features and specifications 1000base-t rj-45 gigabit ethernet sfp copper transceiver 74741 overview 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. molexs rj-45 sfp module provides multiple customer- friendly features. a link monitor detects loss of signals. the serial id allows individual identi?cation 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. switch board sfp adapter mac tbi serial interface seria l interfac e serdes rj-4 5 sfp host interface 1000base-t t ransceive r t r e m r o f s n a r rj-45 sfp 1000base-t application 1000base-t compliant module meets ieee802.3z, ab, u speci?cations 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 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 +70c features and bene?ts speci?cations applications networking switches routers
1000base-t rj-45 gigabit ethernet sfp copper transceiver 74741 auto-negotiation summary sfp mode when the internal gigabit ethernet transceiver (phy) is con?gured 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 con?guring 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 identi?cation is implemented on the sfp 1000base-t transceiver. the serial protocol uses a two-wire i 2c interface. software recon?gurable the sfp 1000base-t is hardware con?gured on power- up. the con?guration can be changed by a register write via a two-wire bus ( i 2c) at any time. for further details, refer to the molex sfp 1000base-t software con?guration application note. features 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 ?ow control software recon?gurable host serdes interface: differential serdes interface at 1.25 gpbs master/slave relationships serdes recovers the clock from the received data stream pause ?ow control auto-negotiation features implemented americas headquarters lisle, illinois 60532 u.s.a. 1-800-78molex amerinfo@molex.com 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 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 visit our web site at http://www.molex.com order no. usa-345 printed in usa/1.5k/ji/ji/2006.04 ?2006, molex
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