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Other Installation Issues 27
6-00020-02
SNC 5100
SCSI Bus Termination
Each end of a SCSI bus must be terminated correctly. The SNC 5100 provides
termination on each of its buses. The terminators can be disabled using a
jumper on the SNC 5100 motherboard.
The terminators can also be enabled or disabled from the ADIC Management
Console. For more information on SCSI Channel configuration, see the ADIC
Management Console User Guide.
Caution
Improper SCSI bus termination may result in excessive errors on the SCSI bus,
and may lead to data corruption or the inability to communicate with target
devices.
The SNC 5100 provides termination power on all SCSI buses for external
terminators.
Many SCSI target devices have internal terminators. It is imperative that the
terminators be disabled for all devices EXCEPT those at the physical ends of
the SCSI bus.
Problems on the SCSI Bus
When a SCSI bus fails to operate correctly, it is most often caused by incorrect
connections to the SCSI bus. Common problems include:
Notes:
1
The listed maximum bus lengths may be exceeded in Point-to-Point and engineered applications.
2
Use of the word "Narrow", preceding SCSI, Ultra SCSI, or Ultra2 SCSI is optional.
3
Single-ended is not defined for speeds beyond Ultra.
4
Not defined for speeds beyond Ultra2.
5
After Ultra2 all new speeds are wide only.
Table 5: SCSI Trade Association Terminology