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TM1485FUB1 Datasheet(PDF) 2 Page - Pulse A Technitrol Company

Part # TM1485FUB1
Description  Fibre Channel transceiver line interface module
Download  12 Pages
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Manufacturer  PULSE [Pulse A Technitrol Company]
Direct Link  http://www.pulseeng.com
Logo PULSE - Pulse A Technitrol Company

TM1485FUB1 Datasheet(HTML) 2 Page - Pulse A Technitrol Company

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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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