ERICSSON SWITCHBOARD
No's OB 3000 & OB 3001


Type OB 3000-3001
Floor Pattern Switchboards
Mechanically restored Jack Indicators
Metallic Circuit
Local Battery System

OB 3000/25 shown

FRAMEWORK

Woodwork, polished mahogany, with the jack field covered with fibre. legs enamelled cast-iron.

EQUIPMENT
1 JACK INDICATOR for each line.
1 PAIR OF CORDS with 2-point plugs (see table for number of cord circuits on each board).
1 SPEAKING AND RINGING KEY for each cord circuit.
1 DOUBLE SPEAKING KEY.
1 DOUBLE RINGING KEY for Hand Generator.
1 DOUBLE BATTERY RINGING KEY.
1 POWER GENERATOR RINGING KEY.
1 TESTING, KEY.
1 PRESS BUTTON for short circuiting the secondary winding of the induction coil.
1 PRESS BUTTON for closing the transmitter circuit.
1 CLEARING INDICATOR for each cord circuit.
1 PRESS BUTTON for each cord circuit, for restoring the clearing indicator when both plugs are, in use.
NIGHT, BELL.
PILOT VISUAL INDICATOR for calling.
PILOT VISUAL INDICATOR for clearing.
2 NIGHT BELL SWITCHES.
RINGING VIBRATOR for supervising the outgoing ringing current.
GENERATOR. RH 5000, 5-magnet.

TYPE

OLD TYPE No.

No. of metallic ccts

No. of cord ccts

Height ins

Width ins

Depth ins

Weight in lbs.

OB 3000/25

975

5

5

51.57

19.52

24.64

137.81

OB 3000/30

976

30

6

51.57

19.52

24.64

140.00

OB 3000/40

977

40

8

51.57

19.52

24.64

146.63

OB 3000/50

978

50

10

51.57

19.52

24.64

154.35

OB 3000/100

979

100

10

56.30

23.23

23.23

209.47

OB 3000/200

981

200

15

56.30

23.23

23.23

255.80

OB 3001/100

980

100

15

56.30

23.23

23.23

216.09



Types OB3000/100 and OB3001/100 are both equipped for 100 lines, but in OB3001/100 provision is made for equipping a further 100 lines, making it into a 200-line board.
NOTE. The jack indicators are mechanically restored by the action of the plug and the clearing and pilot visual indicators, are self-restoring.

 


Taken from the Ericsson Telephone Catalogue 1914

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Last revised: April 29, 2000