IBM 3745 Series, Hardware Maintenance Reference

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Initial Status = B'111' (Hardware Error):
Detailed descriptions of hardware errors:
┌─────────────────────┬──────────────────────────────────────────────┐
│ ISF
FSF F │ │
│ │ │
│ ð 1 2 3 4 5 6 7 │ Meaning │
├─────────────────────┼──────────────────────────────────────────────┤
│ 1 1 1
ð ð ð 1 x │ CTS dropped during command/modem retrain │
│ 1 1 1 ð ð 1 1 x │ RLSD failed to drop on disable command │
│ │ (not used by NCP) │
│ 1 1 1 ð 1 1 1 x │ DSR dropped during command/ external clock │
│ │ error (F5) │
│ 1 1 1 1 ð ð 1 x │ TI/CTS failed to come up │
│ 1 1 1 1 ð 1 ð x │ DSR failed to come up │
│ 1 1 1 1 ð 1 1 x │ No cable installed or wrong cable │
│ 1 1 1 1 1 ð ð x │ TI/DSR and/or CTS failed to drop (on disable │
│ │ and transmit data commands on half-duplex │
│ │ lines without duplex facilities │
│ 1 1 1 1 1 ð 1 x │ X.21 disconnected DCE clear receive, with │
│ │ or without timeout │
│ 1 1 1 1 1 1 ð x │ Autocall check │
└─────────────────────┴──────────────────────────────────────────────┘
Notes:
1. For NCP operations, the line is set to the disable state.
2. For NCP operations on duplex lines, the command on the failed interface is ended; the LCS indicates
the cause of the error, and a level 2 interrupt is raised to the CCU. The command on the other
interface is cleared; no ending status is set, and no interrupt is raised to the CCU.
3. For EP operations, the line is set to the NO-OP state.
4. After hardware error, the only commands accepted for that line is 'enable', 'monitor incoming call', or
'dial' (if autocall interface).
Initial Status = B'111' (Hardware Error HSS):
The code is the value of the LCS bits 0 to 7
(fields ISF, FSF, F).
Code Description
E2 CTS dropped indicates clear to send failed during transmission.
EE V.35 DSR dropped/X.21 DCE not ready, or external clock failure indicates that DSR failed for V.35
connection, or that the DCE is not ready for an X.21 connection in response to an F5 command.
F2 CTS failed to come up. Clear to send did not rise after request to send was set.
F4 DSR failed to come up. Data set ready did not rise after data terminal ready was set.
F6 No cable installed. There is no cable connected to the modem.
F8 DSR/CTS failed to drop on a disable. On a disable command, data set ready or clear to send did
not drop.
FA X21 DCE not ready. An X.21 DCE not ready state was detected.
Note: In all cases of internal box errors and hardware errors, the line is disabled by the CSP. The
command on the failed interface is ended (LCS contains the error and a level 2 interrupt request is raised
to the CCU).
The command on the other interface is cleared without any ending status or level 2 interrupt request to the
CCU.
After such an error the only commands that are accepted on the line are 'set mode' or 'enable'.
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IBM 3745 Models 130, 150, 160, 170, and 17A: Hardware Maintenance Reference