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MT-746C-SL STATUS INDICATORS
The MT-746C-SL transmitter provides the following LED status indicators to aid in installation and
troubleshooting:
DATA TX / RX INDICATORS
DATA TX and DATA RX indicators are provided to monitor the data and contact closure channels. TX1
and RX1 correspond with the multi-protocol input/output of data channel 1. TX2 and RX2 correspond
with the input/output of contact closure channel 2.
DATA TX
A green LED indicator is provided to monitor the data/contact closure coming in from the electrical
interface, through the MT-746C-SL, and out onto the fiber. The intensity of this indicator will vary with
input data patterns, however in typical data applications it will cycle on and off as data is transmitted.
For contact closure applications, this LED will be on solid when the CONTACT IN terminals are
connected together. Data/contact closure transmitted status associated with this LED is summarized
below.
DATA TX LED
Data Status
Contact Closure Status
Green
Data Flow Present
Contact In Pins Shorted
Off
Data Flow Not Detected
Contact In Pins Open
DATA RX
A green LED indicator is provided to monitor the data/contact closure coming in from the fiber, through
the MT-746C-SL, and out onto the electrical interface. The intensity of this indicator will vary with input
data patterns, however in typical data applications it will cycle on and off as data is received. For
contact closure applications, this LED will be on solid when the CONTACT OUT terminals are joined
together. Data/contact closure received status associated with this LED is summarized below.
DATA RX LED
Data Status
Contact Closure Status
Green
Data Flow Present
Contact Out Pins Shorted
Off
Data Flow Not Detected
Contact Out Pins Open
VLI 1 THROUGH VLI 4
A bi-color LED indicator is provided for each of the four video inputs to the MT-746C-SL. DC power and
video status associated with each of these LED’s are summarized below.
Video Presence LED
DC Power Status
Video Status
Green
On
Proper Input Video Present
Red
On
Input Video Not Detected
Off
Off
Check Power Supply
OLI
A bi-color LED indicator monitors the optical input power of the data signal that is being received at the
MT-746C-SL from the MR-746C or the RR-746C. DC power and optical input status associated with
this LED are summarized below.
Optical Level Indicator
DC Power Status
Optical Status
Green
On
Proper Optical Input Power Present
Red
On
Optical Input Not Detected
Off
Off
Check Power Supply
