INTERCOMMUNICATION LOUDSPEAKER TELEPHONE
 |
|
 |
| N1725 |
|
N1725B |
For use with N1470
type master station and used as side stations on loudspeaker
telephone systems.
A warning lamp is fitted for each master station button.
Pressed steel case with Bakelite handset.
Click here for a blueprint
Diagrams are on master telephone list
| Code No. |
No. intercom lines |
No. master lines |
Type |
| N1720 |
5 |
1 |
Table |
| N1721 |
5 |
2 |
Table |
| N1722 |
10 |
1 |
Table |
| N1723 |
10 |
2 |
Table |
| N1724 |
15 |
1 |
Table |
| N1725 |
15 |
2 |
Table |
| N1726 |
5 |
1 |
Wall |
| N1727 |
5 |
2 |
Wall |
| N1728 |
10 |
1 |
Wall |
| N1729 |
10 |
2 |
Wall |
| N1730 |
15 |
1 |
Wall |
| N1731 |
15 |
2 |
Wall |
Introduced around 1933.
C. B. Intercommunication Telephones
SIDE STATION FOR LOUDSPEAKER MASTER
When the side stations are simple call and reply to the master, N1594 is the instrument used. It is a black moulded
Bakelite table set of modern design, fitted with a push button for calling.
Side station instruments N1721B - N1731B with intercommunication facilities are similar to the popular standard intercommunication telephones, type N1620A, with the addition of two pre' keys and lamps associated with the master station lines.
The highly efficient Bakelite micro-telephone is standard for both types of side station
instruments.
The operation of this loudspeaker system is similar to that of the ordinary intercom, system and is as follows:
A call to the master station is indicated there by a lamp and is answered by operating the key
associated with the calling lamp.
A call by the master to a simple side station N 1594 is indicated by buzzer and answered by removing the micro-telephone.
A call by the master to an intercom, type of side station is indicated there by a lamp which will glow even if the side station is engaged. The call is answered by removing the micro-telephone and pressing the button associated with the calling lamp.
Conference can be established by the master station operating the keys of the
desired side stations.
Taken From the Ericsson catalogue No. 49
N1723B1
|
ERICSSON