Filter
Top Products
1001MC test mode diagnostics 283
Model 1001MC Operations Guide 11 • Troubleshooting and maintenance
bits match the agreed aupon pseudo-random pattern, then the NetLink modems and the communication
link are functioning properly.
• five11er (511 with errors)—After successfully concluding a five11 test, use the five11er test (which ran-
domly adds errors to the 511 bit pattern to verify that the receiving modem detects the errors.
• lal (local loopback)—The local loopback test checks the operation of the local NetLink modem. Any data
sent to the local NetLink modem in this test mode will be echoed (returned) back to the originating device
(i.e., characters typed on the keyboard of a terminal will appear on the terminal screen) (see figure 144).
Figure 144. Local loopback diagram
• lalWith511 (local loopback with 511)—This test functions the same way as the lal test, but it adds a 511
pattern from the BER generator.
• lalWith511er (local loopback with 511 and errors)—This test functions the same way as the lalWith511
test, but it adds a 511 pattern from the BER generator that includes errors to verify that the modems can
detect the errors.
• rdl (remote loopback)—The remote loopback test checks the performance of the local and remote NetLink
modems. Any data sent to the remote NetLink modem in this test mode will be echoed (returned) back to
the originating device (i.e., characters typed on the keyboard of a terminal will appear on the terminal
screen) (see figure 145).
Figure 145. Remote loopback diagram
• rdlWith511 (remote loopback with 511)—This test functions the same way as the rdl test, but it adds a
511 pattern from the BER generator.