POFLink's X2 is a standardized factor for 10 Gb/s fiber optic transponders that is used for data transfer rates 10.3 Gb/s to 10.5 Gb/s. It is protocol-specific: Either 10G Ethernet or 10G Fibre Channel versions are available. X2 transponders are used in datacom optical links only (not telecom), and they are smaller than old generation XENPAK transponders. Its electrical interface to the host board is also standardized and is called XAUI (4 x 3.125 Gb/s).

POFLink manufactures X2-10G-SR 300m, X2-10G-LR 10km, X2-10G-ER 40km, X2-10G-ZR 80km optical modules. All modules support Digital Optical Monitoring (DOM) function .

Hot pluggable X2 MSA form factor
Low total power consumption:
Transmission distance 300m, 10km, 40km, 80 km
Cooled 1550nm EML or Uncooled directly modulated Distributed Feedback (DFB)
Full duplex transmission mode
Digital Optics Monitoring (DOM)
Power supply: +5.0 V, +3.3 V
XAUI electrical interface 4 x 3.125 Gb/s Ethernet(FTLX1841E2)

X2 10GBase-SR 10-Gigabit Ethernet X2-10GB-SR
X2 10GBase-LR 10-Gigabit Ethernet X2-10GB-LR
X2 10GBase-ER 10-Gigabit Ethernet X2-10GB-ER
X2 10GBase-ZR 10-Gigabit Ethernet X2-10GB-ZR