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v You can run the tests only on non-switched synchronous data link control
(SDLC) lines.
v For multiport DCEs, the DCEs and Line Status test does not interrupt normal
communications. The other LPDA-2 tests might interrupt normal
communications.
v You cannot run the tests on an active secondary line. A line is secondary if its
data link role is either secondary or is negotiable and has negotiated to a
secondary role. A line is active if a controller description under the line is varied
on.
The DCEs and line status and DCEs and line test options are two modes of the same
LPDA-2 request.
The DCEs and Line Status test reports parameters that the local and remote DCEs
monitor during normal communications.
The DCEs and Line Test reports these parameters, runs internal tests, and reports
the results. If poor line conditions are causing problems at normal speed, this test
is sent over the communications line to the remote DCE at a slower transmit
speed.
These two tests return the following information:
v Configuration summary
This includes DCE type and model, address, operating mode, transmit speed,
network function, LPDA-2 code level, switched network backup (SNBU) status,
data terminal equipment (DTE) interface connection, and installed features.
v DCEs and line parameters
These include receive level, number of received line signal detector (RLSD)
losses, line quality, number of line errors, ages of remote DCE power-off and
failure, ages of local DCE reinitialization and error conditions, DCE idle
condition, base DCE in error, and features in error.
v Remote DCE interface status
This reports the current status and previous activity of the signals on the DTE
interface lines attached to the remote DCE. The DCE monitors the following
signals:
– Request to send
– Ready for sending
– Transmit data
– Receive data
– Received line signal detector or carrier detect
– Data signalling rate selector
– Data terminal ready
– DTE power loss detected
– Test control
You can run the Analyze line test only on analog DCEs (modems). The test causes
the modems to exchange test patterns on the line. The modems measure
parameters of the analog signals. The modems report:
v Frequency shift
v Second and third harmonic distortion ratios
v Signal to noise ratio
318 Service Functions V5R2