The FNK-ER12x singlemode optical fiber transceivers provide low profile, cost
effective solutions for Gigabit Ethernet and 1x Fiber Channel optical fiber data
links, up to 55 km distance using 0.25 dB/km singlemode cable, with a duplex LC
connector interface. These transceivers are fully compliant with the IEEE Gigabit
Ethernet and ANSI 1x Fiber Channel standards but can be used for any other data
communications purpose within their operating parameters.
This transceiver consist of transmitter and receiver functions combined in a Low
Profile RJ module. The optical transmitter is a high output 1550nm DFB laser. The
transmitter input lines are driven with differential LVPECL signals applied to the
Transmit (TX+ and TX-) pins. These signals are internally converted to a suitable
modulation current by a CMOS integrated circuit. The optical transmitter can be
disabled by applying an LVTTL signal to the Transmit Disable (TDIS) pin.
The optical receivers consist of PIN and Preamplifier assemblies and CMOS
limiting post-amplifier integrated circuits. Outputs from the receivers consist of
differential CML data signals on the Receive (RX+ and RX-) pins and a single
ended LVTTL loss of signal function on Loss of Signal (LOS) pin. The RX data
is squelched (JAM) upon LOS Assert to prevent garbage data output when no
optical signal is present.

Features & Benefits
• Gigabit Ethernet and 1x FC Applications, up to 55 km
• 3.3 V, 1550 nm, DFB, Singlemode
• Front load pluggable miniature transceiver
• MSA height, but half the footprint
• MSA compliant Digital Diagnostics
• Surface Mount I/O pins for high speed signal integrity
• Industrial Temp Range, Vibration tolerant design
• Individual (separate) +3.3 V power supply per port
• Industry standard duplex multimode LC receptacle
• Full compliance to IEEE and ANSI requirements
• EN-60825 / IEC-825 / CDRH Class 1 Compliant