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| prepared :qingli wu approved: xu wenbing date : 2001/01/28 drawing no.: isdn transformer rev.: a1 page : 1/1 t1/cept(e1)/isdn-pri transformer p/n: 4S1142M 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. ic grade transfer-molded package with stand 235 ir reflow . 5. operating temperature range: -40 to +85 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. :1.5 mh min /1.5 mh min 4. tx/rx. cw/w: 35 pf max/35 pf max 5. tx/rx l/l: 0.6 h max/0.6 h max 6. dcr : 0.8 max 7. transmit : 1-2, 8-9, 11-12, 18-19, 40-39, 33-32, 30-29, 23-22 8. receive : 3-4, 6-7, 13-14, 16-17, 38-37, 35-34, 28-27, 25-24 c. schematic & mechanical: o
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