This information is from the unit and KSP307-00A Iss 5, Oct. '78 K307A DIAL INTERCOM KEY TELEPHONE UNIT P/N 182666-101 HAS TWO PC CARD SOCKETS FOR K160B AND K160C AND A 50 PIN AMP PLUG WIRELIST: C-17 P-26 W-BL T C-E P- 1 BL-W R C-22 P-27 W-OR AB B- 1 C-1 C-Z P-9 P- 2 OR-W AG C-M P-28 W-GN LG C-T P- 3 GN-W L C-N P-29 W-OR RB B-Y P- 4 BN-W RG C-R P-30 W-SL LB C-S P- 5 SL-W LB B-U C-A P-31 R-BL CGC \ B-C C-B P- 6 BL-R TFGC | C-11 P-32 R-OR RH | B-A C-7 P- 7 OR-R TFG | C-D P-33 R-GN -5v | B-22 C-15 P- 8 GN-R LK | TEL-TOUCH B-19 C-16 P-34 R-BN J | CONTROL B- 1 C-1 C-Z P-2 P- 9 OR OR-W BN-R TTG | LEADS C-13 P-35 R-SL Y1 | C-14 P-10 SL-R Y2 | C-19 P-36 BK-BL Y3 | C-6 P-11 BL-BK Y4 | C-C P-37 BK-BN Y5 / B- 4 P-12 OR-BK R1 B- 6 B-V P-38 BK-GN transfer digit for 18 stations B- 9 P-13 GN-BK R3 B-10 P-39 BK-BN R4 B-13 P-14 BN-BK R5 B-15 P-40 BK-SL R6 B-F P-15 SL-BK R7 B-J P-41 Y-BL R8 B-M P-16 BL-Y R9 B-P P-42 Y-OR R0 B- 2 P-17 OR-Y R21 B-T P-43 Y-GN R22 B-7 P-18 GN-Y R23 B-12 P-44 V-BN R24 B-18 P-19 BN-Y R25 B-17 P-45 Y-SK R26 B-D P-20 SL-Y R27 B-K P-46 V-BL R28 B-L P-21 BL-V R29 B-S P-47 V-OR R20 C-U P-22 OR-V relay contact NO C-21 P-48 V-GN relay contact TF C-20 P-23 GN-V relay contact NC B-B C-18 P-49 R V-BN BV P-24 BN-V B-R C-4 BK RO B- 5 C-12 BL R2 C-P C-W BN RT B-14 C-10 BN R5 B-11 C-3 GN R4 B- 8 C-8 OR R3 B-N C-Y R R9 B-16 C-9 SL R6 B-H C-X V R8 B- 3 C-2 W R1 B-E C-5 Y R7