The  (Vita57.1) compliant HTG-4RJ45 FMC  module provides access to four RJ45 connectors through Microchip Quad family of single-chip device (VSC8574XKS) with four independent Gigabit Ethernet transceivers.

Main features of VSC8574 device:

• Four integrated 10/100/1000BASE-T Ethernet copper transceivers (IEEE 802.3ab compliant) with VeriPHY™ cable diagnostics
• Four dual media copper/fiber ports with unidirectional IEEE 802.3ah support
• SGMII and QSGMII SerDes MAC interface
• Patented line driver with low EMI voltage mode and integrated line side termination resistors
• HP Auto-MDIX support
• Integrated AC-coupling capacitors for SGMII interface
• Jumbo frame support up to 16 kB with programmable synchronization FIFOs

Advanced Carrier Ethernet Support
• Recovered clock outputs with programmable clock squelch control and fast link failure indication (<1 ms) for G.8261 SyncE applications
• Supports IEEE 1588v2 timestamp packet correction
• Flexible transmit and receive frequency timing per PHY port
• 1000BASE-T ring resiliency for switching between master/slave timing while maintaining link up integrity
• Integrated quad I2C mux to control SFP and PoE modules
• Supports IEEE 802.3bf timing and synchronization