AT&T System 75 Wiring Diagram page 54

Figure 2-14. 183A-Type Backboard
183-TYPE BACKBOARD ORDERING INFORMATION
Color
Code
183A1 Blue
183A2 Green
183A4 Purple
183A5 Yellow
183B1 Blue
183B2 Green
183B4 Purple
183B5 Yellow
183C1 Blue
66-Type Hardware Description
Comcode
Mounts
(4) 66M1-50 101 412 963
Conn Blocks
(4) 66M1-50 101 412 971
Conn Blocks
(4) 66M1-50 101 937 902
Conn Blocks
(4) 66M1-50 101 986 446
Conn Blocks
(8) 66M1-50 101 412 989
Conn Blocks
(8) 66M1-50 101 564 631
Conn Blocks
(8) 66M1-50 101 937 928
Conn Blocks
(8) 66M1-50 101 986 453
Conn Blocks
(2) 66M1-50 103 222 790
Conn Blocks
2-27