Black Box ME444A-530-R3, ME444AE-R3, ME445C-X.21, ME445C-35, ME444A-R3, ME445C-530 Bert using loops

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256-KBPS LINE DRIVER (V.35, RS-530, OR X.21)

PATT

PRESSED

PATTERN XMT

GENERATOR

PATTERN

TESTER RCV

ERROR

ASM-20

Figure 6-1. BERT using loops.

PATT	DEPRESSED
PATT	(DISCONNECTS
DEPRESSED	EXTERNAL DTE)
		RCV
PATTERN	PATTERN
GENERATOR	TESTER
	ERROR	DTE
		DTE
PATTERN	PATTERN	XMT
PATTERN	PATTERN
TESTER	GENERATOR

ERROR

Figure 6-2. Two line drivers doing end-to-end BERT.

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Contents Kbps Line Driver FCC and IC RFI Statements Safety Warnings Declaration of Conformity Kbps Line Driver V.35, RS-530, or NOM Statement Trademarks Used in this Manual Contents Flow Control None SpecificationsSpecifications Physical Description IntroductionFunctional Description Line driver block diagramModulation Timing Point-to-point application ApplicationsTail-circuit application Installing the Card Version in the RackNest 2/14 ConfigurationPlacement of the Standalone Version Description of the Racknest 2/14’S Power Supply User-configurable options Configuring the Standalone or Card VersionUser-configurable options Layout of the 256-kbps Line Driver circuit board Kbps Line Driver V.35, RS-530, or Installing the Standalone Version in 19-Inch Racks InstallationInstalling a single unit in a 19-inch rack Installing two units in a 19-inch rack Installing a card in the RackNest 2/14 Installing the 256-kbps Line Driver Rackmount Card VersionRackNest 2/14 illustrated Function Installation Kbps Line Driver V.35, RS-530, or Signal ITU-TSS Lead Name Abbrev Circuit Type Rack Norm Nest PIN Pinout of the V.35 standalone’s M/34 connector DB25 DA15 Connecting Data Cables Line Connection Installation Operation Controls and IndicatorsOperation Indicators Operating ProcedureLoop Tests TroubleshootingBit-Error-Rate Tester Bert Bert using loops Local Analog Loopback Modem Self-TestLocal analog loopback Remote Digital Loopback Remote digital loopback Local Digital LoopbackLocal digital loopback Calling Black BoxShipping and Packaging 19-AWG 22-AWG 24-AWG 26-AWG Kbps Miles Appendix Maximum DistancesCopyright 2004. Black Box Corporation. All rights reserved