Bell System Practices 851 Identification, Installation, Connections, And Maintenance page 21

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ISS 8, SECTION 503-601-101
NOTES:
I, CONNECTIONS FOR PtB RINGER SH!lo4N, RINGER CONNECTIONS
FOR SETS EQUIPPED WITH PIA RINGER SAME AS PIB EXCEPT
(BL), (S), AND (S-R) LEADS ARE INSI.l.AT£0 AND STORED.
(CURRENT MODEL PIA RINGERS DO NOT HAVE (Bl) LEAD).
2. LATER 28518 (MD) HLEPHONE SETS ARE EQUIPPED \liTH
G3A6 HANDSET WHICH IS WIRED DIRECTLY TO TELEPHONE SLT,
EARLY PROOUCTIOH 2851-TYPE HLEPHONE S£TS \([R[
EQuiPPED WITH A GIZA HANOS[T USING A PLUG-ENDED CORD.
..
2851 ElM TELEPHONE StTS ARE SHIPPED WITH GISA HANDSETS
AND H40U HANDSET CORD,
*
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Fig. 27-2851BT, 28518, and 2851BM Telephone Set, Connections (Sheet 2 of 2)
Page 21