Page 4 National Communications
DOOR PHONE PERFORMANCE
This product is IDEAL for RESIDENTIAL USE or COMMERCIAL USE,
where ROAD NOISE is NOT HIGH. It is not designed for INDUSTRIAL
USE where ambient noise can be constantly high. A balance Speaker-
Microphone POT, accessed from the rear of the unit may need to be
adjustedtoachievebestperformance.
The volume of the audio communication on the internal phones
should be comfortably audible (although not quite as loud as a
telephone call) providing :
•ThepersonattheDoorPhone istalkingdirectlytowardstheDoor
Phone and at a distance of no more than 1 to 2 feet away (max 500-
600 mm).
•TheDoorPhoneismountedataheightofabout1.5meters(5feet).
You can mount at a lower level to allow for very young children, but
volume will suffer. Please see page 8 for
•No plates or other material are placed over the front face of the
Door phone. Our Door Phone Cover accessory, or a properly
designedRainHood will notaffectperformance.
The volume of the audio communication at the Door Phone should
be comfortably audible, providing :
•There is not excessive road noise or other noise near the Door
Phone.This will affect the automaticgain circuit used in thisdevice.
•That high quality ADSL FILTERING is fitted ahead of the DS
CONTROLLERwhereADSLisusedonthesameline.Ifyoudonotdo
so, volume in both directions will be affected. Refer to your Door
Station Controller User Guide for detailed information on the use of
ADSL with this product.
Note - This device uses a 2 Wire Intercom Design. Improved
VOLUME and CLARITY is provided with our 4 Wire DP2,DP3, DP4
and DP5 Door Phone designs, which can be used if necessary as
a direct plug in replacement.