iSeries Model 840 193iSeries Model 840The #9079 also supports up to two removable media devices (internal tape or CD-ROM).These removable media devices are supported by the #9778.#5101 30-Disk Expansion FeatureThe #5101 is a disk unit expansion enclosure feature for the #5074 Expansion Tower, the#9074 Base I/O Enclosure, and the #9079 Base I/O Tower. The #5101 includes two 15 diskunit enclosures, one 765-Watt power supply, backplanes and cables. One #4778 PCI RAIDDisk Unit Controller is required to support the 15 disk units in each of the two disk unitenclosures included with #5101. Two #4778 PCI RAID Disk Unit Controllers are required tosupport 30 disk units.#5111 30-Disk Expansion With Dual Line Cord FeatureThe #5111 is a disk unit expansion enclosure for systems and towers that are dual line cordenabled. It includes two 15 disk unit enclosures, backplanes, and cables. Two #4748/#4778PCI RAID Disk Unit Controllers are required to support 30 disk units.Prerequisites:• #5104 when ordered for a Model 840 system unit• #5105 when ordered for a stand alone #5074 I/O Tower or the top unit in a #8079• #5106 for the unit in a #5079 where the #5111 expansion enclosure is to be installedOS/400 V5R1 and supporting PTFs are required. Refer to Informational APAR II12950 at:http://as400service.rochester.ibm.com/supporthome.nsf/document/10000035#2730 Programmable RegulatorThe #2730 Programmable Regulator (quantity two) is required if the #3196 8 GB MainStorage Card is installed in the Model 840.#5150 Battery Backup (external)The #5150 is an external battery backup that, when used in conjunction with the internalbattery backup, is capable of extending the battery backup time on Models 840 and SB3.High Speed Links (HSL) on Model 840The Model 840 supports up to eight HSL loops two of which can be Optical HSL loops. TheOptical HSL Loop extends the distance between the 830 system unit and the I/O units fromthe current 15 meters to 250 meters which can help to improve data reliability and protection.The Optical HSL cables are smaller and easier to work with. Optical and Copper HSL cablesmay not be intermixed within a loop. These loops support the attachment of #5074 I/O Towers(with the #5079 counting as two #5074s) and certain external xSeries servers. Only #5074,
