Electrical Interfaces
EMI Immunity
The HFBR-5911LZ/ALZ interfaces with the host circuit Due to its shielded design, the EMI immunity of the HFBR-
board through the ten I/O pins identified by function in
Tableꢀ4.ꢀꢀTheseꢀpinsꢀareꢀsizedꢀforꢀuseꢀinꢀboardsꢀbetweenꢀ
0.062ꢀin.ꢀandꢀ0.100ꢀin.ꢀthick.ꢀꢀTheꢀboardꢀlayoutꢀforꢀthisꢀ
interfaceꢀisꢀdepictedꢀinꢀFigureꢀ4.ꢀꢀꢀ
5911LZ/ALZ exceeds typical industry standards.
Electromagnetic Interference (EMI)
Equipment incorporating Gigabit transceivers is typically sub-
jectꢀtoꢀregulationꢀbyꢀtheꢀFCCꢀinꢀtheꢀUnitedꢀStates,ꢀTUVꢀinꢀtheꢀ
EuropeanꢀUnionꢀandꢀVCCIꢀinꢀJapan.ꢀꢀTheꢀHFBR-5911LZ/ALZ’sꢀ
compliance to these standards is detailed in Table 11.
The HFBR-5911LZ/ALZ transmit and receive interfaces
requireꢀPECLꢀdifferentialꢀsignalꢀlinesꢀonꢀtheꢀhostꢀboard.ꢀꢀToꢀ
simplify board requirements, transmitter bias resistors and
ac coupling capacitors are incorporated into the transceiver
module and so are not required on the host board.
The metal housing and shielded design of the HFBR-
5911LZ/ALZ minimize the EMI challenge facing the
equipment designer.
The Tx_Disable and Signal Detect lines require TTL lines on
the host board if they are to be utilized. The transceiver will
operate normally if these lines are not connected on the host
board.
Flammability
The HFBR-5911LZ/ALZ optical transceiver is made of metal
and high strength, heat resistant, chemical resistant and
ULꢀ94V-0ꢀflameꢀretardantꢀplastic.
Figure 2 depicts a recommended interface circuit to link the
HFBR-5911LZ/ALZ to the supporting physical layer ICs.
Caution
Timing for the MSA compliant control signals implement-
ed in this transceiver are listed in Table 9 and diagramed
in Figure 5.
There are no user serviceable parts nor any maintenance
required for the HFBR-5911LZ/ALZ. All adjustments are
made at the factory before shipment. Tampering with,
modifying, misusing or improperly handling the HFBR-
5911LZ/ALZ will void the product warranty. It may also
result in improper operation and possibly overstress the
laserꢀsource.ꢀꢀPerformanceꢀdegradationꢀorꢀdeviceꢀfailureꢀ
may result. Connection of the HFBR-5911LZ/ALZ to a
light source not compliant to the Gigabit Ethernet speci-
ficationꢀ(IEEEꢀ802.3),ꢀoperatingꢀaboveꢀtheꢀrecommendedꢀ
absolute maximum operating conditions or in a manner
inconsistent with it’s design and function may result in
exposure to hazardous radiation and may constitute
an act of modifying or manufacturing a laser product.
Person’sꢀperformingꢀsuchꢀanꢀactꢀareꢀrequiredꢀbyꢀlawꢀtoꢀ
recertify and re-identify the laser product under the pro-
visionsꢀofꢀU.S.ꢀ21ꢀCFRꢀ(SubchapterꢀJ).
PCB Assembly Process Compatibility
The HFBR-5911LZ/ALZ is compatible with industry-
standard wave solder and aqueous wash processes as
detailed in Table 10. The transceiver is shipped with a
process plug to keep out impinging liquids, but is not
intended to be immersed. After assembly, the process
plug should be kept in place as a dust plug when the
transceiver is not in use.
Regulatory Compliance
The HFBR-5911LZ/ALZ complies with all ap-
plicable laws and regulations as detailed in
Table 11. Certification level is dependent of the overall
configuration of the host equipment. The transceiver
performance is offered as a figure of merit to assist the
designer.
Electrostatic Discharge (ESD)
The HFBR-5911LZ/ALZ is compatible with ESD levels found
in typical manufacturing and operating environments as de-
scribed in Table 11. In the normal handling and operation of
optical transceivers, ESD is of concern in two circumstances.
The first case is during handling of the transceiver prior to
soldering onto the host board. To protect the device, it’s
important to use normal ESD handling precautions. These
include using grounded wrist straps, workbenches and floor
mats wherever the transceiver is handled.
The second case to consider is static discharges to the exterior
of the host equipment chassis after assembly. If the optical
interface is exposed to the exterior of the host equipment
cabinet, the transceiver may be subject to system-level ESD
requirements.
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