" CENTRALIZED KEY TELEPHONE INSTALLATIONS " 1960s AT&T TELEPHONE SYSTEM TRAINING FILM GG45505

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This Bell Telephone training film (circa 1960s) "Centralized Key Telephone Installations" features Dave Russell, an AT&T engineer, discussing centralized key telephone installations. He emphasizes the importance of space, equipment, and effort in these installations. Space involves conduits, Raceway systems, and closets; equipment includes backboards, connecting blocks, and apparatus mountings; effort refers to the installation process.

Russell introduces the term "horsetails" for dangling cable pairs and stresses the need for standardization and organized approaches to pre-planned closets. He presents a new cross-connecting arrangement that takes up half the space of current methods, accommodating 100 lines and 160 stations using modular backboards with growth potential.

The closet is divided into four color-coded areas: green for CO and PBX, blue for stations, red for key features, and yellow for auxiliary services. He describes seven new hardware items, including four backboards, a new connecting block, a standoff bracket, and a designation strip.

Russell details the process of building an apparatus closet and a satellite closet, explaining the tie cable between them. He concludes by highlighting the benefits of the new arrangement, such as space savings and reduced effort, and emphasizes the importance of standardization.

0:18 - 0:31: Dave Russell, an AT&T engineer, introduces the topic of centralized key telephone installations, focusing on space, equipment, and effort.

0:35 - 1:01: Space involves conduits, Raceway systems, and closets; equipment includes backboards, connecting blocks, and apparatus mountings; effort refers to the installation process.

1:04 - 1:13: Russell discusses learning from various installations and introduces the term "horsetails" for dangling cable pairs.

1:15 - 2:00: He emphasizes the need for standardization and organized approaches to pre-planned closets.

2:03 - 2:45: A new cross-connecting arrangement is introduced, which takes up half the space of current methods.

2:49 - 3:08: The closet accommodates 100 lines and 160 stations, using modular backboards with growth potential.

3:13 - 3:40: The closet is divided into four color-coded areas: green for CO and PBX, blue for stations, red for key features, and yellow for auxiliary services.

3:43 - 4:12: A schematic of the areas is shown, with each color representing a different function.

4:15 - 4:26: Seven new hardware items are introduced, including four backboards, a new connecting block, a standoff bracket, and a designation strip.

4:30 - 5:11: The 66M150 connecting block is described, highlighting its smaller size and functionality.

5:14 - 5:31: A new Snap-On designation strip is introduced, along with the 89B bracket for cabling.

5:34 - 6:04: The 89B brackets are assembled into modular backboards.

6:08 - 6:57: Various backboards are described, including the 183A2 (green), 183B1 (blue), and the red board for key features.

7:02 - 7:57: The 185A1 backboard (yellow) for auxiliary services is introduced.

8:00 - 9:03: The importance of the first backboard's location is emphasized, with a review of the pattern for placing backboards.

9:07 - 10:00: The process of building an apparatus closet is described, including the placement of green, blue, red, and yellow backboards.

10:03 - 11:00: The satellite closet, which slaves off the apparatus closet, is built in a similar pattern.

11:03 - 12:00: The tie cable between the apparatus and satellite closets is explained.

12:03 - 13:01: The process of running a jumper in an apparatus closet is detailed.

13:04 - 14:02: The process of running a jumper to a satellite closet is explained.

14:04 - 15:11: The benefits of the new closet arrangement are summarized, highlighting space savings and reduced effort.

15:13 - 16:13: Russell concludes by emphasizing the importance of standardization and mentions ongoing improvements to the techniques discussed.

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