Paradyne COMSPHERE 3800PLUS User Manual page 58

COMSPHERE 3800Plus Modems
Pattern
Pattern can transmit and receive a 511 bit error rate test
pattern. It can also be used with a local analog loopback
or a remote digital loopback to simulate data passing
through the modem. For this test to operate properly, the
modems must be online and in Synchronous or
Asynchronous Direct mode. Otherwise, the message
Invalid:Bffr Mde appears when this test is started.
(See Figures 7-4 through 7-6.)
Figure 7-4. Pattern Test and Local Analog
Loopback Test
Figure 7-5. Pattern Test and Remote Digital Loopback Test
Figure 7-6. End-to-End Pattern Test
7-6 October 1998 3980-A2-GB30-40