719S 2 Door Switching Unit
PD-008 Iss 6
Installation & Operation Manual
Page 3 of 20
General Description
The Model 719S Switching Unit provides a means of operating a door entry telephone
system from two entrances. Several 719S units may be combined to extend operation
up to a maximum of sixteen entrances.
Operation
When a telephone is called from a given entrance, the switching unit connects the
telephone to the calling entrance only. The unit remains active for a preset period (30 -
120 secs), during which time the resident may converse with the caller by lifting the
telephone handset and, if required, allow the caller to gain access. By pressing the
telephone 'lock button' the lock release (of the active entrance only) will operate for a
preset period (3 - 20 secs) and end the call.
When a given entrance panel is in use, all other entrances are 'locked out' for the active
period (30 - 120 secs), during which time it is not possible to call any of the telephones
from these entrances. This engage condition maybe indicated to other callers by an
optional 'engaged lamp’ installed at each door.
Telephones
The 719S switching unit is compatible with the telephones listed below: -
Telephone model Type
Diagrams
801
12V AC/DC
1 and 2 (AC) or
3 and 4 (DC)
801S
12V AC/DC with Buzzer Mute
801P
12V AC/DC with Privacy of Speech
801PS
12V AC/DC with both 801S and 801P
features.
801-DESK
12V AC/DC desk mounting
BS-LX
12V DC with Mute + LED features
3 - 7
The 719S is compatible with 500 series phones, please refer to manual PD-008 Iss 4.
* Only 801 Series phones manufactured after April 2000 (Electronic ring) are DC
compatible.
Power Supply
The 719S is powered from a 12V AC 2A PSU (225) for AC telephones or 12V DC 4A
PSU (PS4) for DC telephones. A separate power supply is required for each 719S unit
in multi-door systems (see Diagrams 2 or 4).
It is also possible to operate a fail-safe lock release on an AC system with the addition
of a 12V DC 1.5A PSU (340C), see diagram 1.
