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HFBR-5710L Datasheet(PDF) 3 Page - Agilent(Hewlett-Packard) |
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HFBR-5710L Datasheet(HTML) 3 Page - Agilent(Hewlett-Packard) |
3 / 15 page ![]() 3 Before extracting the module, the black plastic tab beneath the optical port must be depressed, releasing the latch mechanism. The transceiver can then be pulled out of the port manually by gripping the side of the LC ports. For easier fingertip delatching in high port density applications, an optional extended tab is offered as shown in Figure 10. Serial Identification (EEPROM) The HFBR-5710L features an EEPROM for Serial ID. It contains the product data stored for retrieval by host equipment. This data is accessed via the 2- wire serial EEPROM protocol of the ATMEL AT24C01A or similar in compliance with the industry standard SFP Multi-Source Agreement. Contents of the HFBR-5710L serial ID memory are displayed in Table 9. Transmitter Section The transmitter section includes the Transmitter Optical Sub- assembly (TOSA) and laser driver circuitry. The TOSA, containing an 850 nm VCSEL (Vertical Cavity Surface Emitting Laser) light source, is located at the optical interface and mates with the LC optical connector. The TOSA is driven by a custom IC, which converts differential logic signals into an analog laser diode drive current. This Tx driver circuit regulates the optical power at a constant level provided the data pattern is DC balanced (8B10B code for example). Tx Disable The HFBR-5710L accepts a transmit disable control signal input which shuts down the transmitter. A high signal implements this function while a low signal allows normal laser operation. In the event of a fault (e.g., eye safety circuit activated), cycling this control signal resets the module as depicted in Figure 6. Eye Safety Circuit The HFBR-5710L provides Class 1 eye safety by design and has been tested for compliance with the requirements listed in Table 1. The eye safety circuit continuously monitors optical output power levels and will disable the transmitter and assert a TX_FAULT signal upon detecting an unsafe condition. Such unsafe conditions can be created by inputs from the host board (Vcc fluxuation, unbalanced code) or faults within the module. Receiver Section The receiver section includes the Receiver Optical Subassembly (ROSA) and amplification/ quantization circuitry. The ROSA, containing a PIN photodiode and custom trans-impedance preamplifier, is located at the optical interface and mates with the LC optical connector. The ROSA is mated to a custom IC that provides post-amplification and quantization. Also included is a Loss Of Signal (LOS) detection circuit. Loss of Signal The Loss Of Signal (LOS) output indicates an unusable optical input power level. A high LOS output signal indicates a loss of signal while a low LOS output signal indicates normal operation. The Loss Of Signal thresholds are set to indicate a definite optical fault has occurred (e.g., disconnected or broken fiber connection to receiver, failed transmitter, etc.). Functional I/O The HFBR-5710L accepts industry standard differential signals such as LVPECL and CML within the scope of the SFP MSA. To simplify board requirements, transmitter bias resistors and coupling capacitors are incorporated into the transceiver module. The module is “ac- coupled” and internally terminated. Figure 4 illustrates a recom- mended interface circuit to link the HFBR-5710L to the supporting Physical Layer integrated circuits. Timing diagrams for the MSA compliant control signals implemented in this module are depicted in Figure 6. Figure 3. MSA required power supply filter. 1 µH 1 µH 0.1 µF VCCR SFP MODULE 10 µF VCCT 0.1 µF 10 µF 3.3 V HOST BOARD 0.1 µF |
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Similar Description - HFBR-5710L |
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