Patton electronic X.21 Interfaces - Manual (Page 14)

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5.0 OPERATION
When the Model 2707 has been properly configured and installed, it
should operate transparently. This sections describes power-up, LED
status monitors, and the built-in loopback test modes.
5.1 POWER-UP
Before applying power to the Model 2707, please read section 4.3,
“Power Connection” on page 11 and ensure that the unit is properly
connected to the appropriate power source.
5.2 LED STATUS MONITORS
The Model 2707 features six front panel LEDs that monitor connections
on the G.703 and signaling, error and test modes. Figure 6 shows the
front panel location of each LED. Descriptions of each LED follow Figure
6.
Figure 6. 2707 Front Panel
E1 Link (Active Green) Solid green (On) indicates that
the end to end E1 Link is up, signifying that the
link is active. The E1 Link LED is Off when the
link is down.
TD & RD Glows yellow to indicate an idle condition of
Binary “1” data on the respective terminal inter-
face signals. Green indicates Binary “0” data.
TM (Active Yellow) Solid Yellow indicates an
Active Test Mode. The unit may be placed
in test mode by the local user.