vdc.
maximum +30.3 Vdc.
emergency +18.0 Vdc
Nov 12, 2003 Page 1-1
ENG-FORM: 800-0106.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

PTA12-000 POTS Telephone Adapter Manual SM55 Rev. 4.00
Input Current 0.25 Amps max @ +27.5 Vdc.
Backlighting 1.0 mA max @ +27.5 Vdc.
0.1 mA max @ +5.0 Vdc.
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 (typ), 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
Page 1-2 Nov 12, 2003
ENG-FORM: 800-0106.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

SM55 Rev. 4.00 PTA12-000 POTS Telephone Adapter Manual
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
Freq. Response: ≤3 dB roll-off from 350 to 3000 Hz
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,
Mic level potentiometer set to max
RX Audio: Typical expected audio level: 77.5 to 775 mVrms
(-20 to 0 dBm)
DTMF signaling: Standard DTMF frequencies used: 0 - 9, ✱, #
Frequency tolerance: ±1.5 %
DTMF TX on tip/ring (DTMF level potentiometer set to max.):
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).
Miscellaneous
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).
Nov 12, 2003 Page 1-3
ENG-FORM: 800-0106.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

PTA12-000 POTS Telephone Adapter Manual SM55 Rev. 4.00
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
1.4.3 Environmental Specifications
Operating Temperatures -20°C to +55°C
Survival Temperatures -55°C to +85°C
Vibration/Shock DO-160D Cat. [(SBM)(UF)]
Humidity > 95%
Altitude 50,000 ft.
Compliance:
DO-160D Env. Cat. A1/D1-BAB[(SBM)(UF)]XXXXXXZBABB[UTX]MXXXX.
1.5 Accessories Required But Not Supplied
Installation kit p/n PTA12-IKC (crimp) or PTA12-IKS (solder) is required to complete the
installation. They consist of the following:
PTA12-IKC 25-pin D-min Female Crimp Kit (NAT Part No. D25SV-IKC)
Quantity Description NAT Part #
1 D-min 25 Socket housing 20-21-025
25 MS Crimp Socket 20-26-901
1 25 Pin JVL Hood/Locklever 20-29-250
PTA12-IKS 25-pin D-min Female Solder Kit (NAT Part No. D25SV-IKS)
Quantity Description NAT Part #
1 D-min 25 Socket Solder Cup 20-20-025
1 25 Pin JVL Hood/Locklever 20-29-250
End of section 1.0
Page 1-4 Nov 12, 2003
ENG-FORM: 800-0106.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

SM55 Rev. 4.00 PTA12-000 POTS Telephone Adapter Manual
Section 2.0 Installation
2.1 Introduction
Information in this section consists of: unpacking and inspection procedures, installation
procedures, post-installation checks, and installation drawings.
2.2 Unpacking and Inspection
Unpack the equipment carefully and locate the warranty card. Inspect the unit visually
for damage due to shipping and report all such claims immediately to the carrier
involved. Note that each unit should have the following:
- PTA12 POTS Telephone Adapter
- Warranty Card
- Operator’s Manual
- Release certification
Verify that all items are present before proceeding and report any shortage immediately
to your supplier.
Complete the warranty card information and send it to NAT when the installation is
complete. If you fail to complete the warranty card, the warranty will be activated on
date of shipment from NAT.
2.3 Installation Procedures
2.3.1 Warnings
Do not bundle any lines from this unit with transmitter coax lines. Do not bundle any
audio or DC power lines from this unit with 400 Hz synchro wiring or AC power lines. Do
not position this unit or wiring from this unit next to any device with a strong alternating
magnetic field such as an inverter, or significant audio interference will result.
2.3.2 Cautions
⇒ In all installations, use shielded cable exactly as shown and ground as indicated.
Significant ground loop and noise problems may result from not following these
guidelines. Ensure chassis is grounded to provide proper shield terminations.
⇒ Use caution when routing microphone wiring, as it is a low level signal prone to
coupling from other sources.
⇒ Do not take a ground from the instrument panel or similar location that shares a ground
return with a turn and bank, horizon or other motor driven instrument. This may cause
the PTA12 unit to pick up the sound of the motor as ground loop interference.
Nov 12, 2003 Page 2-1
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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

PTA12-000 POTS Telephone Adapter Manual SM55 Rev. 4.00
2.3.3 Cabling and Wiring
All unshielded wire should be MIL-W-22759 or equivalent. For shielded wire
applications, use Tefzel MIL-C-27500 shielded wire with solder sleeves (for shield
terminations) to make the most compact and easily terminated interconnect. Follow the
wiring diagrams in Section 2.5 as required.
Allow 3 inches from the end of the wire to the shield termination to allow the hood to be
easily installed. Note that the hood is a ‘clamshell’ hood, and is installed after the wiring
is complete.
All wiring should be at least 22 AWG, except power and ground lines, which should be
at least 20 AWG. Ensure that all ground connections are clean and well secured.
2.3.4 Internal Adjustments
The following adjustments are accessible through holes in the side of the unit.
2.3.4.1 Internal Trimpots
Rotating the trimpots cw will increase the level of the related
output, and ccw will decrease it.
LTS adjusts keypad backlighting level from off to max
DTMF adjusts DTMF level on POTS interface
S/T adjusts sidetone level
RX adjusts receive level on phones output
MIC adjusts mic level on POTS interface
RGR adjusts ringer level on both ringer audio and
phones output
2.3.4.2 Internal Switches
RGR (ringer select) on [down] ringer audio available on both
phones and ringer audio outputs
off [up] ringer audio only available on
ringer audio output
*FL B (hook flash) on [down] flash = 600 ms ±10% * One of FL A or FL B
must be selected ‘on’
for proper hook
switch operation
off [up] 600ms hook flash disabled
*FL A (hook flash) on [down] flash = 90 ms ±10%
off [up] 90ms hook flash disabled
MIC (mic bias) on [down] mic bias supplied by PTA12
off [up] mic bias not supplied
Page 2-2 Nov 12, 2003
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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

SM55 Rev. 4.00 PTA12-000 POTS Telephone Adapter Manual
2.3.5 Post-Installation Checks
2.3.5.1 Voltage/resistance checks
Do not attach the PTA12-000 until the following conditions are met.
Check the following:
a) Check P101, pins <1> and <3> for +28 Vdc relative to ground.
b) Check P101, pins <14> and <16> for continuity to ground (less than 0.5 Ω).
2.3.9.2 Power On checks
Install the PTA12 and power up the ship’s systems. Verify normal operation of all
functions. Refer to Section 3 for specific operation details.
Notes: PTA12 functionality is highly dependant on the airborne telephone system
interface. Ensure proper operation of the telephone transceiver, and ensure
that the transceiver has an activated telephone line.
Where the PTA12 is connected to an existing audio system, ensure that the
PTA12 is properly selected when performing audio checks.
a) Initiate a call to a valid telephone number and verify the operation for HOOK,
HOLD, DTMF keys (0-9, ¿, #), and VOL. Re-initiate the call using REDIAL.
Test the FLASH function (where applicable) while in the off-hook state (active).
b) Place the PTA12 in the on-hook (inactive) state, and have another party call the
line connected to the PTA12. Verify proper RINGER, HOOK and HOLD
operation.
Note: To verify proper operation, all functions and levels should be checked in-flight.
Upon satisfactory completion of all performance checks, make the required log
entries and complete the necessary Regulatory Agency paperwork before
releasing the aircraft for service.
2.4 Continued Airworthiness
Maintenance of the PTA12 is ‘on condition’ only. Periodic maintenance of this product is
not required.
Nov 12, 2003 Page 2-3
ENG-FORM: 805-0106.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

PTA12-000 POTS Telephone Adapter Manual SM55 Rev. 4.00
2.5 Installation Drawings
DRAWING REV. DESCRIPTION TYPE
PTA12\000\403-0 1.03 POTS Telephone Adapter Interconnect
PTA12\000\405-0 1.01 POTS Telephone Adapter Connector Map
PTA12\000\905-0 1.00 POTS Telephone Adapter Faceplate
PTA12\000\922-0 1.00 POTS Telephone Adapter Mech. Installation
Section 2.0 ends after these Drawings
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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.