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To perform an RDL test, follow these steps:
1. Activate RDL. This may be done in two ways:
a. Enter Remote Loop from the System
Diagnostics/Statistics menu and toggle the <Spacebar>
until “TM” appears next to the Remote Loop option.;
b. Activate the “RL” signal on the DTE. If you are not sure
which lead is the “RL” signal, please refer to Appendix D.
2. Perform a bit error rate test (BERT) using the internal V.52
generator (as described in Section 5.3), or using a separate
BER Tester. If the BER test indicates a fault, and the Local
Line Loopback test was successful for both NetLink™s, you
may have a problem with the twisted pair line connection.
5.3 BIT ERROR RATE (V.52) DIAGNOSTICS
The Model 2094 offers three V.52 Bit Error Rate (BER) test pat-
terns. These test patterns may be invoked along with the LAL and
RDL tests to evaluate the unit(s) and the communication links.
When a 511, 2047, or QRSS test is invoked, the Model 2094 gen-
erates a pseudo-random bit pattern of 511 bits, 2047 bits or 2
20
bits,
respectively, using a mathematical polynomial. The receiving model
2904 then decodes the received bits using the same polynomial. If the
received bits match the agreed upon pseudo-random pattern, then the
Model 2094(s) and the communication link(s) are functioning properly.
511 Initiates a built-in 511 bit pseudo-random
pattern generator and detector.
2047 Initiates a built-in 2047 bit pseudo-random
pattern generator and detector.
QRSS Initiates a built-in 2
20
bit pseudo-random
pattern generator and detector.
To perform a V.52 test, follow these steps:
1. Activate the local loopback or remote loopback diagnostic.
2. Activate the test pattern. This may be done in one of two
ways:
a. Enter Selected Pattern from the System
Diagnostics/Statistics menu and toggle the <Spacebar>
until the desired test pattern appears.
b. Enter Test Pattern and toggle the <Spacebar> to
send the selected pattern.
c. One of two result codes will appear to the right of the
Test Pattern listing:
OK Indicates that the received test pattern is error-free.
BE Indicates that there are errors in the test pattern (to
deliberately insert errors in the pattern, toggle
Error Insertion to ON).
b
b
e
d
c
c