Patton electronic NetLink-E1 2715 User Manual

Page 17

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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 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

20

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

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

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