Patton electronic 2720/I Series user manual BIT Error Rate V.52 Diagnostics, Qrss

5.3 BIT ERROR RATE (V.52) DIAGNOSTICS

The NetLink-T1ª 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-T1ª generates a pseudo-random bit pattern of 511 bits, 2047 bits or 220 bits, respectively, using a mathematical polynomial. The receiving NetLink- T1ª 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-T1ª(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 220 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 e Selected Pattern from the System Diagnostics/Statistics menu and toggle the <Spacebar> until the desired test pattern appears.

b. Enter c Test Pattern and toggle the [Spacebar] to send the selected pattern.

c.One of two result codes will appear to the right of the c 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

dError 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:	3.5ÓL x 2.1ÓW x 0.78ÓH (9.0 x 5.3 x 1.9
	cm)
	5.0ÕÕ L x 42ÕÕ W x 1.5ÕÕ H

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