Communications products firm

Brooktrout

(BRKT)

sank $6.75, or 23.9%, to $21.50 by early afternoon.

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The fall followed a press release this morning saying that the company was opening a $2.5 million line of credit for

Interspeed

(ISPD)

, a DSL equipment maker in which Brooktrout owns a 56% stake. The company said the credit is intended to help Interspeed meet its short-term liquidity needs. Interspeed recently announced disappointing results.