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TM1250HSB1 Datasheet(PDF) 2 Page - Pulse A Technitrol Company |
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TM1250HSB1 Datasheet(HTML) 2 Page - Pulse A Technitrol Company |
2 / 12 page Technical description Copperhead ™ fibre channel transceiver line interface modules (LIM) take differential ECL level NRZ data signal from the available fibre channel (or Gigabit Ethernet) silicon. The signal is then converted to drive level, pre-conditioned with an output filter, and transmitted over the cable through an interfacing wideband pulse transformer. The transformer converts the signal to current and voltage levels, with exceptionally low transmit jitter, suitable for transmission on STP, twinax or coaxial cable. The trans- ceiver matches the impedance of both the ECL circuit and the cable plant, providing a resultant output signal with minimum jitter and return loss. The receiver portion of the transceiver LIM takes the signal from the media cable and equalizes it by using a unique wideband pulse transformer and circuitry. This initi- ates the conversion process of reducing the composite signal to ECL level NRZ for the next level fibre channel silicon. Benefits of transformer coupling The pulse transformers used in Copperhead ™ transceiver LIMs provide high isolation and optimum damping of transients. They also eliminate DC components in the signal and provide common mode signal rejection. The transformer is also used to match the load to the source and provide maximum power transfer, and also to prevent reflections from transmission line effects. (Figure 1) Actual oscilloscope tracing of 1.0625 Gb/s unequalized input to receiver pins 13 and 14 after transmission over 30 meters of twinax cable. (Figure 2) Tracing of the same signal after equalization. Receiver output measured at pins 2 and 3. BEFORE (unequalized) AFTER (equalized for Fibre Channel) TWO PEARL BUCK COURT BRISTOL, PA 19007-6812 TEL 215-781-6400 FAX 215-781-6403 www.pulsespecialty.com Fibre Channel Module — 2 PULSE SPECIALTY COMPONENTS |
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