Octal-Port Copper/Fiber Fast Ethernet Transceiver

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Single-chip device containing eight independent Fast Ethernet transceivers. Each performs all the physical layer functions for 100BASE-TX full- or half-duplex Ethernet on Category 5 UTP cable and 10BASE-T full- or half-duplex Ethernet on Category 3, 4 or 5 UTP cable.
The BCM5248 chip performs encoding and decoding, clock and data recovery, digital adaptive equalization, line transmission, carrier sense and link integrity monitoring, autonegotiation and SMII/SSSMII management functions. The BCM5248 is compliant with the IEEE 802.3 standard. The BCM5248 offers alternative connection to fiber-optic modules for 100BASE-FX operation. The Enhanced FX mode allows 100BASE-FX operation without the use of Signal Detect pins. The standard FX mode allows 100BASE-FX operation with modules that require the PHY to use Signal Detect inputs to disable receive data in the absence of a received optical signal.


  • 8-port 10BASE-T/100BASE-TX/100BASE-FX transceiver
  • Cable Auto-Check diagnoses and pinpoints cable faults
  • Target usage: Fast Ethernet switches
  • Lower power per port: < 2 mW per port


  • Network Interface Cards (NICs)
  • Routers
  • Switches
  • Servers
  • Blade Servers
  • Gaming Devices

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