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| prepared :luo ming li approved: xu wenbing date : 2001/06/11 drawing no.: isdn transformer rev.: a0 page : 1/1 o t1/cept/e1/isdn-pri transformer p/n: 4S1142 data sheet a. general specifications 1. eight transformers in a surface mount package supports four transmit and four receive channels 2. cross talk : -65db or better 3. models matched to leading quad and dual t1/e1/ceptisdn-pri transceivers . 4. operating temperature range: 0 to +70 b. electrical specifications @25 1. isolation hi-pot:1500 vrms 2. turns ratio( 2%) : tx=1:2.4, rx=1:1 3. tx/rx ocl.: 1.0 mh min /1.0 mh min 4. tx/rx. cw/w: 35 pf max/35 pf max 5. tx/rx l/l: 0.5 h max/0.5 h max 6. tx. primary pins: 1-2, 8-9, 11-12, 18-19 7. rx. primary pins : 25-24, 28-27, 35-34, 38-37 c. schematic & mechanical:
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