Micro-Aide LDM-1 Manual de usuario descargar pdf (Pagina 28)

LDM User Manual

TEST MODE A - ANALOG TEST WITH DIGITAL LOOP BACK

In Test Mode A the analog signal present at the receive channel is decoded

into a digital data signal. The receive data signal is then presented to the

modem’s transmitter section. The transmitter outputs the decoded data via

the transmit channel. In Test Mode A the Tst2 and Tst1 LEDs will be on and

off, respectively. The DTE interface is disabled in this test mode. The CD

indicator will operate normally. The RTS and CTS indicators will illuminate in

accordance with the DTE status. Neither signal, however, has an effect on

Test Mode A. The Rcv and Xmt indicators will be off.

Test Mode A can be used to perform an effective end-to-end test of a net-

work segment. The modem at the end of the segment under test should be

placed in Test Mode A. All other modems should be left in Normal Mode.

Transmitted data will be returned to the source modem’s receiver where it can

be checked against the originally transmitted data.

EST MODE B - ANALOG LOOP BACK WITH DTE DATA

Test Mode B loops the analog output signal of the transmit channel to the

input of the receive channel. The data to be transmitted is provided by the

DTE. The transmit and receive channels are left terminated but are discon-

nected from the test data (i.e., test data is not sent to the network). In Test

Mode B the Tst2 and Tst1 LEDs will be off and on, respectively. The CD

indicator will be off. The RTS and CTS indicators will be either on or off

depending upon the status of the DTE. The Rcv and Xmt indicators will illu-

minate when data is being received and transmitted, respectively. The RTS sig-

nal does not need to be asserted in this test mode.

Test Mode B is useful in checking major elements of the modem and DTE

interface.

TIP: Test Mode A requires the same equalization setting as Normal Mode.

TIP: Test Mode B requires an equalization setting of 1 (i.e., minimum).

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Micro-Aide LDM-1 Manual de usuario Pagina 28