Motorola V3229 - 14.4 Kbps Modem, Operating Instructions Manual

Page: 230 / 273

<C#>-H V.3229 / V.3229L
<Reference>
Test Procedures
Note: Local Analog Loopback, with or without test
pattern, is the only test available in protocol mode.
A diagnostic test performed during dial backup will
terminate when the modem performs leased line
lookback.
Local Analog
Loop
The local modem transmitter is connected to its
receiver so the analog signal normally sent over the
telephone line is received locally. If operating on 2-
or 4-wire private lines, the leased lines are terminated
into 600 ohms (Figure C-1). If operating 2-wire over
the PSTN, any call is terminated and the modem is
forced on hook (Figure C-2).
Note: Figure C-1 through C-8 include LED indica -
tions for diagnostic tests. These indications are valid
when DTE options are set by factory option set #1
and RTS is active from the DTE. Where indicated,
RD and / or TD may be on, off, or flashing depending
on the type of DTE and its operating state.
For 2-wire operation, Analog Bilateral Loopback is
invalid. In 4-wire operation, Analog Bilateral Loop-
back connects the receive leased line to the transmit
line through a buffer amplifier (Figure C-3).
Remote Analog
Loop