Mdi Implementation - Alcatel-Lucent 1643 AMS Installation Manual

System cabling
Figure 4-16 MDI implementation
The four Miscellaneous Discrete Outputs (MDOs) can be used to drive signalling
devices or to influence the behavior of equipment external to the system. Each GPIO
for the MDO interfaces with a relay driver which controls a mechanical relay. All
MDOs have their common, normally closed (NC) and normally open (NO) contacts
brought to the Sub-D connector. Normally it is the non-energized state of the relay
which is shown in the figures. When GPIO becomes active, the relay is energized and
the MDO output is activated.
The MDOs shall float with respect to system ground.
An active MDO shall behave as a voltage free resistance of less than 10 Ω between the
output connection and its associated return. It shall be capable of carrying currents of
not more than 0.5 A. An inactive MDO shall behave as a voltage free resistance of
more than 500 kΩ between the output connection and its associated return. It shall be
capable of withstanding voltages of not more than 72 VDC.
The MDO contacts shall be capable of sustaining the product of above mentioned
current and voltage during transitions.
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4-18 Alcatel-Lucent - Proprietary
See notice on first page
MDI/MDO interface
365-312-802R7.2
Issue 4, June 2007