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In the original " tet-off " system , the switch stayed in the " on " position in the absence of the drug . Therefore , if the number of processors exclusively available to an example program is less than the number of parallel processes used in the example program ( which is four in most cases ) , the switch ` - slt ' has to be chosen . One key benefit of this architecture as compared to a proprietary switch is that because the signaling software on the NIC is completely standards based , any switch developed with this technology can be seamlessly integrated with any other , similarly open , platform . If the master should fail or be disconnected , another switch can take over as master and routing will continue uninterrupted , Hill said . The external puck includes two serial ports , FLASH memory , a switch , and microprocessor to interpret and execute puck protocol commands specified by a host . For example , if a frame is tagged as part of an e-mail message , a switch would know that it is perfectly acceptable to delay this frame , but also that it should probably not be discarded . In case of a facilities-based wireline carrier , where an owned or controlled network is the basis of entry , it will need access to local rights-of way ( ROW ) , conduit , dark fiber , a switch , and co-location opportunities as the fundamental elements of a telecommunications network . Issues with network design are dealt with , and readers are taught the difference between a hub , a switch and a router . Thus , in a lightweight context switch , the switch to the interrupt thread does not switch vmspaces but borrows the vmspace of the interrupted thread . By this sy.tem , with one movement of the main bar , the switch is un - locked , moved , and then locked again in its new position , - the advantage of the system consist - ing in the use of only one lever and main rod connectingc the switch wvi th the switch-tovwer . As with RERTR 's fuel-conversion program , the switch to LEU targets should be phased in as substitutes are developed , and no new facilities should be built to use HEU .