MINI-LINKEandEMicro
3.10.2 Functional Description
3.10.2.1 EAC Port
The External Alar m Channel (EAC) ports are used for connecting the alarm
and control infor mation to and from other access modules or MINI-LINK C
or M kII terminals at the same site, when building MINI-LINK operation and
maintenance networks.
3.10.2.2 User In/Out
At the User Input ports, the user’s alarms are connected to the MINI-LINK
operation and maintenance network.
The User Output ports are used for control of the user’s functions through the
MINI-LINK operation and m aintenance network. The User Output por ts can
also be set to connect summary alarms from the access module to t he users’
super vision system. See Section 6 on page 93 and Section 8.6.1 on page
147 for details.
3.10.2.3 Control and Supervision
A microprocessor based Control and Supervision System (CSS) is built into
all units in the access module. Its main functions are to collect alarms, control
settings and tests. Failure is indicated on LEDs on the fronts of the units.
The SAU processor communicates with other processors in the access
module through the Node Communication Channel (NCC ). The processor also
communicates with a PC through the Operat ion and Maintenance interface.
The SAU processor controls the user input/output ports and service channel
routing. The SAU processor communicates with other MINI-LINK sites through
the External Alarm Channel (EAC) or the Remote Alar m C hannel (RAC).
See Section 6.1.2 on page 95 for details on the communication channels.
3.10.2.4 DC/DC Converter
The DC/D C converter in the SAU i s powered from the MMUs in the access
module. It produces secondary voltages for the SAU circuitry.
3.10.2.5 Digital Service Channels (Exp 1 and Exp 2 only)
The digital service channels provide extra data channels over the hop. For
example, they can be used for obtaining surveillance data from equipment not
installed in the AMM. The service channels are available on the front of the
SAU and are interconnected to the MMU through the backplane of the access
module, without any cabling.
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AE/LZT 110 2012 R8C 2002- 03-04
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