Bell System Practices 43B Installation, Operation And Maintenance Manual page 17

1SS 4, SECTION 501-165-102
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(NOTE 21
NOTES:
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2.
3.
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6.
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H[AvY CIRCUIT LINES SHOIW ARE ON THE LOGIC BOARO. UNLA8ELEL7
CONTACTS SHOW CIRCUIT PATH EITHER OPCN OR CLOSED BY THE
BRUSHES IN THE HOME POSITION.
SCANNING FUNCTIONS ARC ACCOMPL 191E0 BY MEANS OF C I RCULAR
PATHS ON THE LOGIC BOARO ANO MOVING CONTACT BRUSHES.
ALPHABETICAL DESIGNATIONS REFER TO CONNECTIONS BETWEEN
LOGIC BOARO ANO COMPONtNT BOARO.
TO sTOP OIAL FOR SECONO DIAL TONE, AFTER FIRST OIGI T W3VE
(EIL) LCAO FROM Tf*lNAL 3 TO TERMINAL 8.
TO STOP D I AL FOR AOOI TIONAL DIAL TONE, AFTKR SEcoND o'
THIRD DIGITS MOVE (v) LEAD FROM TERMINAL 3 TO TERMINAL 8.
FOR STOP AFTER sECOND DIGIT, THIRO OIGIT MUST BE PROGRAMMED
FOR A "U".
WHEN THE RINGER I S CONNECTEO IN THf EXTERNAL SET, CONNECT
(S-' ) LEAD TO TCRMINAL 2 TO PREVENT K8 RELAY FRCM OPERATING
ON RINGING CURRENT.
TO CHANGE FROM RESTRICTED MOOE TO UNREST' I CTfD MODE:
(A) NDVE (BR) LElfI FROM TERMINAL 4 TO 8.
(B) MOVE (BK) LE40 FROM TERMINAL 8 TO 4.
(C) MOVE EXTERNAL TELEPHONE SET LEAD (Tl P) FROM
TERMINAL I TO
12.
TO INCREASE
LOOP CURRENT THROUGH DIAL ON LONG LOOPS
(OVER 400 OHMS), CONNECT (Y-BR) LEAD TO TERMINAL 2.
SPADE TIPPEo INSULATEO ANO STOREO.
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Fig. 14—53B
(MD) Dial Connections,
Factory Wiring, Restricted Mode (Sheet 2 of 2)
Page 17