Page 264 of 504 M3900 Flash Download553-3001-367 Standard 3.00 August 2005downloads. However, there is no impact to call processing, since callprocessing has a higher priority. Therefore, downloads take longer duringpeak traffic times because the system processor is busy doing call processingand cannot devote as much time to the M3900 downloads. There is nodifference between Large Systems and Small Systems for this.When a system is first brought into service with M3900 telephones, there is asignificant amount of messaging that occurs to activate the telephonesthrough the Lamp Audit background routine. The time required to bring alltelephones into service on a system is dependent on the system configuration,and could take several hours. Performing a Flash Download directly after thesystem is brought into service adds to the message load on the system.Therefore, it is recommended that M3900 telephone download activities notoccur in conjunction with systems being brought into service. Insteaddownloads should occur 24 hours after a system is brought into service.If a user attempts to use a telephone during a flash download, all telephoneactivity is ignored.When performing a flash download to an M3900 port that does not have atelephone installed, or downloading to an M3900 port that has the wrongM3900 telephone type installed, an SDL2110 error message is printed out atthe system.During the middle of flash download operation, if the telephone isdisconnected or if the telephone fails download for any reason, the telephoneis rendered inoperable. Flash downloading must run to completion before thetelephone can be made operable.For the manual individual download operation, if the telephone is notresponding (is not operational) or if the telephone is not a M3900 telephone,flash download fails.If the firmware file(s) used as the source for flash download to M3900telephones are not present (in the proper location) on the system disks, theflash download operation fails.While a system-wide flash download operation is in progress, attempts todisable telephones that are currently being downloaded result in an SCH1958message that is printed with the list of telephones involved. If a loop, shelf, or
