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Summary of Contents for Black Box ME759C-RJ45
- Page 1 ME759C-RJ45 Line: RJ-45 INTERFACE MODULE (REAR CARD) Serial: 10-Pin RJ This switch is on the bottom side of card RJ-45 CONN. INTERFACE MODULE (REAR CARD) 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8...
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Page 2: Specifications
SPECIFICATIONS: INTRODUCTION: Hardware Required: Cards can be installed only in MicroRacks (RM202, RM204, RM208 and RM216) The Multi-Function LD Card is a short-range modem on a dual rack card (it has a main [front] module and an interface [rear] module). The Card operates across two wires (half-duplex) or four wires (full- or half-duplex), Cable Required: For modem-to-modem line: Two- or four-wire unconditioned twisted-pair, 19 to 26 AWG communicating synchronously or asynchronously, up to a maximum range of 20 miles (32.2 km). - Page 3 S1 Positions 1 through 4: Data-Rate Setting determines the data rate (valid for both synchronous and asynchronous protocols) of the Multi-Function LD Card. S1-1 S1-2 S1-3 S1-4 Setting: 1200 bps 1800 bps 2400 bps 3600 bps 4800 bps 7200 bps 9600 bps (default) 14.4 Kbps 19.2 Kbps...
- Page 4 S2 Position 2: 2-Wire vs. 4-Wire Operation, determines whether the Multi-Function LD Card operates in 2-wire or 4-wire mode. S2-2 Operation: 4-Wire (full- or half-duplex) (default) 2-Wire (half-duplex only) S2 Position 3: V.52 and V.54 Diagnostic Testing. To reset the V.54 circuit, turn switch S2 position 3 ON, then back OFF. S2-3 Test Mode: Normal Operation (default)
- Page 5 S3-1 and S3-2: Input Impedance, determines the Multi-Function LD Card's input impedance. Choose the optimum impedance setting for your application. In long-distance applications, the impedance of the cable must match the impedance of the load (or resistor) of the Multi-Function LD Card: Thicker-gauge cables require a lower ohm setting, while thinner-gauge cables require a higher ohm setting. Also, higher data rates call for a lower ohm setting, and lower data rates dictate a higher ohm setting. The table below lists our recommendations for setting this switch.
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Page 6: Installation
Serial Interface: DTE Shield (Pin 1) Connection to Frame Ground (JB3) This jumper applies to the serial interface. In position 1 and 2, this jumper links the Protective Ground (PGND) or "DTE Shield" lead (DB25 Pin 1 or 10-pin RJ Pins 1 and 10) of the RS-232 line to the interface module's frame ground (FGND). When this jumper is in positions 2 and 3, the RS-232 Protective Ground on DB25 Pin 1 or RJ-45 Pins 1 and 10 is disconnected ("lifted") from frame ground. -
Page 7: Operation And Diagnostics
Cards, you can get a custom cable from Black Box as a special quote, or you can use regular straight-through pinned cable and repin one of the RJ connectors (that is, rearrange the wiring connections between the terminal block and the actual contacts). - Page 8 The Power Indicator: The green Power LED lights to indicate that the Card is receiving power. The Test Indicator: The green Test LED lights to indicate that V.52 or V.54 tests are running. The Error Indicator: The red Error LED has three functions: A.
- Page 9 The Multi-Function LD Card has been performance-tested using twisted-pair cable with these characteristics: Wire Gauge Capacitance Resistance 19 AWG 83 nf/mi. or 15.72 pf/ft. 16.3 ohm/1000 ft. (53.5 ohm/km) 22 AWG 83 nf/mi. or 15.72 pf/ft. 32.6 ohm/1000 ft. (107 ohm/km) 24 AWG 83 nf/mi.
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