AT&T 75 Wiring Manual page 434

66-TYPE HARDWARE
connecting blocks. The 183B-type backboards can mount 8 66M1-50 or 157B connecting
blocks. A blue 183C-type backboard is available that will mount only 2 66M1-50 or 157B
connecting blocks. White backboards that are used for connections to satellite closets can be
obtained from outside venders.
183-TYPE BACKBOARD ORDERING INFORMATION
Code
183A1
1 8 3 A 2 G r e e n
183A4 Purple
183A5 Yellow
183B1
183B2
183B4
183C1
4-8
Mounts
Color
4-66M1-50 or 157B 101 412 963
Blue
Connecting Blocks
4-66M1-50 or 157B 101 412 971
Connecting Blocks
4-66M1-50 or 157B 101 937 902
Connecting Blocks
4-66M1-50 or 157B 101 986 446
Connecting Blocks
8-66M1-50 or 157B 101 412 989
Blue
Connecting Blocks
8-66M1-50 or 157B 101 564 631
Green
Connecting Blocks
8-66M1-50 or 157B 101 937 928
P u r p l e
Connecting Blocks
2-66M1-50 or 157B 103 222 790
Blue
Connecting Blocks
Figure 4-4. 183A-Type Backboard
Comcode