DataComm V.34 PL, Руководство по эксплуатации

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Tests End-to-End Self-Test
060R115-000 DataComm V.34 PL Modem 4-9
Issue 1 Installation and Operation
End-to-End Self-Test
End-to-End Self Test, illustrated below, requires operators at both the local and remote modem. It
can be commanded from the front panels. The commands can only be entered after the call is
established and both ends are in the data mode. The test causes each modem to generate a pattern
and to transmit it to the other modem. The modem receiving the pattern checks it for errors. The
patterns are made up of alternate ones and zeros for 2400 bps. For all other speeds the modems
generate a 511 test pattern. The number of errors received is displayed on the screen. This test
checks the operation of both modems and the communications line.
Table 4-6 End-to-Tend Self-Test
Step Front Panel
1. To start the test press ST.
2. The modem flashes the TM LED and
displays the test name (ST) while it is setting
up the test, then lights the TM LED and
displays four digits of the error count (0000
to 9999) while the test is running. It indicates
larger numbers by lighting decimal point one
and displaying the four least significant digits
of the actual count (for example, the actual
error count is 12345, but the modem
displays 2.345).
3. To end the test, press AL, RDL, or DL.
Modem
transmitter
DTE
Communications
line
DTE
LOCAL MODEM REMOTE MODEM
Modem
receiver
Modem
receiver
Modem
transmitter
Self-test pattern receiver
Self-test pattern generator
For self-test (end-to-end self-test), both the local and remote DTEs or terminals are
disconnected from their modems.
Self-test pattern generator
Self-test pattern receiver
V.34 PL
TR SD RD MR RS CS CO GD TM ALM OH
AL ST RDL DL SEL RST
ADV
1. To start the test, press ST.
2. TM flashes and the LCD displays the test name (ST) while it is setting up the test,
then TM lights and the LCD displays four digits of the error count (0000 to 9999) while
the test is running.
3. When the timer (S-Register 18) times out, the test expires.
4. To end the test, press AL, RDL or DL.