OGT Switchman At Work
Panel Switchman using transmission measuring test set. Circa early 1970's. The various colored bars actually represented outgoing trunks with colors used to delimit trunks groups. There was one jack for each outgoing trunk. The green cords shown plugged into trunks are how the Switchman would access trunks for testing. The gray device his left hand is on was used to measure the signal coming back from a distant offices miliwatt 1000 cycle test line. Below his left arm are the rows of buttons used to enter the number you wanted dialed on the trunk by the OGT circuits. The OGT contained a mini sender for trunk testing. An old example used to be 0077 for 1000 cycle test tone and 0085 for test line test (answer supervision test). These numbers no longer apply.
OGT Switchman At Work
Panel Switchman using transmission measuring test set. Circa early 1970's. The various colored bars actually represented outgoing trunks with colors used to delimit trunks groups. There was one jack for each outgoing trunk. The green cords shown plugged into trunks are how the Switchman would access trunks for testing. The gray device his left hand is on was used to measure the signal coming back from a distant offices miliwatt 1000 cycle test line. Below his left arm are the rows of buttons used to enter the number you wanted dialed on the trunk by the OGT circuits. The OGT contained a mini sender for trunk testing. An old example used to be 0077 for 1000 cycle test tone and 0085 for test line test (answer supervision test). These numbers no longer apply.