ID:
2539
Maker's Name:
Master Instruments Pty Ltd
Where made:
Australia
Dimensions:
14.5 × 17.8 × 14.5 cm
Displays analogue telephone circuit voice traffic/hour in erlangs.The erlang is a dimensionless unit that is used in telephony as a measure of load on service-providing elements such as telephone circuits or telephone switching equipment. A single cord circuit has the capacity to be used for 60 minutes in one hour. Full utilization of that capacity, 60 minutes of traffic, constitutes 1 erlang.
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