Powerful digital networks were supposed to become universal, driving up other tech sales. Instead, network overcapacity and the glacial pace of broadband's rollout have hobbled all players.


Weak computer demand has cut sales of both the operating software used to run networks and the applications programs that enable companies to use them, hurting the likes of Oracle (ORCL ) and Microsoft (MSFT ).


IBM (IBM ), Hewlett-Packard (HWP ), and Sun Microsystems (SUNW ) have seen orders for PCs, workstations, and servers slow with the slackening rollout of digital networks.


The first to feel the pain are companies such as JDS UniPhase (JDSU ) and Corning (GLW ). They make the microchips, lasers, and other parts that digital networks are made of.

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