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Summary of Contents for Patton electronics 2703-X21
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Page 1: User Manual
USER MANUAL MODEL 2703-X21 G.703/E1 Digital Modem SALES OFFICE Part# 07M2703-X21-C (301) 975-1000 Doc# 031111UC Revised 6/19/98 TECHNICAL SUPPORT C E R T I F I E D (301) 975-1007 An ISO-9001 http://www.patton.com Certified Company... - Page 2 2.048 Mbps data from a G.703 network and sends it to a router, bridge, multiplexer or other device. As an interface converter , the Model 2703-X21 accepts 120 Ohm twisted pair or 75 Ohm dual coax network connections (both types of interfaces provided).
- Page 3 (externally accessible), as well as seven jumpers (internal). These switches and jumpers allow configuration of clocking, data rate, and test options. The Model 2703-X21 is also equipped with an internal switch that allows selection of 115 or 230 VAC power inputs (Note: this switch is not present in Models 2703-X21-UI and 2703-X21-DC).
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Page 4: Internal Jumper Settings
S1-2 and S1-3: Rate Adaptation Switches S1-2 and S1-3 are set in combination to allow the Model 2703-X21 to adapt to terminal devices running at data rates of less than 2.048 Mbps (The network rate remains 2.048 Mbps regardless of the terminal rate adaptation setting). - Page 5 Figure 5. Jumper locations on Model 2703 PC board. The table below shows the factory default jumper settings. Following the table are descriptions for each jumper. JUMPER SUMMARY TABLE Jumper Function 75 ohm 120 ohm Factory Default 75 Ohm TX Shield to GND 75 Ohm RX Shield to GND Opt.* Reserved 120 Ohm Shield to GND...
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Page 6: Power Supply Options
75 ohm operation 120 ohm operation 3.3 POWER SUPPLY OPTIONS The Model 2703-X21 is available with three power supply options: The Standard power supply option (Model 2703-X21 or 2703-X21- 230) is factory configured for either 115 or 230 VAC, depending on how the product is ordered, and is available with a variety of domestic and international power cords (see Appendix C). -
Page 7: Installation
The Model 2703-X21 supports 2.048 Mbps communication over an unstructured G.703 network. Both 120 ohm twisted pair and 75 ohm coax interfaces are provided on the rear panel of the Model 2703-X21 (see Figure 6, below). Be sure the unit is configured properly to operate in either 120 ohm or 75 ohm mode, and that the network connection is grounded appropriately (see Section 3.0). -
Page 8: Operation
5.1 POWER-UP To apply power to the Model 2703-X21, first be sure that you have read Section 3.3, and that the unit has the proper voltage setting and fuse. Failure to do so could result in damage to the unit and connected equipment, and may constitute a fire hazard. - Page 9 Dimensions: 7.3” x 6.6” x 1.62” (185mm x 168mm x 41mm) Weight: 2.02 lbs. APPENDIX B MODEL 2703-X21 PIN CONFIGURATIONS CCITT X.21 INTERFACE (DB-15) 1- Frame Ground 1 FRAME GROUND Transmit - B - 9 2- Transmit - A TRANSMIT B...
- Page 10 . The DC version is supplied without power cord. All versions of the Model 2703-X21 are supplied without a terminal (DTE) interface cable. This cable may be ordered separately, or may be supplied by the user.
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