Patton electronics NetLink 2707C User Manual

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Patton electronics NetLink 2707C User Manual Manual pdf 11 page image

10Connecting the Twisted Pair (120 Ohm) to the G.703 NetworkThe Model 2707 is equipped with a single RJ-48C jack for connections toa 120 Ohm twisted pair G.703 network interface. If your G.703 networkterminates via RJ-48C, use Figure 4 below to connect the 120 OhmG.703 network channel.Figure 4. G.703 120 Ohm Connection4.2 CONNECTING THE SERIAL PORTThe Model 2707/C and D supports V.35, X.21 serial port connections.This section describes how to connect the serial ports to your terminalequipment.Connecting to a “DTE” DeviceThe serial port on the 2707/C (V.35 version) is hard-wired as a DCE.Therefore these modules “want” to plug into a DTE such as a terminal,PC or host. When making the connection to your DTE device, use astraight through cable of the shortest possible length—we recommend6 feet or less. When purchasing or constructing an interface cable,please refer to the pin diagrams in Appendix C as a guide.Connecting to a “DCE” DeviceIf the Model 2707 serial interface is hard-wired as a DCE (all except theX.21 version), you must use a null modem cable when connecting to amodem, multiplexer or other DCE device. This cable should be of theshortest possible length—we recommend 6 feet or less.Configuring the X.21 Interface (2707/D)The serial port on the X.21 interface is default wired as a DCE, but maybe switched to a DTE. This is done by reversing the orientation of theDCE/DTE strap, as described below:To reverse DCE/DTE orientation, remove the top case. Refer to “Open-ing the Case” on page 9.