Sky Connect DO-160 - Installation Instructions; 2.3.1.2 Inputs And Outputs

1616-920-03
8/28/2014
Rev: B
2
2.3 INSTALLATIONINSTRUCTIONS

MMUIIisdesignedtobeinstalledinacockpitenvironmentsecuredtoDzusrails.A
suitablelocationshouldbefoundthatwillprovideenoughdepthinthepanelforthe
unitplustheconnectorswithamblebendradiusforthewiringharness.Failureto
dosomaydamagetheharnessandcauseamalfunctionofthesystem.

2.3.1 ELECTRICALINSTALLATION

Followtheinstallationdrawingintheappendixofthismanualasarecommended
methodtointerfacingtheMMUIItoaPOTSorRS‐232connection.Completelyread
thenotesprovided.

2.3.1.1POTSWIRING

Thisisa600Ohmtip/ringSubscriberLineInterfaceCircuit.

Theringingvoltageandcurrentisdependedonthenumberofringerloads.
ThePOTSspecusedcallsfor;

Theringingsignalisgeneratedbyswitchingthetransceiverintoringing
mode.Ringingvoltageofapproximately65Vrmsisappliedtoasingle
handset.DuringringingtheintegralDC/DCconverterautomatically
switchestoproduceabatteryvoltageof‐72V.Thiswillproducegreaterthan
40Vrmsintoaringloadof3.Theringingwaveformissetinternallytogive
thecorrectwaveformwith20Hzto25Hzringingfrequency.

Soringingisprovidedbyourtransceiverata20Hzcadenceandaring
voltageofgreaterthan40Vrmswith3ringerloads.

2.3.1.2InputsandOutputs

2.3.1.2.1 Outputs
Fourdiscretelampoutputsdesignedtoilluminatethelampsusedfor
IncomingMessageandthePhonelamps.Twonotusedatthistime.Phone
audiooutputat500Ωimpedancethatprovidesnominal5.0VACRMSaudioto
theheadsetsoraudiopanel.

2.3.1.2.2 Inputs
Microphoneaudioat150Ωimpedance.4VACthatconnectstotheheadsetsor
audiopanel.