Patton electronic 2720/I Series User Manual download pdf (Page 20)

5.3 BIT ERROR RATE (V.52) DIAGNOSTICS

The NetLink-T1™ 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 NetLink-T1™

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

bits, respectively, using a mathematical polynomial. The receiving

NetLink- T1™ then decodes the received bits using the same polyno-

mial. If the received bits match the agreed upon pseudo-random pat-

tern, then the NetLink-T1™(s) and the communication link(s) are func-

tioning 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:

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).

APPENDIX A

PATTON NETLINK-T1 MODEL 2720

SPECIFICATIONS

WAN Speed: 1.544 Mbps

WAN Connection: RJ-48C

Nominal Impedance: 100 Ohms

DTE Interface: EIA-530, ITU/T V.35, M/34 female, or

EIA-530, DB25 female

Line Coding: AMI/B8ZS

Line Framing D4/ESF/Unframed

Receive LBO: Automatic

Transmit LBO: Selectable - 0, 7.5,

15, or 22.5 dB, plus DSX-1

Clock Options: Internal, external or network clock

Diagnostics: Responds to CO-initiated D4 loopup

and loopdown codes, ESF line loop

and payload loop FDL messages,

Universal Loopback De-activate mes-

sage

Standards: AT&T TR62411, TR54016, ANSI T1.403

Power Supply: 120VAC, 60 Hz to 5VDC 300mA wall-

mount transformer or UI 100-240VAC,

50-60 Hz to 5 VDC, 2A desktop trans-

former

Dimensions: 3.5”L x 2.1”W x 0.78”H (9.0 x 5.3 x 1.9

cm)

5.0’’ L x 42’’ W x 1.5’’ H

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