Section 4. Loopback; Section 6. Status; Section 10. Verification Trouble Tree; Section 11. Diagnostic Trouble Tree - HP 27115A Installation Manual

Section 4. LOOPBACK
This section provides various forms of loopback test (some of which are
destructive), including:
• HP-FL
device adapter loopback: verifies data path between the
CIO
bus
and the
HP-FL PCA
(this test is non-destructive),
• Link device loopback: verifies the data path between the
HP-FL PCA
RAM
and the remote device controller directly connected to the
HP-FL
cable (this test is non-destructive),
• Target device loopback: verifies the data path between the
PCA
and the target device controller (e.g., over the PBus) (this test is
non-destructive),
• HP-FL
interface internal Loopback: verifies the data path completely
internal to the
HP-FL PCA
(this test is destructive),
• HP-FL
externalloopback: verifies the data path internal and external to
the
HP-FL PCA
(a loopback cable is required) (this test is destructive).
Section 6. STATUS
This non-destructive section reports the hardware status from the
HP-FL PCA.
Section 10. VERIFICATION TROUBLE TREE
This non-destructive section proceeds through a series of tests to check the
communication path from the host computer to the peripheral devices. See the
summary below.
Section 11. DIAGNOSTIC TROUBLE TREE
Although similar to section 10, this section is more exhaustive and runs in
destructive mode. See the summary below.
3-8 Troubleshooting and Diagnostics