IBM 3745 Series, Hardware Maintenance Reference

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If a non-productive time out occurs after the request, a report is displayed.
Local Status
┌──────────────┐
│
DCE ├─────────//─────────
└──────────┬───┘
│
│
6
Local status
When initiated on the local DCE, the following information is displayed:
Ÿ Local line status (current quality, number of hits within the last 15 mn, warnings
logged, current receive level)
Ÿ Local DTE interface status and activity.
Data traffic through the DCE is not interrupted. Normal operation take place at the
DTE interface and TI is not raised. Then this test displays line quality and received
level, until the 'STOP' key is pressed, or a 30 s time out is reached.
Any LPDA-2 command issued to the DCE from the DTE is ignored (TI is kept
OFF).
Remote Status
┌──────────────┐ ┌──────────────┐
│ DCE ├───────────//───────────┤ DCE │
└───────────┬──┘ %────── └──────────────┘
Local │ Status Remote
│
6
Remote status
When initiated on the local DCE, along with the remote DCE address, the following
information is received (within 5 s maximum) and displayed at local DCE in the
following sequence:
Ÿ Remote line status (current quality, number of hits within the last 15 mn,
warnings logged, current receive level).
Ÿ Remote DTE interface state and transition since the last request.
During execution, TI is raised, RFS and CD dropped at the local and remote DTE
interfaces, and the data traffic through the DCE is interrupted.
At local and remote DCE, DSR drops if DTR is OFF; otherwise, DSR is kept ON.
Digital Test (Transmit/Receive) for LIC Type 5
Loop test with a tributary station is performed in chopped carrier mode and half-
duplex protocol. This protocol allows different inbound and outbound speeds in the
control DCE of a multipoint network.
For each test 16 blocks (256 bytes each), are transmitted in each direction. The
blocks missed or in error, are counted as erroneous.
In point-to-point, the test is run in continuous carrier operation.
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IBM 3745 Models 130, 150, 160, 170, and 17A: Hardware Maintenance Reference