4.2 CONNECTION TO THE TERMINAL DEVICE
The Model 2703 is wired as a DCE, and–when configured proper-
ly–supports communication with a wide variety of terminal (DTE)
devices. Compatible interface standards include EIA-530 (RS-422),
CCITT X.21 and CCITT V.35.
All interfaces are supported on a female UD-26 connector (a sub-
miniature 26-pin “D” connector designated the “alt A” in the EIA-232
Standard). The various physical/electrical connections mentioned
above are achieved by changing the Model 2703’s DIP switch settings
and attaching different adapter cables.
If you wish to construct your own terminal adapter cable, please
consult the pinout diagram in Appendix B. If you wish to purchase a
terminal adapter cable specifically designed to work with the Model
2703, please refer to the specific Patton part numbers listed in
Appendix C.
4.3 CONNECTION TO THE POWER SOURCE
As described in Section 3.3, the Model 2703 is available with three
power supply options: two AC and one DC. The two AC power supply
options (Standard and Universal) use a female IEC power cord inter-
face, for which Patton can supply various domestic and international
power cords. Please refer to Appendix C for specific Patton part num-
bers when ordering power cords. The DC power supply option uses a
3-pin terminal strip interface (Note: Please refer to the Model 2703
Service Manual for DC power supply wiring instructions).
13
5.0 OPERATION
Once the Model 2703 is properly configured and installed, it
should operate transparently. This sections describes power-up, read-
ing the LED status monitors, and using the built-in loopback test
modes.
5.1 POWER-UP
To apply power to the Model 2703, 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.
Having checked the volt-
age setting, plug the AC power cord into both the Model 2703 and the
AC outlet. Then Power-up the unit using the rear Power switch. Note:
the “Power” LED should glow when power is applied to the unit.
5.2 LED STATUS INDICATORS
The Model 2703 features four front panel LEDs that indicate the
status of power, network connection, master clock and loopback test.
Figure 6 (below) shows the front panel location of each LED.
Following Figure 6 is a description of each LED’s function.
Power
Glows red when the Model 2703 is powered up.
Network
Glows green when the Model 2703 is receiving
correctly encoded data from the line interface
equipment.
Master Clock Glows green when the Model 2703 is
configured as the master clock unit.
Loop
Glows green when the Model 2703 is in
loopback mode.
14
Figure 6. Model 2703 Front Panel