Patton electronic NetLink-E1 2715 User Manual

Page 17

To perform an RDL test, follow these steps:

Activate RDL. This may be done in two ways:

Enter Remote Loop from the System
Diagnostics/Statistics menu and toggle the
until “TM” appears next to the

Remote Loop option.;

Activate the “RL” signal on the DTE. If you are not sure
which lead is the “RL” signal, please refer to Appendix D.

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 2715 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 2715 gen-

erates a pseudo-random bit pattern of 511 bits, 2047 bits or 2

bits,

respectively, using a mathematical polynomial. The receiving NetLink-
E1™ then decodes the received bits using the same polynomial. If the
received bits match the agreed upon pseudo-random pattern, then the
Model 2715(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

bit pseudo-random

pattern generator and detector.

To perform a V.52 test, follow these steps:

Activate the local loopback or remote loopback diagnostic.

Activate the test pattern. This may be done in one of two
ways:

Enter Selected Pattern from the System
Diagnostics/Statistics menu and toggle the
until the desired test pattern appears.

Enter Test Pattern and toggle the to
send the selected pattern.

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).