OCEANPORT, N.J. -- According to a new study released today by RHK, a leading market research firm with headquarters in San Francisco, Tellium (NASDAQ: TELM), will increase its market share of the global optical core switching (OCS) market in 2001 by more than 50 percent from a year ago. According to the study, Ciena will maintain its leadership in the estimated $465 million worldwide optical core switching equipment market, with a market share of 46 percent, dropping from 60 percent a year ago. Tellium is second in market share, and will own 29 percent of the market, an increase of 10 points of market share, or 53 percent growth compared to its 19 percent share a year ago. Tellium was the only company in the study to see double-digit market growth with nearly a ten-fold increase in projected annual revenues. "This study divides the optical core switching market into three different segments -- edge grooming at STS-1 levels, core grooming at STS-48 levels and pure photonic switching," said Dana Cooperson, director of optical transport with RHK. "We see different leaders emerging in each of these segments. Tellium is the leader in the core grooming segment and the only vendor shipping core grooming switches." Tellium Inc. RHK Inc.