Ethernet switch market leader Cisco, which earlier this week , saw its revenue jump 19% sequentially in Q4.

In enterprise routers, Cisco's unit share decreased by one point, while the company's revenue share increased by a point in 2009, Infonetics found.

Overall, worldwide enterprise router revenue was down 28% to just over $3 billion in 2009.

3Com was the only vendor to increase enterprise router revenue in 2009, Infonetics found.

Sequentially, Q4 router revenue was up 10% over Q3 to $821 million. Infonetics concludes that enterprise router sales are beginning to stabilize, with sales growing again sequentially and year-over-year declines shrinking.