Bell System Practices 2712B Reference Download | Manualshive

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Summary of Contents for 2712B

Page 1: ...ation maintenance and connection information for the 2712B and 2712BM telephone sets 2 01 2 02 NOTICE Telephone Set Set Telephone 2712B Set Telephone 2712BM Modular Replaceable Components Cord Mounting D14L or D14R 87 2712B cord Mounting D14S 87 2712BM Cord Handset H4CJ 2712B Cord Handset H4DU 2712BM Dial 35E4A or 35AD4A Key 638E line and signal key KS 19240L2 or L3 Dial Lamp Socket t KS 19387Ll D...

Page 2: ...signaling 2 06 The 2712B is also equipped with a D14L or D14R 87 mounting cord G3 type handset and H4CJ handset cord The 2712BM is equipped with a D14S 87 mounting cord and G15A handset The H4DU handset cord must be ordered separately Page 2 3 02 Dial Light Transformer Select a 105 120 volt ac receptacle that is on a circuit not controlled by a switch A 2012A transformer should be used with each t...

Page 3: ...on mounting bracket securing the guard assembly mounting bracket under the right hand dial mounting screw Fig 5 6 Reinstall housing 3 05 Apparatus Blanks A 124A apparatus blank is available to insert into the rear notch when not filled Refer to Section 501 110 100 for selection 3 06 Speakerphone May be used with the 2712B or 2712BM telephone set Refer to Section 512 620 474 for 3 type or to Sectio...

Page 4: ...terfere with the network as shown in Fig 6 Note Tabs should be cut at an angle leaving 1 16 inch at the plunger well Tabs longer than 1 16 inch will cause the plunger to bind Page 4 when housing is installed Tabs less than 1 16 inch will permit plunger to fall through 4 05 Housings manufactured prior to 1970 have no tabs Housings manufactured after 1974 identified by an embossed N inside the housi...

Page 5: ...6 1 r RI RI a I I CLOSE FOR NIGHT LIGHT W BL iC i TRMTR G3AR HANDSET RCVR F NOTES I THE 27128 TELEPHONE SET IS INTENDED FOR USE WITH AN EXTERNAL RINGER FOR RIN GER CONNECTION SEE SECTION COVERING El TYPE RINGER 2 LINE SWITCH OFF HOOK SEQUENCE be CLOSES ab OPENS de CLOSES IQ OPENS 3 FOR HOLD ON LINE 2 TRANSFER BR AND W HOLD KEY LEADS TO TERMINALS 2 ANO 4 RESPECTIVELY INSULATE AND STORE BK LEAD 4 FO...

Page 6: ... 0 I rn 0IAL rn is 1 LI I LAMP TRNSF IOI IG IG Y 11 IY Gl IR f IQ BK W BL L2 GI NDTES 1 THE 2712BM TELEPHONE SET IS INTENDED FOR USE WITH AN EXTERNAL RI NGER FOR RINGER CONNECT IO N SEE SECT IO N COVER ING E1 T IPE RINGER 2 PROVIOE A1 G ROUND AT EXCLUOCD STAT ION l THI S GROUND WILL O PERATE BUZZERS O R RINGERS THAT REQU IRE DC IF AC IS REQU IRED USE THI S G ROUND TO OPERATE AN AUXILIARY RELAY THA...

Page 7: ... TO DIAL LIGHT Y G TRANS FORMER 0 G Y ii DIAL LI GHT I C VI rn W j ji S i W R R W BL i BK c G L2 0 0 TRMTR L L J RCVR G3AR HANDSET I W lTES I G TO MODIFY 2712B TELEPHONE SET AS SHOWN t 10VE W 0 LINE KEY LEAD FROM TERMINAL G OF NETWORK TO TERMINAL 3 OF TERMINAL STRIP 2 SEE SECTION COVERING El TYPE INGERS FOR CONNEC T IONS TO EXTERNAL RINGER INSULATED AND STORED TI BK J R G i1 1 111 l1 ii I i W DIAL...

Page 8: ... BL l DIAL V e r cI k BK NOTE I 16 BL I I W BL 4l 7g y G MTR 11 Q I _ alL r IL____ BK _ GJ R L T DIAL NI GHT I LIGHT l H NOTES 1 THE 2712BM TELEPHONE SET IS INTENOEO FOR USE WITH AN EXTERNAL RINGER FOR RINGER CONNECTl ON SEE SECTION COVER ING E1 TYPE RINGER 2 PROVIDE A1 GROUND AT EXCLUOEO STATI ON l TH IS G ROUND WILL O PERATE BUZZERS OR RINGERS THAT REQU IRE OC IF AC IS REQU IRED USE TH IS GROUND...

Page 9: ...NSULATE ANO STORE OR CONNECT TO SPARE I vci r c _ 1ii l Ol TERMINAL T W BL 1 h h F I Tl T IW 0 LINE _JO W 18 A OR 1 13 W C BL W It Tf il lit 0 2 24 I n I R i i 1 Iini _ i 11 I 1 lt il 1 H i G d h DIAL 4 I ii GJ j BK BK I R GJ R I R G V rn L2 ff S R K I G li i t W I f X i L2 B BL GN W _w TO SIGNAL S W E2 y BL CKT I V G TO Al GRD NOTE I J C b TO G Y DI AL L IGHT TRASFORMER Y CL OSE FOR NIGHT LIGHT A...

Page 10: ...LIGHT SWITCH CJ g _ al I NOTES 1 THE 2712BM TELEPHONE SET IS INTENDED FO R USE WI TH AN EXTERNAL RINGER FO R R INGER CONNECT ION SEE SECT ION COVER ING E1 TYPE RINGER c PRO VID A1 G RO UND AT EXCLUDED STATI ON J TH IS G ROUND WILL OPERATE U UIZERS OR RINGERS THA f REQU IRE DC II AC 1 RlOII IRED US HI S G ROUNO TO OPERATE AN AUX IL IARY RLLAY 1HAT CAN SUPPLY AC 4 TO PREVENT FAL SE HOLD COND ITI ON ...

Page 11: ...NSFORMER x Y T i ii ii I it c t CLOSE t FOR 1H DIAL NIGHT 1H LIGHT LIGHT iM iYI IBRI I I RI Ii IOI Ml BL l IW ifili IBl W R RI f t j t k fl IW BLI I m WI d r I 11 ISi BK LI n R GN BL B a i A K G L2 0 f 0 12 0 0 BK I TRMTR t5 RCVR G3AR HANDSET I NOTES I SEE SECTION COVERING EJ T fff RINGERS FOR CON NECTIQNS _TO EXrERNAL RINGER 2 PROVIDE Al GRD AT EXTENSION STATION INSULATED ANO STORED t MIW CORD OR...

Page 12: ... j BL k SI 0LI A BK MTR I R Q BK 41 0 vv O 0 I t Y r NL I I j G L2 s t r NOTES DIAL LIGHT NIGHT LI GHT SWITCH I THE 2712BM TELEPHONE SET IS INTENDED FOR USE WITH AN EXTERNAL RINGER FOR RINGER CONNECTION SEE SEC TI ON COVER ING El TYPE RINGER 2 PROVIDE A1 GROUND AT EXCLUDED STAT ION l THIS GROUND WIL L OPERATE BUZZERS OR RINGERS THAT REQU IRE DC IF AC I S REQU IRED USE THI S GROUND TO OPERAH AN AUX...

Page 13: ...ring respectively of excluded station at connecting block Insulate and store ISS 5 SECTION 502 703 101 MODIFICATION FOR 1 LINE PICKUP HOLD AND SECRETARIAL SERVICE 2712B WIRE REMOVE FROM CONNECT TO OR COLOR LEAD TERM NET TERM STRIP STRIP Line Key W O G 3 MODIFICATION FOR 2 LINE PICKUP EXCLUSION ON LINE 1 AND SIGNALING USED WITH 1A1 OR 1A2 KTS 2712B WIRE REMOVE FROM CONNECT TO OR COLOR LEAD TERM NET...

Page 14: ...TERM STRIP STRIP G 3 9 L2 10 El El 1 8 3 1 El tTABLE H41 MODIFICATION FOR 1 LINE PICKUP CUTOFF FEATURE FOR EXTENSION STATION OR EXTERNAL LINE RINGER 2712BM WIRE REMOVE FROM CONNECT TO OR COLOR LEAD TERM TERM NET STRIP STRIP W O G 10 0 9 L2 O BK 10 Line BK 4 8 Key V 1 R 1 8 R 6 1 y 2 El y 1 BL El Hold s 10 Key 0 L2 BR El Insulate and store MODIFICATION TO ADD D 180229 KIT OF PARTS POLARITY GUARD AS...

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