130
MINI-MODEM (56 KBPS DATA/FAX MODEM)
appearing on your monitor, your modem is
probably causing the problem, although it could
also be your computer. If your modem passes this
test, but you are receiving errors while on-line, the
remote modem or the phone line could be at
fault.
5.2 Digital Loopback Test/V.54 Loop 2 (Local/Manual)
The Digital Loopback Test is an on-line test that loops
data sent from one modem across the phone line to
another modem, then back to the first modem. See
Figure 4-2. There are two ways to put a modem into
Digital Loopback mode:
1. Locally or Manually, described here in
Section 5.2
.
2. Remotely or Automatically, see
Section 5.3
.
NOTE
If you wish to abort any test in progress, enter
AT&T0<cr>. All loopback tests will operate at all speeds
except 300 bps. Disable error correction (AT\N0&W0<cr>)
before using loopback tests. In this test the local modem
is placed in Digital Loopback mode. Data is entered and
transmitted from the remote modem (which is not in
digital loopback mode), sent across the phone line to the
local modem, and looped back to the remote modem.
