ME778C-RJ11 P river M Mini D Card 1 C-RJ 1 ME778 ODULE MAIN M Line: RJ-11 Line: RJ-11 Power INTERFACE MODULE (REAR CARD) -TD Unit A -R D -C D Serial: 10-Pin RJ -TD Unit B -R D -C D LO Z A HI Z LO Z B HI Z Serial: 10-Pin RJ 1 2 3 1 2 3 JB2 2W A 4W 2W B 4W 1 2 3 INTERFACE MODULE (REAR CARD) MODEM A Modem-toModem Line JB4 1 2 3 ON ON MODEM B 1 2 3 4 SW B 1 2 3 4 SW A JB6 MODEM A 1 2 3 MAIN MODULE (FRONT CARD) RS-232 Serial Line JB7 JB5 1 2 3 1 2 3 MODEM B
SPECIFICATIONS: Hardware Required: Cards can be installed only in MicroRacks (RM202, RM204, RM208 and RM216) Cable Required: For modem-to-modem line: Four-wire unconditioned twisted-pair, 19 to 26 AWG Interfaces: Serial: EIA/TIA-561 (compatible with EIA RS-232 and ITU-TSS [CCITT] V.24); Line: Two- or four-wire telco; Internal: Card-edge for module--MicroRack interconnection. Protocol: Asynchronous. Data Format: Transparent to numbers of data bits and stop bits and types of parity.
CONFIGURATION: Setting the Configuration Jumpers and Switches: The Mini Driver MP card has two different sets of configuration controls. One set is on the main (front) module. The other set is on the interface (rear) module. The Jumpers and Switches on the Main Module: The Mini Driver MP card has two jumpers and four switches on its main (front) module-- a jumper and two switches for each modem as shown on the first page. With jumpers JP1 and JP2, you can control receiver impedance.
S1 Position 4 (Unit A) and S3 Position 4 (Unit B): Receiver Squelch determines whether the corresponding modem's receiver is always on or is squelched by RTS. If receiver squelch is enabled and RTS is high, the receiver will be squelched and RD and CD will be held low. This feature is useful for 2-wire operation, because the receiver and transmitter are connected to the same pair of wires. (For 4-wire operation, both switches should be set to OFF--this is the factory default).
Line Interface: Line A Shield and Line B Shield (JB2 and JB4) These jumpers apply to the line interface. When one of these jumpers is in positions 1 and 2, it links RJ-11Pins 1 and 6 on the corresponding line to the interface module's frame ground. (If you are using shielded twisted-pair cable, the shield can be connected to these pins). In positions 2 and 3, Pins 1 and 6 remain connected to each other, but are disconnected ("lifted") from frame ground.
REPLACING THE POWER SUPPLY'S FUSE: The MicroRack's power supply uses a 400-mA fuse for 120-VAC circuits, and a 200-mA fuse for 240-VAC circuits. The fuse compartment is located just below the AC socket on the power supply's rear module. To replace the fuse, follow these steps: 1. Making sure the rack is turned off and unplugged, use a small screw-driver to pop the compartment open: It will slide open like a drawer. 2.
The Modem-to-Modem Line Cables and Connectors: The Mini Driver MP Card's line ports are always the upper two ports on its interface module. They are 6-pin RJ-11 connectors, pinned for a standard telco-wiring environment, as shown below. The Mini Driver MP Card operates full duplex over four wires (two twisted pairs). In all applications, the twisted-pair wire must be 26 AWG or thicker, unconditioned, dry, and metallic. Both shielded and unshielded cable yield favorable results.
Point-to-Point Application XMT+ XMTRCV+ RCV- RCV+ RCVXMT+ XMT- Point-to-Multipoint Application XMT+ XMTRCV+ RCV- RCV+ RCVXMT+ XMT- RCV+ RCVXMT+ XMT- RCV+ RCVXMT+ XMT-
