Door Phones; Door Lock Release - NEC Xen alpha Installation Manual

Door Phones

Switches SW1, SW2 and RV1 allow the volume levels between the doorphone units
and the KSU to be adjusted. Adjust these switches as required to achieve optimal door
phone performance. (Refer to Table 2-2: DPH-B13 ETU Switch Settings, Pg 71.)
Volume Adjustment:
Telephone to
Doorphone
Volume Adjustment:
Telephone to
Doorphone
Balance Adjustment:
Between DP1 & DP2
When the Door Phone button is pressed, one of two tones is produced at the assigned
telephones (ports 01 and 02 as default).
Connections
Wiring to each Door Phone requires a single-pair cable, to a maximum Loop
Resistance of 20 Ω. Connections DPH1 and DPH2 are not polarity sensitive.

Door Lock Release

While on a Door Phone call, the telephone user can enter an Access Code to operate
the associated Door Lock Release momentarily so that the caller can enter the door.
Connections
Connection between terminals DPR1, DPR2 and the door lock device is via a single
pair cable, not polarity sensitive. A dry contact closure is provided to the
external device.
Connection of door lock release equipment must be via a Line Isolation Unit with a
Telecommunications compliance label. The Batesford Electronics Model BE-104 is
an example.
Installation Manual, Chapter 2 – KSU Installation
November 2003, A6-506000-642-01(8508), Release 6.0
Table 2-2:
Function Reference
SW1
SW2
RV1
DPH-B13 ETU Switch Settings
Default
This adjustment effects DP1 & DP2.
NORMAL
NORMAL: Normal Volume
LOUD:
This adjustment effects DP1 & DP2.
NORMAL
NORMAL: Normal Volume
LOUD:
Turn RV1 to adjust the Sidetone of the
doorphone call. Lower the Sidetone if
howling occurs in either the telephone or
doorphone, or if the level is uncomfortable
to an MLT user during a doorphone call.
If howling cannot be eliminated in this way,
this may be due to the surrounding
environment and switches SW1 and SW2
being set to the LOUD setting. Return
SW1 and SW2 to the NORMAL setting
and repeat adjustment of RV1.
Settings
Increased Volume
Increased Volume
71