FEATURES AND SPECIFICATIONS
1000Base-T RJ-45 Gigabit
Ethernet SFP Copper
Transceiver
74741
The 1000Base-T RJ-45 Gigabit Ethernet SFP copper
transceiver module is a high-performance integrated
duplex data link for bi-directional communication over
Category 5 copper cable. The hot-pluggable feature
allows changing to and from another SFP-compatible
module without having to remove system power. Serial
ID is included.
Molex’s RJ-45 SFP module provides multiple customer-
friendly features. A link monitor detects loss of signals.
The Serial ID allows individual identification of each
SFP transceiver. An auto-power saving mode conserves
energy. The centered RJ-45 modular jack conforms to
a 1U rack for ease of installation, and its design allows
side-by-side stacking for increased density.
Features and Benefits
■
1000Base-T compliant module meets IEEE802.3z,
ab, u specifications and is SFP MSA compliant
■
Less than 1 Watt power requirement provides low
heat output
■
Zinc backshells provide improved EMI
performance
■
Auto-negotiation feature allows networking
equipment to automatically determine and adjust
to the required settings
■
Automatic MDI crossover eliminates the need for
crossover cables or cross-wired (MDIX) ports
■
Bail latch provides ease of extraction
Specifications
Reference Information
Packaging: Box
Mates with: SFP Cage 73927
SFP Connector 74441
Electrical
Voltage: 3.3V
Current: 285mA
Power: 1 W max.
Physical
Diecast Backshell: Zinc
PCB Thickness: .099mm (.039”)
Operating Temperature: 0 to +70°C
Applications
■
Networking
■
Switches
■
Routers
OVERVIEW
Switch Board
SFP Adapter
Transformer
MAC
TBI
SERDES
Serial
Interface
SFP Host
Interface
Serial
Interface
RJ-45 SFP 1000Base-T Application
1000Base-T
Transceiver
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 1.25 Gbps. The copper interface is
full featured and advertises full/half duplex, and
1000Base-T wire speed.
Auto-Negotiation
The Category 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
details, 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 1.25 Gpbs
■
Master/slave relationships
■
SerDes recovers the clock from the received data
stream
■
Pause flow control
Americas Headquarters
Lisle, Illinois 60532 U.S.A.
1-800-78MOLEX
amerinfo@molex.com
Order No. USA-345
Far East North Headquarters
Yamato, Kanagawa, Japan
81-462-65-2324
feninfo@molex.com
Far East South Headquarters
Jurong, Singapore
65-6-268-6868
fesinfo@molex.com
Visit our Web site at http://www.molex.com
Printed in USA/1.5K/JI/JI/2006.04
European Headquarters
Munich, Germany
49-89-413092-0
eurinfo@molex.com
Corporate Headquarters
2222 Wellington Ct.
Lisle, IL 60532 U.S.A.
630-969-4550
Fax:630-969-1352
©2006, Molex
ADI Reference Circuit
京公网安备 11010802033920号
EEWORLD
