Shares of

Efficient Networks

(EFNT)

initially fell sharply a day after the company

warned that second-quarter revenue wouldn't meet previous expectations, but the stock rebounded in midday trading.

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Shares of the broadband access company recently gained 22 cents, or 2.7%, to $8.50 in

Nasdaq

trading, coming off the low of $7.75. The 52-week low is $10.75, and the high for the year is $186.81.

Deutsche Banc Alex. Brown

downgraded Efficient Networks today to a buy from a strong buy and cut its 2001 earnings estimate to 10 cents a share from 80 cents.

Robertson Stephens

also cut Efficient's earnings estimate and downgraded the stock to long-term attractive from buy.

Several other broadband stocks saw downgrades from Robertson Stephens. Among them were

Copper Mountain

(CMTN)

,

Paradyne

( PDYN) and

Tut Systems

( TUTS).

Copper Mountain recently traded down 78 cents, or 14.4%, to $4.66. Paradyne gained 9 cents, or 4.9%, to $2.06, and Tut lost 47 cents, or 6.1%, to $7.16.