Patton electronic 2701/B, 2701/C Connecting to a DCE Device, Configuring the X.21 Interface 2701/D

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Connecting to a “DCE” Device

If the Model 2701 serial interface is hard-wired as a DCE (all except the X.21 version), you must use a null modem cable when connecting to a modem, multiplexer or other DCE device. This cable should be of the shortest possible length—we recommend 6 feet or less.

Configuring the X.21 Interface (2701/D)

The serial port on the X.21 interface is default wired as a DCE, but may be switched to a DTE. This is done by reversing the orientation of the DCE/DTE strap, as described below:

To reverse DCE/DTE orientation, remove the top case. Refer to section “Opening the Case” on page 13

The DCE/DTE strap is located near the DB15 connector on the top side of the board. The arrows on the top of the strap indicate the configuration of the X.21 port (for example, if the DCE arrows are pointing toward the DB-15 connector, the X.21 port is wired as a DCE). Reverse the DCE/ DTE orientation by pulling the strap out of its socket, rotating it 180º, then plugging the strap back into the socket. You will see that the DCE/DTE arrows now point in the opposite directions, showing the new configura- tion of the X.21 port.

Note If the 2701/D is configured as a DTE, the clocking mode must be set for external clock.

4.3 POWER CONNECTION

Universal AC Power (100–240 VAC)

The Model 2701 uses a 5VDC, 2A universal input 100–240 VAC, power supply (center pin is +5V). The universal input power supply has a male IEC-320 power entry connector. This power supply connects to the Model 2701 by means of a barrel jack on the rear panel. Many interna- tional power cords are available for the universal power supply.

The Model 2701 powers up as soon as it is plugged into an AC outlet-- there is no power switch.

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Contents User Manual Contents Page Warranty Information Radio and TV InterferenceCE Notice Tel +1 301 Email support@patton.com ServiceFeatures General InformationDescription DIP Switch Configuration ConfigurationSwitch SW1-1 through SW1-5 SW1 SW2 SW3 SW4 SW5Speed SW1-6 and SW1-7 Clock Modes SW1-6 SW1-7 Clock ModeSwitch SW2-1 Line Coding HDB3 default SW1-8 Enable/Disable Loop Tests from DTES1-8 Setting Position Function Factory Default Selected OptionSW2-3 Option Switch SW2-2 CRC-4 MultiframeSwitch SW2-3 Data Inversion SW2-2 OptionS2-4 RDL Type Switch SW2-4 Remote Digital Loopback TypeSwitch SW2-5 Front Panel Switches Switch SW2-6 V.54 Response Disabled defaultOpening the Case InstallationConnecting to the G.703 Network Connecting the Twisted Pair 120 ohm to the G.703 NetworkConnecting to a DTE Device Connecting the Serial PortConfiguring the X.21 Interface 2701/D Connecting to a DCE DevicePower Connection Universal AC Power 100-240 VACTact Patton Electronics Technical support at DC PowerThere are no user-serviceable parts Power supply section of the Model 2701. ConTD & RD POWER-UPOperation LED Status MonitorsOperating Local Loopback LL Loop V.54 & Telco DiagnosticsRemote Loop in a Network Extension Application Operating Remote Digital Loopback RLCSU Loop Using the V.52 BER Test Pattern GeneratorNominal Impedance Network ConnectorAppendix a Network Data RateHumidity Power SupplyTemperature DimensionsAppendix B Page Appendix C Interface 34F Female Connector DCE Configuration Pin # SignalPage Appendix D Patton Model # Description Appendix E
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