HFBR-5911LZ/ALZ Small Form Factor Optical Transceiver for Gigabit Ethernet (1.25 GBd) and iSCSI Data Sheet Description Features IEEE 802.3 Gigabit Ethernet The HFBR-5911LZ/ALZ optical transceiver from (1.25 Gbd) 1000BASE-SX compliant Avago Technologies is designed for use in short- reach multimode fiber optic (1000BASE-SX) links Industry standard small form factor (SFF) package between Gigabit Ethernet networking equipment. LC-duplex connector optical interface Interoperable with all equipment meeting the 850 nm Vertical cavity surface emitting laser Gigabit Ethernet industry standard, it is Internally terminated and ac coupled data IO compliant with the Small Form Factor Multi Source Agreement and requires a 3.3 V dc Extended operating temperature range (HFBR- power supply. The electrical interface follows 5911ALZ only) : the 2 x 5 format while the optical interface -10 to +85 C uses the LC-Duplex connector. Signal detect TTL Related Products Maximum link lengths: AFBR-5710LZ: 850 nm Small Form Factor Pluggable 62.5/125 m fiber 275 m optical transceiver for short reach Gigabit Ethernet 50/125 m fiber 550 m (1000BASE-SX) links Laser AEL Class 1 (eye safe) per: HDMP-1687: Quad SerDes IC for Gigabit Ethernet US 21 CFR(J) with 10 bit parallel interface and TTL clock input EN 60825-1 (+All) HDMP-1685A: Quad SerDes IC for Gigabit Ethernet +3.3 V dc power supply with 5 bit parallel interface and DDR TTL clock input HDMP-1636A/46A: Single SerDes IC for Gigabit Manufactured in ISO 9001 facilities Ethernet and Fiber Channel RoHS Compliant HDMP-1637A: Single SerDes IC with PECL RefClk Applications HDMP-1638: Single SerDes IC with PECL RefClk and Short-reach Gigabit Ethernet links Dual Serial I/O HDMP-2634: Single SerDes IC 2.5/1.25 Gigabit High speed backplane interconnects Switched backbones iSCSI applicationsOverview Tx Disable Avago Technologies HFBR-5911LZ/ALZ optical The HFBR-5911LZ/ALZ accepts a TTL transmit transceiver supports high-speed serial links over disable control signal input which shuts down the multimode optical fiber at signaling rates of up to transmitter. A high signal implements this function 1.25 Gb/s. Compliant with the Small Form Factor while a low signal allows normal transceiver (SFF) Multi Source Agreement (MSA) for 2 x 5 operation. In the event of a fault (e.g., eye safety pin LC Duplex transceivers and IEEE 802.3 circuit activated), cycling this control signal resets specification for Gigabit Ethernet (GbE) links the module as depicted in Figure 5 page 12. A (1000BASE-SX), the part is interoperable and pull-down resistor enables the laser if the line is interchangeable with other conformant devices. not connected on the host board. Supported Gigabit Ethernet link lengths are Host systems should allow a 10 ms interval described in Table 1, but the transceiver can also between successive assertions of this control signal. be used for other high-speed serial applications, Eye Safety Circuit such as iSCSI. The HFBR-5911LZ/ALZ provides Class 1 eye safety The SFF package of the HFBR-5911LZ/ALZ allows by design and has been tested for compliance designers of Gigabit Ethernet networking equipment with the requirements listed in Table 11. The eye to maximize their use of available board space. safety circuit continuously monitors optical output The footprint of the HFBR-5911LZ/ALZ is power levels and will disable the transmitter upon significantly smaller than those of other GbE detecting an unsafe condition. Such unsafe transceivers formats - 25% smaller than SFP cage conditions can be due to inputs from the host assemblies, 30% smaller than traditional 1 x 9 board (V fluctuation, unbalanced code) or faults transceivers and 70% smaller than GBIC rail CC within the transceiver. assemblies. The HFBR-5911LZ/ALZ trace keep- out area is less than 10% as large as that required Receiver Section by SFP transceivers. For applications not requiring The receiver section includes the Receiver Optical hot-pluggability, the HFBR-5911LZ/ALZ offers a Subassembly (ROSA) and the amplification/ more space-efficient package without the additional quantization circuitry. The ROSA, containing a cost and complexity imposed by pluggable PIN photodiode and custom transimpedance architecture. preamplifier, is located at the optical interface Module Diagrams and mates with the LC optical connector. The ROSA output is fed to a custom IC that provides The major functional components of the HFBR- post-amplification and quantization. 5911LZ/ALZ are illustrated in Figure 2 page 9. The external configuration of the transceiver is Signal Detect depicted in Figure 3 page 10 while the host board The post-amplification/quantizer IC also includes and front panel layouts defined by the SFF MSA transition detection circuitry that monitors the ac are shown in Figure 4, page 11. level of the incoming optical signal and provides a Transmitter Section TTL status signal to the host. An adequate optical input results in a high output while a low The transmitter section consists of the Transmitter Signal Detect output indicates an unusable optical Optical Subassembly (TOSA) and laser driver input. The Signal Detect thresholds are set so circuitry. The TOSA, containing an 850 nm that a low output indicates a definite optical fault VCSEL (Vertical Cavity Surface Emitting Laser) has occurred (e.g., disconnected or broken fiber light source, is located at the optical interface and connection to receiver, failed transmitter, etc.). mates with the LC optical connector. The TOSA is driven by a custom IC which uses the incoming differential PECL logic signals to modulate the laser diode drive current. This Tx laser driver circuit regulates the optical output power at a constant level provided that the incoming data pattern is dc balanced (8B10B code for example). 2