ECNs re-evaluate back-up systems

NEW YORK -- Electronic communications networks (ECNs) and alternative trading systems suffered a blow from the World Trade Center (WTC) attacks, but their networked nature and redundancy plans found them faring better than many of their interdealer broker customers.

The most obvious impact was on global agency-brokerage firm Instinet. The company said the destruction of its clearing operations in the WTC and loss of revenue from the equity markets' four-day halt would amount to $18 million, or $0

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