TITLE

What About Line Cards?

PUB. DATE
October 2004
SOURCE
Business Communications Review;Oct2004, Vol. 34 Issue 10, p46
SOURCE TYPE
Trade Publication
DOC. TYPE
Article
ABSTRACT
This article reports that the change needed in enterprise switch/routers will require analogous changes in line cards found in PCs, SANs, and WANs. Line cards in PCs and servers operate as communications interfaces, in which information generated by an application-level program or Web can be transmitted to/from another end device. When an application program wants to transmit to another machine, it contacts the operating system kernel in the origin machine. Since the microprocessor is multitasking a variety of functions in addition to message transmission, there necessarily will be frequent interrupts, with the information stored in memory buffers, until the microprocessors is ready to perform the necessary operations. Since there may be delays in receiving positive acknowledgments from end devices, line cards typically have additional memory buffers for packets waiting to be sent over the network. Different generations of PC and server line cards use different architectures for switching transmission to/from different ports.
ACCESSION #
14728309

 

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