Manual / Guide · 1952
BSP 550-550-500: 755A PBX, Alarms, Operation Tests (1952)
Alarm operation tests for the 755A.
Manual / Guide · 1952
Alarm operation tests for the 755A.
SECTION 550-550-500 Issue 2, May 1952 AT&T Co Standard BELL SYSTEM PRACTICES Plant Series ALARMS OPERATION TESTS 755A PBX 3.04 Connect battery to the alarm bus-bar on the fuse panel. 1. GENERAL Note: Do not use the fuse on the fuse panet designated 1.01 This section describes methods of testing the alarms "FAU for making this test as the alarm is not connected in a No. 755A PBX to this fuse. 1.02 This section is reissued to specify a WIAF cord (190 3.05 <;:heck that the (F) f1;!se alarm lamp on the fuse panel ohms resistance) instead of a test receiver for testing lIghts and when prOVIded the alarm bell rings. +fuse alarms and to revise the central office alarms to cover additional circuit arrangements. 3.06 When provided, momentarily operate the (A) alarm+key and check that the alarm bell is silenced and the 1.03 The tests cover the operation of the alarm circuit when~ (F) alarm lamp remains lighted. a fuse fails and the operation of the major alarm at the central office (when the alarm is extended to the central office) ..J 3.07 When the PBX alarm is extended to the central office have the central office attendant check that the red 1.04 When the PBX alarm is extended to the central Class A (major) lamp is lighted at the central office and the office, call and notify the proper person at the central alarm bell rings. office before and after tests are made. 3.08 Have the central office attendant operate the associ2. APPARATUS ated PBX-A or DA key and check that the red Class 2.01 No. lO11B Dial Hand Test Set (or equivalent). ~ A (major) lamp remains lighted and the alarm bell is silenced. 3.09 Remove the battery from the alarm bar and check that 2.02 Testing Cord - WIAF Cord, 8 feet,' 6 inches long, . .the (F) fuse alarm lamp on the fuse panel is equipped with one KS-6278 Clip and one No. 411A Tool extingUIshed. (for use in connecting battery to alarm bars). 3.10 Have the central office attendant check that the red 2.03 Testing Cord-WID (or No. 760) Cord, 1 foot, 8 . Clas~ A. (major) lamp is extinguished, the white super.J vIsory inches long (for use tn strapping terminals). lamp IS hghted and the alarm bell rings. 3.11 Have the central office attendant reoperate the PBX-A~ 3. METHOD . or. DA key and check that the white supervisory lamp 3.01 Before starting the test, observe that no alarm lamps IS extingUIshed and the alarm bell is silenced. are lighted. Note: If ~he "!" B X is connected to a central office using 3.02 When the PBX alarm is extended to the central alarm CIrCUIt SD-21482-01 .the .PBX-A or DA key will office, establish a connection to an idle central office have ~o be restored to extingUIsh the supervisory lamp trunk at the equipment cabinet as follows: Connect the dial and SIlence the bell. .J hand test set to the T and R terminals of an idle key station 3.12 When a. connection has been established to the central which is not restricted for outgoing trunk service. Next, strap . office, dIsconnect from the central office by removing the idle station G terminal and trunk·terminal O. 2, 3 or 4 the dw.1 hand test set and strap from the terminals at the PBX depending on the trunk to be ilsed) together. These terminals used for this connection. are located at the PBX 4. REPORTS 3.03 After these connections have been established, call the proper person at the central office and arrange to have 4.01 The required record of these tests should be entered the Class A (major) alarm observed at the central office. on the proper form. © American Telephone and Telegraph Company, 1952 Printed in U. S. A. Page 1 1 Page