5.3 BIT ERROR RATE (V.52) DIAGNOSTICS
The NetLink-T1™ offers three V.52 Bit Error Rate (BER) test patterns. 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
20
bits, respectively, using a mathematical polynomial. The receiving
NetLink- T1™ then decodes the received bits using the same polynomial. If the received bits match the agreed upon pseudo-random pattern, then the NetLink-T1™(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).
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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 message
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 transformer
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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