Digital Equipment StorageWorks UltraSCSI DS-BA370 Series, User Manual

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Single-Ended I/O Modules
5–6 UltraSCSI RAID Enclosure
TERMPOWER Errors
The I/O module displays the TERMPOWER status for both the internal and
the external bus (see Figure 5–4).
Figure 5–4 I/O Module TERMPOWER LEDs
CXO5829A
External
TERMPOWER Internal
TERMPOWER
The nominal TERMPOWER for both buses is +5 V dc.
•
The green internal and external TERMPOWER LEDs are O
N
during
normal operation.
•
Whenever there is a TERMPOWER overcurrent condition or there is no
TERMPOWER, the associated LED is
O
FF
.
See Table 5–1 for possible causes of TERMPOWER problems.
Table 5–1 TERMPOWER Problems
TERMPOWER Error Possible Causes
Internal I/O module
Power supply
External I/O module
Power supply
External SCSI bus cable
Removing an I/O module disconnects the SCSI bus termination. The result
is there is no TERMPOWER available to the internal SCSI bus and the bus
cannot function correctly.