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Use of other cables can result in significant problems with system operation. The narrow, singled-ended SCSI implemented on C160/C180/C200/C240/ C360 workstations limits the total cable length of narrow SE SCSI cables to 6 meters (19.6 feet). The fast, wide, differential SCSI definition limits the total cable length of FW SCSI cables to 25 meters (82 feet). The ultra, wide single-ended SCSI definition limits the total cable length of ultra, wide-SE SCSI cables to 3 meters (9.84 feet). Always use the shortest possible cable(s) for your configuration. If you are daisy-chaining narrow SE SCSI devices together, use the following cables: • 92222A cable with 0.5 meter (1.6 feet) length • 92222B cable with 1.0 meter (3.2 feet) length • 92222C cable with 2.0 meter (6.6 feet) length If you are daisy-chaining FWD SCSI devices together, use the following cables: • C2911A cable with 0.9 meter (3 feet) length • C2924A cable with 2.5 meter (8.2 feet) length • C2925A cable with 10.0 meter (32.8 feet) length • C2926A cable with 20.0 meter (65.6 feet) length If you are daisy-chaining ultra, wide-SE SCSI devices together, use the following cable: • C2978A cable with 0.5 meter (1.64 feet) length NOTICE See “Determining SCSI Bus Length” later in this Appendix to determine the total length of your cables. SCSI Connections SCSI Restrictions Connectors and Terminators Any narrow, SE SCSI device connecting to the system must use a 50-pin high-density thumb screw connector on the end connecting to the system board. Any fast, wide differential or ultra, wide-SE SCSI device connecting to the system must use a 68-pin high-density thumb screw connector on both ends. NOTICE The terminators for fast, wide differential SCSI and ultra, wide-SE SCSI are different and not compatible, even though the connectors are identical. It is necessary to put a terminator on empty SCSI connectors on the back panel of the system. Also, a SCSI device attached to the SCSI bus or the last external device connected to the SCSI bus must be terminated with a SCSI terminator. If you do not already have a SCSI terminator, you must order terminator C2904A (for 50-pin connectors) or C2905A (for 68-pin fast, wide differential connectors) or C2972A (for 68-pin ultra, wide-SE connectors) from Hewlett-Packard. 158 SCSI Connections SCSI Restrictions SCSI Configuration Constraints You are limited to the number of same-type SCSI devices per system. Before adding another SCSI device, determine if the system can support the additional device. This workstation offers the following types of SCSI bus, each with its own configuration constraints: • Narrow, Single-ended SCSI bus (C160/C180/C200/C240/C360) • Fast, Wide Differential SCSI bus (C160/C180/C200 upgrade) • Ultra, Wide-Single-Ended SCSI bus (C200/C240/C360 only) Narrow, Single-ended SCSI Bus Configuration Constraints For the NSE SCSI bus, HP-UX supports only one of each type of removable disk drive and two of the same type tape devices per system. Table 21 shows configuration constraints for each NSE SCSI device type. If the system has an internal CD-ROM drive or DDS tape drive, you must count them as NSE SCSI devices. Table 21 NSE SCSI Bus Configuration Constraints NSE SCSI Devices Maximum Number of Each Type of Device Allowed Hard Disk Drives (external only) 7 CD-ROM Drives (one internal) 1 4-mm DDS Tape Drives (one internal) 2 9-track Tape Drives 2 650-MB Magneto-Optical Drives 1 Magneto-Optical Autochangers (see notice below) 1 Maximum Number of NSE SCSI Devices 7 NOTICE: Magneto-Optical Autochangers use three NSE SCSI drive address. Each address must be accounted for in the maximum number of NSE SCSI devices allowed. SCSI Connections SCSI Restrictions CAUTION: Do not mix narrow, single-ended SCSI, fast, wide differential SCSI, or ultra, wide- SE SCSI peripherals on the same SCSI bus. Table 22 Fast, Wide, Differential SCSI Bus Configuration Constraints FWD SCSI does not work with either SE SCSI. Table 22 shows the configuration constraints for each FWD SCSI device type. FWD SCSI Bus Configuration Constraints FWD SCSI Devices Maximum Number of Each Type of Device Allowed FWD SCSI Disk Drive (up to 2 internal) 15 FWD SCSI Disk Arrays (addressed as single drive) 7 CAUTION: Do not mix narrow, single-ended, fast, wide differential, or ultra, wide-SE SCSI peripherals together on the same bus. Ultra, Wide-SE SCSI Bus Configuration Constraints Ultra, wide single-ended SCSI does not work with narrow, single ended or fast wide differential SCSI. Table 22 shows the configuration constraints for each ultra, wide- SE SCSI device type. Table 23 Ultra, Wide-SE SCSI Bus Configuration Constraints Ultra, Wide-SE SCSI Devices Maximum Number of Each Type of Device Allowed Ultra, Wide-SE SCSI Disk Drive (up to 2 internal) 4 Ultra, Wide-SE SCSI Disk Arrays (addressed as single drive) 1 CAUTION: Do not mix narrow, single-ended, fast, wide differential, or ultra, wide-SE SCSI peripherals together on the same bus. 160 SCSI Connections Dete...

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