Black Box ME445C-530, ME444AE-R3, ME445C-X.21, ME445C-35, ME444A-R3 Operating Procedure, Indicators

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

Table 5-2. The indicators.

The item numbers in this table correspond to Figures 5-1 and 5-2.

ITEM

INDICATOR

FUNCTION

 

 

 

1

PWR

Green LED is on when power is on.

 

 

 

2

RTS

Yellow LED is on when terminal activates Request to Send.

 

 

 

3

TD

Yellow LED is on when steady SPACE is being transmitted. It flickers

 

 

when data is transmitted.

 

 

 

4

RD

Yellow LED is on when steady SPACE is being received. It flickers

 

 

when data is received.

 

 

 

5

DCD

Yellow LED is on when a valid receive signal is present.

 

 

 

6

TEST

Red LED is on when the LMD-MR256 is in any of the loopback modes.

 

 

 

7

ERR

LED goes ON when PATT switch is activated and then dims. If there are

 

 

errors in the test pattern, the LED blinks or remains ON.

 

 

 

5.2 Operating Procedure

The line driver operates entirely unattended, although we recommend that you monitor its LEDs occasionally. To turn the unit off, you must unplug its power cord from the outlet—it has no power switch.

If you want to reconfigure the line driver for a different type of operation, make very sure to unplug the unit first. After the unit is powered down, change the settings of its internal controls as necessary, following the instructions in Section 3.3.

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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 Configuration Placement of the Standalone VersionInstalling the Card Version in the RackNest 2/14 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 ProcedureTroubleshooting Bit-Error-Rate Tester BertLoop Tests 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