Dual 10G LAN/WAN/OTN Framer/Mapper/PHY

The Broadcom BCM84520 is a highly integrated, ultralow-power, dual-port 10G, OTN Framer/Mapper/PHY device. The BCM84520 incorporates OTN mapping/ demapping, framing/deframing, and forward error correction (FEC) encoding/decoding functions to enable high-density and low-power packet optical transport applications.The BCM84520 is built upon Broadcom"s field-proven 10G Ethernet (10GbE) PHY products with the additions of 10GbE performance monitoring and all functions required to transport 10GbE over LAN/WAN/ OTN networks. With all the OTN functions disabled by software, the BCM84520 is a LAN/WAN PHY with advanced equalization, targeted for SMF application that interface to either SFP+ or XFP modules. With OTN functions enabled by software, the device enables an Ethernet-based line card to interface to an OTN network, without the need for an extra transponder card. With these functions enabled, the device also provides longer transmission distance and robust OAM support per the ITU-T G.709 OTN standard.To ensure interoperability with the existing 10G OTN deployments, the BCM84520 integrates the standard RS (255,239) FEC code and enhanced FEC codes as specified in ITU-T G.709/G.975. In addition, the device incorporates performance monitoring and failure handling for 10GbE LAN, WIS, and OTN, according to the respective standards.To reduce board design complexity and enable lower power and cost savings, the BCM84520 integrates fractional-N clock synthesizers, as well as ultralow bandwidth jitter filtering PLLs commonly available today as discrete components. Only a single 156.25 MHz reference clock is required for either LAN, WAN, or OTN operation.

• 10GbE LAN/WAN conversion, LAN/WAN-toOTU2/2e/1e GFEC/EFEC, and OTU FEC regeneration applications.
• All G.Sup43 10G mapping modes supported:
  • Sec 6.1: WAN PHY
  • Sec 6.2: GFP-F Mapping of LAN payload into OPU2
  • Sec 7.1: Transparent mapping to OTU2e
  • Sec 7.2: Transparent mapping to OTU1e
  • Sec 7.3: Information transparent mapping
• Support for RS (255,239) Generic FEC and Enhanced FECs.
• Support for 10GbE RMON performance monitoring statistics.
• On-chip OTN overhead performance monitoring, including SM, PM and TCM1-6, and optional overhead add/drop channels.
• OTU2 with no FEC on the system side for FEC codec applications.
• Protocol-agnostic pass-through mode.
• Wide range of data range support: 9.9G to 11.4G.
• Built-in FracN synthesizers to enable a single lowcost 156.25 MHz oscillator for FEC-on and FEC-off operation.
• Integrated low-bandwidth, low-phase noise,jitter-filtering PLLs.
• Separate recovered line clocks for Sync-E support.
• Advanced diagnostics on high-speed I/Os, including eye monitor and BER monitor.
• Built-in unframed or OTN-framed PRBS generators and checkers.
• MDIO or SPI register access interface.
• Ultralow power dissipation.