Alcatel-Lucent 1643 AMS - MDI Circuit; MDI;MDO Connector

MDI/MDO interface
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General
The four Miscellaneous Discrete Inputs (MDIs) are intended for customer usage. The
inputs can be used to collect status information from the 1643 AM/1643 AMS itself or
from other transmission or non-transmission equipment like power supply systems,
intruder detectors or fire detectors. The external remote power supply (FSP) box is
managed through this interface.
An MDI shall be considered active when resistance between external voltage source
and input is less than 100 Ω. An MDI shall be considered inactive when resistance
between external voltage source and input is more than 500 kΩ.
Floating MDIs and Non-floating MDIs
The external physical interface supports four floating MDIs and four non-floating
MDIs simultaneously. The non-floating MDIs are not connected to ground. There is
also no pin sharing between the floating MDIs and the non-floating MDIs.
An MDI is active when it is supplied by an external nominal 24 or 48 VDC voltage.
This causes current to flow through the diode part of the optocoupler and causes the
opto transistor to saturate. The saturated transistor pulls the GPIO signal to a logic “0”.
Each MDI anode and cathode of the optocoupler are connected to the 25-pins Sub-D
connector.
The MDIs can be floating and non-floating with respect to system ground. Activation
of the floating MDI requires an external voltage in the range of 18-72 V (I
max
of 4mA
by one input). The non-floating MDI (Easy MDI or EMDI) does not require an
external electric voltage. It is recommended that the non-floating MDIs (EMDIs) are
not externally grounded.
Figure 4-15 MDI circuit
+3.3V
CKT
GRD
DUAL OPTO-
DUAL OPTO-
MDI/MDO
MDI1_GPIO
MDI2_GPIO
MDI3_GPIO
MDI4_GPIO
COUPLER
COUPLER
CONNECTOR
MDI/MDO
CONNECTOR
+3.3V
13
12
11
10
24
23 22
21
+ +
+
+
System cabling
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365-312-802R7.2
Issue 4, June 2007
Alcatel-Lucent - Proprietary
See notice on first page
4-17