Alcatel-Lucent Data Multiplexer Explore 1665, Installation Manual

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Office alarm cable installation Equipment and cable installation for 1665 Data Multiplexer
(1665 DMX)
1 - 7 8
365-372-304R7.1
Issue 1, November 2007
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Office alarm cable installation
Description
Office alarms are the common method used in a central office for maintenance personnel
to quickly isolate a failure. Perform this procedure if connection to the office alarm system
is required.
Important!
The office alarm relay contacts are rated at 50 VA which means that they
are capable of switching 1 amp at 50 volts, or 2 amps at 25 volts. Their ability to
switch large transient currents means that they can, if necessary, switch up to ten
5-watt aisle pilot lamps.
If transient voltages or currents are above these limits, transient noise-suppressing devices
such as diodes or contact protection networks must be used to keep within the voltage and
current limits. If these protection devices are not sufficient, an external buffer relay MUST
be provided.
In all cases, and as a matter of good practice, suppression devices such as diodes or contact
protection networks must be provided across any external relay coil being driven by the
1665 DMX High-Capacity shelf to limit transient voltages and currents.
Office alarm cable assemblies are listed in Table 1-20, “Office alarm cable assemblies”
(p. 1-82) .
Alarm Mult
Office alarm cabling in a 1665 DMX High-Capacity shelf bay starts at the bottom shelf
which is cabled directly to the office alarm system. Then as shelves are added to the bay,
the office alarm connection is extended by multing the alarm cabling from shelf to shelf
(bottom to top). Alarm mults do not leave the bay.
For example, J12 of one shelf should be connected to the office alarm terminal. J13 of the
same shelf should be connected to J12 of the next 1665 DMX High-Capacity shelf and the
same procedure should be continued to connect more shelves.