HP J Class Owner's Manual page 200

C-6
Singled-ended SCSI-2 definition limits the total cable length of
SCSI-2 cables to 6 meters (19.6 feet).
Fast, wide SCSI-3 definition limits the total cable length of SCSI-3
cables to 25 meters (82 feet).
Always use the shortest possible cable(s) for your configuration.
If you are daisy-chaining single-ended standard SCSI-2 devices to-
gether, 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 fast, wide SCSI-3 devices together, use the
following cable:
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
NOTICE: See "Determining SCSI Bus Length" later in
this Appendix to determine the total length of
your cables.