7700 MultiFrame Manual
7707DT RS-232/422/485 Fiber Data Transceiver
Page - 16
Revision
1.8
4.2.1. Card-Edge Display Warning Indications
There are flashing warning indicators that may appear on the display of the 7707DT. These warning
indications can overwrite other display text, and supersede each other by order of priority. By pressing the
pushbutton, a warning indication can be cleared from the display, and access to other menu items is
maintained. Possible warning indications are:
LASR…ERR:
Laser error - warns of laser (if equipped) end-of-life condition.
LINK…LOSS:
Optical link not established.
OK:
Optical link established, no video input or laser (if equipped) problems.
4.2.2. Displaying the Optical Power
The 7707DT can measure and display optical power over a range of –40 to 0dBm in 1dBm increments.
Please heed the maximum optical input power specification for the specific product option you possess.
Optical power monitoring is accommodated through the card-edge interface or
Vista
LINK
®
. To display the
optical power to the card-edge select the
PWR
indication in menu level 1.
PWR
-40 to +5
LOW
OVR
-40
to
+5
Optical input power in dBm units (see caution
below).
LOW
Optical input powers below –40dBm.
OVR
Optical input powers exceeding maximum (see
caution below).
CAUTION: Never exceed the maximum specified optical input power for the
specific product option that you posses. See section 3.6 for optical input
specifications. Exceeding the maximum optical input power can permanently
damage the optical receiver.
4.2.3. Selecting the Signal Status Indication Mode
The eight green LED’s (thirteen on 7707DT-GPIO) indicate the signal status of the RS-422/485, RS-232,
and LTC channels. Selectable modes accommodate signal presence indication of input data, output data,
or both. LED designations are as follows:
