Puma devices for SFP+ Applications |
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While the current interest in the new smaller 10G SFP+ modules is generated by the potential space and cost savings, there are still considerable challenges that have to be addressed before the SFP+ form factor finds widespread acceptance within the 10GbE switch and NIC markets. Main issues that need to be solved are:
- Low-cost 10G optics (driven by the SFP+ MSA technical specifications and optics supply)
- Performance of the electronic dispersion compensation (EDC) engine
The following chart shows the type of fundamental change that the emerging SFP+ modules will introduce to the architecture of the line card. As shown, the main functions of the 10G PHY, including the CDR function, the SerDes function and the electronic dispersion compensation function (EDC)—compliant with IEEE802.3aq specifications—will transition entirely to the line card and out of the optical modules. Consequently, systems designers—who until now could depend on the modules vendors to work out the complicated optical front end and simply receive an amplified, conditioned signal from the optical modules—have to deal with a whole new set of issues related to 10G serial signals. The stage is now set for a new group of IC vendors to fill the need with low-power, high performance 10G PHY devices.
For ‘Linear’1 Applications
Aeluros has focused on developing a full portfolio of EDC devices for line-card and NIC applications.
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‘Linear’ refers to the output of the ‘receive’ data path of an SFP+ module that puts out an amplified electrical signal that maintains the individual bit impairment information from a ‘linear’ ROSA (photodiode/linear TIA + AGC) stack up. |
Puma AEL2003
SINGLE CHANNEL SFI/XFI 10G CDR/EDC for SFP+ applications |
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FEATURES
- Single channel 10GbE CDR/EDC for line-cards & NICs with SFP+ modules
- Same high-performance EDC engine implemented with FFE/DFE architectures on 10G RX port
- Pre-emphasis on 10G
- EDC engine passes all stress test pulses—as defined in IEEE802.3aq
- Programmable rise/fall times
- Built-in PRBS & BER Features
- EDC engine has proven interoperability with several SFP+ vendors
Puma AEL2005
SINGLE CHANNEL XAUI/SFI LAN PHY/SerDes w/EDC for SFP+ applications |
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FEATURES
- Single channel 10GbE PHY/SerDes (10 Gbps-to-XAUI) for line-cards & NICs with SFP+ modules
- Integrated EDC engine implemented with FFE/DFE architectures on 10G RX port
- Pre-emphasis on 10G
- EDC engine passes all stress test pulses—as defined in IEEE802.3aq
- Programmable rise/fall times
- Built-in PRBS & BER Features
- Adjustable XAUI transmit pre-emphasis for 40 inches of FR4 with 1 connector
- TX pre-emphasis on XAUI interface
- Programmable bit & lane ordering
- EDC engine has proven interoperability with several SFP+ vendors
Puma AEL2006
DUAL CHANNEL SFI/XFI 10G CDR/EDC for SFP+ applications |
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FEATURES
- Dual channel 10GbE CDR/EDC for line-cards & NICs with SFP+ modules
- Same high-performance EDC engine implemented with FFE/DFE architectures on 10G RX port
- Pre-emphasis on 10G
- EDC engine passes all stress test pulses—as defined in IEEE802.3aq
- Programmable rise/fall times
- Built-in PRBS & BER Features
- EDC engine has proven interoperability with several SFP+ vendors
Puma AEL2010
DUAL CHANNEL XAUI/SFI LAN PHY/SerDes w/EDC for SFP+ applications |
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FEATURES
- Dual channel 10GbE PHY/SerDes (10 Gbps-to-XAUI) for line-cards & NICs with SFP+ modules
- Integrated EDC engine implemented with FFE/DFE architectures on 10G RX port
- Pre-emphasis on 10G
- EDC engine passes all stress test pulses—as defined in IEEE802.3aq
- Programmable rise/fall times
- Built-in PRBS & BER Features
- Adjustable XAUI transmit pre-emphasis for 40 inches of FR4 with 1 connector
- TX pre-emphasis on XAUI interface
- Programmable bit & lane ordering
- EDC engine has proven interoperability with several SFP+ vendors
For ‘Limiting’2 Applications
| For new installations of 10GbE switches & NICs in datacenters, higher bandwidth fiber (OM2 & OM3) would most likely be used. Depending on the distance requirements, 10GBASE-SR (Table below shows different options) should be sufficient. If maximum distance being planned for does not exceed 300m, then SFP+ modules with –SR optics and limiting interfaces are perfect for this application. |
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For longer distances (up to 10 km), single mode fiber can be used with –LR optics.
The Aeluros Puma AEL1010 device is a single channel CMOS physical layer
transceiver with superior CDR performance and excellent RX sensitivity.
Aeluros has tested these devices with SFP+ modules and fiber test beds to
ensure the following performance:
- 300m of OM3 fiber
- 8 inches of FR4 between the SFP+ module and the Puma AEL1010
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‘Limiting’ refers to the output of the ‘receive’ data path of an SFP+ module that puts out a quantized electrical signal from the ROSA (photodiode/TIA) + limiting amplifier stack up. |
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