In 1971, a new telephone exchange and trunk line building was erected to take place of the existing manual exchange and provide automatic trunk line switching facilities to surrounding district exchanges.
22.
Handling local calls between manual exchanges via a third operator at a tandem exchange is uneconomic, but without tandem switching each manual exchange would require direct junctions to every other manual exchange.
23.
The manual exchange number prior to automation phone number was ( 050 ) 4841 to reach the exchange, then the numbers ( 050 ) 201-000 to 201-999 were allocated for Balranald subscribers.
24.
In early electromechanical switches including panel switch, a " district junctor " handled supervision and talk battery duties for outgoing calls, similar to the duties of the cord circuit of manual exchanges.
25.
Handling local calls between manual exchanges via a third operator at a tandem exchange is uneconomic, but without tandem switching each manual exchange would require direct junctions to every other manual exchange.
26.
From the communist era Poland inherited an underdeveloped and outmoded system of telephones, with some areas ( e . g . in the extreme South East ) being served by manual exchanges.
27.
Handling local calls between manual exchanges via a third operator at a tandem exchange is uneconomic, but without tandem switching each manual exchange would require direct junctions to every other manual exchange.
28.
Later, " Coded Call Indicator working " equipment was installed at some manual exchanges so that the caller could dial all seven digits, and the required number would be displayed to the operator.
29.
In the British Director telephone system, "'Coded-Call Indicator "'working ( CCI ) filled a similar role, as it displayed dialled telephone numbers at the local manual exchange in a mixed ( automatic and manual ) linked-number area.
30.
Calls to manual exchanges ( where the caller asks the manual exchange operator for the number ) and calls to special service like 0 for Operator or 999 for emergencies do not require any numeric digits.
