Gennum and Altera demonstrate 4 x 25 Gb/s ICs for 100 Gb/s networks
The demonstration featured Gennum’s GN2425 and GN2426 module clock and data recovery (CDR) integrated circuits communicating with an Altera linecard/host-based Stratix® V GT FPGA operating at 25 to 28 Gb/s over an OIF CEI-28G-VSR compliant electrical link. The link has greater than 10 dB of loss at the Nyquist data rate and is comprised of host board traces, module board traces and a Molex zQSFP+ interconnect system. The link exceeds the CEI-28G-VSR IA requirements and is able to operate at a bit-error-rate (BER) of less than 1E-15.
As global Internet traffic is expected to multiply over the coming years, significantly more bandwidth will be required, driving the need for large-scale network upgrades. The GN2425 and GN2426, now in pre-production, are designed to support 25 to 28 Gb/s data streams for next-generation 100 Gb/s pluggable fiber-optic modules, line cards and direct-attach copper cables using the 25G-QSFP+ and CFP2 form factors. They provide exceptional jitter performance with low power consumption.
By resetting the jitter budgets within the module in both the transmit and receive directions, Gennum’s CDRs enable robust operation for new systems such as 100GBASE-LR4 optical modules. In the transmit direction they drive EML, DML or MZM drivers with very low jitter, allowing clean, wide-open transmit eyes. In the receive direction they remove jitter from the recovered optical signals, promoting error-free reception by a downstream receiver on the host board. The GN2425 and GN2426 CDRs include the equalization capability demanded of the new CEI-28G-VSR IA, providing a robust VSR link.
Altera’s high-performance Stratix V GT FPGAs are tailored to support the most bandwidth-intensive communications systems. Featuring 28 Gb/s integrated transceivers, Stratix V FPGAs deliver the high system bandwidth at the lowest power consumption, under 200 mW per channel at 28 Gb/s. Stratix V GT FPGAs support backplane, optical module and chip-to-chip applications through four 28 Gb/s transceivers, and 66 full-duplex 14.1 Gb/s transceivers.