CTI Products EXB-232 Asynchronous Serial System Extender - Manual (Page 15)

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3. EXB Module Setup
The EXB module requires minimal setup for ease of installation. This section details setup
requirements for mounting, connection, and controls.
3.1 Physical
Non-slip rubber feet are included on all EXB modules to allow them to conveniently rest on any
horizontal surface. Four 6-32 threaded holes are also available on the bottom of the module to
allow bolting of the module in any convenient orientation. WARNING: Care should be taken
to limit protrusion of the screw into the module to no more than 0.125 inch from the
module bottom surface!
Mounting kits are available as options to allow wall or rack mounting of the EXB module.
Installation details using these kits are contained in Appendix C.
3.2 Electrical Connections
3.2.1 Network Connections
The local MCN network must be attached to the EXB module via the NETWORK connector
following standard MCN guidelines as to cable type, cable length, and termination as specified in
reference 1, the MCN System Manual.
3.2.2 Power Connection
DC power must be attached to the EXB module via the DC IN connector (see Appendix B for
electrical specifications and Appendix A for connector specifications). Apply DC power to the
EXB module only after all other connections have been made. A wall plug-in style power
supply designed for the EXB module is available from CTI Products, Inc.
DC power can also be distributed over the MCN network cables. Power is distributed through
the NETWORK OUT connector to provide power to the NETWORK IN connector of the MCN
unit it is connected to. Each power supply can power up to four units total. See reference 1, the
MCN System Manual, for complete details of connections to the network and DC IN connectors.
3.2.3 EXB-TELCO Telephone Line Connection
The telephone circuit connection must be made using the LINE connector (see Appendix A for
connector type and pinout). Leased-Line connection can use either a 2 wire or 4 wire scheme to
a dedicated leased-line circuit. In 2 wire leased-line mode, the audio circuit must pass audio in
both directions simultaneously. See text in section 3.3 covering OPTION A switch position 7 for
important information when connecting two EXB-TELCO units “back-to-back” in leased line
mode with a short phone cable. Certain leased-line audio circuits (most notably microwave RF
channels) provide a 4-wire circuit made up of a Transmit pair and a Receive pair. Use the 4 wire
mode in these situations. Be sure to provide proper wiring in 4 wire mode (see Appendix A for
details).