Finisar's 1000BASE-T SFP transceivers are SFP RJ45 modules, wihch depend on the SFP Multi Source Agreement (MSA). Additionally, these are appropriate for Gigabit Ethernet and 1000BASE-T standards as specified in IEEE Std. 802.3:2002. FCxx-8520/8521-3 is its product model, which includes four goods, ie. FCMJ-8520-3, FCMJ-8521-3, FCLF-8520-3 and FCLF-8521-3. Most of the time, both are 1000BASE-T SFPs and also have the similar functions. However, there is several difference between them which you can distinguish via the difference in the model, like FCMJ and FCLF, the 8520 and 8521. This paper will discuss the difference between them.
What Does 1000BASE-T Mean?
Before we begin to discuss the main difference between the FCxx-8520/8521-3 SFPs, we first know the "1000BASE-T". 1000BASE-T is defined in IEEE802.3:2002. The "1000" in the designation means the transmission speed of 1000 Mbps. The "BASE" refers to BASE band signaling, indicating that only Ethernet signals are carried on the medium. The "T" represents twisted-pair copper cable (as an example Cat 5). Therefore we offer called this type of transceivers as the copper transceivers. If the "T" is replaced by the "X", it represents fiber optic cable.
What Is The Difference Between The FCxx-8521-3 & The FCxx-8520-3?
The FCxx-8521-3 was designed to be a 1000BASE-X compliant device that functions properly in any slot made for optical SFP's, without any software or hardware changes to the host system. The PHY is configured to perform 1000BASE-X auto-negotiation with the host system. The FCxx-8521-3 does not have to link detection circuitry the RxLOS pin is internally grounded. The FCxx-8520-3 is much like the FCxx-8521-3, however the 1000BASE-X auto negotiation is disabled. Because of this device to control, auto-negotiation also need to be disabled in the host system. Within the FCxx-8520-3, the RxLOS pin functions as a link indicator-RxLOS is asserted when the 1000BASE-T link is lost. Typically, this device is used in systems where the host cannot determine the link status without using RxLOS as a link indicator.
What Is The Main Difference Between The FCMJ-8520/8521-3 &?The FCLC-8520/8521-3?
The FCMJ-8520/8521-3 versions are RoHS 5/6 while the FCLF-8520/8521-3 versions are fully RoHS compliant.
What Cable Type Is Recommended For Use With The FCxx-8520/8521-3?
The FCxx-8520/8521-3 was designed to operate using standard Cat 5 cables that're been configured per IEEE802.3:2002. You can safely use Cat 5e or Cat 6 cables, because these are improved versions of Cat 5. For short cable runs, with an intricate routing, stranded cable is recommended, as it is more flexible.
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