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74741-0002 Folha de dados(PDF) 2 Page - Molex Electronics Ltd.

Nome de Peças 74741-0002
Descrição Electrónicos  1000Base-T RJ-45 Gigabit Ethernet SFP Copper Transceiver
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Fabricante Electrônico  MOLEX [Molex Electronics Ltd.]
Página de início  http://www.molex.com
Logo MOLEX - Molex Electronics Ltd.

74741-0002 Folha de dados(HTML) 2 Page - Molex Electronics Ltd.

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SFP 1000BASE-T RJ-45 FEATURES
SFP Mode
When the internal Gigabit Ethernet transceiver (PHY)
is configured to SFP mode, the PHY interfaces directly
with the host serial/deserial (SERDES) interface. The
host interface transmits and receives serial data
differentially at 1.25Gbps. The copper interface is full
featured and advertises full/half duplex, and
1000Base-T wire speed.
Auto-Negotiation
The CAT-5 copper link negotiates according to the IEEE
802.3 Clause 28, and the SERDES interface negotiates
using Clause 37. The two interfaces advertise
1000Base-T full-duplex, and master/slave
relationships. The master establishes the time control
from its local clock source. The slave however recovers
the clock from the received data stream. The SFP
application is limited to 1000Base-T wire speed only.
Auto-Negotiation on the SERDES link is always
restarted when a change is detected on copper link.
The SFP 1000Base-T features a Serial Interface
(SerDes) Auto-Negotiation Bypass mode. This mode
disables auto-negotiation after 200ms of unsuccessful
attempts with the host, without the need for manually
configuring the auto-negotiation parameters. The
Molex SFP 1000Base-T module will transmit data with
auto-negotiation disabled.
Automatic MDI Crossover
The SFP 1000Base-T transceiver performs a MDI
crossover during Auto-Negotiation eliminating the
need for crossover cables or cross-wired (MDIX) ports.
Automatic Polarity Correction
Should the polarity of receive signals inadvertently
become reversed, the SFP 1000Base-T will
automatically correct them based on the sequence of
idle signals received
Auto Power Savings Mode
When the copper link is lost, the SFP automatically
enters a low power mode reducing the chip power
requirements. Full power mode resumes once the
copper link is re-established.
Serial ID
Serial identification is implemented on the SFP
1000Base-T transceiver. The serial protocol uses a
two-wire I2C interface.
Software Reconfigurable
The SFP 1000Base-T is hardware configured on power-
up. The configuration can be changed by a register
write via a two-wire bus (I2C) at any time. For further
detail, refer to the Molex SFP 1000Base-T software
configuration application note.
1000Base-T RJ-45 Gigabit
Ethernet SFP Copper
Transceiver
74741
AUTO-NEGOTIATION SUMMARY
Auto-Negotiation Features Implemented:
General:
SERDES Auto-Negotiation is restarted when a change
is detected on the copper link
Auto power savings mode when copper link is lost
Copper RJ-45 Interface:
Auto-Negotiation
Copper SFP speed 1000Base-T
Full duplex
Automatic MDI Crossover
Master/slave relationships
Pause flow control
Software reconfigurable
Host SERDES Interface:
Differential SERDES interface at 1.25Gpbs
Master/slave relationships
SERDES recovers the clock from the received data
stream
Pause flow control


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