Manual / Guide · 1972
BSP 550-001-011: 755A PBX, Equipment Test List (1972)
The routine tests and intervals for 755A equipment.
Manual / Guide · 1972
The routine tests and intervals for 755A equipment.
SECTION 550-001-011 BELL SYSTEM PRACTICES AT&TCo Standard Issue 1, December 1972 EQUIPMENT TEST LIST 755A PBX SEE SECTION 010-300-011 FOR EQUIPMENT TEST LIST INSTRUCTIONS. Printed in U.S.A. Page 1 SECTION 550-001-011 , ISS 1 EQUIPMENT TEST LIST I B.S.P. S S TEST OR REQT. 550·550 550-550-500 CLASS FREQ. 755A PBX 2 ALARMS-OPERATION TESTS 550-550 550-550-590 EQUIPMENT AND WORK DESCRIPTION MW 755A PBX 2 LINK & LINK ALLOTTER CIRCUIT5OPERATION TESTS A Link Allotter & Link Cut-Out Keys IT B Dial Tone, Preliminary and Extra IT Pulses, and Busy-Tone 550-550-665 C Ringing and Tripping TT D Line Hunting IT E Chain Circuit Ground IT F M and N Relays IT 1 TRUNKS-OPERATION TESTS A Trunk Signsls IT B Timing Circuit for Trunk Visual IT Signsl C Trunk Holding & Busy Features IT at Key Stations D Page 2 Circuits at Control Keys IT 12M JOB NO.