KEY TELEPHONE UNIT 237-TYPE IDENTIFICATION, OPERATION, AND CONNECTIONS

Transcription

1 ELL SYSEM PACCES A&Co Standard SEC ue 8, May 1974 KEY ELEPHE UN 237YPE DENFCA, OPEA, AND CNECS 1. GENEAL 1.01 hi ection i reiued to: Delete Speakerphone Sytem No. la and lal connection Add Speakerphone Sytem No. 4A connection to Fig. 2, 3, and DENFCA PUPOSE 2.01 he 237 type key telephone unit (KU) (Fig. 1) provide for bridging of two line for a 3way conference in the following arrangement: 615/16 N. A central office (CO) line and a PX line wo PX line or two CO line Note: ranmiion quality cannot be guaranteed when two CO line are bridged. A CO or PX line and an intercom line. APPLCA CO or PX line ued in Key elephone Sytem No. la, lal, or 1A2. DESGN FEAUES Circuit can be operated by excluion witch, external nonlocking key, or converted line pickup key. Circuit buy lamp when line pickup key i ued. Control tation can leave conference by placing line on hold and remaining offhook, allowing other partie to continue converation without tranmiion lo. Fig Key elephone Unit Circuit may be controlled by two tation when diode protection i locally furnihed. Either control tation can diconnect from conference leaving two partie to continue conference. Compatible with peakerphone. Circuit i arranged to cancel conference when handet i placed onhook or peakerphone i returned to American elephone and elegraph Company, 1974 Printed in U.S.A. Page 1

2 SEC One of the conference line may be diconnected by returning excluion key to normal or by operating the nonlocking key. No operator aitance neceary. 3. MEHOD OF OPEA 3.01 nitiating a Conference Call: (1) Etablih a call (either an incoming or outgoing call) on either of the line aociated with the bridging circuit. (2) Place call on HOLD. Note: Under certain condition, it i poible to etablih a call on the other line without placing the firt call on HOLD. hi i undeirable ince the firt party hear the dialing ignal which are intolerably loud under thee condition. (3) Etablih a call on the other line aociated with the bridging circuit. (4) Operate the bridging key when both partie are available, thereby conferencing both line Leaving a Conference Call (Control Party Only): (1) Operate the hold key. (2) Operate a third pickup key to anwer or etablih a call on another line. Note: he control party may return to the conference by reoperating either of the two aociated pickup key. However, when a conference i placed on HOLD, tranmiion loe are introduced by the holding bridge which may prevent the remaining conferee from continuing the conference until the control party return eleaing a Conference Call: (1) Control partyplace handet onhook or (2) eturn manual excluion key to normal or (3) Operate peakerphone OFF button. Note: he control party can remain connected to either line after the conference ha been releaed by depreing the pickup key for the line which i to remain connected, and momentarily operating the nonlocking key or retoring the excluion key to normal. 4. CNECS 4.01 When a nonlocking key i ued to control the bridging circuit, a locally provided KS15724, Lit 1 diode (or equivalent) mut be intalled in the A lead of the control tation et. For KS15724 diode connection, refer to "Station uy Lamp" option for the particular et in the aociated connection ection. Failure to intall the diode may caue damage to tranitor Q3, a fale hold condition, or both, in the 400D KU line circuit. hee condition are caued when the control tation goe onhook after a conference i completed. wostation Control 4.02 When two tation are connected to the bridging circuit, each of the tation et may independently or jointly control the circuit. When the circuit i connected to two tation et, operation i the ame a when connected to only one tation et. Note: When two tation et are to be provided with bridging circuit control by uing nonlocking key, two KS15724, Lit 1 (or equivalent) diode mut be locally upplied and connected a hown in Fig When one of the two control tation i uing the bridging circuit and the other tation goe offhook, the L lead from each telephone et will provide a locking path for the operated circuit. f the firt tation terminate the call before the econd tation, the nonlocking control key on the telephone et at the firt tation mut be momentarily operated to releae the bridging circuit When one tation i uing the bridging circuit and the other tation i not in ue, the circuit will releae when the tation goe onhook or the peakerphone i turned off When a conference call i in a held condition, the bridging circuit remain operated. Page 2 SP i08_ jpg Scanned by Frank Harrell, (Cowboy Frank) Catle ock, Colorado Oct 15, :51:04

3 SS 8, SEC Note: o minimize tranmiion loe, each line aociated with the 237 A or key telephone unit hould be connected to the ame type line equipment. hi i neceary due to the difference in deign of holding circuit Connection ndex Fig A (MD) KU, Schematic and Connection Fig KU, Schematic and Connection Fig. 4AG and L Lead Connection for 2Station Control. Page 3 SP iO jpg Scanned by Frank Harrell, (Cowboy Frank) Catle ock, Colorado Oct 15, :51:24

4 SEC O CO O PX CK AS SOC WH SECD L1 HE O SECD Ll NE N EL SE AS SOC WH DGHG CK (NOE 2) O KS LNE CK fo SECD L1 NE (NOH 2) O LAP O POWE SUPPLY [: [ r: 1 >+ [@ LG L 0 A. GD NOES:. HE SA ULZNG HE DGNG CCU MUS E EQU PPEO WH A HOLD KEY. HE DGNG CCU MAY E COLLED Y A N LOCKNG KEY O AN EXCLUS KEY. 2. HE A LEAD S OED N KEY EL SYS NO. la. 3. WHEN HE CCU S COLLED Y HE EXCLUS KEY, EOVE HE EXCLUS LEADS fom AND EMNALS N ELEPHE SE AND NSULAE. GOUND S CNECED O HE KL LEAD HE EXCLUS KEY. 4. EMOVE SAP EWEEN EMNALS 6 AND 6 WHEN ESNG O EADJUSNG ELAY C O S ;.: ),_ 7 18 ;:; $(> ;; lr " ' 0 f 12+ 2f c 10 c A (MD) KU 2,.z c 6 6,.;,.; : J O KS LNE CK FO FS LNE (NOE 21 0 A O FS LNE N EL SE ASSOC WH OG NG CK NOE AND 2) 0 S O 51 O KEY N EL SE USED O COL DGNG CK (NOH 4) G?r; O EXCLUS KEY WHEN USED O COL DG HG CK (NOE 3) O EL SE O SPEAKEPHE SYS L NO. 3A COH UN AG O SPEAKEPHE SYS NO. 4A 108A COLLED Y NLOCK NG COLLED Y EXCLUS CNECED O KEY EL SYS NO. A O CNECED O SPEAKEPHE SYS NO. 3A C UN. CNECED O SPEAKEPHE SYS NO. 4A DA LOUDSPEAKE. Fig A (MD) KU Schematic and Connection. Page 4 SP i08_19740S04.jpg Scanned by Frank Harrell, (Cowboy Frank) Catle ock, Colorado Oct 15, :51:44

5 SS 8, SEC O CO O PX CK [ AS SOC WH SECD ll NE O SECD [ LNE N EL SE ASSOC WH DGNG CK O KS [ L1 NE CK ro SECD ll NE O lap G O [ POWE SUPPlY A,H.;! lg l 3 A (!) (z5 GD 21 2 },. 3 1\ 1 / 5 1\ = 2376 KU 9 10 f }: 4 'V 17 c 18 c 10 1_ ' r 8 t 7 7 t.t 3 25 r 4 2 H} }, 6 c6 1 O KS LNE CK A,H j FO FS LNE (!) J A,H (!) O FS LNE N EL SE ASSOC WH DGNG CK (NOE ) (D O Sl O KEY N EL SE USED O COL loo ( (!) DGNG CU NOE 3) O EXCLUS KEY J:WHEN USED O COL OG NG CK (NOE 2) f w. O EL SE Of! SPKPHOHE SYS NO. 3A C UN G O SPKPHOHE SYS NO. 4A OA LOUDSPEAKE. NOES:. HE SA ULZNG HE DGNG CCU S E EQUPPED WH A HOLD KEY. HE DGNG CCU AY E COLLED Y A NLOCKNG KEY Oft AN EXCLUS KEY. 2. WHEN HE CCU S COLLED Y HE EXCLUS KEY, EMOVE HE EXCLUS LEADS r AND ENALS N ELEPHE SE AND NSULAE. GOUND S CNECED O HE Kl lead HE EXCLUS KEY. 3. EMOVE SAP EWEEN ENALS 6 AND 16 WHEN ESNG Of! EADJUSNG ElAYS C O S, (!) CN CED O KEY El S YS NO. A. CNECED O SPEAKEPHE SYSE NO. 4A OA LOUDSPEAKE. CNECED O SPEAKEPHE SYSE NO. 3A COL CNEC D O KEY EL SYS NO. A O A2. (!) COLLED Y EXCLUS KEY. (D COLLED Y NLOCKNG KEY. Fig. :J.t237 KU, Schematic and Connedlon.. Page 5 SSP S i08_19740SOS.jpg Scanned by Frank Harrell, (Cowboy Frank) Catle ock, Colorado Oct 1S, :52:03

6 SEC A SPEAKEPHE NO. L SWCH M 0':)(llto 237YPE KU (NOE ) 24r.< rk (NOE 2) AG los A LOUDSPEAKE S 4A SPEAKEPHE NO. SWCH M OrXE111 EL SE NO, L SWCHHOOK L2 L 55 A 558 C C UN 3A SPEAKEPHE NO. 2 0 SWCH M )( ) (NOE 2) AG los A LOUDSPEAKE S 4A SPEAKEPHE NO. SWCH M 0)X(ll l NOES:. CNECS FO WOSA COL AE HE SAME AS SHOWN FGS. 2 O 3 WH HE EXCEP OF HE L AND EL SE NO. G AG WHCH MUS E WED AS SHOWN. 2. CNEC SPEAKEPHE SYSEMS AS SHOWN WHEN POVDED WH COLLNG SAS. KS15724, LO EQUVALEN) DODE. L SWCHHOOK POCUE LOCALLY. L2 Fig. AG and L Lead Connedion far 2Station Control. Page 6 6 Page SSP S i08_1974 0S 06.jpg Scanned by Frank Harrell, (Cowboy Frank) Catle ock, Colorado Oct 1S, :52:22