Nat PTA12-100, Installation And Operation Manual

Page: 20 / 52

PTA12-100 POTS Telephone Adapter with Display Manual SM55 Rev.4.00
Page 2-2 Sep 21, 2004
ENG-FORM: 805-0107.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
2.3.3 Cabling and Wiring
All unshielded wire shall be selected in accordance with AC43.13-1B Change 1,
Paragraphs 11-76 through 11-78. Wire types should be to MIL-W-22759 as specified in
AC43.13-1B Change 1, Paragraphs 11-85, 11-86, and listed in Table 11-11. 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 2.6 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 min 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
FLA / FLB select FLA flash = 90 ms
±
40 ms
(
hook flash
) select FLB flash = 600 ms
±
100 ms
MIC (mic bias) on [down] mic bias supplied by PTA12
off [up] mic bias not supplied